From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx183.postini.com [74.125.245.183]) by kanga.kvack.org (Postfix) with SMTP id 0FC276B0072 for ; Tue, 10 Jul 2012 09:40:03 -0400 (EDT) Date: Tue, 10 Jul 2012 15:39:58 +0200 From: Michal Hocko Subject: Re: [PATCH RFC] mm/hugetlb_cgroup: Add huge_page_order check to avoid incorrectly uncharge Message-ID: <20120710133958.GA20833@tiehlicka.suse.cz> References: <1341914712-4588-1-git-send-email-liwp.linux@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1341914712-4588-1-git-send-email-liwp.linux@gmail.com> Sender: owner-linux-mm@kvack.org List-ID: To: Wanpeng Li Cc: linux-mm@kvack.org, Andrew Morton , Li Zefan , Tejun Heo , "Aneesh Kumar K.V" , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org On Tue 10-07-12 18:05:12, Wanpeng Li wrote: > From: Wanpeng Li > > Against linux-next: > > Function alloc_huge_page will call hugetlb_cgroup_charge_cgroup > to charge pages, the compound page have less than 3 pages will not > charge to hugetlb cgroup. When alloc_huge_page fails it will call > hugetlb_cgroup_uncharge_cgroup to uncharge pages, however, > hugetlb_cgroup_uncharge_cgroup doesn't have huge_page_order check. > That means it will uncharge pages even if the compound page have less > than 3 pages. Add huge_page_order check to avoid this incorrectly > uncharge. > > Signed-off-by: Wanpeng Li Reviewed-by: Michal Hocko > --- > mm/hugetlb_cgroup.c | 3 +++ > 1 files changed, 3 insertions(+), 0 deletions(-) > > diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c > index b834e8d..2b9e214 100644 > --- a/mm/hugetlb_cgroup.c > +++ b/mm/hugetlb_cgroup.c > @@ -252,6 +252,9 @@ void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, > > if (hugetlb_cgroup_disabled() || !h_cg) > return; > + > + if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER) > + return; > > res_counter_uncharge(&h_cg->hugepage[idx], csize); > return; > -- > 1.7.5.4 > > -- > To unsubscribe from this list: send the line "unsubscribe cgroups" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Michal Hocko SUSE Labs SUSE LINUX s.r.o. Lihovarska 1060/12 190 00 Praha 9 Czech Republic -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org