diff options
Diffstat (limited to 'block/blk-throttle.c')
| -rw-r--r-- | block/blk-throttle.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 0ea8698b2b1f..6e1c29860eec 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -25,6 +25,8 @@ static int throtl_quantum = 32; #define DFL_IDLE_THRESHOLD_SSD (1000L) /* 1 ms */ #define DFL_IDLE_THRESHOLD_HD (100L * 1000) /* 100 ms */ #define MAX_IDLE_TIME (5L * 1000 * 1000) /* 5 s */ +/* default latency target is 0, eg, guarantee IO latency by default */ +#define DFL_LATENCY_TARGET (0) static struct blkcg_policy blkcg_policy_throtl; @@ -152,6 +154,7 @@ struct throtl_grp { unsigned long last_check_time; + unsigned long latency_target; /* us */ /* When did we start a new slice */ unsigned long slice_start[2]; unsigned long slice_end[2]; @@ -449,6 +452,8 @@ static struct blkg_policy_data *throtl_pd_alloc(gfp_t gfp, int node) tg->iops_conf[WRITE][LIMIT_MAX] = UINT_MAX; /* LIMIT_LOW will have default value 0 */ + tg->latency_target = DFL_LATENCY_TARGET; + return &tg->pd; } @@ -1445,6 +1450,7 @@ static u64 tg_prfill_limit(struct seq_file *sf, struct blkg_policy_data *pd, u64 bps_dft; unsigned int iops_dft; char idle_time[26] = ""; + char latency_time[26] = ""; if (!dname) return 0; @@ -1461,8 +1467,9 @@ static u64 tg_prfill_limit(struct seq_file *sf, struct blkg_policy_data *pd, tg->bps_conf[WRITE][off] == bps_dft && tg->iops_conf[READ][off] == iops_dft && tg->iops_conf[WRITE][off] == iops_dft && - (off != LIMIT_LOW || tg->idletime_threshold == - tg->td->dft_idletime_threshold)) + (off != LIMIT_LOW || + (tg->idletime_threshold == tg->td->dft_idletime_threshold && + tg->latency_target == DFL_LATENCY_TARGET))) return 0; if (tg->bps_conf[READ][off] != bps_dft) @@ -1483,10 +1490,17 @@ static u64 tg_prfill_limit(struct seq_file *sf, struct blkg_policy_data *pd, else snprintf(idle_time, sizeof(idle_time), " idle=%lu", tg->idletime_threshold); + + if (tg->latency_target == ULONG_MAX) + strcpy(latency_time, " latency=max"); + else + snprintf(latency_time, sizeof(latency_time), + " latency=%lu", tg->latency_target); } - 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); + seq_printf(sf, "%s rbps=%s wbps=%s riops=%s wiops=%s%s%s\n", + dname, bufs[0], bufs[1], bufs[2], bufs[3], idle_time, + latency_time); return 0; } @@ -1505,6 +1519,7 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of, struct throtl_grp *tg; u64 v[4]; unsigned long idle_time; + unsigned long latency_time; int ret; int index = of_cft(of)->private; @@ -1520,6 +1535,7 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of, v[3] = tg->iops_conf[WRITE][index]; idle_time = tg->idletime_threshold; + latency_time = tg->latency_target; while (true) { char tok[27]; /* wiops=18446744073709551616 */ char *p; @@ -1553,6 +1569,8 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of, v[3] = min_t(u64, val, UINT_MAX); else if (off == LIMIT_LOW && !strcmp(tok, "idle")) idle_time = val; + else if (off == LIMIT_LOW && !strcmp(tok, "latency")) + latency_time = val; else goto out_finish; } @@ -1583,6 +1601,8 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of, tg->td->limit_index = LIMIT_LOW; tg->idletime_threshold = (idle_time == ULONG_MAX) ? ULONG_MAX : idle_time; + tg->latency_target = (latency_time == ULONG_MAX) ? + ULONG_MAX : latency_time; } tg_conf_updated(tg); ret = 0; |