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

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Message-ID: <alpine.DEB.1.00.0801290028460.16707@asgard.lang.hm>
Date:	Tue, 29 Jan 2008 00:29:28 -0800 (PST)
From:	david@...g.hm
To:	Theodore Tso <tytso@....EDU>
cc:	Pavel Machek <pavel@....cz>, 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, 28 Jan 2008, Theodore Tso wrote:

> 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....

not to mention machines with 1G of ram (900M lowmem, 128M highmem)

David Lang
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