linux-kernel - Re: [PATCH v2] slab,slub: ignore __GFP_WAIT if we're booting or suspending

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Message-Id: <1244800774.7172.116.camel@pasglop>
Date:	Fri, 12 Jun 2009 19:59:34 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Pekka Enberg <penberg@...helsinki.fi>, Ingo Molnar <mingo@...e.hu>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, cl@...ux-foundation.org,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH v2] slab,slub: ignore __GFP_WAIT if we're booting or
 suspending


> Maybe if we just not make it a general "tweak gfpflag" bit (at
> least not until a bit more discussion), but a specific workaround
> for the local_irq_enable in early boot problem.
> 
> Seems like it would not be hard to track things down if we add
> a warning if we have GFP_WAIT and interrupts are not enabled...

But tweaking local_irq_enable() will have a lot more performance & bloat
impact overall on the normal case.

Cheers,
Ben.


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