Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752472Ab2FLIyA (ORCPT ); Tue, 12 Jun 2012 04:54:00 -0400 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:40690 "EHLO fgwmail6.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752272Ab2FLIx6 (ORCPT ); Tue, 12 Jun 2012 04:53:58 -0400 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <4FD70329.4080009@jp.fujitsu.com> Date: Tue, 12 Jun 2012 17:51:53 +0900 From: Kamezawa Hiroyuki User-Agent: Mozilla/5.0 (Windows NT 6.0; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: "Aneesh Kumar K.V" CC: linux-mm@kvack.org, dhillf@gmail.com, rientjes@google.com, mhocko@suse.cz, akpm@linux-foundation.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org Subject: Re: [PATCH -V8 15/16] hugetlb/cgroup: migrate hugetlb cgroup info from oldpage to new page during migration References: <1339232401-14392-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> <1339232401-14392-16-git-send-email-aneesh.kumar@linux.vnet.ibm.com> In-Reply-To: <1339232401-14392-16-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2719 Lines: 82 (2012/06/09 18:00), Aneesh Kumar K.V wrote: > From: "Aneesh Kumar K.V" > > With HugeTLB pages, hugetlb cgroup is uncharged in compound page destructor. Since > we are holding a hugepage reference, we can be sure that old page won't > get uncharged till the last put_page(). > > Signed-off-by: Aneesh Kumar K.V one comment. > --- > include/linux/hugetlb_cgroup.h | 8 ++++++++ > mm/hugetlb_cgroup.c | 21 +++++++++++++++++++++ > mm/migrate.c | 5 +++++ > 3 files changed, 34 insertions(+) > > diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h > index ba4836f..b64d067 100644 > --- a/include/linux/hugetlb_cgroup.h > +++ b/include/linux/hugetlb_cgroup.h > @@ -63,6 +63,8 @@ extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, > extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, > struct hugetlb_cgroup *h_cg); > extern int hugetlb_cgroup_file_init(int idx) __init; > +extern void hugetlb_cgroup_migrate(struct page *oldhpage, > + struct page *newhpage); > #else > static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page) > { > @@ -112,5 +114,11 @@ static inline int __init hugetlb_cgroup_file_init(int idx) > { > return 0; > } > + > +static inline void hugetlb_cgroup_migrate(struct page *oldhpage, > + struct page *newhpage) > +{ > + return; > +} > #endif /* CONFIG_MEM_RES_CTLR_HUGETLB */ > #endif > diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c > index c2b7b8e..2d384fe 100644 > --- a/mm/hugetlb_cgroup.c > +++ b/mm/hugetlb_cgroup.c > @@ -394,6 +394,27 @@ int __init hugetlb_cgroup_file_init(int idx) > return 0; > } > > +void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage) > +{ > + struct hugetlb_cgroup *h_cg; > + > + VM_BUG_ON(!PageHuge(oldhpage)); > + > + if (hugetlb_cgroup_disabled()) > + return; > + > + spin_lock(&hugetlb_lock); > + h_cg = hugetlb_cgroup_from_page(oldhpage); > + set_hugetlb_cgroup(oldhpage, NULL); > + cgroup_exclude_rmdir(&h_cg->css); > + > + /* move the h_cg details to new cgroup */ > + set_hugetlb_cgroup(newhpage, h_cg); > + spin_unlock(&hugetlb_lock); > + cgroup_release_and_wakeup_rmdir(&h_cg->css); > + return; Why do you need cgroup_exclude/release rmdir here ? you holds hugetlb_lock() and charges will not be empty, here. Thanks, -Kame -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/