diff options
| author | Martin Pieuchot <mpi@cvs.openbsd.org> | 2013-03-12 09:37:17 +0000 |
|---|---|---|
| committer | Martin Pieuchot <mpi@cvs.openbsd.org> | 2013-03-12 09:37:17 +0000 |
| commit | f0edf71d0715678b64251c85b679f3192b0020d8 (patch) | |
| tree | ecfdecfd831ac54a526ebf9f664903cfddf09372 /sys/kern/kern_clock.c | |
| parent | 22d6176c7a5b0d9982db2ad3b4a2e6befb249d3b (diff) | |
Fix kernel profiling on MP systems by using per-CPU buffers and teach
kgmon(8) to deal with them, this time without public header changes.
Previously various CPUs were iterating over the same global buffer at
the same time to modify it and never ended.
This diff includes some ideas submited by Thor Simon to NetBSD via miod@.
ok deraadt@, mikeb@, haesbaert@
Diffstat (limited to 'sys/kern/kern_clock.c')
| -rw-r--r-- | sys/kern/kern_clock.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/sys/kern/kern_clock.c b/sys/kern/kern_clock.c index d7d51646c2c..7aec79d3e69 100644 --- a/sys/kern/kern_clock.c +++ b/sys/kern/kern_clock.c @@ -1,4 +1,4 @@ -/* $OpenBSD: kern_clock.c,v 1.78 2013/02/12 08:06:22 mpi Exp $ */ +/* $OpenBSD: kern_clock.c,v 1.79 2013/03/12 09:37:16 mpi Exp $ */ /* $NetBSD: kern_clock.c,v 1.34 1996/06/09 04:51:03 briggs Exp $ */ /*- @@ -421,8 +421,8 @@ statclock(struct clockframe *frame) /* * Kernel statistics are just like addupc_intr, only easier. */ - g = &_gmonparam; - if (g->state == GMON_PROF_ON) { + g = ci->ci_gmon; + if (g != NULL && g->state == GMON_PROF_ON) { i = CLKF_PC(frame) - g->lowpc; if (i < g->textsize) { i /= HISTFRACTION * sizeof(*g->kcount); |