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| author | Frank Rowand <frank.rowand@am.sony.com> | 2009-11-19 13:42:06 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-06 13:20:00 +0100 |
| commit | 109d71c6dd52ec08878c2c67eb4c0bd67fcbc80b (patch) | |
| tree | 0e531ab9d3327bbc939a13e8e2991150ada9e469 /kernel/lockdep.c | |
| parent | 6ec22f9b037fc0c2e00ddb7023fad279c365324d (diff) | |
| download | lwn-109d71c6dd52ec08878c2c67eb4c0bd67fcbc80b.tar.gz lwn-109d71c6dd52ec08878c2c67eb4c0bd67fcbc80b.zip | |
lockstat: Fix min, max times in /proc/lock_stats
Fix min, max times in /proc/lock_stats
(1) When collecting lock hold and wait times, if the current minimum
time is zero, it will be replaced by the next time.
(2) When aggregating minimum and maximum lock hold and wait times
accross cpus, the values are added, instead of selecting the
minimum and maximum.
Signed-off-by: Frank Rowand <frank.rowand@am.sony.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <4B05BBAE.2050005@am.sony.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/lockdep.c')
| -rw-r--r-- | kernel/lockdep.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c index f5dcd36d3151..7a3ae56b3a7f 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -168,7 +168,7 @@ static void lock_time_inc(struct lock_time *lt, u64 time) if (time > lt->max) lt->max = time; - if (time < lt->min || !lt->min) + if (time < lt->min || !lt->nr) lt->min = time; lt->total += time; @@ -177,8 +177,15 @@ static void lock_time_inc(struct lock_time *lt, u64 time) static inline void lock_time_add(struct lock_time *src, struct lock_time *dst) { - dst->min += src->min; - dst->max += src->max; + if (!src->nr) + return; + + if (src->max > dst->max) + dst->max = src->max; + + if (src->min < dst->min || !dst->nr) + dst->min = src->min; + dst->total += src->total; dst->nr += src->nr; } |