linux-kernel - Re: [patch V2] mm/slub: Move slab initialization into irq enabled region

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Date:	Wed, 15 Jul 2015 16:43:04 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	Christoph Lameter <cl@...ux.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [patch V2] mm/slub: Move slab initialization into irq enabled
 region

On Fri, 10 Jul 2015, Thomas Gleixner wrote:

> Initializing a new slab can introduce rather large latencies because
> most of the initialization runs always with interrupts disabled.
> 
> There is no point in doing so. The newly allocated slab is not visible
> yet, so there is no reason to protect it against concurrent alloc/free.
> 
> Move the expensive parts of the initialization into allocate_slab(),
> so for all allocations with GFP_WAIT set, interrupts are enabled.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Christoph Lameter <cl@...ux.com>
> Cc: Pekka Enberg <penberg@...nel.org>
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: linux-mm@...ck.org
> Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Peter Zijlstra <peterz@...radead.org>

Acked-by: David Rientjes <rientjes@...gle.com>
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