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DateTue, 5 Jan 2010 20:20:56 -0800 (PST)
FromLinus Torvalds <>
SubjectRe: [RFC][PATCH 6/8] mm: handle_speculative_fault()


On Wed, 6 Jan 2010, KAMEZAWA Hiroyuki wrote:
> >
> > Of course, your other load with MADV_DONTNEED seems to be horrible, and
> > has some nasty spinlock issues, but that looks like a separate deal (I
> > assume that load is just very hard on the pgtable lock).
>
> It's zone->lock, I guess. My test program avoids pgtable lock problem.

Yeah, I should have looked more at your callchain. That's nasty. Much
worse than the per-mm lock. I thought the page buffering would avoid the
zone lock becoming a huge problem, but clearly not in this case.

Linus


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