1207 lines
32 KiB
C
1207 lines
32 KiB
C
/*-
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* Copyright (c) 2010 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Edward Tomasz Napierala under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_sched.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/eventhandler.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/loginclass.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/racct.h>
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#include <sys/resourcevar.h>
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#include <sys/sbuf.h>
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#include <sys/sched.h>
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#include <sys/sdt.h>
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#include <sys/smp.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/sysproto.h>
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#include <sys/umtx.h>
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#include <machine/smp.h>
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#ifdef RCTL
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#include <sys/rctl.h>
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#endif
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#ifdef RACCT
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FEATURE(racct, "Resource Accounting");
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/*
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* Do not block processes that have their %cpu usage <= pcpu_threshold.
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*/
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static int pcpu_threshold = 1;
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SYSCTL_NODE(_kern, OID_AUTO, racct, CTLFLAG_RW, 0, "Resource Accounting");
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SYSCTL_UINT(_kern_racct, OID_AUTO, pcpu_threshold, CTLFLAG_RW, &pcpu_threshold,
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0, "Processes with higher %cpu usage than this value can be throttled.");
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/*
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* How many seconds it takes to use the scheduler %cpu calculations. When a
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* process starts, we compute its %cpu usage by dividing its runtime by the
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* process wall clock time. After RACCT_PCPU_SECS pass, we use the value
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* provided by the scheduler.
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*/
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#define RACCT_PCPU_SECS 3
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static struct mtx racct_lock;
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MTX_SYSINIT(racct_lock, &racct_lock, "racct lock", MTX_DEF);
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static uma_zone_t racct_zone;
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static void racct_sub_racct(struct racct *dest, const struct racct *src);
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static void racct_sub_cred_locked(struct ucred *cred, int resource,
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uint64_t amount);
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static void racct_add_cred_locked(struct ucred *cred, int resource,
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uint64_t amount);
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SDT_PROVIDER_DEFINE(racct);
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SDT_PROBE_DEFINE3(racct, kernel, rusage, add, "struct proc *", "int",
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"uint64_t");
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SDT_PROBE_DEFINE3(racct, kernel, rusage, add__failure,
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"struct proc *", "int", "uint64_t");
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SDT_PROBE_DEFINE3(racct, kernel, rusage, add__cred, "struct ucred *",
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"int", "uint64_t");
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SDT_PROBE_DEFINE3(racct, kernel, rusage, add__force, "struct proc *",
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"int", "uint64_t");
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SDT_PROBE_DEFINE3(racct, kernel, rusage, set, "struct proc *", "int",
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"uint64_t");
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SDT_PROBE_DEFINE3(racct, kernel, rusage, set__failure,
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"struct proc *", "int", "uint64_t");
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SDT_PROBE_DEFINE3(racct, kernel, rusage, sub, "struct proc *", "int",
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"uint64_t");
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SDT_PROBE_DEFINE3(racct, kernel, rusage, sub__cred, "struct ucred *",
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"int", "uint64_t");
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SDT_PROBE_DEFINE1(racct, kernel, racct, create, "struct racct *");
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SDT_PROBE_DEFINE1(racct, kernel, racct, destroy, "struct racct *");
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SDT_PROBE_DEFINE2(racct, kernel, racct, join, "struct racct *",
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"struct racct *");
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SDT_PROBE_DEFINE2(racct, kernel, racct, join__failure,
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"struct racct *", "struct racct *");
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SDT_PROBE_DEFINE2(racct, kernel, racct, leave, "struct racct *",
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"struct racct *");
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int racct_types[] = {
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[RACCT_CPU] =
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RACCT_IN_MILLIONS,
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[RACCT_DATA] =
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RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
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[RACCT_STACK] =
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RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
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[RACCT_CORE] =
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RACCT_DENIABLE,
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[RACCT_RSS] =
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RACCT_RECLAIMABLE,
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[RACCT_MEMLOCK] =
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RACCT_RECLAIMABLE | RACCT_DENIABLE,
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[RACCT_NPROC] =
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RACCT_RECLAIMABLE | RACCT_DENIABLE,
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[RACCT_NOFILE] =
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RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
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[RACCT_VMEM] =
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RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
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[RACCT_NPTS] =
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RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
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[RACCT_SWAP] =
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RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
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[RACCT_NTHR] =
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RACCT_RECLAIMABLE | RACCT_DENIABLE,
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[RACCT_MSGQQUEUED] =
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RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
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[RACCT_MSGQSIZE] =
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RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
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[RACCT_NMSGQ] =
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RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
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[RACCT_NSEM] =
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RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
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[RACCT_NSEMOP] =
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RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
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[RACCT_NSHM] =
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RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
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[RACCT_SHMSIZE] =
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RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
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[RACCT_WALLCLOCK] =
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RACCT_IN_MILLIONS,
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[RACCT_PCTCPU] =
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RACCT_DECAYING | RACCT_DENIABLE | RACCT_IN_MILLIONS };
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static const fixpt_t RACCT_DECAY_FACTOR = 0.3 * FSCALE;
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#ifdef SCHED_4BSD
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/*
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* Contains intermediate values for %cpu calculations to avoid using floating
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* point in the kernel.
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* ccpu_exp[k] = FSCALE * (ccpu/FSCALE)^k = FSCALE * exp(-k/20)
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* It is needed only for the 4BSD scheduler, because in ULE, the ccpu equals to
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* zero so the calculations are more straightforward.
