]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
[PATCH] CPU hotplug compatible alloc_percpu()
authorMartin Peschke <mp3@de.ibm.com>
Tue, 26 Sep 2006 06:31:21 +0000 (23:31 -0700)
committerLinus Torvalds <torvalds@g5.osdl.org>
Tue, 26 Sep 2006 15:48:47 +0000 (08:48 -0700)
commit7ff6f08295d90ab20d25200ef485ebb45b1b8d71
tree4c3410dcf5191ab574304f3ffbafd675545c2297
parent8bc719d3cab8414938f9ea6e33b58d8810d18068
[PATCH] CPU hotplug compatible alloc_percpu()

This patch splits alloc_percpu() up into two phases.  Likewise for
free_percpu().  This allows clients to limit initial allocations to online
cpu's, and to populate or depopulate per-cpu data at run time as needed:

  struct my_struct *obj;

  /* initial allocation for online cpu's */
  obj = percpu_alloc(sizeof(struct my_struct), GFP_KERNEL);

  ...

  /* populate per-cpu data for cpu coming online */
  ptr = percpu_populate(obj, sizeof(struct my_struct), GFP_KERNEL, cpu);

  ...

  /* access per-cpu object */
  ptr = percpu_ptr(obj, smp_processor_id());

  ...

  /* depopulate per-cpu data for cpu going offline */
  percpu_depopulate(obj, cpu);

  ...

  /* final removal */
  percpu_free(obj);

Signed-off-by: Martin Peschke <mp3@de.ibm.com>
Cc: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
include/linux/percpu.h
mm/slab.c