Messages in this thread | | | Date | Tue, 16 Oct 2012 12:22:34 +0900 | From | Kamezawa Hiroyuki <> | Subject | Re: [PATCH v4 02/14] memcg: Reclaim when more than one page needed. |
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(2012/10/08 19:06), Glauber Costa wrote: > From: Suleiman Souhlal <ssouhlal@FreeBSD.org> > > mem_cgroup_do_charge() was written before kmem accounting, and expects > three cases: being called for 1 page, being called for a stock of 32 > pages, or being called for a hugepage. If we call for 2 or 3 pages (and > both the stack and several slabs used in process creation are such, at > least with the debug options I had), it assumed it's being called for > stock and just retried without reclaiming. > > Fix that by passing down a minsize argument in addition to the csize. > > And what to do about that (csize == PAGE_SIZE && ret) retry? If it's > needed at all (and presumably is since it's there, perhaps to handle > races), then it should be extended to more than PAGE_SIZE, yet how far? > And should there be a retry count limit, of what? For now retry up to > COSTLY_ORDER (as page_alloc.c does) and make sure not to do it if > __GFP_NORETRY. > > [v4: fixed nr pages calculation pointed out by Christoph Lameter ] > > Signed-off-by: Suleiman Souhlal <suleiman@google.com> > Signed-off-by: Glauber Costa <glommer@parallels.com> > Reviewed-by: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> > Acked-by: Michal Hocko <mhocko@suse.cz> > Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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