linux-kernel - Re: [PATCH v2 00/13] MADV

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Message-ID: <20151205111042.GA11598@amd>
Date:	Sat, 5 Dec 2015 12:10:42 +0100
From:	Pavel Machek <pavel@....cz>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	linux-api@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jason Evans <je@...com>, Daniel Micay <danielmicay@...il.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Shaohua Li <shli@...nel.org>, Michal Hocko <mhocko@...e.cz>,
	yalin.wang2010@...il.com
Subject: Re: [PATCH v2 00/13] MADV_FREE support

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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