linux-ext4 - Re: [RFC] Parallelize IO for e2fsck

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Message-ID: <20080128195633.GB20528@mit.edu>
Date:	Mon, 28 Jan 2008 14:56:33 -0500
From:	Theodore Tso <tytso@....EDU>
To:	Pavel Machek <pavel@....cz>
Cc:	Valdis.Kletnieks@...edu, David Chinner <dgc@....com>,
	Valerie Henson <val@...consulting.com>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andreas Dilger <adilger@...sterfs.com>,
	Ric Wheeler <ric@....com>
Subject: Re: [RFC] Parallelize IO for e2fsck

On Mon, Jan 28, 2008 at 07:30:05PM +0000, Pavel Machek wrote:
> 
> As user pages are always in highmem, this should be easy to decide:
> only send SIGDANGER when highmem is full. (Yes, there are
> inodes/dentries/file descriptors in lowmem, but I doubt apps will
> respond to SIGDANGER by closing files).

Good point; for a system with at least (say) 2GB of memory, that
definitely makes sense.  For a system with less than 768 megs of
memory (how quaint, but it wasn't that long ago this was a lot of
memory :-), there wouldn't *be* any memory in highmem at all....

	       		     	 	- Ted
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