netdev - Re: ATA over ethernet swapping

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Message-ID: <20070809101105.GA7581@elf.ucw.cz>
Date:	Thu, 9 Aug 2007 12:11:05 +0200
From:	Pavel Machek <pavel@....cz>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Ed L. Cashin" <ecashin@...aid.com>,
	kernel list <linux-kernel@...r.kernel.org>, ak@...e.de,
	Netdev list <netdev@...r.kernel.org>
Subject: Re: ATA over ethernet swapping

Hi!

> I've been working on this for quite some time. And should post again
> soon. Please see the patches:
> 
>   http://programming.kicks-ass.net/kernel-patches/vm_deadlock/current/
> 
> For now it requires one uses SLUB, I hope that SLAB will go away (will
> save me the trouble of adding support) and I guess I ought to do SLOB
> some time (if that does stay).
> 
> You'd need the first 22 patches of that series, and then call
> sk_set_memalloc(sk) on the proper socket, and do some fiddling with the
> reconnect logic. See nfs-swapfile.patch for examples.

What do you use for testing? I set up ata over ethernet... swapping
over that should deadlock w/o your patches.

But I'm able to compile kernel (-j 10) on 128MB machine, and I tried
cat /dev/zero | grep foo to exhaust memory... and could not reproduce
the deadlock. Should I pingflood? Tweak down ammount of atomic memory
avaialable to make deadlocks easier to reproduce?
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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