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Add schedgraph traces for callout handlers. Specifically, a callwheel logs

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a running event each time it executes a callout function.  The event
includes the function pointer, argument, and whether or not it was run from
hardware interrupt context.  The callwheel is marked idle when each handler
completes.  This effectively logs the duration of each callout routine in
the graph.
This commit is contained in:
John Baldwin 2014-10-08 16:22:59 +00:00
parent 82315915e0
commit 232e8b52b0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=272757
2 changed files with 10 additions and 7 deletions
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14
sys/kern/kern_timeout.c
View File

@ -163,6 +163,7 @@ struct callout_cpu {
sbintime_t cc_lastscan;
void *cc_cookie;
u_int cc_bucket;
char cc_ktr_event_name[20];
};
#define cc_exec_curr cc_exec_entity[0].cc_curr
@ -201,7 +202,7 @@ struct callout_cpu cc_cpu;
static int timeout_cpu;
static void callout_cpu_init(struct callout_cpu *cc);
static void callout_cpu_init(struct callout_cpu *cc, int cpu);
static void softclock_call_cc(struct callout *c, struct callout_cpu *cc,
#ifdef CALLOUT_PROFILING
int *mpcalls, int *lockcalls, int *gcalls,
@ -302,7 +303,7 @@ callout_callwheel_init(void *dummy)
cc = CC_CPU(timeout_cpu);
cc->cc_callout = malloc(ncallout * sizeof(struct callout),
M_CALLOUT, M_WAITOK);
callout_cpu_init(cc);
callout_cpu_init(cc, timeout_cpu);
}
SYSINIT(callwheel_init, SI_SUB_CPU, SI_ORDER_ANY, callout_callwheel_init, NULL);
@ -310,7 +311,7 @@ SYSINIT(callwheel_init, SI_SUB_CPU, SI_ORDER_ANY, callout_callwheel_init, NULL);
* Initialize the per-cpu callout structures.
*/
static void
callout_cpu_init(struct callout_cpu *cc)
callout_cpu_init(struct callout_cpu *cc, int cpu)
{
struct callout *c;
int i;
@ -325,6 +326,8 @@ callout_cpu_init(struct callout_cpu *cc)
cc->cc_firstevent = SBT_MAX;
for (i = 0; i < 2; i++)
cc_cce_cleanup(cc, i);
snprintf(cc->cc_ktr_event_name, sizeof(cc->cc_ktr_event_name),
"callwheel cpu %d", cpu);
if (cc->cc_callout == NULL) /* Only cpu0 handles timeout(9) */
return;
for (i = 0; i < ncallout; i++) {
@ -396,7 +399,7 @@ start_softclock(void *dummy)
continue;
cc = CC_CPU(cpu);
cc->cc_callout = NULL; /* Only cpu0 handles timeout(9). */
callout_cpu_init(cc);
callout_cpu_init(cc, cpu);
snprintf(name, sizeof(name), "clock (%d)", cpu);
ie = NULL;
if (swi_add(&ie, name, softclock, cc, SWI_CLOCK,
@ -711,6 +714,8 @@ softclock_call_cc(struct callout *c, struct callout_cpu *cc,
CTR3(KTR_CALLOUT, "callout %p func %p arg %p",
c, c_func, c_arg);
}
KTR_STATE3(KTR_SCHED, "callout", cc->cc_ktr_event_name, "running",
"func:%p", c_func, "arg:%p", c_arg, "direct:%d", direct);
#if defined(DIAGNOSTIC) || defined(CALLOUT_PROFILING)
sbt1 = sbinuptime();
#endif
@ -733,6 +738,7 @@ softclock_call_cc(struct callout *c, struct callout_cpu *cc,
lastfunc = c_func;
}
#endif
KTR_STATE0(KTR_SCHED, "callout", cc->cc_ktr_event_name, "idle");
CTR1(KTR_CALLOUT, "callout %p finished", c);
if ((c_flags & CALLOUT_RETURNUNLOCKED) == 0)
class->lc_unlock(c_lock);

3
tools/sched/schedgraph.py
View File

@ -80,8 +80,6 @@ eventcolors = [
("runq rem", "yellow"),
("thread exit", "grey"),
("proc exit", "grey"),
("callwheel idle", "grey"),
("callout running", "green"),
("lock acquire", "blue"),
("lock contest", "purple"),
("failed lock try", "red"),
@ -903,7 +901,6 @@ class KTRFile:
self.timestamp_f = None
self.timestamp_l = None
self.locks = {}
self.callwheels = {}
self.ticks = {}
self.load = {}
self.crit = {}