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authorMikulas Patocka <mpatocka@redhat.com>2012-10-22 19:39:16 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-28 10:59:36 -0700
commit1bf11c53535ab87e3bf14ecdf6747bf46f601c5d (patch)
tree9170fa956be0f564b988a88685eb82584347c2cf /fs/block_dev.c
parent5c1eabe68501d1e1b1586c7f4c46cc531828c4ab (diff)
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/block_dev.c')
0 files changed, 0 insertions, 0 deletions