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*/
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fixpt_t ccpu_exp[] = {
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[0] = FSCALE * 1,
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[1] = FSCALE * 0.95122942450071400909,
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[2] = FSCALE * 0.90483741803595957316,
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[3] = FSCALE * 0.86070797642505780722,
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[4] = FSCALE * 0.81873075307798185866,
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[5] = FSCALE * 0.77880078307140486824,
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[6] = FSCALE * 0.74081822068171786606,
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[7] = FSCALE * 0.70468808971871343435,
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[8] = FSCALE * 0.67032004603563930074,
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[9] = FSCALE * 0.63762815162177329314,
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[10] = FSCALE * 0.60653065971263342360,
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[11] = FSCALE * 0.57694981038048669531,
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[12] = FSCALE * 0.54881163609402643262,
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[13] = FSCALE * 0.52204577676101604789,
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[14] = FSCALE * 0.49658530379140951470,
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[15] = FSCALE * 0.47236655274101470713,
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[16] = FSCALE * 0.44932896411722159143,
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[17] = FSCALE * 0.42741493194872666992,
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[18] = FSCALE * 0.40656965974059911188,
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[19] = FSCALE * 0.38674102345450120691,
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[20] = FSCALE * 0.36787944117144232159,
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[21] = FSCALE * 0.34993774911115535467,
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[22] = FSCALE * 0.33287108369807955328,
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[23] = FSCALE * 0.31663676937905321821,
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[24] = FSCALE * 0.30119421191220209664,
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[25] = FSCALE * 0.28650479686019010032,
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[26] = FSCALE * 0.27253179303401260312,
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[27] = FSCALE * 0.25924026064589150757,
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[28] = FSCALE * 0.24659696394160647693,
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[29] = FSCALE * 0.23457028809379765313,
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[30] = FSCALE * 0.22313016014842982893,
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[31] = FSCALE * 0.21224797382674305771,
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[32] = FSCALE * 0.20189651799465540848,
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[33] = FSCALE * 0.19204990862075411423,
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[34] = FSCALE * 0.18268352405273465022,
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[35] = FSCALE * 0.17377394345044512668,
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[36] = FSCALE * 0.16529888822158653829,
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[37] = FSCALE * 0.15723716631362761621,
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[38] = FSCALE * 0.14956861922263505264,
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[39] = FSCALE * 0.14227407158651357185,
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[40] = FSCALE * 0.13533528323661269189,
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[41] = FSCALE * 0.12873490358780421886,
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[42] = FSCALE * 0.12245642825298191021,
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[43] = FSCALE * 0.11648415777349695786,
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[44] = FSCALE * 0.11080315836233388333,
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[45] = FSCALE * 0.10539922456186433678,
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[46] = FSCALE * 0.10025884372280373372,
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[47] = FSCALE * 0.09536916221554961888,
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[48] = FSCALE * 0.09071795328941250337,
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[49] = FSCALE * 0.08629358649937051097,
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[50] = FSCALE * 0.08208499862389879516,
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[51] = FSCALE * 0.07808166600115315231,
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[52] = FSCALE * 0.07427357821433388042,
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[53] = FSCALE * 0.07065121306042958674,
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[54] = FSCALE * 0.06720551273974976512,
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[55] = FSCALE * 0.06392786120670757270,
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[56] = FSCALE * 0.06081006262521796499,
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[57] = FSCALE * 0.05784432087483846296,
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[58] = FSCALE * 0.05502322005640722902,
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[59] = FSCALE * 0.05233970594843239308,
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[60] = FSCALE * 0.04978706836786394297,
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[61] = FSCALE * 0.04735892439114092119,
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[62] = FSCALE * 0.04504920239355780606,
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[63] = FSCALE * 0.04285212686704017991,
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[64] = FSCALE * 0.04076220397836621516,
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[65] = FSCALE * 0.03877420783172200988,
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[66] = FSCALE * 0.03688316740124000544,
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[67] = FSCALE * 0.03508435410084502588,
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[68] = FSCALE * 0.03337326996032607948,
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[69] = FSCALE * 0.03174563637806794323,
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[70] = FSCALE * 0.03019738342231850073,
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[71] = FSCALE * 0.02872463965423942912,
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[72] = FSCALE * 0.02732372244729256080,
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[73] = FSCALE * 0.02599112877875534358,
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[74] = FSCALE * 0.02472352647033939120,
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[75] = FSCALE * 0.02351774585600910823,
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[76] = FSCALE * 0.02237077185616559577,
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[77] = FSCALE * 0.02127973643837716938,
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[78] = FSCALE * 0.02024191144580438847,
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[79] = FSCALE * 0.01925470177538692429,
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[80] = FSCALE * 0.01831563888873418029,
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[81] = FSCALE * 0.01742237463949351138,
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[82] = FSCALE * 0.01657267540176124754,
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[83] = FSCALE * 0.01576441648485449082,
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[84] = FSCALE * 0.01499557682047770621,
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[85] = FSCALE * 0.01426423390899925527,
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[86] = FSCALE * 0.01356855901220093175,
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[87] = FSCALE * 0.01290681258047986886,
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[88] = FSCALE * 0.01227733990306844117,
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[89] = FSCALE * 0.01167856697039544521,
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[90] = FSCALE * 0.01110899653824230649,
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[91] = FSCALE * 0.01056720438385265337,
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[92] = FSCALE * 0.01005183574463358164,
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[93] = FSCALE * 0.00956160193054350793,
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[94] = FSCALE * 0.00909527710169581709,
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[95] = FSCALE * 0.00865169520312063417,
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[96] = FSCALE * 0.00822974704902002884,
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[97] = FSCALE * 0.00782837754922577143,
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[98] = FSCALE * 0.00744658307092434051,
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[99] = FSCALE * 0.00708340892905212004,
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[100] = FSCALE * 0.00673794699908546709,
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[101] = FSCALE * 0.00640933344625638184,
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[102] = FSCALE * 0.00609674656551563610,
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[103] = FSCALE * 0.00579940472684214321,
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[104] = FSCALE * 0.00551656442076077241,
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[105] = FSCALE * 0.00524751839918138427,
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[106] = FSCALE * 0.00499159390691021621,
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[107] = FSCALE * 0.00474815099941147558,
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[108] = FSCALE * 0.00451658094261266798,
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[109] = FSCALE * 0.00429630469075234057,
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[110] = FSCALE * 0.00408677143846406699,
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};
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#endif
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#define CCPU_EXP_MAX 110
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/*
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* This function is analogical to the getpcpu() function in the ps(1) command.
