linux-kernel - Re: [PATCH 01/11] perf: Push file_update_time() into perf_mmap

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Message-ID: <20120220223313.GD32708@quack.suse.cz>
Date:	Mon, 20 Feb 2012 23:33:13 +0100
From:	Jan Kara <jack@...e.cz>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Jan Kara <jack@...e.cz>, LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Sandeen <sandeen@...hat.com>,
	Dave Chinner <david@...morbit.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH 01/11] perf: Push file_update_time() into
 perf_mmap_fault()

On Thu 16-02-12 14:50:47, Peter Zijlstra wrote:
> On Thu, 2012-02-16 at 14:46 +0100, Jan Kara wrote:
> > CC: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > CC: Ingo Molnar <mingo@...e.hu>
> > CC: Paul Mackerras <paulus@...ba.org>
> > CC: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> > Signed-off-by: Jan Kara <jack@...e.cz>
> > ---
> >  kernel/events/core.c |    4 +++-
> >  1 files changed, 3 insertions(+), 1 deletions(-)
> > 
> > diff --git a/kernel/events/core.c b/kernel/events/core.c
> > index ba36013..61a67f3 100644
> > --- a/kernel/events/core.c
> > +++ b/kernel/events/core.c
> > @@ -3316,8 +3316,10 @@ static int perf_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
> >  	int ret = VM_FAULT_SIGBUS;
> >  
> >  	if (vmf->flags & FAULT_FLAG_MKWRITE) {
> > -		if (vmf->pgoff == 0)
> > +		if (vmf->pgoff == 0) {
> >  			ret = 0;
> > +			file_update_time(vma->vm_file);
> > +		}
> >  		return ret;
> >  	}
> 
> Its an anon filedesc, there's no actual file and while I guess one could
> probably call fstat() on it, people really shouldn't care.
> 
> So feel free to introduce this patch to the bitbucket.
  Thanks for letting me know. Patch removed.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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