158 lines
5.1 KiB
C
158 lines
5.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1999,2000 Jonathan Lemon <jlemon@FreeBSD.org>
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* All rights reserved.
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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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#ifndef _SYS_EVENTVAR_H_
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#define _SYS_EVENTVAR_H_
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#ifndef _KERNEL
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#error "no user-serviceable parts inside"
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#endif
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#include <sys/_task.h>
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#include <sys/veclist.h>
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#include <sys/stdint.h>
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/rwlock.h>
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#define KQ_NEVENTS 8 /* minimize copy{in,out} calls */
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#define KQEXTENT 256 /* linear growth by this amount */
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#define KQDIR_ACTIVE (0)
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#define KQDIR_INACTIVE (1)
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struct kevq {
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/* 1st cacheline */
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/* Sched stats */
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u_long kevq_rand_seed;
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uint64_t kevq_avg_lat;
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uint64_t kevq_avg_ev;
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uint64_t kevq_tot_ev;
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uint64_t kevq_tot_time;
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/* the following two are only set when the thread is procssing in userspace
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* in kernel they are set to special value KEVQ_LAST_KERN
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*/
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#define KEVQ_LAST_KERN (0)
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uint64_t kevq_last_kev;
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uint32_t kevq_last_nkev;
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#define KEVQ_SLEEP 0x01
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#define KEVQ_CLOSING 0x02
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#define KEVQ_ACTIVE 0x04
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#define KEVQ_WS 0x08 /* the kevq is work stealing */
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int kevq_state;
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int kn_count; /* number of pending knotes */
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int kn_rt_count; /* number of runtime knotes */
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/* end 1st cache line */
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LIST_ENTRY(kevq) kevq_th_e; /* entry into kevq_thred's hashtable */
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LIST_ENTRY(kevq) kq_e; /* entry into kq */
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LIST_ENTRY(kevq) kevq_th_tqe; /* entry into kevq_thred's kevq_list */
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struct kqueue *kq; /* the kq that the kevq belongs to */
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struct kqdom *kevq_kqd; /* the kq domain the kevq is on */
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/* XXX: Make kevq contain a struct thread ptr instead of this dude */
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struct kevq_thred *kevq_th; /* the thread that the kevq belongs to */
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struct mtx lock; /* the lock for the kevq */
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struct ktailq kn_head; /* list of pending knotes */
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struct knote *kn_marker;
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struct ktailq kn_rt_head; /* list of pending knotes with runtime priority */
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struct knote *kn_marker_rt;
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int kevq_refcnt;
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/* TODO: maybe these should be in kqdomain or global */
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uint64_t kevq_tot_fallback;
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uint64_t kevq_tot_kqd_mismatch;
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uint64_t kevq_tot_sched;
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uint64_t kevq_tot_realtime;
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uint64_t kevq_tot_syscall;
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uint64_t kevq_tot_ws;
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uint64_t kevq_avg_rlimit;
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};
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/* TODO: assumed that threads don't get rescheduled across cores */
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struct kqdom {
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/* static */
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int id;
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struct rwlock kqd_lock;
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struct kqdom *parent;
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cpuset_t cpu_mask;
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struct veclist children; /* child kqdoms */
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/* statistics. Atomically updated, doesn't require the lock*/
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uint64_t avg_lat;
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/* dynamic members*/
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struct veclist kqd_activelist; /* active child kqdoms */
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struct veclist kqd_kevqs; /* kevqs for this kqdom */
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};
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struct kqueue {
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struct mtx kq_lock;
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struct selinfo kq_sel;
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int kq_state;
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#define KQ_SEL 0x01
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#define KQ_ASYNC 0x02
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#define KQ_TASKSCHED 0x04 /* task scheduled */
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#define KQ_TASKDRAIN 0x08 /* waiting for task to drain */
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#define KQ_CLOSING 0x10
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int kq_flags;
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#define KQ_FLAG_INIT 0x01 /* kqueue has been initialized. this flag is set after the first kevent structure is processed */
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#define KQ_FLAG_MULTI 0x02 /* Multi-threaded mode */
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TAILQ_ENTRY(kqueue) kq_list;
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struct sigio *kq_sigio;
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struct filedesc *kq_fdp;
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int kq_knlistsize; /* size of knlist */
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struct klist *kq_knlist; /* list of knotes */
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u_long kq_knhashmask; /* size of knhash */
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struct klist *kq_knhash; /* hash table for knotes */
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struct kevq *kq_kevq; /* the kevq for kq, always created, act as buffer queue in multithreaded mode */
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struct task kq_task;
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struct ucred *kq_cred;
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struct kevqlist kq_kevqlist; /* list of kevqs */
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/* scheduler flags for the KQ, set by IOCTL */
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int kq_sfeat;
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int kq_ssargs;
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int kq_ssched;
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int kq_sfargs;
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/* tuneables for the KQ, set by IOCTL */
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int kq_tfreq;
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int kq_rtshare;
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/* Default */
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struct rwlock kevq_vlist_lk;
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struct veclist kevq_vlist;
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/* CPU queue */
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struct kqdom *kq_kqd; /* root domain */
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};
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#endif /* !_SYS_EVENTVAR_H_ */
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