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Date: Thu, 16 Nov 2017 09:44:57 +0900 From: Minchan Kim <minchan@...nel.org> To: Michal Hocko <mhocko@...nel.org> Cc: Wang Nan <wangnan0@...wei.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, will.deacon@....com, Bob Liu <liubo95@...wei.com>, Andrew Morton <akpm@...ux-foundation.org>, David Rientjes <rientjes@...gle.com>, Ingo Molnar <mingo@...nel.org>, Roman Gushchin <guro@...com>, Konstantin Khlebnikov <khlebnikov@...dex-team.ru>, Andrea Arcangeli <aarcange@...hat.com> Subject: Re: [PATCH] arch, mm: introduce arch_tlb_gather_mmu_lazy (was: Re: [RESEND PATCH] mm, oom_reaper: gather each vma to prevent) leaking TLB entry On Wed, Nov 15, 2017 at 09:14:52AM +0100, Michal Hocko wrote: > On Mon 13-11-17 09:28:33, Minchan Kim wrote: > [...] > > void arch_tlb_gather_mmu(...) > > > > tlb->fullmm = !(start | (end + 1)) && atomic_read(&mm->mm_users) == 0; > > Sorry, I should have realized sooner but this will not work for the oom > reaper. It _can_ race with the final exit_mmap and run with mm_users == 0 If someone see mm_users is zero, it means there is no user to access address space by stale TLB. Am I missing something?
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