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blk-throttle: remove CONFIG_BLK_DEV_THROTTLING_LOW

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One the one hand, it's marked EXPERIMENTAL since 2017, and looks like
there are no users since then, and no testers and no developers, it's
just not active at all.

On the other hand, even if the config is disabled, there are still many
fields in throtl_grp and throtl_data and many functions that are only
used for throtl low.

At last, currently blk-throtl is initialized during disk initialization,
and destroyed during disk removal, and it exposes many functions to be
called directly from block layer.

Remove throtl low to make code much more cleaner and follow up work much
easier.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20240509121107.3195568-2-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai 2024-05-09 20:11:06 +08:00 committed by Jens Axboe
parent 7be835694d
commit bf20ab538c
9 changed files with 42 additions and 918 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
Documentation/ABI/stable/sysfs-block
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@ -594,18 +594,6 @@ Description:
the data. If no such restriction exists, this file will contain
'0'. This file is writable for testing purposes.
What: /sys/block/<disk>/queue/throttle_sample_time
Date: March 2017
Contact: linux-block@vger.kernel.org
Description:
[RW] This is the time window that blk-throttle samples data, in
millisecond. blk-throttle makes decision based on the
samplings. Lower time means cgroups have more smooth throughput,
but higher CPU overhead. This exists only when
CONFIG_BLK_DEV_THROTTLING_LOW is enabled.
What: /sys/block/<disk>/queue/virt_boundary_mask
Date: April 2021
Contact: linux-block@vger.kernel.org

1
arch/loongarch/configs/loongson3_defconfig
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@ -76,7 +76,6 @@ CONFIG_MODULE_FORCE_UNLOAD=y
CONFIG_MODVERSIONS=y
CONFIG_BLK_DEV_ZONED=y
CONFIG_BLK_DEV_THROTTLING=y
CONFIG_BLK_DEV_THROTTLING_LOW=y
CONFIG_BLK_WBT=y
CONFIG_BLK_CGROUP_IOLATENCY=y
CONFIG_BLK_CGROUP_FC_APPID=y

11
block/Kconfig
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@ -119,17 +119,6 @@ config BLK_DEV_THROTTLING
See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
config BLK_DEV_THROTTLING_LOW
bool "Block throttling .low limit interface support (EXPERIMENTAL)"
depends on BLK_DEV_THROTTLING
help
Add .low limit interface for block throttling. The low limit is a best
effort limit to prioritize cgroups. Depending on the setting, the limit
can be used to protect cgroups in terms of bandwidth/iops and better
utilize disk resource.
Note, this is an experimental interface and could be changed someday.
config BLK_WBT
bool "Enable support for block device writeback throttling"
help

1
block/bio.c
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@ -1629,7 +1629,6 @@ void bio_endio(struct bio *bio)
goto again;
}
blk_throtl_bio_endio(bio);
/* release cgroup info */
bio_uninit(bio);
if (bio->bi_end_io)

3
block/blk-stat.c
View File

@ -57,9 +57,6 @@ void blk_stat_add(struct request *rq, u64 now)
value = (now >= rq->io_start_time_ns) ? now - rq->io_start_time_ns : 0;
if (req_op(rq) == REQ_OP_READ || req_op(rq) == REQ_OP_WRITE)
blk_throtl_stat_add(rq, value);
rcu_read_lock();
cpu = get_cpu();
list_for_each_entry_rcu(cb, &q->stats->callbacks, list) {

7
block/blk-sysfs.c
View File

@ -516,10 +516,6 @@ QUEUE_RW_ENTRY(queue_io_timeout, "io_timeout");
QUEUE_RO_ENTRY(queue_virt_boundary_mask, "virt_boundary_mask");
QUEUE_RO_ENTRY(queue_dma_alignment, "dma_alignment");
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
QUEUE_RW_ENTRY(blk_throtl_sample_time, "throttle_sample_time");
#endif
/* legacy alias for logical_block_size: */
static struct queue_sysfs_entry queue_hw_sector_size_entry = {
.attr = {.name = "hw_sector_size", .mode = 0444 },
@ -640,9 +636,6 @@ static struct attribute *queue_attrs[] = {
&queue_fua_entry.attr,
&queue_dax_entry.attr,
&queue_poll_delay_entry.attr,
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
&blk_throtl_sample_time_entry.attr,
#endif
&queue_virt_boundary_mask_entry.attr,
&queue_dma_alignment_entry.attr,
NULL,

888
block/blk-throttle.c
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File diff suppressed because it is too large Load Diff

26
block/blk-throttle.h
View File

@ -58,12 +58,6 @@ enum tg_state_flags {
THROTL_TG_CANCELING = 1 << 2, /* starts to cancel bio */
};
enum {
LIMIT_LOW,
LIMIT_MAX,
LIMIT_CNT,
};
struct throtl_grp {
/* must be the first member */
struct blkg_policy_data pd;
@ -102,14 +96,14 @@ struct throtl_grp {
bool has_rules_iops[2];
/* internally used bytes per second rate limits */
uint64_t bps[2][LIMIT_CNT];
uint64_t bps[2];
/* user configured bps limits */
uint64_t bps_conf[2][LIMIT_CNT];
uint64_t bps_conf[2];
/* internally used IOPS limits */
unsigned int iops[2][LIMIT_CNT];
unsigned int iops[2];
/* user configured IOPS limits */
unsigned int iops_conf[2][LIMIT_CNT];
unsigned int iops_conf[2];
/* Number of bytes dispatched in current slice */
uint64_t bytes_disp[2];
@ -132,22 +126,10 @@ struct throtl_grp {
unsigned long last_check_time;
unsigned long latency_target; /* us */
unsigned long latency_target_conf; /* us */
/* When did we start a new slice */
unsigned long slice_start[2];
unsigned long slice_end[2];
unsigned long last_finish_time; /* ns / 1024 */
unsigned long checked_last_finish_time; /* ns / 1024 */
unsigned long avg_idletime; /* ns / 1024 */
unsigned long idletime_threshold; /* us */
unsigned long idletime_threshold_conf; /* us */
unsigned int bio_cnt; /* total bios */
unsigned int bad_bio_cnt; /* bios exceeding latency threshold */
unsigned long bio_cnt_reset_time;
struct blkg_rwstat stat_bytes;
struct blkg_rwstat stat_ios;
};

11
block/blk.h
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@ -388,17 +388,6 @@ static inline void ioc_clear_queue(struct request_queue *q)
}
#endif /* CONFIG_BLK_ICQ */
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page);
extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
const char *page, size_t count);
extern void blk_throtl_bio_endio(struct bio *bio);
extern void blk_throtl_stat_add(struct request *rq, u64 time);
#else
static inline void blk_throtl_bio_endio(struct bio *bio) { }
static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
#endif
struct bio *__blk_queue_bounce(struct bio *bio, struct request_queue *q);
static inline bool blk_queue_may_bounce(struct request_queue *q)