linux-kernel - Re: [PATCH v4 00/16] MADV

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Message-ID: <20151125025318.GA2678@bbox>
Date:	Wed, 25 Nov 2015 11:53:18 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	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, Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH v4 00/16] MADV_FREE support

Hi Andrew,

On Tue, Nov 24, 2015 at 01:58:51PM -0800, Andrew Morton wrote:
> On Fri, 20 Nov 2015 17:02:32 +0900 Minchan Kim <minchan@...nel.org> wrote:
> 
> > I have been spent a lot of time to land MADV_FREE feature
> > by request of userland people(esp, Daniel and Jason, jemalloc guys.
> 
> A couple of things...
> 
> There's a massive and complex reject storm against Kirill's page-flags
> and thp changes.  The problems in hugetlb.c are more than I can
> reasonably fix up, sorry.  How would you feel about redoing the patches
> against next -mm?

No problem at all.

> 
> Secondly, "mm: introduce lazyfree LRU list" and "mm: support MADV_FREE
> on swapless system" are new, and require significant reviewer
> attention.  But there's so much other stuff flying around that I doubt
> if we'll get effective review.  So perhaps it would be best to shelve
> those new things and introduce them later, after the basic old
> MADV_FREE work has settled in?
> 

That's really what we(Daniel, Michael and me) want so far.
A people who is reluctant to it is Johannes who wanted to support
MADV_FREE on swapless system via new LRU from the beginning.

If Johannes is not strong against Andrew's plan, I will resend
new patchset(ie, not including new stuff) based on next -mmotm.

Hannes?
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