On Thu 16-07-15 00:30:27, Dave Hansen wrote:
> On 07/16/2015 12:26 AM, Jan Kara wrote:
> > So Dave's patches would go in only in the next merge window anyway so we
> > still have like two-three weeks to decide which patchset to take. If you
> > think it will take you longer, then merging Dave's patches makes some sense
> > although I personally don't think the issue is so important that we have to
> > fix it ASAP and eventual delay of one more release would be OK for me.
>
> I thought of one more thing.
>
> Oleg's patches are fast in the uncontended case. My testing of his code
> so far was all single-threaded. Will it slow down if we throw a bunch
> of threads at it an see contention? I don't think my RCU approach will.
>
> I can benchmark in the next few days on a larger machine.
Well, his semaphore is percpu as well so I don't think there should be a
difference (there may be some difference when freeze is in progress but
that doesn't really matter). But it's always good to verify.
Honza
--
Jan Kara <j...@suse.cz>
SUSE Labs, CR
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