linux-kernel - Re: [PATCH 0/11] introduce down_write_killable for rw

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Message-ID: <20160331085926.GB27831@dhcp22.suse.cz>
Date:	Thu, 31 Mar 2016 10:59:26 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"David S. Miller" <davem@...emloft.net>,
	Tony Luck <tony.luck@...el.com>,
	Chris Zankel <chris@...kel.net>,
	Max Filippov <jcmvbkbc@...il.com>, x86@...nel.org,
	linux-alpha@...r.kernel.org, linux-ia64@...r.kernel.org,
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
	sparclinux@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 0/11] introduce down_write_killable for rw_semaphore

On Wed 30-03-16 15:32:17, Peter Zijlstra wrote:
> On Mon, Feb 29, 2016 at 01:58:14PM +0100, Michal Hocko wrote:
> > I have tested on x86 with OOM situations with high mmap_sem contention
> > (basically many parallel page faults racing with many parallel mmap/munmap
> > tight loops) so the waiters for the write locks are routinely interrupted
> > by SIGKILL.
> 
> Aside from the one niggle (as per the other email) they look good to me
> and I would take them through the tip/locking tree.

Thanks for the review! I understand that tip/locking would be the most
appropriate place but I am wondering whether this causes some issues
with the follow up patches which use this new API and which I expect to
go via Andrew's tree.

That being said I do not care much but then we have a potential
dependency between mmotm and tip/locking.

-- 
Michal Hocko
SUSE Labs