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Open Source and information security mailing list archives
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Date: Mon, 16 Jan 2012 14:43:08 +0200 From: "Kirill A. Shutemov" <kirill@...temov.name> To: Johannes Weiner <hannes@...xchg.org> Cc: Andrew Morton <akpm@...ux-foundation.org>, Hugh Dickins <hughd@...gle.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [patch] mm: memcg: update the correct soft limit tree during migration On Fri, Jan 13, 2012 at 04:41:31PM +0100, Johannes Weiner wrote: > end_migration() passes the old page instead of the new page to commit > the charge. This page descriptor is not used for committing itself, > though, since we also pass the (correct) page_cgroup descriptor. But > it's used to find the soft limit tree through the page's zone, so the > soft limit tree of the old page's zone is updated instead of that of > the new page's, which might get slightly out of date until the next > charge reaches the ratelimit point. > > This glitch has been present since '5564e88 memcg: condense > page_cgroup-to-page lookup points'. > > Reported-by: Hugh Dickins <hughd@...gle.com> > Signed-off-by: Johannes Weiner <hannes@...xchg.org> Acked-by: Kirill A. Shutemov <kirill@...temov.name> -- Kirill A. Shutemov -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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