Messages in this thread | | | Date | Fri, 20 Jan 2012 09:29:28 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [PATCH] memcg: remove unnecessary thp check at page stat accounting |
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On Thu, 19 Jan 2012 10:34:10 +0100 Michal Hocko <mhocko@suse.cz> wrote:
> On Thu 19-01-12 16:14:45, KAMEZAWA Hiroyuki wrote: > > Thank you very much for reviewing previous RFC series. > > This is a patch against memcg-devel and linux-next (can by applied without HUNKs). > > > > == > > > > From 64641b360839b029bb353fbd95f7554cc806ed05 Mon Sep 17 00:00:00 2001 > > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> > > Date: Thu, 12 Jan 2012 16:08:33 +0900 > > Subject: [PATCH] memcg: remove unnecessary thp check in mem_cgroup_update_page_stat() > > > > commit 58b318ecf(memcg-devel) > > memcg: make mem_cgroup_split_huge_fixup() more efficient > > removes move_lock_page_cgroup() in thp-split path. > > I wouldn't refer to something which will change its commit id by its > SHA. I guess the subject is sufficient.
> Btw. do we really need to > mention this? Is it just to make sure that this doesn't get merged > withtout the mentioned patch? >
Hmm, ok. Yes, just informing this patch depends on that patch.
> > So, We do not have to check PageTransHuge in mem_cgroup_update_page_stat > > and fallback into the locked accounting because both move charge and thp > > split up are done with compound_lock so they cannot race. update vs. > > move is protected by the mem_cgroup_stealed sufficiently. > > > > PageTransHuge pages shouldn't appear in this code path currently because > > we are tracking only file pages at the moment but later we are planning > > to track also other pages (e.g. mlocked ones). > > > > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> > > Other than that > Acked-by: Michal Hocko <mhocko@suse.cz> > Thank you.
-Kame
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