f0e185d705
disk I/O processing.
The intent is that the disk driver in its hardware interrupt
routine will simply schedule the bio on the task queue with
a routine to finish off whatever needs done.
The g_up thread will then schedule this routine, the likely
outcome of which is a biodone() which queues the bio on
g_up's regular queue where it will be picked up and processed.
Compared to the using the regular taskqueue, this saves one
contextswitch.
Change our scheduling of the g_up and g_down queues to be water-tight,
at the cost of breaking the userland regression test-shims.
Input and ideas from: scottl
242 lines
6.5 KiB
C
242 lines
6.5 KiB
C
/*-
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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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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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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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/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/bio.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sx.h>
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#include <sys/sbuf.h>
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#include <geom/geom.h>
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#include <geom/geom_int.h>
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#include <geom/geom_stats.h>
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MALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures");
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struct sx topology_lock;
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static struct proc *g_up_proc;
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int g_debugflags;
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int g_collectstats = 1;
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/*
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* G_UP and G_DOWN are the two threads which push I/O through the
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* stack.
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*
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* Things are procesed in a FIFO order, but these threads could be
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* part of I/O prioritization by deciding which bios/bioqs to service
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* in what order.
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*
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* We have only one thread in each direction, it is belived that until
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* a very non-trivial workload in the UP/DOWN path this will be enough,
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* but more than one can actually be run without problems.
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*
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* Holding the "mymutex" is a debugging feature: It prevents people
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* from sleeping in the UP/DOWN I/O path by mistake or design (doing
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* so almost invariably result in deadlocks since it stalls all I/O
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* processing in the given direction.
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*/
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static void
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g_up_procbody(void)
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{
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struct proc *p = g_up_proc;
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struct thread *tp = FIRST_THREAD_IN_PROC(p);
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mtx_assert(&Giant, MA_NOTOWNED);
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tp->td_base_pri = PRIBIO;
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for(;;) {
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g_io_schedule_up(tp);
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}
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}
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struct kproc_desc g_up_kp = {
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"g_up",
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g_up_procbody,
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&g_up_proc,
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};
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static struct proc *g_down_proc;
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static void
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g_down_procbody(void)
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{
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struct proc *p = g_down_proc;
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struct thread *tp = FIRST_THREAD_IN_PROC(p);
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mtx_assert(&Giant, MA_NOTOWNED);
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tp->td_base_pri = PRIBIO;
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for(;;) {
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g_io_schedule_down(tp);
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}
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}
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struct kproc_desc g_down_kp = {
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"g_down",
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g_down_procbody,
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&g_down_proc,
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};
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static struct proc *g_event_proc;
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static void
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g_event_procbody(void)
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{
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struct proc *p = g_event_proc;
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struct thread *tp = FIRST_THREAD_IN_PROC(p);
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mtx_assert(&Giant, MA_NOTOWNED);
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tp->td_base_pri = PRIBIO;
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for(;;) {
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g_run_events();
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tsleep(&g_wait_event, PRIBIO, "g_events", hz/10);
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}
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}
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struct kproc_desc g_event_kp = {
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"g_event",
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g_event_procbody,
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&g_event_proc,
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};
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void
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g_init(void)
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{
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sx_init(&topology_lock, "GEOM topology");
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g_stat_init();
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g_io_init();
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g_event_init();
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mtx_lock(&Giant);
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kproc_start(&g_event_kp);
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kproc_start(&g_up_kp);
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kproc_start(&g_down_kp);
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mtx_unlock(&Giant);
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}
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static int
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sysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS)
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{
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int error;
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struct sbuf *sb;
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sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
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sbuf_clear(sb);
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g_call_me(g_conftxt, sb);
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do {
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tsleep(sb, PZERO, "g_conftxt", hz);
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} while(!sbuf_done(sb));
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error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
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sbuf_delete(sb);
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return error;
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}
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static int
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sysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS)
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{
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int error;
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struct sbuf *sb;
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sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
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sbuf_clear(sb);
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g_call_me(g_confdot, sb);
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do {
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tsleep(sb, PZERO, "g_confdot", hz);
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} while(!sbuf_done(sb));
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error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
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sbuf_delete(sb);
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return error;
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}
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static int
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sysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS)
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{
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int error;
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struct sbuf *sb;
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sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
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sbuf_clear(sb);
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g_call_me(g_confxml, sb);
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do {
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tsleep(sb, PZERO, "g_confxml", hz);
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} while(!sbuf_done(sb));
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error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
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sbuf_delete(sb);
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return error;
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}
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SYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management");
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SYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD,
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0, 0, sysctl_kern_geom_confxml, "",
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"Dump the GEOM config in XML");
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SYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD,
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0, 0, sysctl_kern_geom_confdot, "",
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"Dump the GEOM config in dot");
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SYSCTL_PROC(_kern_geom, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RD,
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0, 0, sysctl_kern_geom_conftxt, "",
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"Dump the GEOM config in txt");
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SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RW,
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&g_debugflags, 0, "");
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SYSCTL_INT(_kern_geom, OID_AUTO, collectstats, CTLFLAG_RW,
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&g_collectstats, 0, "");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD,
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0, sizeof(struct g_class), "");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD,
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0, sizeof(struct g_geom), "");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD,
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0, sizeof(struct g_provider), "");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD,
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0, sizeof(struct g_consumer), "");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD,
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0, sizeof(struct g_bioq), "");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_event, CTLFLAG_RD,
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0, sizeof(struct g_event), "");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_stat, CTLFLAG_RD,
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0, sizeof(struct g_stat), "");
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