]> err.no Git - linux-2.6/commit
[PATCH] cpuset: skip rcu check if task is in root cpuset
authorPaul Jackson <pj@sgi.com>
Sun, 8 Jan 2006 09:02:04 +0000 (01:02 -0800)
committerLinus Torvalds <torvalds@g5.osdl.org>
Mon, 9 Jan 2006 04:13:45 +0000 (20:13 -0800)
commit03a285f58064b8e0af08383e082e383753d9c33e
treeaf458f3357d4e2d01dc04d2d41a7dd7d502c4755
parent7edc59628b2f5d6516b4677b3b56f5f056e45cd9
[PATCH] cpuset: skip rcu check if task is in root cpuset

For systems that aren't using cpusets, but have them CONFIG_CPUSET enabled in
their kernel (eventually this may be most distribution kernels), this patch
removes even the minimal rcu_read_lock() from the memory page allocation path.

Actually, it removes that rcu call for any task that is in the root cpuset
(top_cpuset), which on systems not actively using cpusets, is all tasks.

We don't need the rcu check for tasks in the top_cpuset, because the
top_cpuset is statically allocated, so at no risk of being freed out from
underneath us.

Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
kernel/cpuset.c