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block: disable I/O stats accounting by default

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While Android userspace (e.g. storaged) does use iostats via
/proc/diskstats, init will explicitly enable iostats for the devices on
which it is primarily used - sda and sdf. Avoid the 0.5-1% overhead for
block devices that do not need it.

Signed-off-by: Danny Lin <danny@kdrag0n.dev>
[@0ctobot: Adapted for msm-4.19]
Signed-off-by: Adam W. Willis <return.of.octobot@gmail.com>
Signed-off-by: dreamisbaka <jolinux.g@gmail.com>
This commit is contained in:
kdrag0n 2018-12-22 22:36:19 -08:00 committed by Gagan Malvi
parent 3670a932bd
commit 38238767fb
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GPG key ID: B932A7CE71E9198F
1 changed files with 2 additions and 4 deletions
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6
include/linux/blkdev.h
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@ -708,12 +708,10 @@ struct request_queue {
#define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */
#define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */
#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
(1 << QUEUE_FLAG_SAME_COMP) | \
#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_SAME_COMP) | \
(1 << QUEUE_FLAG_ADD_RANDOM))
#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
(1 << QUEUE_FLAG_SAME_COMP) | \
#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_SAME_COMP) | \
(1 << QUEUE_FLAG_POLL))
void blk_queue_flag_set(unsigned int flag, struct request_queue *q);