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blk-throttle: Fix incorrect display of io.max 

Commit bf20ab538c ("blk-throttle: remove CONFIG_BLK_DEV_THROTTLING_LOW")
attempts to revert the code change introduced by commit cd5ab1b0fc
("blk-throttle: add .low interface").  However, it leaves behind the
bps_conf[] and iops_conf[] fields in the throtl_grp structure which
aren't set anywhere in the new blk-throttle.c code but are still being
used by tg_prfill_limit() to display the limits in io.max. Now io.max
always displays the following values if a block queue is used:

	<m>:<n> rbps=0 wbps=0 riops=0 wiops=0

Fix this problem by removing bps_conf[] and iops_conf[] and use bps[]
and iops[] instead to complete the revert.

Fixes: bf20ab538c ("blk-throttle: remove CONFIG_BLK_DEV_THROTTLING_LOW")
Reported-by: Justin Forbes <jforbes@redhat.com>
Closes: https://github.com/containers/podman/issues/22701#issuecomment-2120627789
Signed-off-by: Waiman Long <longman@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20240530134547.970075-1-longman@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Waiman Long 2024-05-30 09:45:47 -04:00 committed by Jens Axboe
parent 29459c3eaa
commit 0a751df456
2 changed files with 14 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
block/blk-throttle.c
View File

@ -1399,32 +1399,32 @@ static u64 tg_prfill_limit(struct seq_file *sf, struct blkg_policy_data *pd,
bps_dft = U64_MAX;
iops_dft = UINT_MAX;
if (tg->bps_conf[READ] == bps_dft &&
tg->bps_conf[WRITE] == bps_dft &&
tg->iops_conf[READ] == iops_dft &&
tg->iops_conf[WRITE] == iops_dft)
if (tg->bps[READ] == bps_dft &&
tg->bps[WRITE] == bps_dft &&
tg->iops[READ] == iops_dft &&
tg->iops[WRITE] == iops_dft)
return 0;
seq_printf(sf, "%s", dname);
if (tg->bps_conf[READ] == U64_MAX)
if (tg->bps[READ] == U64_MAX)
seq_printf(sf, " rbps=max");
else
seq_printf(sf, " rbps=%llu", tg->bps_conf[READ]);
seq_printf(sf, " rbps=%llu", tg->bps[READ]);
if (tg->bps_conf[WRITE] == U64_MAX)
if (tg->bps[WRITE] == U64_MAX)
seq_printf(sf, " wbps=max");
else
seq_printf(sf, " wbps=%llu", tg->bps_conf[WRITE]);
seq_printf(sf, " wbps=%llu", tg->bps[WRITE]);
if (tg->iops_conf[READ] == UINT_MAX)
if (tg->iops[READ] == UINT_MAX)
seq_printf(sf, " riops=max");
else
seq_printf(sf, " riops=%u", tg->iops_conf[READ]);
seq_printf(sf, " riops=%u", tg->iops[READ]);
if (tg->iops_conf[WRITE] == UINT_MAX)
if (tg->iops[WRITE] == UINT_MAX)
seq_printf(sf, " wiops=max");
else
seq_printf(sf, " wiops=%u", tg->iops_conf[WRITE]);
seq_printf(sf, " wiops=%u", tg->iops[WRITE]);
seq_printf(sf, "\n");
return 0;

8
block/blk-throttle.h
View File

@ -95,15 +95,11 @@ struct throtl_grp {
bool has_rules_bps[2];
bool has_rules_iops[2];
/* internally used bytes per second rate limits */
/* bytes per second rate limits */
uint64_t bps[2];
/* user configured bps limits */
uint64_t bps_conf[2];
/* internally used IOPS limits */
/* IOPS limits */
unsigned int iops[2];
/* user configured IOPS limits */
unsigned int iops_conf[2];
/* Number of bytes dispatched in current slice */
uint64_t bytes_disp[2];