All of lore.kernel.org
 help / color / mirror / Atom feed
From: Pekka Enberg <penberg@cs.helsinki.fi>
To: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>,
	tj@kernel.org, Eric Dumazet <eric.dumazet@gmail.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	linux-kernel@vger.kernel.org,
	Thomas Gleixner <tglx@linutronix.de>,
	mingo@elte.hu
Subject: Re: [slubllv7 04/17] x86: Add support for cmpxchg_double
Date: Thu, 09 Jun 2011 12:53:43 +0300	[thread overview]
Message-ID: <4DF09827.7070809@cs.helsinki.fi> (raw)
In-Reply-To: <20110601172614.173427964@linux.com>

On 6/1/11 8:25 PM, Christoph Lameter wrote:
> A simple implementation that only supports the word size and does not
> have a fallback mode (would require a spinlock).
>
> Add 32 and 64 bit support for cmpxchg_double. cmpxchg double uses
> the cmpxchg8b or cmpxchg16b instruction on x86 processors to compare
> and swap 2 machine words. This allows lockless algorithms to move more
> context information through critical sections.
>
> Set a flag CONFIG_CMPXCHG_DOUBLE to signal that support for double word
> cmpxchg detection has been build into the kernel. Note that each subsystem
> using cmpxchg_double has to implement a fall back mechanism as long as
> we offer support for processors that do not implement cmpxchg_double.
>
> Reviewed-by: H. Peter Anvin<hpa@zytor.com>
> Cc: tj@kernel.org
> Signed-off-by: Christoph Lameter<cl@linux.com>

Tejun, I'm going to queue this series for linux-next in the next few 
days. Could you either pick up this patch so I can pull from your tree 
or alternatively, is it OK to queue this through slab.git?

			Pekka

  reply	other threads:[~2011-06-09  9:53 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-01 17:25 [slubllv7 00/17] SLUB: Lockless freelists for objects V7 Christoph Lameter
2011-06-01 17:25 ` [slubllv7 01/17] slub: Push irq disable into allocate_slab() Christoph Lameter
2011-06-01 17:25 ` [slubllv7 02/17] slub: Do not use frozen page flag but a bit in the page counters Christoph Lameter
2011-06-01 17:25 ` [slubllv7 03/17] slub: Move page->frozen handling near where the page->freelist handling occurs Christoph Lameter
2011-06-01 17:25 ` [slubllv7 04/17] x86: Add support for cmpxchg_double Christoph Lameter
2011-06-09  9:53   ` Pekka Enberg [this message]
2011-06-10 15:17     ` Christoph Lameter
2011-06-11  9:50       ` Pekka Enberg
2011-06-11 17:02         ` Christoph Lameter
2011-06-14  5:49           ` Pekka Enberg
2011-06-14  8:04             ` Ingo Molnar
2011-06-14 14:04               ` Christoph Lameter
2011-06-14 15:05                 ` H. Peter Anvin
2011-06-15  8:55   ` Tejun Heo
2011-06-15 14:26     ` Christoph Lameter
2011-06-15 16:39       ` Tejun Heo
2011-06-15 17:19         ` Christoph Lameter
2011-06-25 23:49   ` [tip:x86/atomic] " tip-bot for Christoph Lameter
2011-06-01 17:25 ` [slubllv7 05/17] mm: Rearrange struct page Christoph Lameter
2011-06-09  9:57   ` Pekka Enberg
2011-06-09 16:45     ` Andrew Morton
2011-06-09 17:03       ` [PATCH] checkpatch: Add a "prefer __aligned" check Joe Perches
2011-06-01 17:25 ` [slubllv7 06/17] slub: Add cmpxchg_double_slab() Christoph Lameter
2011-07-11 19:55   ` Eric Dumazet
2011-07-12 15:59     ` Christoph Lameter
2011-07-12 16:06       ` Eric Dumazet
2011-07-12 16:47         ` Christoph Lameter
2011-07-12 18:40           ` H. Peter Anvin
2011-07-12 18:53             ` Christoph Lameter
2011-07-12 20:40               ` H. Peter Anvin
2011-06-01 17:25 ` [slubllv7 07/17] slub: explicit list_lock taking Christoph Lameter
2011-06-01 17:25 ` [slubllv7 08/17] slub: Pass kmem_cache struct to lock and freeze slab Christoph Lameter
2011-06-01 17:25 ` [slubllv7 09/17] slub: Rework allocator fastpaths Christoph Lameter
2011-06-01 17:25 ` [slubllv7 10/17] slub: Invert locking and avoid slab lock Christoph Lameter
2011-06-01 17:25 ` [slubllv7 11/17] slub: Disable interrupts in free_debug processing Christoph Lameter
2011-06-01 17:25 ` [slubllv7 12/17] slub: Avoid disabling interrupts in free slowpath Christoph Lameter
2011-06-01 17:25 ` [slubllv7 13/17] slub: Get rid of the another_slab label Christoph Lameter
2011-06-01 17:25 ` [slubllv7 14/17] slub: Add statistics for the case that the current slab does not match the node Christoph Lameter
2011-06-01 17:25 ` [slubllv7 15/17] slub: fast release on full slab Christoph Lameter
2011-06-01 17:25 ` [slubllv7 16/17] slub: Not necessary to check for empty slab on load_freelist Christoph Lameter
2011-06-01 17:26 ` [slubllv7 17/17] slub: slabinfo update for cmpxchg handling Christoph Lameter

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4DF09827.7070809@cs.helsinki.fi \
    --to=penberg@cs.helsinki.fi \
    --cc=cl@linux.com \
    --cc=eric.dumazet@gmail.com \
    --cc=hpa@zytor.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@elte.hu \
    --cc=rientjes@google.com \
    --cc=tglx@linutronix.de \
    --cc=tj@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.