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| author | Mikulas Patocka | 2012-10-23 01:39:16 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2012-10-28 18:59:36 +0100 |
| commit | 1bf11c53535ab87e3bf14ecdf6747bf46f601c5d (patch) | |
| tree | 9170fa956be0f564b988a88685eb82584347c2cf /fs | |
| parent | percpu-rw-semaphores: use light/heavy barriers (diff) | |
| download | kernel-qcow2-linux-1bf11c53535ab87e3bf14ecdf6747bf46f601c5d.tar.gz kernel-qcow2-linux-1bf11c53535ab87e3bf14ecdf6747bf46f601c5d.tar.xz kernel-qcow2-linux-1bf11c53535ab87e3bf14ecdf6747bf46f601c5d.zip | |
percpu-rw-semaphores: use rcu_read_lock_sched
Use rcu_read_lock_sched / rcu_read_unlock_sched / synchronize_sched
instead of rcu_read_lock / rcu_read_unlock / synchronize_rcu.
This is an optimization. The RCU-protected region is very small, so
there will be no latency problems if we disable preempt in this region.
So we use rcu_read_lock_sched / rcu_read_unlock_sched that translates
to preempt_disable / preempt_disable. It is smaller (and supposedly
faster) than preemptible rcu_read_lock / rcu_read_unlock.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
0 files changed, 0 insertions, 0 deletions