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Message-Id: <20111130084211.15fdefbf.kamezawa.hiroyu@jp.fujitsu.com> Date: Wed, 30 Nov 2011 08:42:11 +0900 From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> To: Johannes Weiner <hannes@...xchg.org> Cc: Andrew Morton <akpm@...ux-foundation.org>, Michal Hocko <mhocko@...e.cz>, Balbir Singh <bsingharora@...il.com>, David Rientjes <rientjes@...gle.com>, Hugh Dickins <hughd@...gle.com>, cgroups@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [patch 5/7] mm: page_cgroup: check page_cgroup arrays in lookup_page_cgroup() only when necessary On Tue, 29 Nov 2011 11:52:03 +0100 Johannes Weiner <hannes@...xchg.org> wrote: > lookup_page_cgroup() is usually used only against pages that are used > in userspace. > > The exception is the CONFIG_DEBUG_VM-only memcg check from the page > allocator: it can run on pages without page_cgroup descriptors > allocated when the pages are fed into the page allocator for the first > time during boot or memory hotplug. > > Include the array check only when CONFIG_DEBUG_VM is set and save the > unnecessary check in production kernels. > > Signed-off-by: Johannes Weiner <hannes@...xchg.org> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> -- 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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