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authorTejun Heo <tj@kernel.org>2008-08-25 14:47:21 +0400
committerJens Axboe <jens.axboe@oracle.com>2008-10-09 10:56:06 +0400
commitc9959059161ddd7bf4670cf47367033d6b2f79c4 (patch)
tree6454db55f8e34361fe472358e10e0c5cfac1e366 /drivers/md/multipath.c
parente71bf0d0ee89e51b92776391c5634938236977d5 (diff)
downloadlinux-c9959059161ddd7bf4670cf47367033d6b2f79c4.tar.xz
block: fix diskstats access
There are two variants of stat functions - ones prefixed with double underbars which don't care about preemption and ones without which disable preemption before manipulating per-cpu counters. It's unclear whether the underbarred ones assume that preemtion is disabled on entry as some callers don't do that. This patch unifies diskstats access by implementing disk_stat_lock() and disk_stat_unlock() which take care of both RCU (for partition access) and preemption (for per-cpu counter access). diskstats access should always be enclosed between the two functions. As such, there's no need for the versions which disables preemption. They're removed and double underbars ones are renamed to drop the underbars. As an extra argument is added, there's no danger of using the old version unconverted. disk_stat_lock() uses get_cpu() and returns the cpu index and all diskstat functions which access per-cpu counters now has @cpu argument to help RT. This change adds RCU or preemption operations at some places but also collapses several preemption ops into one at others. Overall, the performance difference should be negligible as all involved ops are very lightweight per-cpu ones. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/md/multipath.c')
-rw-r--r--drivers/md/multipath.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index c4779ccba1c3..182f5a94cdc5 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -147,6 +147,7 @@ static int multipath_make_request (struct request_queue *q, struct bio * bio)
struct multipath_bh * mp_bh;
struct multipath_info *multipath;
const int rw = bio_data_dir(bio);
+ int cpu;
if (unlikely(bio_barrier(bio))) {
bio_endio(bio, -EOPNOTSUPP);
@@ -158,8 +159,10 @@ static int multipath_make_request (struct request_queue *q, struct bio * bio)
mp_bh->master_bio = bio;
mp_bh->mddev = mddev;
- disk_stat_inc(mddev->gendisk, ios[rw]);
- disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio));
+ cpu = disk_stat_lock();
+ disk_stat_inc(cpu, mddev->gendisk, ios[rw]);
+ disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio));
+ disk_stat_unlock();
mp_bh->path = multipath_map(conf);
if (mp_bh->path < 0) {