diff options
author | Thomas Gleixner <tglx@linutronix.de> | 2007-02-28 23:12:19 -0500 |
---|---|---|
committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-01 17:53:37 -0500 |
commit | c1e16aa2792a129d8920e22210ef21eb62a0f80a (patch) | |
tree | bb924b7c77760d01aae19bc6caf1d24869b25e41 /kernel | |
parent | ae73fc093a8cae4d92e22ab8b635e3590e80785d (diff) |
[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')
-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: | |||
3566 | 3566 | ||
3567 | sched_info_switch(prev, next); | 3567 | sched_info_switch(prev, next); |
3568 | if (likely(prev != next)) { | 3568 | if (likely(prev != next)) { |
3569 | next->timestamp = now; | 3569 | next->timestamp = next->last_ran = now; |
3570 | rq->nr_switches++; | 3570 | rq->nr_switches++; |
3571 | rq->curr = next; | 3571 | rq->curr = next; |
3572 | ++*switch_count; | 3572 | ++*switch_count; |