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Merge 0460375517 ("blk-iocost: restore inuse update tracepoints") into android-mailine

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Bisection on the way to 5.10-rc1

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I3f67860c970bea3019c374ba34e051ca78282a92
This commit is contained in:
Greg Kroah-Hartman
2020-10-24 13:14:34 +02:00
parent b5a717365a 0460375517
commit 6c45f08d88
3 changed files with 244 additions and 103 deletions
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23
block/blk-cgroup.c
View File

@@ -1613,16 +1613,24 @@ static void blkcg_scale_delay(struct blkcg_gq *blkg, u64 now)
static void blkcg_maybe_throttle_blkg(struct blkcg_gq *blkg, bool use_memdelay)
{
unsigned long pflags;
bool clamp;
u64 now = ktime_to_ns(ktime_get());
u64 exp;
u64 delay_nsec = 0;
int tok;
while (blkg->parent) {
if (atomic_read(&blkg->use_delay)) {
int use_delay = atomic_read(&blkg->use_delay);
if (use_delay) {
u64 this_delay;
blkcg_scale_delay(blkg, now);
delay_nsec = max_t(u64, delay_nsec,
atomic64_read(&blkg->delay_nsec));
this_delay = atomic64_read(&blkg->delay_nsec);
if (this_delay > delay_nsec) {
delay_nsec = this_delay;
clamp = use_delay > 0;
}
}
blkg = blkg->parent;
}
@@ -1634,10 +1642,13 @@ static void blkcg_maybe_throttle_blkg(struct blkcg_gq *blkg, bool use_memdelay)
* Let's not sleep for all eternity if we've amassed a huge delay.
* Swapping or metadata IO can accumulate 10's of seconds worth of
* delay, and we want userspace to be able to do _something_ so cap the
* delays at 1 second. If there's 10's of seconds worth of delay then
* the tasks will be delayed for 1 second for every syscall.
* delays at 0.25s. If there's 10's of seconds worth of delay then the
* tasks will be delayed for 0.25 second for every syscall. If
* blkcg_set_delay() was used as indicated by negative use_delay, the
* caller is responsible for regulating the range.
*/
delay_nsec = min_t(u64, delay_nsec, 250 * NSEC_PER_MSEC);
if (clamp)
delay_nsec = min_t(u64, delay_nsec, 250 * NSEC_PER_MSEC);
if (use_memdelay)
psi_memstall_enter(&pflags);

