linux-kernel - Re: [PATCH 3/3] mm, thp: make swapin readahead under down_read of mmap

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Message-ID: <20160523184246.GE32715@dhcp22.suse.cz>
Date:	Mon, 23 May 2016 20:42:46 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Ebru Akagunduz <ebru.akagunduz@...il.com>
Cc:	linux-mm@...ck.org, hughd@...gle.com, riel@...hat.com,
	akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
	n-horiguchi@...jp.nec.com, aarcange@...hat.com,
	iamjoonsoo.kim@....com, gorcunov@...nvz.org,
	linux-kernel@...r.kernel.org, mgorman@...e.de, rientjes@...gle.com,
	vbabka@...e.cz, aneesh.kumar@...ux.vnet.ibm.com,
	hannes@...xchg.org, boaz@...xistor.com
Subject: Re: [PATCH 3/3] mm, thp: make swapin readahead under down_read of
 mmap_sem

On Mon 23-05-16 20:14:11, Ebru Akagunduz wrote:
> Currently khugepaged makes swapin readahead under
> down_write. This patch supplies to make swapin
> readahead under down_read instead of down_write.

You are still keeping down_write. Can we do without it altogether?
Blocking mmap_sem of a remote proces for write is certainly not nice.
-- 
Michal Hocko
SUSE Labs