linux-kernel - Re: [PATCH 1/2] MM: Make Page Tables Relocatable -- conditional flush

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Date:	Fri, 11 Apr 2008 09:49:00 -0400
From:	"Ross Biro" <rossb@...gle.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, rossb@...gle.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 1/2] MM: Make Page Tables Relocatable -- conditional flush

On Thu, Apr 10, 2008 at 1:26 PM, Ross Biro <rossb@...gle.com> wrote:
>  rcu cleanup.  There still appears to be a race, but it looks like it's
>  in the rcu code.  If I reduce the migration code to
>
>  down_interruptible()
>  synchronize_rcu()
>  up()
>
>  I still get a crash about once every 1-2 million times through the
>  loop.  If the race is in my code, it's something stupid.  Otherwise
>  it's elsewhere and my code won't make things anyworse.

This race appears to have been fixed between 2.6.25rc5-mm1 and
2.6.25rc8-mm1.  I've been running the later over night and have over 7
million iterations with out a crash.

    Ross
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