linux-kernel - Re: [GIT PULL v2] Early SLAB fixes for 2.6.31

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Message-Id: <1244843163.23936.2.camel@pasglop>
Date:	Sat, 13 Jun 2009 07:46:03 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Pekka J Enberg <penberg@...helsinki.fi>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, kamezawa.hiroyu@...fujitsu.com,
	lizf@...fujitsu.com, mingo@...e.hu, npiggin@...e.de,
	yinghai@...nel.org
Subject: Re: [GIT PULL v2] Early SLAB fixes for 2.6.31


> Adds code to hot code path.

A single mask which should be mostly in the noise...

> The allocators mask flags passed to the page allocator through
> GFP_RECLAIM_MASK|GFP_CONSTRAINT_MASK. This is done outside of the critical
> code paths.
> 
> The might_sleep issues may be fixed by adding another check to
> __might_sleep().

That is not enough because slab and slub explicitely re-enable
interrupts when __GFP_WAIT is set, which is the problem we need to solve
in the first place, so we need to do the masking there.

Cheers,
Ben.


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