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* They should both calculate in the same way so that the racct %cpu
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* calculations are consistent with the values showed by the ps(1) tool.
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* The calculations are more complex in the 4BSD scheduler because of the value
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* of the ccpu variable. In ULE it is defined to be zero which saves us some
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* work.
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*/
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static uint64_t
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racct_getpcpu(struct proc *p, u_int pcpu)
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{
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u_int swtime;
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#ifdef SCHED_4BSD
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fixpt_t pctcpu, pctcpu_next;
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#endif
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#ifdef SMP
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struct pcpu *pc;
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int found;
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#endif
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fixpt_t p_pctcpu;
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struct thread *td;
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/*
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* If the process is swapped out, we count its %cpu usage as zero.
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* This behaviour is consistent with the userland ps(1) tool.
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*/
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if ((p->p_flag & P_INMEM) == 0)
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return (0);
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swtime = (ticks - p->p_swtick) / hz;
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/*
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* For short-lived processes, the sched_pctcpu() returns small
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* values even for cpu intensive processes. Therefore we use
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* our own estimate in this case.
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*/
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if (swtime < RACCT_PCPU_SECS)
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return (pcpu);
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p_pctcpu = 0;
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FOREACH_THREAD_IN_PROC(p, td) {
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if (td == PCPU_GET(idlethread))
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continue;
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#ifdef SMP
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found = 0;
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STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
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if (td == pc->pc_idlethread) {
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found = 1;
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break;
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}
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}
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if (found)
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continue;
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#endif
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thread_lock(td);
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#ifdef SCHED_4BSD
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pctcpu = sched_pctcpu(td);
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/* Count also the yet unfinished second. */
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pctcpu_next = (pctcpu * ccpu_exp[1]) >> FSHIFT;
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pctcpu_next += sched_pctcpu_delta(td);
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p_pctcpu += max(pctcpu, pctcpu_next);
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#else
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/*
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* In ULE the %cpu statistics are updated on every
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* sched_pctcpu() call. So special calculations to
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* account for the latest (unfinished) second are
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* not needed.
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*/
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p_pctcpu += sched_pctcpu(td);
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#endif
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thread_unlock(td);
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}
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#ifdef SCHED_4BSD
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if (swtime <= CCPU_EXP_MAX)
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return ((100 * (uint64_t)p_pctcpu * 1000000) /
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(FSCALE - ccpu_exp[swtime]));
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#endif
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return ((100 * (uint64_t)p_pctcpu * 1000000) / FSCALE);
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}
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static void
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racct_add_racct(struct racct *dest, const struct racct *src)
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{
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int i;
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mtx_assert(&racct_lock, MA_OWNED);
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/*
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* Update resource usage in dest.
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*/
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for (i = 0; i <= RACCT_MAX; i++) {
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KASSERT(dest->r_resources[i] >= 0,
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("%s: resource %d propagation meltdown: dest < 0",
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__func__, i));
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KASSERT(src->r_resources[i] >= 0,
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("%s: resource %d propagation meltdown: src < 0",
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__func__, i));
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dest->r_resources[i] += src->r_resources[i];
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}
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}
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static void
|
|
racct_sub_racct(struct racct *dest, const struct racct *src)
|
|
{
|
|
int i;
|
|
|
|
mtx_assert(&racct_lock, MA_OWNED);
|
|
|
|
/*
|
|
* Update resource usage in dest.
|
|
*/
|
|
for (i = 0; i <= RACCT_MAX; i++) {
|
|
if (!RACCT_IS_SLOPPY(i) && !RACCT_IS_DECAYING(i)) {
|
|
KASSERT(dest->r_resources[i] >= 0,
|
|
("%s: resource %d propagation meltdown: dest < 0",
|
|
__func__, i));
|
|
KASSERT(src->r_resources[i] >= 0,
|
|
("%s: resource %d propagation meltdown: src < 0",
|
|
__func__, i));
|
|
KASSERT(src->r_resources[i] <= dest->r_resources[i],
|
|
("%s: resource %d propagation meltdown: src > dest",
|
|
__func__, i));
|
|
}
|
|
if (RACCT_CAN_DROP(i)) {
|
|
dest->r_resources[i] -= src->r_resources[i];
|
|
if (dest->r_resources[i] < 0) {
|
|
KASSERT(RACCT_IS_SLOPPY(i) ||
|
|
RACCT_IS_DECAYING(i),
|
|
("%s: resource %d usage < 0", __func__, i));
|
|
dest->r_resources[i] = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
racct_create(struct racct **racctp)
|
|
{
|
|
|
|
SDT_PROBE(racct, kernel, racct, create, racctp, 0, 0, 0, 0);
|
|
|
|
KASSERT(*racctp == NULL, ("racct already allocated"));
|
|
|
|
*racctp = uma_zalloc(racct_zone, M_WAITOK | M_ZERO);
|
|
}
|
|
|
|
static void
|
|
racct_destroy_locked(struct racct **racctp)
|
|
{
|
|
int i;
|
|
struct racct *racct;
|
|
|
|
SDT_PROBE(racct, kernel, racct, destroy, racctp, 0, 0, 0, 0);
|
|
|
|
mtx_assert(&racct_lock, MA_OWNED);
|
|
KASSERT(racctp != NULL, ("NULL racctp"));
|
|
KASSERT(*racctp != NULL, ("NULL racct"));
|
|
|
|
racct = *racctp;
|
|
|
|
for (i = 0; i <= RACCT_MAX; i++) {
|
|
if (RACCT_IS_SLOPPY(i))
|
|
continue;
|
|
if (!RACCT_IS_RECLAIMABLE(i))
|
|
continue;
|
|
KASSERT(racct->r_resources[i] == 0,
|
|
("destroying non-empty racct: "
|
|
"%ju allocated for resource %d\n",
|
|
racct->r_resources[i], i));
|
|
}
|
|
uma_zfree(racct_zone, racct);
|
|
*racctp = NULL;
|
|
}
|
|
|
|
void
|
|
racct_destroy(struct racct **racct)
|
|
{
|
|
|
|
mtx_lock(&racct_lock);
|
|
racct_destroy_locked(racct);
|
|
mtx_unlock(&racct_lock);
|
|
}
|
|
|
|
/*
|
|
* Increase consumption of 'resource' by 'amount' for 'racct'
|
|
* and all its parents. Differently from other cases, 'amount' here
|
|
* may be less than zero.
