diff options
| author | phk <phk@FreeBSD.org> | 2003-06-04 05:25:58 +0000 |
|---|---|---|
| committer | phk <phk@FreeBSD.org> | 2003-06-04 05:25:58 +0000 |
| commit | a9b8284f73dbdded9334e7fdd26f87bc17b0e835 (patch) | |
| tree | 83c7195ae295dd36a56408597209445534d27bc4 /sys | |
| parent | 56091404e85973cb405b9e03d2157364e96a4e0c (diff) | |
| download | FreeBSD-src-a9b8284f73dbdded9334e7fdd26f87bc17b0e835.zip FreeBSD-src-a9b8284f73dbdded9334e7fdd26f87bc17b0e835.tar.gz | |
Add instrumentation which tells us how much work softclock() does
per invocation.
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/kern/kern_timeout.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/sys/kern/kern_timeout.c b/sys/kern/kern_timeout.c index 34b6d8c..8d4be83 100644 --- a/sys/kern/kern_timeout.c +++ b/sys/kern/kern_timeout.c @@ -45,7 +45,17 @@ #include <sys/kernel.h> #include <sys/lock.h> #include <sys/mutex.h> - +#include <sys/sysctl.h> + +static int avg_depth; +SYSCTL_INT(_debug, OID_AUTO, to_avg_depth, CTLFLAG_RD, &avg_depth, 0, + "Average number of items examined per softclock call. Units = 1/1000"); +static int avg_gcalls; +SYSCTL_INT(_debug, OID_AUTO, to_avg_gcalls, CTLFLAG_RD, &avg_gcalls, 0, + "Average number of Giant callouts made per softclock call. Units = 1/1000"); +static int avg_mpcalls; +SYSCTL_INT(_debug, OID_AUTO, to_avg_mpcalls, CTLFLAG_RD, &avg_mpcalls, 0, + "Average number of MP callouts made per softclock call. Units = 1/1000"); /* * TODO: * allocate more timeout table slots when table overflows. @@ -133,6 +143,9 @@ softclock(void *dummy) struct callout_tailq *bucket; int curticks; int steps; /* #steps since we last allowed interrupts */ + int depth; + int mpcalls; + int gcalls; #ifdef DIAGNOSTIC struct bintime bt1, bt2; struct timespec ts2; @@ -143,6 +156,9 @@ softclock(void *dummy) #define MAX_SOFTCLOCK_STEPS 100 /* Maximum allowed value of steps. */ #endif /* MAX_SOFTCLOCK_STEPS */ + mpcalls = 0; + gcalls = 0; + depth = 0; steps = 0; mtx_lock_spin(&callout_lock); while (softticks != ticks) { @@ -155,6 +171,7 @@ softclock(void *dummy) bucket = &callwheel[curticks & callwheelmask]; c = TAILQ_FIRST(bucket); while (c) { + depth++; if (c->c_time != curticks) { c = TAILQ_NEXT(c, c_links.tqe); ++steps; @@ -187,8 +204,12 @@ softclock(void *dummy) (c->c_flags & ~CALLOUT_PENDING); } mtx_unlock_spin(&callout_lock); - if (!(c_flags & CALLOUT_MPSAFE)) + if (!(c_flags & CALLOUT_MPSAFE)) { mtx_lock(&Giant); + gcalls++; + } else { + mpcalls++; + } #ifdef DIAGNOSTIC binuptime(&bt1); #endif @@ -213,6 +234,9 @@ softclock(void *dummy) } } } + avg_depth += (depth * 1000 - avg_depth) >> 8; + avg_mpcalls += (mpcalls * 1000 - avg_mpcalls) >> 8; + avg_gcalls += (gcalls * 1000 - avg_gcalls) >> 8; nextsoftcheck = NULL; mtx_unlock_spin(&callout_lock); } |
