David Wang bda9c7d92f block/genhd: use seq_put_decimal_ull for diskstats decimal values ... seq_printf is costly. For each block device, 19 decimal values are yielded in /proc/diskstats via seq_printf. On a system with 16 logical block devices, profiling for open/read/close sequences shows seq_printf took ~75% samples of diskstats_show: diskstats_show(92.626% 2269372/2450040) seq_printf(76.026% 1725313/2269372) vsnprintf(99.163% 1710866/1725313) format_decode(26.597% 455040/1710866) number(19.554% 334542/1710866) memcpy_orig(4.183% 71570/1710866) ... srso_return_thunk(0.009% 148/1725313) part_stat_read_all(8.030% 182236/2269372) One million rounds of open/read/close /proc/diskstats takes: real 0m37.687s user 0m0.264s sys 0m32.911s On average, each sequence tooks ~0.032ms With this patch, most decimal values are yield via seq_put_decimal_ull, performance is significantly improved: real 0m20.792s user 0m0.316s sys 0m20.463s On average, each sequence tooks ~0.020ms, a ~37.5% improvement. Signed-off-by: David Wang <00107082@163.com> Link: https://lore.kernel.org/r/20241108054500.4251-1-00107082@163.com Signed-off-by: Jens Axboe <axboe@kernel.dk>		2024-11-13 14:02:19 -07:00
..
partitions	block: add partition uuid into uevent as "PARTUUID"	2024-10-22 08:15:17 -06:00
badblocks.c
bdev.c	for-6.12/block-20240925	2024-09-25 14:56:40 -07:00
bfq-cgroup.c	block, bfq: merge bfq_release_process_ref() into bfq_put_cooperator()	2024-09-10 16:32:09 -06:00
bfq-iosched.c	block, bfq: factor out a helper to split bfqq in bfq_init_rq()	2024-09-10 16:32:09 -06:00
bfq-iosched.h	block, bfq: remove bfq_log_bfqg()	2024-09-10 16:32:09 -06:00
bfq-wf2q.c
bio-integrity.c	blk-integrity: remove seed for user mapped buffers	2024-10-30 07:49:32 -06:00
bio.c	block: Error an attempt to split an atomic write in bio_split()	2024-11-11 08:35:46 -07:00
blk-cgroup-fc-appid.c
blk-cgroup-rwstat.c
blk-cgroup-rwstat.h
blk-cgroup.c	blk-ioprio: remove per-disk structure	2024-07-28 16:47:51 -06:00
blk-cgroup.h	blk-cgroup: Remove unused declaration blkg_path()	2024-08-16 15:07:27 -06:00
blk-core.c	block: add a rq_list type	2024-11-13 12:04:58 -07:00
blk-crypto-fallback.c	block: Rework bio_split() return value	2024-11-11 08:35:46 -07:00
blk-crypto-internal.h
blk-crypto-profile.c
blk-crypto-sysfs.c
blk-crypto.c
blk-flush.c	for-6.11/block-20240710	2024-07-15 14:20:22 -07:00
blk-ia-ranges.c
blk-integrity.c	blk-integrity: remove seed for user mapped buffers	2024-10-30 07:49:32 -06:00
blk-ioc.c	block: replace call_rcu by kfree_rcu for simple kmem_cache_free callback	2024-10-22 08:16:40 -06:00
blk-iocost.c	blk_iocost: remove some duplicate irq disable/enables	2024-10-02 07:15:43 -06:00
blk-iolatency.c
blk-ioprio.c	blk-ioprio: remove per-disk structure	2024-07-28 16:47:51 -06:00
blk-ioprio.h	blk-ioprio: remove per-disk structure	2024-07-28 16:47:51 -06:00
blk-lib.c	block: fix detection of unsupported WRITE SAME in blkdev_issue_write_zeroes	2024-08-28 08:49:25 -06:00
