From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f175.google.com (mail-wi0-f175.google.com [209.85.212.175]) by kanga.kvack.org (Postfix) with ESMTP id 097496B0253 for ; Tue, 25 Aug 2015 11:06:40 -0400 (EDT) Received: by wicja10 with SMTP id ja10so17867366wic.1 for ; Tue, 25 Aug 2015 08:06:39 -0700 (PDT) Received: from mail-wi0-f173.google.com (mail-wi0-f173.google.com. [209.85.212.173]) by mx.google.com with ESMTPS id og6si3744310wic.45.2015.08.25.08.06.35 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 25 Aug 2015 08:06:36 -0700 (PDT) Received: by wicja10 with SMTP id ja10so18061267wic.1 for ; Tue, 25 Aug 2015 08:06:35 -0700 (PDT) Date: Tue, 25 Aug 2015 17:06:33 +0200 From: Michal Hocko Subject: Re: [PATCH 2/2] Documentation: clarify in calculating zone protection Message-ID: <20150825150633.GG6285@dhcp22.suse.cz> References: <1440511291-3990-1-git-send-email-bywxiaobai@163.com> <1440511291-3990-2-git-send-email-bywxiaobai@163.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1440511291-3990-2-git-send-email-bywxiaobai@163.com> Sender: owner-linux-mm@kvack.org List-ID: To: Yaowei Bai Cc: akpm@linux-foundation.org, mgorman@suse.de, vbabka@suse.cz, js1304@gmail.com, hannes@cmpxchg.org, alexander.h.duyck@redhat.com, sasha.levin@oracle.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org On Tue 25-08-15 22:01:31, Yaowei Bai wrote: > Every zone's protection is calculated from managed_pages not > present_pages, to avoid misleading, correct it. This can be folded in to your previous patch http://marc.info/?l=linux-mm&m=144023106610358&w=2 > > Signed-off-by: Yaowei Bai > --- > Documentation/sysctl/vm.txt | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt > index 9832ec5..1739b31 100644 > --- a/Documentation/sysctl/vm.txt > +++ b/Documentation/sysctl/vm.txt > @@ -349,7 +349,7 @@ zone[i]'s protection[j] is calculated by following expression. > > (i < j): > zone[i]->protection[j] > - = (total sums of present_pages from zone[i+1] to zone[j] on the node) > + = (total sums of managed_pages from zone[i+1] to zone[j] on the node) > / lowmem_reserve_ratio[i]; > (i = j): > (should not be protected. = 0; > @@ -360,7 +360,7 @@ The default values of lowmem_reserve_ratio[i] are > 256 (if zone[i] means DMA or DMA32 zone) > 32 (others). > As above expression, they are reciprocal number of ratio. > -256 means 1/256. # of protection pages becomes about "0.39%" of total present > +256 means 1/256. # of protection pages becomes about "0.39%" of total managed > pages of higher zones on the node. > > If you would like to protect more pages, smaller values are effective. > -- > 1.9.1 > > > -- > 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/ -- Michal Hocko SUSE Labs -- 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