linux-kernel - Re: [PATCH V5 4/6] mm: reclaim MADV

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Message-ID: <06f001d29171$b5469740$1fd3c5c0$@alibaba-inc.com>
Date:   Tue, 28 Feb 2017 11:21:09 +0800
From:   "Hillf Danton" <hillf.zj@...baba-inc.com>
To:     "'Shaohua Li'" <shli@...com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
Cc:     <Kernel-team@...com>, <mhocko@...e.com>, <minchan@...nel.org>,
        <hughd@...gle.com>, <hannes@...xchg.org>, <riel@...hat.com>,
        <mgorman@...hsingularity.net>, <akpm@...ux-foundation.org>
Subject: Re: [PATCH V5 4/6] mm: reclaim MADV_FREE pages


On February 25, 2017 5:32 AM Shaohua Li wrote: 
> 
> When memory pressure is high, we free MADV_FREE pages. If the pages are
> not dirty in pte, the pages could be freed immediately. Otherwise we
> can't reclaim them. We put the pages back to anonumous LRU list (by
> setting SwapBacked flag) and the pages will be reclaimed in normal
> swapout way.
> 
> We use normal page reclaim policy. Since MADV_FREE pages are put into
> inactive file list, such pages and inactive file pages are reclaimed
> according to their age. This is expected, because we don't want to
> reclaim too many MADV_FREE pages before used once pages.
> 
> Based on Minchan's original patch
> 
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Minchan Kim <minchan@...nel.org>
> Cc: Hugh Dickins <hughd@...gle.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Rik van Riel <riel@...hat.com>
> Cc: Mel Gorman <mgorman@...hsingularity.net>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Shaohua Li <shli@...com>
> ---

Acked-by: Hillf Danton <hillf.zj@...baba-inc.com>