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Date: Thu, 19 Jan 2012 14:43:58 +0100 From: Michal Hocko <mhocko@...e.cz> To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> Cc: "linux-mm@...ck.org" <linux-mm@...ck.org>, "hannes@...xchg.org" <hannes@...xchg.org>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Hugh Dickins <hughd@...gle.com>, Ying Han <yinghan@...gle.com> Subject: Re: [PATCH] memcg: remove PCG_CACHE page_cgroup flag On Thu 19-01-12 18:17:11, KAMEZAWA Hiroyuki wrote: > This patch is onto memcg-devel, can be applied to linux-next, too. Just for record memcg-devel tree should _always_ be compatible with linux-next. It just contains patches which are memcg related to be more stable for memcg specific development. > > == > From 529653c266b0682894d64e4797fcaf6a3c35db25 Mon Sep 17 00:00:00 2001 > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> > Date: Thu, 19 Jan 2012 17:09:41 +0900 > Subject: [PATCH] memcg: remove PCG_CACHE > > We record 'the page is cache' by PCG_CACHE bit to page_cgroup. > Here, "CACHE" means anonymous user pages (and SwapCache). This > doesn't include shmem. > Consdering callers, at charge/uncharge, the caller should know > what the page is and we don't need to record it by using 1bit > per page. > > This patch removes PCG_CACHE bit and make callers of > mem_cgroup_charge_statistics() to specify what the page is. > > Changelog since RFC. > - rebased onto memcg-devel > - rename 'file' to 'not_rss' The name is confusing. Other than that the patch looks reasonable. Minor comment bellow: > - some cleanup and added comment. > > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> > --- > include/linux/page_cgroup.h | 8 +----- > mm/memcontrol.c | 55 ++++++++++++++++++++++++++---------------- > 2 files changed, 35 insertions(+), 28 deletions(-) > [...] > diff --git a/mm/memcontrol.c b/mm/memcontrol.c > index fb2dfc3..de7721d 100644 > --- a/mm/memcontrol.c > +++ b/mm/memcontrol.c [...] > @@ -2908,9 +2915,15 @@ void mem_cgroup_uncharge_page(struct page *page) > > void mem_cgroup_uncharge_cache_page(struct page *page) > { > + int ctype; > + > VM_BUG_ON(page_mapped(page)); > VM_BUG_ON(page->mapping); > - __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_CACHE); > + if (page_is_file_cache(page)) > + ctype = MEM_CGROUP_CHARGE_TYPE_CACHE; > + else > + ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM; > + __mem_cgroup_uncharge_common(page, ctype); OK, this makes sense but doesn't make any real difference now, so it is more a clean up, right? Thanks -- Michal Hocko SUSE Labs SUSE LINUX s.r.o. Lihovarska 1060/12 190 00 Praha 9 Czech Republic -- 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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