Say Evgeniy, something I was curious about but forgot to ask you
earlier...
On Wednesday 08 August 2007 03:17, Evgeniy Polyakov wrote:
> ...All oerations are not atomic, since we do not care about precise
> number of bios, but a fact, that we are close or close enough to the
> limit.
> ... in bio->endio
> + q->bio_queued--;
In your proposed patch, what prevents the race:
cpu1 cpu2
read q->bio_queued
q->bio_queued--
write q->bio_queued - 1
Whoops! We leaked a throttle count.
Regards,
Daniel
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