linux-kernel - Re: [PATCH 0/4] per anon_vma lock and turn anon_vma rwsem lock to rwlock

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Date:	Fri, 1 Nov 2013 11:09:15 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Davidlohr Bueso <davidlohr@...com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Michel Lespinasse <walken@...gle.com>
Subject: Re: [PATCH 0/4] per anon_vma lock and turn anon_vma rwsem lock to rwlock_t

On Fri, Nov 1, 2013 at 10:49 AM, Davidlohr Bueso <davidlohr@...com> wrote:
>
> Andrea's last input from this kind of conversion is that it cannot be
> done (at least yet): https://lkml.org/lkml/2013/9/30/53

No, none of the invalidate_page users really need to sleep. If doing
this makes some people not do stupid sh*t, then that's all good. So at
least _that_ worry was a false alarm. We definitely don't want to
support crap in the VM, and sleeping during teardown is crap.

                Linus
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