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authorOleg Nesterov <oleg@redhat.com>2012-12-18 04:01:32 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-18 05:15:18 +0400
commita1fd3e24d8a484b3265a6d485202afe093c058f3 (patch)
tree472f6480a81abbc04b27eccdb798d80b1685bee0 /lib/kstrtox.c
parent53809751ac230a3611b5cdd375f3389f3207d471 (diff)
downloadlinux-a1fd3e24d8a484b3265a6d485202afe093c058f3.tar.xz
percpu_rw_semaphore: reimplement to not block the readers unnecessarily
Currently the writer does msleep() plus synchronize_sched() 3 times to acquire/release the semaphore, and during this time the readers are blocked completely. Even if the "write" section was not actually started or if it was already finished. With this patch down_write/up_write does synchronize_sched() twice and down_read/up_read are still possible during this time, just they use the slow path. percpu_down_write() first forces the readers to use rw_semaphore and increment the "slow" counter to take the lock for reading, then it takes that rw_semaphore for writing and blocks the readers. Also. With this patch the code relies on the documented behaviour of synchronize_sched(), it doesn't try to pair synchronize_sched() with barrier. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mikulas Patocka <mpatocka@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anton Arapov <anton@redhat.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/kstrtox.c')
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