linux-kernel - Re: [RFC][PATCH 00/11] track files for checkpointability

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Message-ID: <20090310162026.GA9354@us.ibm.com>
Date:	Tue, 10 Mar 2009 11:20:26 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Nathan Lynch <ntl@...ox.com>
Cc:	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Alexey@...p1.linux-foundation.org,
	containers <containers@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, Dobriyan <adobriyan@...il.com>
Subject: Re: [RFC][PATCH 00/11] track files for checkpointability

Quoting Nathan Lynch (ntl@...ox.com):
> Please consider this and a following patch.
> 
> >From a0fb96aa41c4d360559013cfd7f32f07f449c1c4 Mon Sep 17 00:00:00 2001
> From: Nathan Lynch <ntl@...ox.com>
> Date: Mon, 9 Mar 2009 22:23:02 -0500
> Subject: [PATCH] checkpoint: make files_deny_checkpointing print task name and pid
> 
> This lets the developer know *which* task performed an action that
> prevents checkpoint.
> 
> 
> Signed-off-by: Nathan Lynch <ntl@...ox.com>
> ---
>  fs/file.c                  |    2 +-
>  fs/open.c                  |    2 +-
>  include/linux/checkpoint.h |   13 +++++++------
>  3 files changed, 9 insertions(+), 8 deletions(-)
> 
> diff --git a/fs/file.c b/fs/file.c
> index 0501af6..fcb2803 100644
> --- a/fs/file.c
> +++ b/fs/file.c
> @@ -299,7 +299,7 @@ static void __scan_files_for_cr(struct files_struct *files)
>  			continue;
>  		if (cr_file_supported(f))
>  			continue;
> -		files_deny_checkpointing(files);
> +		files_deny_checkpointing(current, files);

Ah but you can't do this, because __scan_files_for_cr is called
from dupfd which is called during copy_files, right?

So you'll need to send the task into __scan_files_for_cr, right?

I do wholeheartedly agree with the idea though.

thanks,
-serge
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