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From: Pekka Enberg <penberg@kernel.org>
To: Christoph Lameter <cl@linux.com>
Cc: linux-kernel@vger.kernel.org, rientjes@google.com,
	andi@firstfloor.org, mgorman@suse.de, akpm@linux-foundation.org,
	torvalds@linux-foundation.org
Subject: Re: [slub p4 0/7] slub: per cpu partial lists V4
Date: Sat, 20 Aug 2011 13:48:43 +0300 (EEST)	[thread overview]
Message-ID: <alpine.DEB.2.00.1108201345130.3008@localhost6.localdomain6> (raw)
In-Reply-To: <20110809211221.831975979@linux.com>

On Tue, 9 Aug 2011, Christoph Lameter wrote:
> V3->V4 : Use a single linked per cpu list instead of a per cpu array.
> 	This results in improvements even for the single threaded
> 	case. I think this is ready for more widespread testing (-next?)
> 	The number of partial pages per cpu is configurable via
> 	/sys/kernel/slab/<name>/cpu_partial
>
> V2->V3 : Work on the todo list. Still some work to be done to reduce
>         code impact and make this all cleaner. (Pekka: patch 1-3
>         are cleanup patches of general usefulness. You got #1 already
>         2+3 could be picked up w/o any issue).
>
> The following patchset introduces per cpu partial lists which allow
> a performance increase of around ~10-20% with hackbench on my Sandybridge
> processor.
>
> These lists help to avoid per node locking overhead. Allocator latency
> could be further reduced by making these operations work without
> disabling interrupts (like the fastpath and the free slowpath) but that
> is another project.
>
> It is interesting to note that BSD has gone to a scheme with partial
> pages only per cpu (source: Adrian). Transfer of cpu ownerships is
> done using IPIs. Probably too much overhead for our taste. The approach
> here keeps the per node partial lists essentially meaning the "pages"
> in there have no cpu owner.

These patches are now in slub/partial branch of slab.git. I'll probably 
queue them for linux-next early next week if they don't explode on my 
machine.

 			Pekka

      parent reply	other threads:[~2011-08-20 10:48 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-09 21:12 [slub p4 0/7] slub: per cpu partial lists V4 Christoph Lameter
2011-08-09 21:12 ` [slub p4 1/7] slub: free slabs without holding locks (V2) Christoph Lameter
2011-08-20 10:32   ` Pekka Enberg
2011-08-20 15:58     ` Christoph Lameter
2011-08-09 21:12 ` [slub p4 2/7] slub: Remove useless statements in __slab_alloc Christoph Lameter
2011-08-20 10:44   ` Pekka Enberg
2011-08-20 16:01     ` Christoph Lameter
2011-08-09 21:12 ` [slub p4 3/7] slub: Prepare inuse field in new_slab() Christoph Lameter
2011-08-09 21:12 ` [slub p4 4/7] slub: pass kmem_cache_cpu pointer to get_partial() Christoph Lameter
2011-08-09 21:12 ` [slub p4 5/7] slub: return object pointer from get_partial() / new_slab() Christoph Lameter
2011-08-09 21:12 ` [slub p4 6/7] slub: per cpu cache for partial pages Christoph Lameter
2011-08-20 10:40   ` Pekka Enberg
2011-08-20 16:00     ` Christoph Lameter
     [not found]   ` <CAF1ivSaH9fh6_QvuBkLc5t=zC4mPEAD5ZzsxOuPruDwG9MiZzw@mail.gmail.com>
2011-08-24  7:26     ` Lin Ming
2011-08-24 13:57       ` Christoph Lameter
2011-08-09 21:12 ` [slub p4 7/7] slub: update slabinfo tools to report per cpu partial list statistics Christoph Lameter
2011-08-13 18:28 ` [slub p4 0/7] slub: per cpu partial lists V4 David Rientjes
2011-08-15  8:44   ` Pekka Enberg
2011-08-15 14:29   ` Christoph Lameter
2011-08-20 10:48 ` Pekka Enberg [this message]

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