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zram: use generic start/end io accounting 

Use bio generic_start_io_acct() and generic_end_io_acct() to account
device's block layer statistics.  This will let users to monitor zram
activities using sysstat and similar packages/tools.

Apart from the usual per-stat sysfs attr, zram IO stats are now also
available in '/sys/block/zram<id>/stat' and '/proc/diskstats' files.

We will slowly get rid of per-stat sysfs files.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky 2015-04-15 16:15:57 -07:00 committed by Linus Torvalds
parent c72c6160d9
commit 8811a9421b
1 changed files with 6 additions and 0 deletions
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6
drivers/block/zram/zram_drv.c
View File

@ -670,8 +670,12 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index,
int offset, int rw)
{
unsigned long start_time = jiffies;
int ret;
generic_start_io_acct(rw, bvec->bv_len >> SECTOR_SHIFT,
&zram->disk->part0);
if (rw == READ) {
atomic64_inc(&zram->stats.num_reads);
ret = zram_bvec_read(zram, bvec, index, offset);
@ -680,6 +684,8 @@ static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index,
ret = zram_bvec_write(zram, bvec, index, offset);
}
generic_end_io_acct(rw, &zram->disk->part0, start_time);
if (unlikely(ret)) {
if (rw == READ)
atomic64_inc(&zram->stats.failed_reads);