summaryrefslogtreecommitdiffstats
path: root/Documentation/percpu-rw-semaphore.txt
diff options
context:
space:
mode:
authorMikulas Patocka <mpatocka@redhat.com>2012-09-26 19:56:15 +0200
committerJens Axboe <axboe@kernel.dk>2012-09-26 19:56:15 +0200
commite6b5c0822bcf43b91a2cdcb535ea828e953b6590 (patch)
treeb6268cea3d80c7b43ac2d7fb8beb7c5e2063b57a /Documentation/percpu-rw-semaphore.txt
parent3eab7315c8dd6685f58acba00319dd8b80a21d7a (diff)
percpu-rw-semaphore: fix documentation typos
One more patch for this thing, fixing some typos in the documentation. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation/percpu-rw-semaphore.txt')
-rw-r--r--Documentation/percpu-rw-semaphore.txt4
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/percpu-rw-semaphore.txt b/Documentation/percpu-rw-semaphore.txt
index eddd7709472..7d3c8243190 100644
--- a/Documentation/percpu-rw-semaphore.txt
+++ b/Documentation/percpu-rw-semaphore.txt
@@ -9,10 +9,10 @@ cores take the lock for reading, the cache line containing the semaphore
is bouncing between L1 caches of the cores, causing performance
degradation.
-Locking for reading it very fast, it uses RCU and it avoids any atomic
+Locking for reading is very fast, it uses RCU and it avoids any atomic
instruction in the lock and unlock path. On the other hand, locking for
writing is very expensive, it calls synchronize_rcu() that can take
-hundreds of microseconds.
+hundreds of milliseconds.
The lock is declared with "struct percpu_rw_semaphore" type.
The lock is initialized percpu_init_rwsem, it returns 0 on success and