On Fri, 18 May 2012 09:26:05 +0200
Ingo Molnar <[email protected]> wrote:
> I'm not sure we had a usable spin_is_contended() back then, nor
> was the !PREEMPT case in my mind really.
The fact that both spin_needbreak() and spin_is_contended() can be
used outside of sched is a bit confusing.
For example, in mm/compaction.c we are using spin_is_contended(), but
in mm/memory.c spin_needbreak().
BTW, the actual users of spin_is_contended() look to be only:
mm/compaction.c
security/keys/gc.c
> ( The patch looks ugly though, in 99% of the lines it just does
> something that cond_resched_lock() itself could do. )
Please ignore the patch. I have already found a way to solve my
problem without cond_resched().
Thanks,
Takuya
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