blk-map.c	block: don't free the integrity payload in bio_integrity_unmap_free_user	2024-07-03 10:21:16 -06:00
blk-merge.c	block: add a rq_list type	2024-11-13 12:04:58 -07:00
blk-mq-cpumap.c
blk-mq-debugfs.c	block: Catch possible entries missing from rqf_name[]	2024-07-19 09:32:49 -06:00
blk-mq-debugfs.h	block: Replace zone_wlock debugfs entry with zone_wplugs entry	2024-04-17 08:44:03 -06:00
blk-mq-pci.c
blk-mq-sched.c
blk-mq-sched.h
blk-mq-sysfs.c
blk-mq-tag.c	block: Fix lockdep warning in blk_mq_mark_tag_wait	2024-08-15 19:25:03 -06:00
blk-mq-virtio.c
blk-mq.c	block: don't reorder requests in blk_add_rq_to_plug	2024-11-13 12:04:58 -07:00
blk-mq.h	block: add a rq_list type	2024-11-13 12:04:58 -07:00
blk-pm.c
blk-pm.h
blk-rq-qos.c	block: remove redundant explicit memory barrier from rq_qos waiter and waker	2024-10-22 14:05:09 -06:00
blk-rq-qos.h
blk-settings.c	block: export blk_validate_limits	2024-11-13 11:40:11 -07:00
blk-stat.c	blk-throttle: remove CONFIG_BLK_DEV_THROTTLING_LOW	2024-05-09 09:44:55 -06:00
blk-stat.h	block: delete redundant function declaration	2024-05-27 13:58:06 -06:00
blk-sysfs.c	block: pre-calculate max_zone_append_sectors	2024-11-11 09:20:36 -07:00
blk-throttle.c	block: flush all throttled bios when deleting the cgroup	2024-10-22 08:16:43 -06:00
blk-throttle.h	blk-throttle: remove last_low_overflow_time	2024-09-10 16:31:41 -06:00
blk-timeout.c
blk-wbt.c	blk-wbt: don't throttle swap writes in direct reclaim	2024-07-01 06:51:53 -06:00
blk-wbt.h
blk-zoned.c	block: Add a public bdev_zone_is_seq() helper	2024-11-07 15:30:54 -07:00
blk.h	block: lift bio_is_zone_append to bio.h	2024-11-11 09:06:45 -07:00
bounce.c	block: split integrity support out of bio.h	2024-07-03 10:21:15 -06:00
bsg-lib.c	scsi: bsg: Pass dev to blk_mq_alloc_queue()	2024-05-30 20:22:15 -04:00
bsg.c
disk-events.c
early-lookup.c	wrapper for access to ->bd_partno	2024-05-02 17:48:09 -04:00
elevator.c	block: don't verify IO lock for freeze/unfreeze in elevator_init_mq()	2024-11-07 16:27:22 -07:00
elevator.h	block: return void from the queue_sysfs_entry load_module method	2024-10-22 08:16:22 -06:00
fops.c	fs/block: Check for IOCB_DIRECT in generic_atomic_write_valid()	2024-10-19 16:48:22 -06:00
genhd.c	block/genhd: use seq_put_decimal_ull for diskstats decimal values	2024-11-13 14:02:19 -07:00
holder.c
ioctl.c	block: implement async io_uring discard cmd	2024-09-11 10:45:28 -06:00
ioprio.c
Kconfig	block: remove the blk_integrity_profile structure	2024-06-14 10:20:06 -06:00
Kconfig.iosched
kyber-iosched.c
Makefile	block: remove the blk_integrity_profile structure	2024-06-14 10:20:06 -06:00
mq-deadline.c	block/mq-deadline: Fix the tag reservation code	2024-07-02 08:47:45 -06:00
opal_proto.h
sed-opal.c	block: sed-opal: add ioctl IOC_OPAL_SET_SID_PW	2024-10-22 08:16:40 -06:00
t10-pi.c	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00