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Date: Tue, 10 May 2016 17:16:37 -0700
From: Shaohua Li <shli@...com>
To: <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <tj@...nel.org>, <vgoyal@...hat.com>, <axboe@...com>,
<jmoyer@...hat.com>, <Kernel-team@...com>
Subject: [PATCH 07/10] block-throttle: add .high interface
Add high limit for cgroup and corresponding cgroup interface.
Signed-off-by: Shaohua Li <shli@...com>
---
block/blk-throttle.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 69 insertions(+), 5 deletions(-)
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index a462e2f..5736d1b 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -87,8 +87,9 @@ enum tg_state_flags {
enum {
LIMIT_LOW = 0,
- LIMIT_MAX = 1,
- LIMIT_CNT = 2,
+ LIMIT_HIGH = 1,
+ LIMIT_MAX = 2,
+ LIMIT_CNT = 3,
};
struct throtl_grp {
@@ -240,6 +241,8 @@ static uint64_t tg_bps_limit(struct throtl_grp *tg, int rw)
/* assign a small default */
return 64 * 1024;
}
+ if (ret == -1 && tg->td->limit_index == LIMIT_HIGH)
+ return tg->bps[rw][LIMIT_MAX];
return ret;
}
@@ -258,6 +261,8 @@ static unsigned int tg_iops_limit(struct throtl_grp *tg, int rw)
/* assign a small default */
return 16;
}
+ if (ret == -1 && tg->td->limit_index == LIMIT_HIGH)
+ return tg->iops[rw][LIMIT_MAX];
return ret;
}
@@ -399,7 +404,7 @@ static struct blkg_policy_data *throtl_pd_alloc(gfp_t gfp, int node)
RB_CLEAR_NODE(&tg->rb_node);
for (rw = READ; rw <= WRITE; rw++) {
- for (index = LIMIT_MAX; index < LIMIT_CNT; index++) {
+ for (index = LIMIT_HIGH; index < LIMIT_CNT; index++) {
tg->bps[rw][index] = -1;
tg->iops[rw][index] = -1;
}
@@ -466,6 +471,7 @@ static void blk_throtl_update_valid_limit(struct throtl_data *td)
struct cgroup_subsys_state *pos_css;
struct blkcg_gq *blkg;
bool low_valid = false;
+ bool high_valid = false;
blkg_for_each_descendant_post(blkg, pos_css, td->queue->root_blkg) {
struct throtl_grp *tg = blkg_to_tg(blkg);
@@ -475,12 +481,21 @@ static void blk_throtl_update_valid_limit(struct throtl_data *td)
tg->iops[READ][LIMIT_LOW] ||
tg->iops[WRITE][LIMIT_LOW])
low_valid = true;
+ if (tg->bps[READ][LIMIT_HIGH] != -1 ||
+ tg->bps[WRITE][LIMIT_HIGH] != -1 ||
+ tg->iops[READ][LIMIT_HIGH] != -1 ||
+ tg->iops[WRITE][LIMIT_HIGH] != -1)
+ high_valid = true;
}
if (low_valid)
td->limit_valid[LIMIT_LOW] = true;
else
td->limit_valid[LIMIT_LOW] = false;
+ if (high_valid)
+ td->limit_valid[LIMIT_HIGH] = true;
+ else
+ td->limit_valid[LIMIT_HIGH] = false;
}
static void throtl_upgrade_state(struct throtl_data *td);
@@ -492,6 +507,10 @@ static void throtl_pd_offline(struct blkg_policy_data *pd)
tg->bps[WRITE][LIMIT_LOW] = 0;
tg->iops[READ][LIMIT_LOW] = 0;
tg->iops[WRITE][LIMIT_LOW] = 0;
+ tg->bps[READ][LIMIT_HIGH] = -1;
+ tg->bps[WRITE][LIMIT_HIGH] = -1;
+ tg->iops[READ][LIMIT_HIGH] = -1;
+ tg->iops[WRITE][LIMIT_HIGH] = -1;
