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| author | James Peach <jpeach@samba.org> | 2006-05-08 03:20:49 +0000 |
|---|---|---|
| committer | Gerald (Jerry) Carter <jerry@samba.org> | 2007-10-10 11:16:55 -0500 |
| commit | 826614ed16e0fb23d30305990dbfa357b4366de2 (patch) | |
| tree | 924ca53959929f394ca662b9385280c10e7610c9 /source3/profile | |
| parent | 256690098256dc5205ae246ff49de10324defdf6 (diff) | |
| download | samba-826614ed16e0fb23d30305990dbfa357b4366de2.tar.gz samba-826614ed16e0fb23d30305990dbfa357b4366de2.tar.bz2 samba-826614ed16e0fb23d30305990dbfa357b4366de2.zip | |
r15508: Use clock_gettime for profiling timstamps if it is available. Use
the fastest clock available on uniprocessors.
(This used to be commit d44862928206b524f826bd7c2997ab5353c0b6a0)
Diffstat (limited to 'source3/profile')
| -rw-r--r-- | source3/profile/profile.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/source3/profile/profile.c b/source3/profile/profile.c index db8a643042..bacf00eb01 100644 --- a/source3/profile/profile.c +++ b/source3/profile/profile.c @@ -28,6 +28,9 @@ #ifdef WITH_PROFILE static int shm_id; static BOOL read_only; +#if defined(HAVE_CLOCK_GETTIME) +clockid_t __profile_clock; +#endif #endif struct profile_header *profile_h; @@ -103,6 +106,24 @@ BOOL profile_setup(BOOL rdonly) read_only = rdonly; +#if defined(HAVE_CLOCK_GETTIME) + if (this_is_smp()) { + /* This is faster that gettimeofday, but not fast enough to + * leave it enabled in production. + */ + __profile_clock = CLOCK_MONOTONIC; + } else { + /* CLOCK_PROCESS_CPUTIME_ID is sufficiently fast that the + * always profiling times is plausible. Unfortunately it is + * only accurate if we can guarantee we will not be scheduled + * onto a different CPU between samples. Until there is some + * way to set processor affinity, we can only use this on + * uniprocessors. + */ + __profile_clock = CLOCK_PROCESS_CPUTIME_ID; + } +#endif + again: /* try to use an existing key */ shm_id = shmget(PROF_SHMEM_KEY, 0, 0); |