|
|
*/
|
|
static void
|
|
racct_alloc_resource(struct racct *racct, int resource,
|
|
uint64_t amount)
|
|
{
|
|
|
|
mtx_assert(&racct_lock, MA_OWNED);
|
|
KASSERT(racct != NULL, ("NULL racct"));
|
|
|
|
racct->r_resources[resource] += amount;
|
|
if (racct->r_resources[resource] < 0) {
|
|
KASSERT(RACCT_IS_SLOPPY(resource) || RACCT_IS_DECAYING(resource),
|
|
("%s: resource %d usage < 0", __func__, resource));
|
|
racct->r_resources[resource] = 0;
|
|
}
|
|
|
|
/*
|
|
* There are some cases where the racct %cpu resource would grow
|
|
* beyond 100%.
|
|
* For example in racct_proc_exit() we add the process %cpu usage
|
|
* to the ucred racct containers. If too many processes terminated
|
|
* in a short time span, the ucred %cpu resource could grow too much.
|
|
* Also, the 4BSD scheduler sometimes returns for a thread more than
|
|
* 100% cpu usage. So we set a boundary here to 100%.
|
|
*/
|
|
if ((resource == RACCT_PCTCPU) &&
|
|
(racct->r_resources[RACCT_PCTCPU] > 100 * 1000000))
|
|
racct->r_resources[RACCT_PCTCPU] = 100 * 1000000;
|
|
}
|
|
|
|
static int
|
|
racct_add_locked(struct proc *p, int resource, uint64_t amount)
|
|
{
|
|
#ifdef RCTL
|
|
int error;
|
|
#endif
|
|
|
|
SDT_PROBE(racct, kernel, rusage, add, p, resource, amount, 0, 0);
|
|
|
|
/*
|
|
* We need proc lock to dereference p->p_ucred.
|
|
*/
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
|
|
#ifdef RCTL
|
|
error = rctl_enforce(p, resource, amount);
|
|
if (error && RACCT_IS_DENIABLE(resource)) {
|
|
SDT_PROBE(racct, kernel, rusage, add__failure, p, resource,
|
|
amount, 0, 0);
|
|
return (error);
|
|
}
|
|
#endif
|
|
racct_alloc_resource(p->p_racct, resource, amount);
|
|
racct_add_cred_locked(p->p_ucred, resource, amount);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Increase allocation of 'resource' by 'amount' for process 'p'.
|
|
* Return 0 if it's below limits, or errno, if it's not.
|
|
*/
|
|
int
|
|
racct_add(struct proc *p, int resource, uint64_t amount)
|
|
{
|
|
int error;
|
|
|
|
mtx_lock(&racct_lock);
|
|
error = racct_add_locked(p, resource, amount);
|
|
mtx_unlock(&racct_lock);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
racct_add_cred_locked(struct ucred *cred, int resource, uint64_t amount)
|
|
{
|
|
struct prison *pr;
|
|
|
|
SDT_PROBE(racct, kernel, rusage, add__cred, cred, resource, amount,
|
|
0, 0);
|
|
|
|
racct_alloc_resource(cred->cr_ruidinfo->ui_racct, resource, amount);
|
|
for (pr = cred->cr_prison; pr != NULL; pr = pr->pr_parent)
|
|
racct_alloc_resource(pr->pr_prison_racct->prr_racct, resource,
|
|
amount);
|
|
racct_alloc_resource(cred->cr_loginclass->lc_racct, resource, amount);
|
|
}
|
|
|
|
/*
|
|
* Increase allocation of 'resource' by 'amount' for credential 'cred'.
|
|
* Doesn't check for limits and never fails.
|
|
*
|
|
* XXX: Shouldn't this ever return an error?
|
|
*/
|
|
void
|
|
racct_add_cred(struct ucred *cred, int resource, uint64_t amount)
|
|
{
|
|
|
|
mtx_lock(&racct_lock);
|
|
racct_add_cred_locked(cred, resource, amount);
|
|
mtx_unlock(&racct_lock);
|
|
}
|
|
|
|
/*
|
|
* Increase allocation of 'resource' by 'amount' for process 'p'.
|
|
* Doesn't check for limits and never fails.
