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From: Mike Travis <travis@sgi.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Christoph Lameter <clameter@sgi.com>,
	David Miller <davem@davemloft.net>,
	Eric Dumazet <dada1@cosmosbay.com>,
	Jeremy Fitzhardinge <jeremy@goop.org>,
	linux-kernel@vger.kernel.org
Subject: [PATCH 0/4] percpu: Optimize percpu accesses
Date: Tue, 03 Jun 2008 17:30:18 -0700	[thread overview]
Message-ID: <20080604003018.538497000@polaris-admin.engr.sgi.com> (raw)


This patchset provides the following:

  * Generic: Percpu infrastructure to rebase the per cpu area to zero

    This provides for the capability of accessing the percpu variables
    using a local register instead of having to go through a table
    on node 0 to find the cpu-specific offsets.  It also would allow
    atomic operations on percpu variables to reduce required locking.
    Uses a new config var HAVE_ZERO_BASED_PER_CPU to indicate to the
    generic code that the arch has this new basing.

  * x86_64: Fold pda into per cpu area

    Declare the pda as a per cpu variable. This will move the pda
    area to an address accessible by the x86_64 per cpu macros.
    Subtraction of __per_cpu_start will make the offset based from
    the beginning of the per cpu area.  Since %gs is pointing to the
    pda, it will then also point to the per cpu variables and can be
    accessed thusly:

	%gs:[&per_cpu_xxxx - __per_cpu_start]

  * x86_64: Rebase per cpu variables to zero

    Take advantage of the zero-based per cpu area provided above.
    Then we can directly use the x86_32 percpu operations. x86_32
    offsets %fs by __per_cpu_start. x86_64 has %gs pointing directly
    to the pda and the per cpu area thereby allowing access to the
    pda with the x86_64 pda operations and access to the per cpu
    variables using x86_32 percpu operations.


Based on linux-2.6.tip

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Mike Travis <travis@sgi.com>
---

-- 

             reply	other threads:[~2008-06-04  0:30 UTC|newest]

