Date: Fri, 6 Feb 2015 13:58:25 +0100
From: Michal Hocko <mhocko@suse.cz>
To: Shaohua Li <shli@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>,
        "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        linux-api@vger.kernel.org, Hugh Dickins <hughd@google.com>,
        Johannes Weiner <hannes@cmpxchg.org>, Rik van Riel <riel@redhat.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Mel Gorman <mgorman@suse.de>, Jason Evans <je@fb.com>,
        zhangyanfei@cn.fujitsu.com,
        "Kirill A. Shutemov" <kirill@shutemov.name>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH v17 1/7] mm: support madvise(MADV_FREE)
Message-ID: <20150206125825.GA4498@dhcp22.suse.cz>
References: <20141127144725.GB19157@dhcp22.suse.cz>
 <20141130235652.GA10333@bbox>
 <20141202100125.GD27014@dhcp22.suse.cz>
 <20141203000026.GA30217@bbox>
 <20141203101329.GB23236@dhcp22.suse.cz>
 <20141205070816.GB3358@bbox>
 <20141205083249.GA2321@dhcp22.suse.cz>
 <54D0F9BC.4060306@gmail.com>
 <20150203234722.GB3583@blaptop>
 <20150206003311.GA2347@kernel.org>
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In-Reply-To: <20150206003311.GA2347@kernel.org>
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On Thu 05-02-15 16:33:11, Shaohua Li wrote:
[...]
> Did you think about move the MADV_FREE pages to the head of inactive LRU, so
> they can be reclaimed easily?

Yes this makes sense for pages living on the active LRU list. I would
preserve LRU ordering on the inactive list because there is no good
reason to make the operation more costly for inactive pages. On the
other hand having tons of to-be-freed pages on the active list clearly
sucks. Care to send a patch?
-- 
Michal Hocko
SUSE Labs
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