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- Use DPCPU for SCHED_STATS. This is somewhat awkward because the

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offset of the stat is not known until link time so we must emit a
   function to call SYSCTL_ADD_PROC rather than using SYSCTL_PROC
   directly.
 - Eliminate the atomic from SCHED_STAT_INC now that it's using per-cpu
   variables.  Sched stats are always incremented while we're holding
   a spinlock so no further protection is required.

Reviewed by:	sam
This commit is contained in:
jeff 2009-06-25 01:33:51 +00:00
parent a90de6966f
commit 826fa583d1
2 changed files with 55 additions and 23 deletions
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55
sys/kern/kern_switch.c
View File

@ -79,31 +79,45 @@ SYSCTL_INT(_kern_sched, OID_AUTO, preemption, CTLFLAG_RD,
* with SCHED_STAT_DEFINE().
*/
#ifdef SCHED_STATS
long sched_switch_stats[SWT_COUNT]; /* Switch reasons from mi_switch(). */
SYSCTL_NODE(_kern_sched, OID_AUTO, stats, CTLFLAG_RW, 0, "switch stats");
SCHED_STAT_DEFINE_VAR(uncategorized, &sched_switch_stats[SWT_NONE], "");
SCHED_STAT_DEFINE_VAR(preempt, &sched_switch_stats[SWT_PREEMPT], "");
SCHED_STAT_DEFINE_VAR(owepreempt, &sched_switch_stats[SWT_OWEPREEMPT], "");
SCHED_STAT_DEFINE_VAR(turnstile, &sched_switch_stats[SWT_TURNSTILE], "");
SCHED_STAT_DEFINE_VAR(sleepq, &sched_switch_stats[SWT_SLEEPQ], "");
SCHED_STAT_DEFINE_VAR(sleepqtimo, &sched_switch_stats[SWT_SLEEPQTIMO], "");
SCHED_STAT_DEFINE_VAR(relinquish, &sched_switch_stats[SWT_RELINQUISH], "");
SCHED_STAT_DEFINE_VAR(needresched, &sched_switch_stats[SWT_NEEDRESCHED], "");
SCHED_STAT_DEFINE_VAR(idle, &sched_switch_stats[SWT_IDLE], "");
SCHED_STAT_DEFINE_VAR(iwait, &sched_switch_stats[SWT_IWAIT], "");
SCHED_STAT_DEFINE_VAR(suspend, &sched_switch_stats[SWT_SUSPEND], "");
SCHED_STAT_DEFINE_VAR(remotepreempt, &sched_switch_stats[SWT_REMOTEPREEMPT],
"");
SCHED_STAT_DEFINE_VAR(remotewakeidle, &sched_switch_stats[SWT_REMOTEWAKEIDLE],
"");
/* Switch reasons from mi_switch(). */
DPCPU_DEFINE(long, sched_switch_stats[SWT_COUNT]);
SCHED_STAT_DEFINE_VAR(uncategorized,
&DPCPU_NAME(sched_switch_stats[SWT_NONE]), "");
SCHED_STAT_DEFINE_VAR(preempt,
&DPCPU_NAME(sched_switch_stats[SWT_PREEMPT]), "");
SCHED_STAT_DEFINE_VAR(owepreempt,
&DPCPU_NAME(sched_switch_stats[SWT_OWEPREEMPT]), "");
SCHED_STAT_DEFINE_VAR(turnstile,
&DPCPU_NAME(sched_switch_stats[SWT_TURNSTILE]), "");
SCHED_STAT_DEFINE_VAR(sleepq,
&DPCPU_NAME(sched_switch_stats[SWT_SLEEPQ]), "");
SCHED_STAT_DEFINE_VAR(sleepqtimo,
&DPCPU_NAME(sched_switch_stats[SWT_SLEEPQTIMO]), "");
SCHED_STAT_DEFINE_VAR(relinquish,
&DPCPU_NAME(sched_switch_stats[SWT_RELINQUISH]), "");
SCHED_STAT_DEFINE_VAR(needresched,
&DPCPU_NAME(sched_switch_stats[SWT_NEEDRESCHED]), "");
SCHED_STAT_DEFINE_VAR(idle,
&DPCPU_NAME(sched_switch_stats[SWT_IDLE]), "");
SCHED_STAT_DEFINE_VAR(iwait,
&DPCPU_NAME(sched_switch_stats[SWT_IWAIT]), "");
SCHED_STAT_DEFINE_VAR(suspend,
&DPCPU_NAME(sched_switch_stats[SWT_SUSPEND]), "");
SCHED_STAT_DEFINE_VAR(remotepreempt,
&DPCPU_NAME(sched_switch_stats[SWT_REMOTEPREEMPT]), "");
SCHED_STAT_DEFINE_VAR(remotewakeidle,
&DPCPU_NAME(sched_switch_stats[SWT_REMOTEWAKEIDLE]), "");
static int
sysctl_stats_reset(SYSCTL_HANDLER_ARGS)
{
struct sysctl_oid *p;
uintptr_t counter;
int error;
int val;
int i;
val = 0;
error = sysctl_handle_int(oidp, &val, 0, req);
@ -118,7 +132,12 @@ sysctl_stats_reset(SYSCTL_HANDLER_ARGS)
SLIST_FOREACH(p, oidp->oid_parent, oid_link) {
if (p == oidp || p->oid_arg1 == NULL)
continue;
*(long *)p->oid_arg1 = 0;
counter = (uintptr_t)p->oid_arg1;
for (i = 0; i <= mp_maxid; i++) {
if (CPU_ABSENT(i))
continue;
*(long *)(dpcpu_off[i] + counter) = 0;
}
}
return (0);
}

23
sys/sys/sched.h
View File

@ -162,14 +162,27 @@ sched_unpin(void)
/* Scheduler stats. */
#ifdef SCHED_STATS
extern long sched_switch_stats[SWT_COUNT];
DPCPU_DECLARE(long, sched_switch_stats[SWT_COUNT]);
#define SCHED_STAT_DEFINE_VAR(name, ptr, descr) \
SYSCTL_LONG(_kern_sched_stats, OID_AUTO, name, CTLFLAG_RD, ptr, 0, descr)
static void name ## _add_proc(void *dummy __unused) \
{ \
\
SYSCTL_ADD_PROC(NULL, \
SYSCTL_STATIC_CHILDREN(_kern_sched_stats), OID_AUTO, \
#name, CTLTYPE_LONG|CTLFLAG_RD|CTLFLAG_MPSAFE, \
ptr, 0, sysctl_dpcpu_long, "LU", descr); \
} \
SYSINIT(name, SI_SUB_RUN_SCHEDULER, SI_ORDER_ANY, name ## _add_proc, NULL);
#define SCHED_STAT_DEFINE(name, descr) \
unsigned long name; \
SCHED_STAT_DEFINE_VAR(name, &name, descr)
#define SCHED_STAT_INC(var) atomic_add_long(&(var), 1)
DPCPU_DEFINE(unsigned long, name); \
SCHED_STAT_DEFINE_VAR(name, &DPCPU_NAME(name), descr)
/*
* Sched stats are always incremented in critical sections so no atomic
* is necesssary to increment them.
*/
#define SCHED_STAT_INC(var) DPCPU_GET(var)++;
#else
#define SCHED_STAT_DEFINE_VAR(name, descr, ptr)
#define SCHED_STAT_DEFINE(name, descr)