linux-kernel - Re: [PATCH 05/17] writeback: quit throttling when signal pending

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Date:	Tue, 14 Sep 2010 18:25:22 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	kosaki.motohiro@...fujitsu.com, Neil Brown <neilb@...e.de>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Theodore Ts'o" <tytso@....edu>,
	Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mel Gorman <mel@....ul.ie>, Rik van Riel <riel@...hat.com>,
	Chris Mason <chris.mason@...cle.com>,
	Christoph Hellwig <hch@....de>,
	"Li, Shaohua" <shaohua.li@...el.com>
Subject: Re: [PATCH 05/17] writeback: quit throttling when signal pending

> > > However, I suspect the process is guaranteed to exit on
> > > fatal_signal_pending, so it won't dirty more pages :)
> > 
> > Process exiting is delayed until syscall exiting. So, we exit write syscall
> > manually if necessary.
> 
> Got it, you mean this fix. It looks good. I didn't add "status =
> -EINTR" in the patch because the bottom line "written ? : status" will
> always select the non-zero written.
> 
> diff --git a/mm/filemap.c b/mm/filemap.c
> index 3d4df44..f6d2740 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -2304,7 +2304,8 @@ again:
>  		written += copied;
>  
>  		balance_dirty_pages_ratelimited(mapping);
> -
> +		if (fatal_signal_pending(current))
> +			break;
>  	} while (iov_iter_count(i));

Looks good. however other callers also need to be updated.



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