linux-ext4 - Re: [RESEND][PATCH 2/3 BUG,RFC] ext3: release block-device-mapping buffer_heads which have the filesystem private data for avoiding oom-killer

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Message-ID: <492B4E48.3080000@jp.fujitsu.com>
Date:	Tue, 25 Nov 2008 10:00:56 +0900
From:	Toshiyuki Okajima <toshi.okajima@...fujitsu.com>
To:	Theodore Tso <tytso@....EDU>
CC:	akpm@...ux-foundation.org, viro@...iv.linux.org.uk, sct@...hat.com,
	adilger@....com, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [RESEND][PATCH 2/3 BUG,RFC] ext3: release block-device-mapping
 buffer_heads which have the filesystem private data for avoiding	oom-killer

Hi Ted,
Thanks for your comments.

 > Hi Toshijuki,
 >
 > My apologizes for not getting back to you sooner.  My travel schedule
Never mind.

 > has been a little crazy lately, including being in Japan last week
 > speaking at the Japan Linux Symposium.
 >
 > Your patch series looks good, but I have one comment, for the ext3 and
 > ext4 patches:
 >
 > > +	if (journal != NULL)
 > > +		return journal_try_to_free_buffers(journal, page, wait);
 > > +	else
 > > +		return try_to_free_buffers(page);
 >
 > According to the documentation for journal_try_to_free_buffers():
 >
 >  * This function returns non-zero if we wish try_to_free_buffers()
 >  * to be called. We do this if the page is releasable by try_to_free_buffers().
 >  * We also do it if the page has locked or dirty buffers and the caller wants
 >  * us to perform sync or async writeout.
I forgot reading it.

 >
 > So I think the last conditional in ext3_release_metadata() needs to be
 > changed to be like this:
 >
 > +	if ((journal != NULL) &&
 > +	    (journal_try_to_free_buffers(journal, page, wait) == 0))
 > +		return 0;
 > +	return try_to_free_buffers(page);
 >
 > A similar change should be made in the ext4 version of the patch.
 > Does that sound OK to you?
Yes.

I will make and repost a revised patch which reflects your comments later.

 >
 > Regards,
 >
 > 						- Ted

Thanks again,
Toshiyuki Okajima

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