|
|
*/
|
|
void
|
|
racct_add_force(struct proc *p, int resource, uint64_t amount)
|
|
{
|
|
|
|
SDT_PROBE(racct, kernel, rusage, add__force, p, resource, amount, 0, 0);
|
|
|
|
/*
|
|
* We need proc lock to dereference p->p_ucred.
|
|
*/
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
|
|
mtx_lock(&racct_lock);
|
|
racct_alloc_resource(p->p_racct, resource, amount);
|
|
mtx_unlock(&racct_lock);
|
|
racct_add_cred(p->p_ucred, resource, amount);
|
|
}
|
|
|
|
static int
|
|
racct_set_locked(struct proc *p, int resource, uint64_t amount)
|
|
{
|
|
int64_t old_amount, decayed_amount;
|
|
int64_t diff_proc, diff_cred;
|
|
#ifdef RCTL
|
|
int error;
|
|
#endif
|
|
|
|
SDT_PROBE(racct, kernel, rusage, set, p, resource, amount, 0, 0);
|
|
|
|
/*
|
|
* We need proc lock to dereference p->p_ucred.
|
|
*/
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
|
|
old_amount = p->p_racct->r_resources[resource];
|
|
/*
|
|
* The diffs may be negative.
|
|
*/
|
|
diff_proc = amount - old_amount;
|
|
if (RACCT_IS_DECAYING(resource)) {
|
|
/*
|
|
* Resources in per-credential racct containers may decay.
|
|
* If this is the case, we need to calculate the difference
|
|
* between the new amount and the proportional value of the
|
|
* old amount that has decayed in the ucred racct containers.
|
|
*/
|
|
decayed_amount = old_amount * RACCT_DECAY_FACTOR / FSCALE;
|
|
diff_cred = amount - decayed_amount;
|
|
} else
|
|
diff_cred = diff_proc;
|
|
#ifdef notyet
|
|
KASSERT(diff_proc >= 0 || RACCT_CAN_DROP(resource),
|
|
("%s: usage of non-droppable resource %d dropping", __func__,
|
|
resource));
|
|
#endif
|
|
#ifdef RCTL
|
|
if (diff_proc > 0) {
|
|
error = rctl_enforce(p, resource, diff_proc);
|
|
if (error && RACCT_IS_DENIABLE(resource)) {
|
|
SDT_PROBE(racct, kernel, rusage, set__failure, p,
|
|
resource, amount, 0, 0);
|
|
return (error);
|
|
}
|
|
}
|
|
#endif
|
|
racct_alloc_resource(p->p_racct, resource, diff_proc);
|
|
if (diff_cred > 0)
|
|
racct_add_cred_locked(p->p_ucred, resource, diff_cred);
|
|
else if (diff_cred < 0)
|
|
racct_sub_cred_locked(p->p_ucred, resource, -diff_cred);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Set allocation of 'resource' to 'amount' for process 'p'.
|
|
* Return 0 if it's below limits, or errno, if it's not.
|
|
*
|
|
* Note that decreasing the allocation always returns 0,
|
|
* even if it's above the limit.
|
|
*/
|
|
int
|
|
racct_set(struct proc *p, int resource, uint64_t amount)
|
|
{
|
|
int error;
|
|
|
|
mtx_lock(&racct_lock);
|
|
error = racct_set_locked(p, resource, amount);
|
|
mtx_unlock(&racct_lock);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
racct_set_force_locked(struct proc *p, int resource, uint64_t amount)
|
|
{
|
|
int64_t old_amount, decayed_amount;
|
|
int64_t diff_proc, diff_cred;
|
|
|
|
SDT_PROBE(racct, kernel, rusage, set, p, resource, amount, 0, 0);
|
|
|
|
/*
|
|
* We need proc lock to dereference p->p_ucred.
|
|
*/
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
|
|
old_amount = p->p_racct->r_resources[resource];
|
|
/*
|
|
* The diffs may be negative.
|
|
*/
|
|
diff_proc = amount - old_amount;
|
|
if (RACCT_IS_DECAYING(resource)) {
|
|
/*
|
|
* Resources in per-credential racct containers may decay.
|
|
* If this is the case, we need to calculate the difference
|
|
* between the new amount and the proportional value of the
|
|
* old amount that has decayed in the ucred racct containers.
|
|
*/
|
|
decayed_amount = old_amount * RACCT_DECAY_FACTOR / FSCALE;
|
|
diff_cred = amount - decayed_amount;
|
|
} else
|
|
diff_cred = diff_proc;
|
|
|
|
racct_alloc_resource(p->p_racct, resource, diff_proc);
|
|
if (diff_cred > 0)
|
|
racct_add_cred_locked(p->p_ucred, resource, diff_cred);
|
|
else if (diff_cred < 0)
|
|
racct_sub_cred_locked(p->p_ucred, resource, -diff_cred);
|
|
}
|
|
|
|
void
|
|
racct_set_force(struct proc *p, int resource, uint64_t amount)
|
|
{
|
|
mtx_lock(&racct_lock);
|
|
racct_set_force_locked(p, resource, amount);
|
|
mtx_unlock(&racct_lock);
|
|
}
|
|
|
|
/*
|
|
* Returns amount of 'resource' the process 'p' can keep allocated.
|
|
* Allocating more than that would be denied, unless the resource
|
|
* is marked undeniable. Amount of already allocated resource does
|
|
* not matter.
|
|
*/
|
|
uint64_t
|
|
racct_get_limit(struct proc *p, int resource)
|
|
{
|
|
|
|
#ifdef RCTL
|
|
return (rctl_get_limit(p, resource));
|
|
#else
|
|
return (UINT64_MAX);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Returns amount of 'resource' the process 'p' can keep allocated.