Thread overview: 109+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-06-04  0:30 Mike Travis [this message]
2008-06-04  0:30 ` [PATCH 1/4] Zero based percpu: Infrastructure to rebase the per cpu area to zero Mike Travis
2008-06-10 10:06   ` Ingo Molnar
2008-06-04  0:30 ` [PATCH 2/4] x86: Extend percpu ops to 64 bit Mike Travis
2008-06-10 10:04   ` Ingo Molnar
2008-06-04  0:30 ` [PATCH 3/4] x86_64: Fold pda into per cpu area Mike Travis
2008-06-04 12:59   ` Jeremy Fitzhardinge
2008-06-04 13:48     ` Mike Travis
2008-06-04 13:58       ` Jeremy Fitzhardinge
2008-06-04 14:17         ` Mike Travis
2008-06-09 23:18     ` Christoph Lameter
2008-06-05 10:22   ` [crash, bisected] " Ingo Molnar
2008-06-05 16:02     ` Mike Travis
2008-06-06  8:29       ` Jeremy Fitzhardinge
2008-06-06 13:15         ` Mike Travis
2008-06-18  5:34           ` Jeremy Fitzhardinge
2008-06-10 21:31     ` Mike Travis
2008-06-18 17:36       ` Jeremy Fitzhardinge
2008-06-18 18:17         ` Mike Travis
2008-06-18 18:33           ` Ingo Molnar
2008-06-18 19:33           ` Jeremy Fitzhardinge
     [not found]             ` <48596893.4040908@sgi.com>
     [not found]               ` <485AADAC.3070301@sgi.com>
     [not found]                 ` <485AB78B.5090904@goop.org>
     [not found]                   ` <485AC120.6010202@sgi.com>
     [not found]                     ` <485AC5D4.6040302@goop.org>
     [not found]                       ` <485ACA8F.10006@sgi.com>
     [not found]                         ` <485ACD92.8050109@sgi.com>
2008-06-19 21:35                           ` Jeremy Fitzhardinge
2008-06-19 21:54                             ` Jeremy Fitzhardinge
2008-06-19 22:13                             ` Mike Travis
2008-06-19 22:21                               ` Jeremy Fitzhardinge
2008-06-30 17:49                                 ` Mike Travis
2008-06-19 22:23                               ` Jeremy Fitzhardinge
     [not found]                                 ` <485BDB04.4090709@sgi.com>
2008-06-20 17:25                                   ` Jeremy Fitzhardinge
2008-06-20 17:48                                     ` Christoph Lameter
2008-06-20 18:30                                       ` Mike Travis
2008-06-20 18:40                                         ` Jeremy Fitzhardinge
2008-06-20 18:37                                       ` Jeremy Fitzhardinge
2008-06-20 18:51                                         ` Christoph Lameter
2008-06-20 19:04                                           ` Jeremy Fitzhardinge
2008-06-20 19:21                                             ` H. Peter Anvin
2008-06-20 19:43                                             ` Eric W. Biederman
2008-06-20 20:04                                               ` Mike Travis
2008-06-20 20:37                                                 ` Christoph Lameter
2008-06-20 19:06                                         ` Mike Travis
2008-06-20 20:25                                           ` Eric W. Biederman
2008-06-20 20:55                                             ` Christoph Lameter
2008-06-23 16:55                                             ` Mike Travis
2008-06-23 17:33                                               ` Jeremy Fitzhardinge
2008-06-23 18:04                                                 ` Mike Travis
2008-06-23 18:36                                                   ` Mike Travis
2008-06-23 19:41                                                     ` Jeremy Fitzhardinge
2008-06-24  0:02                                                       ` Mike Travis
2008-06-30 17:07                                             ` Mike Travis
2008-06-30 17:18                                               ` H. Peter Anvin
2008-06-30 17:57                                                 ` Mike Travis
2008-06-30 20:50                                                   ` Eric W. Biederman
2008-06-30 21:08                                                     ` Jeremy Fitzhardinge
2008-07-01  8:40                                                       ` Eric W. Biederman
2008-07-01 16:27                                                         ` Jeremy Fitzhardinge
2008-07-01 16:55                                                           ` Mike Travis
2008-07-01 16:56                                                         ` H. Peter Anvin
2008-07-01 17:26                                                           ` Jeremy Fitzhardinge
2008-07-01 20:40                                                             ` Eric W. Biederman
2008-07-01 21:10                                                               ` Jeremy Fitzhardinge
2008-07-01 21:39                                                                 ` Eric W. Biederman
2008-07-01 21:52                                                                   ` Jeremy Fitzhardinge
2008-07-02  0:20                                                                     ` H. Peter Anvin
2008-07-02  1:15                                                                       ` Mike Travis
2008-07-02  1:32                                                                         ` Eric W. Biederman
2008-07-02  1:51                                                                           ` Mike Travis
2008-07-02  2:50                                                                             ` Eric W. Biederman
2008-07-02  1:40                                                                         ` H. Peter Anvin
2008-07-02  1:44                                                                         ` Mike Travis
2008-07-02  1:45                                                                           ` H. Peter Anvin
2008-07-02  1:55                                                                             ` Mike Travis
2008-07-02 22:50                                                                             ` Mike Travis
2008-07-03  4:34                                                                               ` Eric W. Biederman
2008-07-07 17:17                                                                                 ` Mike Travis
2008-07-07 19:46                                                                                   ` Eric W. Biederman
2008-07-08 18:21                                                                                     ` Mike Travis
2008-07-08 23:36                                                                                       ` Eric W. Biederman
2008-07-08 23:49                                                                                         ` Jeremy Fitzhardinge
2008-07-09 14:39                                                                                           ` Mike Travis
2008-07-25 20:06                                                                                           ` Mike Travis
2008-07-25 20:12                                                                                             ` Jeremy Fitzhardinge
2008-07-25 20:34                                                                                               ` Mike Travis
2008-07-25 20:43                                                                                                 ` Jeremy Fitzhardinge
2008-07-25 21:05                                                                                                   ` Mike Travis
2008-07-09 14:37                                                                                         ` Mike Travis
2008-07-09 22:38                                                                                           ` Eric W. Biederman
2008-07-09 23:30                                                                                             ` Mike Travis
2008-07-10  0:04                                                                                               ` Eric W. Biederman
2008-07-02  2:01                                                                   ` H. Peter Anvin
2008-07-02  3:08                                                                     ` Eric W. Biederman
2008-07-01 21:11                                                               ` Andi Kleen
2008-07-01 21:42                                                                 ` Eric W. Biederman
2008-07-01 18:41                                                           ` Eric W. Biederman
2008-07-01 12:09                                                       ` Mike Travis
2008-07-01 11:49                                                     ` Mike Travis
2008-06-30 17:43                                               ` Jeremy Fitzhardinge
2008-06-04  0:30 ` [PATCH 4/4] x86: Replace xxx_pda() operations with x86_xx_percpu() Mike Travis
2008-06-09 13:03   ` Ingo Molnar
2008-06-09 16:08     ` Mike Travis
2008-06-09 17:36     ` Mike Travis
2008-06-09 18:20       ` Christoph Lameter
2008-06-09 23:29         ` Jeremy Fitzhardinge
2008-06-10 10:09       ` Ingo Molnar
2008-06-10 15:07         ` Mike Travis
2008-06-04 10:18 ` [PATCH] x86: collapse the various size-dependent percpu accessors together Jeremy Fitzhardinge
2008-06-04 10:45   ` Jeremy Fitzhardinge
2008-06-04 11:29     ` Ingo Molnar
2008-06-04 12:09       ` Jeremy Fitzhardinge
2008-06-10 17:21         ` Christoph Lameter
  -- strict thread matches above, loose matches on Subject: below --
2008-02-01 19:14 [PATCH 0/4] percpu: Optimize percpu accesses travis

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