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>
This commit is contained in:
parent
3eab7315c8
commit
e6b5c0822b
|
@ -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
|
is bouncing between L1 caches of the cores, causing performance
|
||||||
degradation.
|
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
|
instruction in the lock and unlock path. On the other hand, locking for
|
||||||
writing is very expensive, it calls synchronize_rcu() that can take
|
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 declared with "struct percpu_rw_semaphore" type.
|
||||||
The lock is initialized percpu_init_rwsem, it returns 0 on success and
|
The lock is initialized percpu_init_rwsem, it returns 0 on success and
|
||||||
|
|
Reference in New Issue