Date: Sat, 5 Dec 2015 12:10:42 +0100
From: Pavel Machek <pavel@ucw.cz>
To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, Michael Kerrisk <mtk.manpages@gmail.com>,
        linux-api@vger.kernel.org, Hugh Dickins <hughd@google.com>,
        Johannes Weiner <hannes@cmpxchg.org>, Rik van Riel <riel@redhat.com>,
        Mel Gorman <mgorman@suse.de>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Jason Evans <je@fb.com>, Daniel Micay <danielmicay@gmail.com>,
        "Kirill A. Shutemov" <kirill@shutemov.name>,
        Shaohua Li <shli@kernel.org>, Michal Hocko <mhocko@suse.cz>,
        yalin.wang2010@gmail.com
Subject: Re: [PATCH v2 00/13] MADV_FREE support
Message-ID: <20151205111042.GA11598@amd>
References: <1446600367-7976-1-git-send-email-minchan@kernel.org>
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On Wed 2015-11-04 10:25:54, Minchan Kim wrote:
> MADV_FREE is on linux-next so long time. The reason was two, I think.
> 
> 1. MADV_FREE code on reclaim path was really mess.

Could you explain what MADV_FREE does?

Comment in code says 'free the page only when there's memory
pressure'. So I mark my caches MADV_FREE, no memory pressure, I can
keep using it? And if there's memory pressure, what happens? I get
zeros? SIGSEGV?

Thanks,
								Pavel

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