|
|
* Allocating more than that would be denied, unless the resource
|
|
* is marked undeniable. Amount of already allocated resource does
|
|
* matter.
|
|
*/
|
|
uint64_t
|
|
racct_get_available(struct proc *p, int resource)
|
|
{
|
|
|
|
#ifdef RCTL
|
|
return (rctl_get_available(p, resource));
|
|
#else
|
|
return (UINT64_MAX);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Returns amount of the %cpu resource that process 'p' can add to its %cpu
|
|
* utilization. Adding more than that would lead to the process being
|
|
* throttled.
|
|
*/
|
|
static int64_t
|
|
racct_pcpu_available(struct proc *p)
|
|
{
|
|
|
|
#ifdef RCTL
|
|
return (rctl_pcpu_available(p));
|
|
#else
|
|
return (INT64_MAX);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Decrease allocation of 'resource' by 'amount' for process 'p'.
|
|
*/
|
|
void
|
|
racct_sub(struct proc *p, int resource, uint64_t amount)
|
|
{
|
|
|
|
SDT_PROBE(racct, kernel, rusage, sub, p, resource, amount, 0, 0);
|
|
|
|
/*
|
|
* We need proc lock to dereference p->p_ucred.
|
|
*/
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
KASSERT(RACCT_CAN_DROP(resource),
|
|
("%s: called for non-droppable resource %d", __func__, resource));
|
|
|
|
mtx_lock(&racct_lock);
|
|
KASSERT(amount <= p->p_racct->r_resources[resource],
|
|
("%s: freeing %ju of resource %d, which is more "
|
|
"than allocated %jd for %s (pid %d)", __func__, amount, resource,
|
|
(intmax_t)p->p_racct->r_resources[resource], p->p_comm, p->p_pid));
|
|
|
|
racct_alloc_resource(p->p_racct, resource, -amount);
|
|
racct_sub_cred_locked(p->p_ucred, resource, amount);
|
|
mtx_unlock(&racct_lock);
|
|
}
|
|
|
|
static void
|
|
racct_sub_cred_locked(struct ucred *cred, int resource, uint64_t amount)
|
|
{
|
|
struct prison *pr;
|
|
|
|
SDT_PROBE(racct, kernel, rusage, sub__cred, cred, resource, amount,
|
|
0, 0);
|
|
|
|
#ifdef notyet
|
|
KASSERT(RACCT_CAN_DROP(resource),
|
|
("%s: called for resource %d which can not drop", __func__,
|
|
resource));
|
|
#endif
|
|
|
|
racct_alloc_resource(cred->cr_ruidinfo->ui_racct, resource, -amount);
|
|
for (pr = cred->cr_prison; pr != NULL; pr = pr->pr_parent)
|
|
racct_alloc_resource(pr->pr_prison_racct->prr_racct, resource,
|
|
-amount);
|
|
racct_alloc_resource(cred->cr_loginclass->lc_racct, resource, -amount);
|
|
}
|
|
|
|
/*
|
|
* Decrease allocation of 'resource' by 'amount' for credential 'cred'.
|
|
*/
|
|
void
|
|
racct_sub_cred(struct ucred *cred, int resource, uint64_t amount)
|
|
{
|
|
|
|
mtx_lock(&racct_lock);
|
|
racct_sub_cred_locked(cred, resource, amount);
|
|
mtx_unlock(&racct_lock);
|
|
}
|
|
|
|
/*
|
|
* Inherit resource usage information from the parent process.
|
|
*/
|
|
int
|
|
racct_proc_fork(struct proc *parent, struct proc *child)
|
|
{
|
|
int i, error = 0;
|
|
|
|
/*
|
|
* Create racct for the child process.
|
|
*/
|
|
racct_create(&child->p_racct);
|
|
|
|
PROC_LOCK(parent);
|
|
PROC_LOCK(child);
|
|
mtx_lock(&racct_lock);
|
|
|
|
#ifdef RCTL
|
|
error = rctl_proc_fork(parent, child);
|
|
if (error != 0)
|
|
goto out;
|
|
#endif
|
|
|
|
/* Init process cpu time. */
|
|
child->p_prev_runtime = 0;
|
|
child->p_throttled = 0;
|
|
|
|
/*
|
|
* Inherit resource usage.
|
|
*/
|
|
for (i = 0; i <= RACCT_MAX; i++) {
|
|
if (parent->p_racct->r_resources[i] == 0 ||
|
|
!RACCT_IS_INHERITABLE(i))
|
|
continue;
|
|
|
|
error = racct_set_locked(child, i,
|
|
parent->p_racct->r_resources[i]);
|
|
if (error != 0)
|
|
goto out;
|
|
}
|
|
|
|
error = racct_add_locked(child, RACCT_NPROC, 1);
|
|
error += racct_add_locked(child, RACCT_NTHR, 1);
|
|
|
|
out:
|
|
mtx_unlock(&racct_lock);
|
|
PROC_UNLOCK(child);
|
|
PROC_UNLOCK(parent);
|
|
|
|
if (error != 0)
|
|
racct_proc_exit(child);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Called at the end of fork1(), to handle rules that require the process
|
|
* to be fully initialized.
|
|
*/
|
|
void
|
|
racct_proc_fork_done(struct proc *child)
|
|
{
|
|
|
|
#ifdef RCTL
|
|
PROC_LOCK(child);
|
|
mtx_lock(&racct_lock);
|
|
rctl_enforce(child, RACCT_NPROC, 0);
|
|
rctl_enforce(child, RACCT_NTHR, 0);
|
|
mtx_unlock(&racct_lock);
|
|
PROC_UNLOCK(child);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
racct_proc_exit(struct proc *p)
|
|
{
|
|
int i;
|
|
uint64_t runtime;
|
|
struct timeval wallclock;
|
|
uint64_t pct_estimate, pct;
|
|
|
|
PROC_LOCK(p);
|
|
/*
|
|
* We don't need to calculate rux, proc_reap() has already done this.
