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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