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| author | Thomas Gleixner <tglx@linutronix.de> | 2007-02-28 20:12:19 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-01 14:53:37 -0800 |
| commit | c1e16aa2792a129d8920e22210ef21eb62a0f80a (patch) | |
| tree | bb924b7c77760d01aae19bc6caf1d24869b25e41 /kernel/sched.c | |
| parent | ae73fc093a8cae4d92e22ab8b635e3590e80785d (diff) | |
| download | linux-c1e16aa2792a129d8920e22210ef21eb62a0f80a.tar.gz linux-c1e16aa2792a129d8920e22210ef21eb62a0f80a.tar.bz2 linux-c1e16aa2792a129d8920e22210ef21eb62a0f80a.zip | |
[PATCH] Fix posix-cpu-timer breakage caused by stale p->last_ran value
Problem description at:
http://bugzilla.kernel.org/show_bug.cgi?id=8048
Commit b18ec80396834497933d77b81ec0918519f4e2a7
[PATCH] sched: improve migration accuracy
optimized the scheduler time calculations, but broke posix-cpu-timers.
The problem is that the p->last_ran value is not updated after a context
switch. So a subsequent call to current_sched_time() calculates with a
stale p->last_ran value, i.e. accounts the full time, which the task was
scheduled away.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 0dc757246d89..0c5ebf59b8bc 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3566,7 +3566,7 @@ switch_tasks: sched_info_switch(prev, next); if (likely(prev != next)) { - next->timestamp = now; + next->timestamp = next->last_ran = now; rq->nr_switches++; rq->curr = next; ++*switch_count; |