|
|
*/
|
|
runtime = cputick2usec(p->p_rux.rux_runtime);
|
|
#ifdef notyet
|
|
KASSERT(runtime >= p->p_prev_runtime, ("runtime < p_prev_runtime"));
|
|
#else
|
|
if (runtime < p->p_prev_runtime)
|
|
runtime = p->p_prev_runtime;
|
|
#endif
|
|
microuptime(&wallclock);
|
|
timevalsub(&wallclock, &p->p_stats->p_start);
|
|
if (wallclock.tv_sec > 0 || wallclock.tv_usec > 0) {
|
|
pct_estimate = (1000000 * runtime * 100) /
|
|
((uint64_t)wallclock.tv_sec * 1000000 +
|
|
wallclock.tv_usec);
|
|
} else
|
|
pct_estimate = 0;
|
|
pct = racct_getpcpu(p, pct_estimate);
|
|
|
|
mtx_lock(&racct_lock);
|
|
racct_set_locked(p, RACCT_CPU, runtime);
|
|
racct_add_cred_locked(p->p_ucred, RACCT_PCTCPU, pct);
|
|
|
|
for (i = 0; i <= RACCT_MAX; i++) {
|
|
if (p->p_racct->r_resources[i] == 0)
|
|
continue;
|
|
if (!RACCT_IS_RECLAIMABLE(i))
|
|
continue;
|
|
racct_set_locked(p, i, 0);
|
|
}
|
|
|
|
mtx_unlock(&racct_lock);
|
|
PROC_UNLOCK(p);
|
|
|
|
#ifdef RCTL
|
|
rctl_racct_release(p->p_racct);
|
|
#endif
|
|
racct_destroy(&p->p_racct);
|
|
}
|
|
|
|
/*
|
|
* Called after credentials change, to move resource utilisation
|
|
* between raccts.
|
|
*/
|
|
void
|
|
racct_proc_ucred_changed(struct proc *p, struct ucred *oldcred,
|
|
struct ucred *newcred)
|
|
{
|
|
struct uidinfo *olduip, *newuip;
|
|
struct loginclass *oldlc, *newlc;
|
|
struct prison *oldpr, *newpr, *pr;
|
|
|
|
PROC_LOCK_ASSERT(p, MA_NOTOWNED);
|
|
|
|
newuip = newcred->cr_ruidinfo;
|
|
olduip = oldcred->cr_ruidinfo;
|
|
newlc = newcred->cr_loginclass;
|
|
oldlc = oldcred->cr_loginclass;
|
|
newpr = newcred->cr_prison;
|
|
oldpr = oldcred->cr_prison;
|
|
|
|
mtx_lock(&racct_lock);
|
|
if (newuip != olduip) {
|
|
racct_sub_racct(olduip->ui_racct, p->p_racct);
|
|
racct_add_racct(newuip->ui_racct, p->p_racct);
|
|
}
|
|
if (newlc != oldlc) {
|
|
racct_sub_racct(oldlc->lc_racct, p->p_racct);
|
|
racct_add_racct(newlc->lc_racct, p->p_racct);
|
|
}
|
|
if (newpr != oldpr) {
|
|
for (pr = oldpr; pr != NULL; pr = pr->pr_parent)
|
|
racct_sub_racct(pr->pr_prison_racct->prr_racct,
|
|
p->p_racct);
|
|
for (pr = newpr; pr != NULL; pr = pr->pr_parent)
|
|
racct_add_racct(pr->pr_prison_racct->prr_racct,
|
|
p->p_racct);
|
|
}
|
|
mtx_unlock(&racct_lock);
|
|
|
|
#ifdef RCTL
|
|
rctl_proc_ucred_changed(p, newcred);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
racct_move(struct racct *dest, struct racct *src)
|
|
{
|
|
|
|
mtx_lock(&racct_lock);
|
|
|
|
racct_add_racct(dest, src);
|
|
racct_sub_racct(src, src);
|
|
|
|
mtx_unlock(&racct_lock);
|
|
}
|
|
|
|
static void
|
|
racct_proc_throttle(struct proc *p)
|
|
{
|
|
struct thread *td;
|
|
#ifdef SMP
|
|
int cpuid;
|
|
#endif
|
|
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
|
|
/*
|
|
* Do not block kernel processes. Also do not block processes with
|
|
* low %cpu utilization to improve interactivity.
|
|
*/
|
|
if (((p->p_flag & (P_SYSTEM | P_KTHREAD)) != 0) ||
|
|
(p->p_racct->r_resources[RACCT_PCTCPU] <= pcpu_threshold))
|
|
return;
|
|
p->p_throttled = 1;
|
|
|
|
FOREACH_THREAD_IN_PROC(p, td) {
|
|
thread_lock(td);
|
|
switch (td->td_state) {
|
|
case TDS_RUNQ:
|
|
/*
|
|
* If the thread is on the scheduler run-queue, we can
|
|
* not just remove it from there. So we set the flag
|
|
* TDF_NEEDRESCHED for the thread, so that once it is
|
|
* running, it is taken off the cpu as soon as possible.
|
|
*/
|
|
td->td_flags |= TDF_NEEDRESCHED;
|
|
break;
|
|
case TDS_RUNNING:
|
|
/*
|
|
* If the thread is running, we request a context
|
|
* switch for it by setting the TDF_NEEDRESCHED flag.
