linux-kernel - Re: [PATCH 3/7] mm, vmscan: show the number of skipped pages in mm_vmscan_lru

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Message-ID: <06d701d261a8$20082390$60186ab0$@alibaba-inc.com>
Date:   Thu, 29 Dec 2016 15:49:45 +0800
From:   "Hillf Danton" <hillf.zj@...baba-inc.com>
To:     "'Michal Hocko'" <mhocko@...nel.org>, <linux-mm@...ck.org>
Cc:     "'Andrew Morton'" <akpm@...ux-foundation.org>,
        "'Mel Gorman'" <mgorman@...e.de>,
        "'Johannes Weiner'" <hannes@...xchg.org>,
        "'Vlastimil Babka'" <vbabka@...e.cz>,
        "'Rik van Riel'" <riel@...hat.com>,
        "'LKML'" <linux-kernel@...r.kernel.org>,
        "'Michal Hocko'" <mhocko@...e.com>
Subject: Re: [PATCH 3/7] mm, vmscan: show the number of skipped pages in mm_vmscan_lru_isolate

On Wednesday, December 28, 2016 11:30 PM Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.com>
> 
> mm_vmscan_lru_isolate shows the number of requested, scanned and taken
> pages. This is mostly OK but on 32b systems the number of scanned pages
> is quite misleading because it includes both the scanned and skipped
> pages.  Moreover the skipped part is scaled based on the number of taken
> pages. Let's report the exact numbers without any additional logic and
> add the number of skipped pages. This should make the reported data much
> more easier to interpret.
> 
> Signed-off-by: Michal Hocko <mhocko@...e.com>
> ---
Acked-by: Hillf Danton <hillf.zj@...baba-inc.com>