mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 17:35:07 +07:00
22f17952c7
With the change to use UINT_MAX I broke the depth check as any value of inflight (ie 0) would be less than (int)UINT_MAX. Fix this by changing everything to unsigned int to match the depth. Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
195 lines
4.1 KiB
C
195 lines
4.1 KiB
C
#include "blk-rq-qos.h"
|
|
|
|
/*
|
|
* Increment 'v', if 'v' is below 'below'. Returns true if we succeeded,
|
|
* false if 'v' + 1 would be bigger than 'below'.
|
|
*/
|
|
static bool atomic_inc_below(atomic_t *v, unsigned int below)
|
|
{
|
|
unsigned int cur = atomic_read(v);
|
|
|
|
for (;;) {
|
|
unsigned int old;
|
|
|
|
if (cur >= below)
|
|
return false;
|
|
old = atomic_cmpxchg(v, cur, cur + 1);
|
|
if (old == cur)
|
|
break;
|
|
cur = old;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool rq_wait_inc_below(struct rq_wait *rq_wait, unsigned int limit)
|
|
{
|
|
return atomic_inc_below(&rq_wait->inflight, limit);
|
|
}
|
|
|
|
void rq_qos_cleanup(struct request_queue *q, struct bio *bio)
|
|
{
|
|
struct rq_qos *rqos;
|
|
|
|
for (rqos = q->rq_qos; rqos; rqos = rqos->next) {
|
|
if (rqos->ops->cleanup)
|
|
rqos->ops->cleanup(rqos, bio);
|
|
}
|
|
}
|
|
|
|
void rq_qos_done(struct request_queue *q, struct request *rq)
|
|
{
|
|
struct rq_qos *rqos;
|
|
|
|
for (rqos = q->rq_qos; rqos; rqos = rqos->next) {
|
|
if (rqos->ops->done)
|
|
rqos->ops->done(rqos, rq);
|
|
}
|
|
}
|
|
|
|
void rq_qos_issue(struct request_queue *q, struct request *rq)
|
|
{
|
|
struct rq_qos *rqos;
|
|
|
|
for(rqos = q->rq_qos; rqos; rqos = rqos->next) {
|
|
if (rqos->ops->issue)
|
|
rqos->ops->issue(rqos, rq);
|
|
}
|
|
}
|
|
|
|
void rq_qos_requeue(struct request_queue *q, struct request *rq)
|
|
{
|
|
struct rq_qos *rqos;
|
|
|
|
for(rqos = q->rq_qos; rqos; rqos = rqos->next) {
|
|
if (rqos->ops->requeue)
|
|
rqos->ops->requeue(rqos, rq);
|
|
}
|
|
}
|
|
|
|
void rq_qos_throttle(struct request_queue *q, struct bio *bio,
|
|
spinlock_t *lock)
|
|
{
|
|
struct rq_qos *rqos;
|
|
|
|
for(rqos = q->rq_qos; rqos; rqos = rqos->next) {
|
|
if (rqos->ops->throttle)
|
|
rqos->ops->throttle(rqos, bio, lock);
|
|
}
|
|
}
|
|
|
|
void rq_qos_track(struct request_queue *q, struct request *rq, struct bio *bio)
|
|
{
|
|
struct rq_qos *rqos;
|
|
|
|
for(rqos = q->rq_qos; rqos; rqos = rqos->next) {
|
|
if (rqos->ops->track)
|
|
rqos->ops->track(rqos, rq, bio);
|
|
}
|
|
}
|
|
|
|
void rq_qos_done_bio(struct request_queue *q, struct bio *bio)
|
|
{
|
|
struct rq_qos *rqos;
|
|
|
|
for(rqos = q->rq_qos; rqos; rqos = rqos->next) {
|
|
if (rqos->ops->done_bio)
|
|
rqos->ops->done_bio(rqos, bio);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return true, if we can't increase the depth further by scaling
|
|
*/
|
|
bool rq_depth_calc_max_depth(struct rq_depth *rqd)
|
|
{
|
|
unsigned int depth;
|
|
bool ret = false;
|
|
|
|
/*
|
|
* For QD=1 devices, this is a special case. It's important for those
|
|
* to have one request ready when one completes, so force a depth of
|
|
* 2 for those devices. On the backend, it'll be a depth of 1 anyway,
|
|
* since the device can't have more than that in flight. If we're
|
|
* scaling down, then keep a setting of 1/1/1.
|
|
*/
|
|
if (rqd->queue_depth == 1) {
|
|
if (rqd->scale_step > 0)
|
|
rqd->max_depth = 1;
|
|
else {
|
|
rqd->max_depth = 2;
|
|
ret = true;
|
|
}
|
|
} else {
|
|
/*
|
|
* scale_step == 0 is our default state. If we have suffered
|
|
* latency spikes, step will be > 0, and we shrink the
|
|
* allowed write depths. If step is < 0, we're only doing
|
|
* writes, and we allow a temporarily higher depth to
|
|
* increase performance.
|
|
*/
|
|
depth = min_t(unsigned int, rqd->default_depth,
|
|
rqd->queue_depth);
|
|
if (rqd->scale_step > 0)
|
|
depth = 1 + ((depth - 1) >> min(31, rqd->scale_step));
|
|
else if (rqd->scale_step < 0) {
|
|
unsigned int maxd = 3 * rqd->queue_depth / 4;
|
|
|
|
depth = 1 + ((depth - 1) << -rqd->scale_step);
|
|
if (depth > maxd) {
|
|
depth = maxd;
|
|
ret = true;
|
|
}
|
|
}
|
|
|
|
rqd->max_depth = depth;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void rq_depth_scale_up(struct rq_depth *rqd)
|
|
{
|
|
/*
|
|
* Hit max in previous round, stop here
|
|
*/
|
|
if (rqd->scaled_max)
|
|
return;
|
|
|
|
rqd->scale_step--;
|
|
|
|
rqd->scaled_max = rq_depth_calc_max_depth(rqd);
|
|
}
|
|
|
|
/*
|
|
* Scale rwb down. If 'hard_throttle' is set, do it quicker, since we
|
|
* had a latency violation.
|
|
*/
|
|
void rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle)
|
|
{
|
|
/*
|
|
* Stop scaling down when we've hit the limit. This also prevents
|
|
* ->scale_step from going to crazy values, if the device can't
|
|
* keep up.
|
|
*/
|
|
if (rqd->max_depth == 1)
|
|
return;
|
|
|
|
if (rqd->scale_step < 0 && hard_throttle)
|
|
rqd->scale_step = 0;
|
|
else
|
|
rqd->scale_step++;
|
|
|
|
rqd->scaled_max = false;
|
|
rq_depth_calc_max_depth(rqd);
|
|
}
|
|
|
|
void rq_qos_exit(struct request_queue *q)
|
|
{
|
|
while (q->rq_qos) {
|
|
struct rq_qos *rqos = q->rq_qos;
|
|
q->rq_qos = rqos->next;
|
|
rqos->ops->exit(rqos);
|
|
}
|
|
}
|