blk_throtl_update_valid_limit(tg->td);
@@ -1476,7 +1495,15 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of,
if (v[0] < tg->bps[READ][LIMIT_LOW] ||
v[1] < tg->bps[WRITE][LIMIT_LOW] ||
v[2] < tg->iops[READ][LIMIT_LOW] ||
- v[3] < tg->iops[WRITE][LIMIT_LOW]) {
+ v[3] < tg->iops[WRITE][LIMIT_LOW] ||
+ (tg->bps[READ][LIMIT_HIGH] != -1 &&
+ v[0] < tg->bps[READ][LIMIT_HIGH]) ||
+ (tg->bps[WRITE][LIMIT_HIGH] != -1 &&
+ v[1] < tg->bps[WRITE][LIMIT_HIGH]) ||
+ (tg->iops[READ][LIMIT_HIGH] != -1 &&
+ v[2] < tg->iops[READ][LIMIT_HIGH]) ||
+ (tg->iops[WRITE][LIMIT_HIGH] != -1 &&
+ v[3] < tg->iops[WRITE][LIMIT_HIGH])) {
ret = -EINVAL;
goto out_finish;
}
@@ -1484,7 +1511,27 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of,
if (v[0] > tg->bps[READ][LIMIT_MAX] ||
v[1] > tg->bps[WRITE][LIMIT_MAX] ||
v[2] > tg->iops[READ][LIMIT_MAX] ||
- v[3] > tg->iops[WRITE][LIMIT_MAX]) {
+ v[3] > tg->iops[WRITE][LIMIT_MAX] ||
+ (tg->bps[READ][LIMIT_HIGH] != -1 &&
+ v[0] > tg->bps[READ][LIMIT_HIGH]) ||
+ (tg->bps[WRITE][LIMIT_HIGH] != -1 &&
+ v[1] > tg->bps[WRITE][LIMIT_HIGH]) ||
+ (tg->iops[READ][LIMIT_HIGH] != -1 &&
+ v[2] > tg->iops[READ][LIMIT_HIGH]) ||
+ (tg->iops[WRITE][LIMIT_HIGH] != -1 &&
+ v[3] > tg->iops[WRITE][LIMIT_HIGH])) {
+ ret = -EINVAL;
+ goto out_finish;
+ }
+ } else if (index == LIMIT_HIGH) {
+ if ((v[0] != -1 && (v[0] < tg->bps[READ][LIMIT_LOW] ||
+ v[0] > tg->bps[READ][LIMIT_MAX])) ||
+ (v[1] != -1 && (v[1] < tg->bps[WRITE][LIMIT_LOW] ||
+ v[1] > tg->bps[WRITE][LIMIT_MAX])) ||
+ (v[2] != -1 && (v[2] < tg->iops[READ][LIMIT_LOW] ||
+ v[2] > tg->iops[READ][LIMIT_MAX])) ||
+ (v[3] != -1 && (v[3] < tg->iops[WRITE][LIMIT_LOW] ||
+ v[3] > tg->iops[WRITE][LIMIT_MAX]))) {
ret = -EINVAL;
goto out_finish;
}
@@ -1499,6 +1546,15 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of,
if (tg->td->limit_valid[LIMIT_LOW])
tg->td->limit_index = LIMIT_LOW;
}
+ if (index == LIMIT_HIGH) {
+ blk_throtl_update_valid_limit(tg->td);
+ if (tg->td->limit_valid[LIMIT_HIGH] &&
+ tg->td->limit_index == LIMIT_MAX)
+ tg->td->limit_index = LIMIT_HIGH;
+ }
+ if (index == LIMIT_MAX && tg->td->limit_index == LIMIT_MAX &&
+ tg->td->limit_valid[LIMIT_HIGH])
+ tg->td->limit_index = LIMIT_HIGH;
tg_conf_updated(tg);
ret = 0;
out_finish:
@@ -1515,6 +1571,13 @@ static struct cftype throtl_files[] = {
.private = LIMIT_LOW,
},
{
+ .name = "high",
+ .flags = CFTYPE_NOT_ON_ROOT,
+ .seq_show = tg_print_limit,
+ .write = tg_set_limit,
+ .private = LIMIT_HIGH,
+ },
+ {
.name = "max",
.flags = CFTYPE_NOT_ON_ROOT,
.seq_show = tg_print_limit,
@@ -1988,6 +2051,7 @@ int blk_throtl_init(struct request_queue *q)
td->queue = q;
td->limit_valid[LIMIT_LOW] = false;
+ td->limit_valid[LIMIT_HIGH] = false;
td->limit_valid[LIMIT_MAX] = true;
td->limit_index = LIMIT_MAX;
td->low_upgrade_time = jiffies;
--
2.8.0.rc2
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