Messages in this thread Patch in this message | | | Date | Wed, 23 Dec 2009 09:06:36 GMT | From | tip-bot for Peter Zijlstra <> | Subject | [tip:sched/urgent] sched: Revert 738d2be, simplify set_task_cpu() |
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Commit-ID: 0c69774e6ce94364cfaa8bdeb18061edc414bc5a Gitweb: http://git.kernel.org/tip/0c69774e6ce94364cfaa8bdeb18061edc414bc5a Author: Peter Zijlstra <peterz@infradead.org> AuthorDate: Tue, 22 Dec 2009 15:43:19 +0100 Committer: Ingo Molnar <mingo@elte.hu> CommitDate: Wed, 23 Dec 2009 10:04:10 +0100
sched: Revert 738d2be, simplify set_task_cpu()
Effectively reverts 738d2be4301007f054541c5c4bf7fb6a361c9b3a.
As demonstrated by Eric, we really need to call __set_task_cpu() early in the fork() path to properly initialize the various task state -- specifically the cgroup state through set_task_rq().
[ we could probably fix this by explicitly calling __set_task_cpu() from sched_fork(), but lets try that for the next cycle and simply revert to the old behaviour for now. ]
Reported-by: Eric Paris <eparis@redhat.com> Tested-by: Eric Paris <eparis@redhat.com>, Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: efault@gmx.de LKML-Reference: <1261492999.4937.36.camel@laptop> Signed-off-by: Ingo Molnar <mingo@elte.hu> --- kernel/sched.c | 9 ++++----- 1 files changed, 4 insertions(+), 5 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c index 87f1f47..c535cc4 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2045,11 +2045,10 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu) trace_sched_migrate_task(p, new_cpu); - if (task_cpu(p) == new_cpu) - return; - - p->se.nr_migrations++; - perf_sw_event(PERF_COUNT_SW_CPU_MIGRATIONS, 1, 1, NULL, 0); + if (task_cpu(p) != new_cpu) { + p->se.nr_migrations++; + perf_sw_event(PERF_COUNT_SW_CPU_MIGRATIONS, 1, 1, NULL, 0); + } __set_task_cpu(p, new_cpu); }
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