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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2011-04-05 17:23:48 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-04-14 08:52:37 +0200 |
| commit | 3fe1698b7fe05aeb063564e71e40d09f28d8e80c (patch) | |
| tree | d068bd6a075cd85c64a040cf9fc8e661f8be00a8 /kernel/sched.c | |
| parent | sched: Remove rq argument to sched_class::task_waking() (diff) | |
| download | linux-3fe1698b7fe05aeb063564e71e40d09f28d8e80c.tar.xz linux-3fe1698b7fe05aeb063564e71e40d09f28d8e80c.zip | |
sched: Deal with non-atomic min_vruntime reads on 32bits
In order to avoid reading partial updated min_vruntime values on 32bit
implement a seqcount like solution.
Reviewed-by: Frank Rowand <frank.rowand@am.sony.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20110405152729.111378493@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 46f42cac4eb1..7a5eb2620785 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -312,6 +312,9 @@ struct cfs_rq { u64 exec_clock; u64 min_vruntime; +#ifndef CONFIG_64BIT + u64 min_vruntime_copy; +#endif struct rb_root tasks_timeline; struct rb_node *rb_leftmost; |