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blk-throttle: add interface to configure idle time threshold 

Add interface to configure the threshold. The io.low interface will
like:
echo "8:16 rbps=2097152 wbps=max idle=2000" > io.low

idle is in microsecond unit.

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Shaohua Li 2017-03-27 10:51:42 -07:00 committed by Jens Axboe
parent 9e234eeafb
commit ada75b6e5b
1 changed files with 28 additions and 13 deletions
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41
block/blk-throttle.c
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@ -181,6 +181,8 @@ struct throtl_data
unsigned int limit_index;
bool limit_valid[LIMIT_CNT];
unsigned long dft_idletime_threshold; /* us */
unsigned long low_upgrade_time;
unsigned long low_downgrade_time;
@ -477,10 +479,7 @@ static void throtl_pd_init(struct blkg_policy_data *pd)
sq->parent_sq = &blkg_to_tg(blkg->parent)->service_queue;
tg->td = td;
if (blk_queue_nonrot(td->queue))
tg->idletime_threshold = DFL_IDLE_THRESHOLD_SSD;
else
tg->idletime_threshold = DFL_IDLE_THRESHOLD_HD;
tg->idletime_threshold = td->dft_idletime_threshold;
}
/*
@ -1449,6 +1448,7 @@ static u64 tg_prfill_limit(struct seq_file *sf, struct blkg_policy_data *pd,
char bufs[4][21] = { "max", "max", "max", "max" };
u64 bps_dft;
unsigned int iops_dft;
char idle_time[26] = "";
if (!dname)
return 0;
@ -1464,7 +1464,9 @@ static u64 tg_prfill_limit(struct seq_file *sf, struct blkg_policy_data *pd,
if (tg->bps_conf[READ][off] == bps_dft &&
tg->bps_conf[WRITE][off] == bps_dft &&
tg->iops_conf[READ][off] == iops_dft &&
tg->iops_conf[WRITE][off] == iops_dft)
tg->iops_conf[WRITE][off] == iops_dft &&
(off != LIMIT_LOW || tg->idletime_threshold ==
tg->td->dft_idletime_threshold))
return 0;
if (tg->bps_conf[READ][off] != bps_dft)
@ -1479,9 +1481,16 @@ static u64 tg_prfill_limit(struct seq_file *sf, struct blkg_policy_data *pd,
if (tg->iops_conf[WRITE][off] != iops_dft)
snprintf(bufs[3], sizeof(bufs[3]), "%u",
tg->iops_conf[WRITE][off]);
if (off == LIMIT_LOW) {
if (tg->idletime_threshold == ULONG_MAX)
strcpy(idle_time, " idle=max");
else
snprintf(idle_time, sizeof(idle_time), " idle=%lu",
tg->idletime_threshold);
}
seq_printf(sf, "%s rbps=%s wbps=%s riops=%s wiops=%s\n",
dname, bufs[0], bufs[1], bufs[2], bufs[3]);
seq_printf(sf, "%s rbps=%s wbps=%s riops=%s wiops=%s%s\n",
dname, bufs[0], bufs[1], bufs[2], bufs[3], idle_time);
return 0;
}
@ -1499,6 +1508,7 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of,
struct blkg_conf_ctx ctx;
struct throtl_grp *tg;
u64 v[4];
unsigned long idle_time;
int ret;
int index = of_cft(of)->private;
@ -1513,6 +1523,7 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of,
v[2] = tg->iops_conf[READ][index];
v[3] = tg->iops_conf[WRITE][index];
idle_time = tg->idletime_threshold;
while (true) {
char tok[27]; /* wiops=18446744073709551616 */
char *p;
@ -1544,6 +1555,8 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of,
v[2] = min_t(u64, val, UINT_MAX);
else if (!strcmp(tok, "wiops"))
v[3] = min_t(u64, val, UINT_MAX);
else if (off == LIMIT_LOW && !strcmp(tok, "idle"))
idle_time = val;
else
goto out_finish;
}
@ -1572,6 +1585,8 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of,
blk_throtl_update_limit_valid(tg->td);
if (tg->td->limit_valid[LIMIT_LOW])
tg->td->limit_index = LIMIT_LOW;
tg->idletime_threshold = (idle_time == ULONG_MAX) ?
ULONG_MAX : idle_time;
}
tg_conf_updated(tg);
ret = 0;
@ -2122,10 +2137,13 @@ void blk_throtl_register_queue(struct request_queue *q)
td = q->td;
BUG_ON(!td);
if (blk_queue_nonrot(q))
if (blk_queue_nonrot(q)) {
td->throtl_slice = DFL_THROTL_SLICE_SSD;
else
td->dft_idletime_threshold = DFL_IDLE_THRESHOLD_SSD;
} else {
td->throtl_slice = DFL_THROTL_SLICE_HD;
td->dft_idletime_threshold = DFL_IDLE_THRESHOLD_HD;
}
#ifndef CONFIG_BLK_DEV_THROTTLING_LOW
/* if no low limit, use previous default */
td->throtl_slice = DFL_THROTL_SLICE_HD;
@ -2139,10 +2157,7 @@ void blk_throtl_register_queue(struct request_queue *q)
blkg_for_each_descendant_post(blkg, pos_css, q->root_blkg) {
struct throtl_grp *tg = blkg_to_tg(blkg);
if (blk_queue_nonrot(q))
tg->idletime_threshold = DFL_IDLE_THRESHOLD_SSD;
else
tg->idletime_threshold = DFL_IDLE_THRESHOLD_HD;
tg->idletime_threshold = td->dft_idletime_threshold;
}
rcu_read_unlock();
}