|
|
*/
|
|
td->td_flags |= TDF_NEEDRESCHED;
|
|
#ifdef SMP
|
|
cpuid = td->td_oncpu;
|
|
if ((cpuid != NOCPU) && (td != curthread))
|
|
ipi_cpu(cpuid, IPI_AST);
|
|
#endif
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
thread_unlock(td);
|
|
}
|
|
}
|
|
|
|
static void
|
|
racct_proc_wakeup(struct proc *p)
|
|
{
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
|
|
if (p->p_throttled) {
|
|
p->p_throttled = 0;
|
|
wakeup(p->p_racct);
|
|
}
|
|
}
|
|
|
|
static void
|
|
racct_decay_resource(struct racct *racct, void * res, void* dummy)
|
|
{
|
|
int resource;
|
|
int64_t r_old, r_new;
|
|
|
|
resource = *(int *)res;
|
|
r_old = racct->r_resources[resource];
|
|
|
|
/* If there is nothing to decay, just exit. */
|
|
if (r_old <= 0)
|
|
return;
|
|
|
|
mtx_lock(&racct_lock);
|
|
r_new = r_old * RACCT_DECAY_FACTOR / FSCALE;
|
|
racct->r_resources[resource] = r_new;
|
|
mtx_unlock(&racct_lock);
|
|
}
|
|
|
|
static void
|
|
racct_decay(int resource)
|
|
{
|
|
ui_racct_foreach(racct_decay_resource, &resource, NULL);
|
|
loginclass_racct_foreach(racct_decay_resource, &resource, NULL);
|
|
prison_racct_foreach(racct_decay_resource, &resource, NULL);
|
|
}
|
|
|
|
static void
|
|
racctd(void)
|
|
{
|
|
struct thread *td;
|
|
struct proc *p;
|
|
struct timeval wallclock;
|
|
uint64_t runtime;
|
|
uint64_t pct, pct_estimate;
|
|
|
|
for (;;) {
|
|
racct_decay(RACCT_PCTCPU);
|
|
|
|
sx_slock(&allproc_lock);
|
|
|
|
LIST_FOREACH(p, &zombproc, p_list) {
|
|
PROC_LOCK(p);
|
|
racct_set(p, RACCT_PCTCPU, 0);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
|
|
FOREACH_PROC_IN_SYSTEM(p) {
|
|
PROC_LOCK(p);
|
|
if (p->p_state != PRS_NORMAL) {
|
|
PROC_UNLOCK(p);
|
|
continue;
|
|
}
|
|
|
|
microuptime(&wallclock);
|
|
timevalsub(&wallclock, &p->p_stats->p_start);
|
|
PROC_SLOCK(p);
|
|
FOREACH_THREAD_IN_PROC(p, td)
|
|
ruxagg(p, td);
|
|
runtime = cputick2usec(p->p_rux.rux_runtime);
|
|
PROC_SUNLOCK(p);
|
|
#ifdef notyet
|
|
KASSERT(runtime >= p->p_prev_runtime,
|
|
("runtime < p_prev_runtime"));
|
|
#else
|
|
if (runtime < p->p_prev_runtime)
|
|
runtime = p->p_prev_runtime;
|
|
#endif
|
|
p->p_prev_runtime = runtime;
|
|
if (wallclock.tv_sec > 0 || wallclock.tv_usec > 0) {
|
|
pct_estimate = (1000000 * runtime * 100) /
|
|
((uint64_t)wallclock.tv_sec * 1000000 +
|
|
wallclock.tv_usec);
|
|
} else
|
|
pct_estimate = 0;
|
|
pct = racct_getpcpu(p, pct_estimate);
|
|
mtx_lock(&racct_lock);
|
|
racct_set_force_locked(p, RACCT_PCTCPU, pct);
|
|
racct_set_locked(p, RACCT_CPU, runtime);
|
|
racct_set_locked(p, RACCT_WALLCLOCK,
|
|
(uint64_t)wallclock.tv_sec * 1000000 +
|
|
wallclock.tv_usec);
|
|
mtx_unlock(&racct_lock);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
|
|
/*
|
|
* To ensure that processes are throttled in a fair way, we need
|
|
* to iterate over all processes again and check the limits
|
|
* for %cpu resource only after ucred racct containers have been
|
|
* properly filled.
|
|
*/
|
|
FOREACH_PROC_IN_SYSTEM(p) {
|
|
PROC_LOCK(p);
|
|
if (p->p_state != PRS_NORMAL) {
|
|
PROC_UNLOCK(p);
|
|
continue;
|
|
}
|
|
|
|
if (racct_pcpu_available(p) <= 0)
|
|
racct_proc_throttle(p);
|
|
else if (p->p_throttled)
|
|
racct_proc_wakeup(p);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
sx_sunlock(&allproc_lock);
|
|
pause("-", hz);
|
|
}
|
|
}
|
|
|
|
static struct kproc_desc racctd_kp = {
|
|
"racctd",
|
|
racctd,
|
|
NULL
|
|
};
|
|
SYSINIT(racctd, SI_SUB_RACCTD, SI_ORDER_FIRST, kproc_start, &racctd_kp);
|
|
|
|
static void
|
|
racct_init(void)
|
|
{
|
|
|
|
racct_zone = uma_zcreate("racct", sizeof(struct racct),
|
|
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
|
|
/*
|
|
* XXX: Move this somewhere.
|
|
*/
|
|
prison0.pr_prison_racct = prison_racct_find("0");
|
|
}
|
|
SYSINIT(racct, SI_SUB_RACCT, SI_ORDER_FIRST, racct_init, NULL);
|
|
|
|
#endif /* !RACCT */
|