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authorJens Axboe <jens.axboe@oracle.com>2008-05-07 12:15:46 +0400
committerJens Axboe <jens.axboe@oracle.com>2008-05-07 12:15:46 +0400
commit28f13702f03e527fcb979747a882cf366c489c50 (patch)
tree08cf04c696bf0facb083bbfbdd867e5949c5fa14 /drivers/block
parent6d63c275572d1e6f00d4fa154f16fbb0d8c2d2bf (diff)
downloadlinux-28f13702f03e527fcb979747a882cf366c489c50.tar.xz
block: avoid duplicate calls to get_part() in disk stat code
get_part() is fairly expensive, as it O(N) loops over partitions to find the right one. In lots of normal IO paths we end up looking up the partition twice, to make matters even worse. Change the stat add code to accept a passed in partition instead. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/aoe/aoecmd.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 8fc429cf82b6..41f818be2f7e 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -755,11 +755,13 @@ diskstats(struct gendisk *disk, struct bio *bio, ulong duration, sector_t sector
{
unsigned long n_sect = bio->bi_size >> 9;
const int rw = bio_data_dir(bio);
+ struct hd_struct *part;
- all_stat_inc(disk, ios[rw], sector);
- all_stat_add(disk, ticks[rw], duration, sector);
- all_stat_add(disk, sectors[rw], n_sect, sector);
- all_stat_add(disk, io_ticks, duration, sector);
+ part = get_part(disk, sector);
+ all_stat_inc(disk, part, ios[rw], sector);
+ all_stat_add(disk, part, ticks[rw], duration, sector);
+ all_stat_add(disk, part, sectors[rw], n_sect, sector);
+ all_stat_add(disk, part, io_ticks, duration, sector);
}
void