Re: [PATCH -mm] mm,numa,mprotect: always continue after finding a stable thp page

[Sasha Levin]

On 03/11/2014 12:28 PM, Mel Gorman wrote:
> On Fri, Mar 07, 2014 at 06:27:45PM +0000, Mel Gorman wrote:
> > > This is a completely untested prototype. It rechecks pmd_trans_huge
> > > under the lock and falls through if it hit a parallel split. It's not
> > > perfect because it could decide to fall through just because there was
> > > no prot_numa work to do but it's for illustration purposes. Secondly,
> > > I noted that you are calling invalidate for every pmd range. Is that not
> > > a lot of invalidations? We could do the same by just tracking the address
> > > of the first invalidation.
> >
> > And there were other minor issues. This is still untested but Sasha,
> > can you try it out please? I discussed this with Rik on IRC for a bit and
> > reckon this should be sufficient if the correct race has been identified.
>
> Any luck with this patch Sasha? It passed basic tests here but I had not
> seen the issue trigger either.

Sorry, I've been stuck in my weekend project of getting lockdep to work with page locks :)

It takes a moment to test, so just to be sure - I should have only this last patch applied?
Without the one in the original mail?


Thanks,
Sasha
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