linux-kernel - Re: [ 39/40] cpuset: mm: reduce large amounts of memory barrier related damage v3

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Message-ID: <20120730153806.GA29697@kroah.com>
Date:	Mon, 30 Jul 2012 08:38:06 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Cc:	Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Miao Xie <miaox@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [ 39/40] cpuset: mm: reduce large amounts of memory barrier
 related damage v3

On Mon, Jul 30, 2012 at 08:37:31AM -0700, Greg Kroah-Hartman wrote:
> On Sat, Jul 28, 2012 at 02:02:31AM -0300, Herton Ronaldo Krzesinski wrote:
> > Thanks. I saw what seems another issue now on the patch too, sorry for
> > not noticing earlier: this backport is lacking the
> > write_seqcount_{begin,end} on set_mems_allowed for the case with
> > CONFIG_CPUSETS, like in the original patch:
> > 
> >  static inline void set_mems_allowed(nodemask_t nodemask)
> >  {
> >         task_lock(current);
> > +       write_seqcount_begin(&current->mems_allowed_seq);
> >         current->mems_allowed = nodemask;
> > +       write_seqcount_end(&current->mems_allowed_seq);
> >         task_unlock(current);
> >  }
> > 
> 
> Ok, but that's not in a patch format that I can apply :(
> 
> Care to redo it so I can add it to the existing patch?

Oh nevermind, Mel already did it.

Time for more coffee...

greg k-h
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