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

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Date:	Thu, 16 Feb 2012 14:50:47 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Jan Kara <jack@...e.cz>
Cc:	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, 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.
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