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| author | Paul Jackson <pj@sgi.com> | 2006-01-08 10:02:04 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-09 05:13:45 +0100 |
| commit | 03a285f58064b8e0af08383e082e383753d9c33e (patch) | |
| tree | af458f3357d4e2d01dc04d2d41a7dd7d502c4755 /drivers/rapidio | |
| parent | [PATCH] cpuset: mark number_of_cpusets read_mostly (diff) | |
| download | linux-03a285f58064b8e0af08383e082e383753d9c33e.tar.xz linux-03a285f58064b8e0af08383e082e383753d9c33e.zip | |
[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>
Diffstat (limited to 'drivers/rapidio')
0 files changed, 0 insertions, 0 deletions