Messages in this thread | | | From | "Kirill A. Shutemov" <> | Subject | RE: [patch] mm, thp: count thp_fault_fallback anytime thp fault fails | Date | Thu, 22 Aug 2013 14:11:48 +0300 (EEST) |
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David Rientjes wrote: > On Wed, 21 Aug 2013, Kirill A. Shutemov wrote: > > > David Rientjes wrote: > > > Currently, thp_fault_fallback in vmstat only gets incremented if a > > > hugepage allocation fails. If current's memcg hits its limit or the page > > > fault handler returns an error, it is incorrectly accounted as a > > > successful thp_fault_alloc. > > > > > > Count thp_fault_fallback anytime the page fault handler falls back to > > > using regular pages and only count thp_fault_alloc when a hugepage has > > > actually been faulted. > > > > > > Signed-off-by: David Rientjes <rientjes@google.com> > > > > It's probably a good idea, but please make the behaviour consistent in > > do_huge_pmd_wp_page() and collapse path, otherwise it doesn't make sense. > > > > The collapse path has no fallback, the allocation either succeeds or it > fails.
THP_COLLAPSE_ALLOC should be counted after successful memcg charge or even only after successful collapse.
-- Kirill A. Shutemov
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