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| author | Jens Axboe <axboe@suse.de> | 2006-07-22 15:37:43 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@nelson.home.kernel.dk> | 2006-09-30 20:29:36 +0200 |
| commit | 4a893e837bb470867d74c05d6c6b97bba5a96185 (patch) | |
| tree | a8795f4422eac82679309e1f1f500789c3fd9bff /block/as-iosched.c | |
| parent | fc46379daf90dce57bf765c81d3b39f55150aac2 (diff) | |
[PATCH] elevator: define ioc counting mechanism
None of the in-kernel primitives for handling "atomic" counting seem
to be a good fit. We need something that is essentially free for
incrementing/decrementing, while the read side may be more expensive
as we only ever need to do that when a device is removed from the
kernel.
Use a per-cpu variable for maintaining a per-cpu ioc count and define
a reading mechanism that just sums up the values.
Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'block/as-iosched.c')
0 files changed, 0 insertions, 0 deletions