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Reply-To: "Hillf Danton" <hillf.zj@alibaba-inc.com>
From: "Hillf Danton" <hillf.zj@alibaba-inc.com>
To: "'Shaohua Li'" <shli@fb.com>, <linux-mm@kvack.org>,
        <linux-kernel@vger.kernel.org>
Cc: <Kernel-team@fb.com>, <mhocko@suse.com>, <minchan@kernel.org>,
        <hughd@google.com>, <hannes@cmpxchg.org>, <riel@redhat.com>,
        <mgorman@techsingularity.net>, <akpm@linux-foundation.org>
References: <cover.1487965799.git.shli@fb.com> <14b8eb1d3f6bf6cc492833f183ac8c304e560484.1487965799.git.shli@fb.com>
In-Reply-To: <14b8eb1d3f6bf6cc492833f183ac8c304e560484.1487965799.git.shli@fb.com>
Subject: Re: [PATCH V5 4/6] mm: reclaim MADV_FREE pages
Date: Tue, 28 Feb 2017 11:21:09 +0800
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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@suse.com>
> Cc: Minchan Kim <minchan@kernel.org>
> Cc: Hugh Dickins <hughd@google.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Rik van Riel <riel@redhat.com>
> Cc: Mel Gorman <mgorman@techsingularity.net>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Signed-off-by: Shaohua Li <shli@fb.com>
> ---

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