318
block/blk-iocost.c
View File

@@ -224,20 +224,12 @@ enum {
MARGIN_MIN_PCT = 10,
MARGIN_LOW_PCT = 20,
MARGIN_TARGET_PCT = 50,
MARGIN_MAX_PCT = 100,
INUSE_ADJ_STEP_PCT = 25,
/* Have some play in timer operations */
TIMER_SLACK_PCT = 1,
/*
* vtime can wrap well within a reasonable uptime when vrate is
* consistently raised. Don't trust recorded cgroup vtime if the
* period counter indicates that it's older than 5mins.
*/
VTIME_VALID_DUR = 300 * USEC_PER_SEC,
/* 1/64k is granular enough and can easily be handled w/ u32 */
WEIGHT_ONE = 1 << 16,
@@ -270,6 +262,38 @@ enum {
/* unbusy hysterisis */
UNBUSY_THR_PCT = 75,
/*
* The effect of delay is indirect and non-linear and a huge amount of
* future debt can accumulate abruptly while unthrottled. Linearly scale
* up delay as debt is going up and then let it decay exponentially.
* This gives us quick ramp ups while delay is accumulating and long
* tails which can help reducing the frequency of debt explosions on
* unthrottle. The parameters are experimentally determined.
*
* The delay mechanism provides adequate protection and behavior in many
* cases. However, this is far from ideal and falls shorts on both
* fronts. The debtors are often throttled too harshly costing a
* significant level of fairness and possibly total work while the
* protection against their impacts on the system can be choppy and
* unreliable.
*
* The shortcoming primarily stems from the fact that, unlike for page
* cache, the kernel doesn't have well-defined back-pressure propagation
* mechanism and policies for anonymous memory. Fully addressing this
* issue will likely require substantial improvements in the area.
*/
MIN_DELAY_THR_PCT = 500,
MAX_DELAY_THR_PCT = 25000,
MIN_DELAY = 250,
MAX_DELAY = 250 * USEC_PER_MSEC,
/*
* Halve debts if total usage keeps staying under 25% w/o any shortages
* for over 100ms.
*/
DEBT_BUSY_USAGE_PCT = 25,
DEBT_REDUCTION_IDLE_DUR = 100 * USEC_PER_MSEC,
/* don't let cmds which take a very long time pin lagging for too long */
MAX_LAGGING_PERIODS = 10,
@@ -363,7 +387,6 @@ struct ioc_margins {
s64 min;
s64 low;
s64 target;
s64 max;
};
struct ioc_missed {
@@ -400,6 +423,8 @@ struct ioc {
enum ioc_running running;
atomic64_t vtime_rate;
u64 vtime_base_rate;
s64 vtime_err;
seqcount_spinlock_t period_seqcount;
u64 period_at; /* wallclock starttime */
@@ -411,6 +436,9 @@ struct ioc {
bool weights_updated;
atomic_t hweight_gen; /* for lazy hweights */
/* the last time debt cancel condition wasn't met */
u64 debt_busy_at;
u64 autop_too_fast_at;
u64 autop_too_slow_at;
int autop_idx;
@@ -473,6 +501,10 @@ struct ioc_gq {
atomic64_t done_vtime;
u64 abs_vdebt;
/* current delay in effect and when it started */
u64 delay;
u64 delay_at;
/*
* The period this iocg was last active in. Used for deactivation
* and invalidating `vtime`.
@@ -495,7 +527,6 @@ struct ioc_gq {
struct wait_queue_head waitq;
struct hrtimer waitq_timer;
struct hrtimer delay_timer;
/* timestamp at the latest activation */
u64 activated_at;
@@ -722,12 +753,11 @@ static void ioc_refresh_margins(struct ioc *ioc)
{
struct ioc_margins *margins = &ioc->margins;
u32 period_us = ioc->period_us;
u64 vrate = atomic64_read(&ioc->vtime_rate);
u64 vrate = ioc->vtime_base_rate;
margins->min = (period_us * MARGIN_MIN_PCT / 100) * vrate;
margins->low = (period_us * MARGIN_LOW_PCT / 100) * vrate;
margins->target = (period_us * MARGIN_TARGET_PCT / 100) * vrate;
margins->max = (period_us * MARGIN_MAX_PCT / 100) * vrate;
}
/* latency Qos params changed, update period_us and all the dependent params */
@@ -793,8 +823,7 @@ static int ioc_autop_idx(struct ioc *ioc)
return idx;
/* step up/down based on the vrate */
vrate_pct = div64_u64(atomic64_read(&ioc->vtime_rate) * 100,
VTIME_PER_USEC);
vrate_pct = div64_u64(ioc->vtime_base_rate * 100, VTIME_PER_USEC);
now_ns = ktime_get_ns();
if (p->too_fast_vrate_pct && p->too_fast_vrate_pct <= vrate_pct) {
@@ -902,6 +931,43 @@ static bool ioc_refresh_params(struct ioc *ioc, bool force)
return true;
}
/*
* When an iocg accumulates too much vtime or gets deactivated, we throw away
* some vtime, which lowers the overall device utilization. As the exact amount
* which is being thrown away is known, we can compensate by accelerating the
* vrate accordingly so that the extra vtime generated in the current period
* matches what got lost.
*/
static void ioc_refresh_vrate(struct ioc *ioc, struct ioc_now *now)
{
s64 pleft = ioc->period_at + ioc->period_us - now->now;
s64 vperiod = ioc->period_us * ioc->vtime_base_rate;
s64 vcomp, vcomp_min, vcomp_max;
lockdep_assert_held(&ioc->lock);
/* we need some time left in this period */
if (pleft <= 0)
goto done;
/*
* Calculate how much vrate should be adjusted to offset the error.
* Limit the amount of adjustment and deduct the adjusted amount from
* the error.
*/
vcomp = -div64_s64(ioc->vtime_err, pleft);
vcomp_min = -(ioc->vtime_base_rate >> 1);
vcomp_max = ioc->vtime_base_rate;
vcomp = clamp(vcomp, vcomp_min, vcomp_max);
ioc->vtime_err += vcomp * pleft;
atomic64_set(&ioc->vtime_rate, ioc->vtime_base_rate + vcomp);
done:
/* bound how much error can accumulate */
ioc->vtime_err = clamp(ioc->vtime_err, -vperiod, vperiod);
}
/* take a snapshot of the current [v]time and vrate */
static void ioc_now(struct ioc *ioc, struct ioc_now *now)
{
@@ -1114,8 +1180,8 @@ static void weight_updated(struct ioc_gq *iocg, struct ioc_now *now)
static bool iocg_activate(struct ioc_gq *iocg, struct ioc_now *now)
{
struct ioc *ioc = iocg->ioc;
u64 last_period, cur_period, max_period_delta;
u64 vtime, vmin;
u64 last_period, cur_period;
u64 vtime, vtarget;
int i;
/*
@@ -1154,21 +1220,15 @@ static bool iocg_activate(struct ioc_gq *iocg, struct ioc_now *now)
goto fail_unlock;
/*
* vtime may wrap when vrate is raised substantially due to
* underestimated IO costs. Look at the period and ignore its
* vtime if the iocg has been idle for too long. Also, cap the
* budget it can start with to the margin.
* Always start with the target budget. On deactivation, we throw away
* anything above it.
*/
max_period_delta = DIV64_U64_ROUND_UP(VTIME_VALID_DUR, ioc->period_us);
vtarget = now->vnow - ioc->margins.target;
vtime = atomic64_read(&iocg->vtime);
vmin = now->vnow - ioc->margins.max;
if (last_period + max_period_delta < cur_period ||
time_before64(vtime, vmin)) {
atomic64_add(vmin - vtime, &iocg->vtime);
atomic64_add(vmin - vtime, &iocg->done_vtime);
vtime = vmin;
}
atomic64_add(vtarget - vtime, &iocg->vtime);
atomic64_add(vtarget - vtime, &iocg->done_vtime);
vtime = vtarget;
/*
* Activate, propagate weight and start period timer if not
@@ -1188,6 +1248,7 @@ static bool iocg_activate(struct ioc_gq *iocg, struct ioc_now *now)
if (ioc->running == IOC_IDLE) {
ioc->running = IOC_RUNNING;
ioc->debt_busy_at = now->now;
ioc_start_period(ioc, now);
}
@@ -1204,58 +1265,51 @@ static bool iocg_kick_delay(struct ioc_gq *iocg, struct ioc_now *now)
{
struct ioc *ioc = iocg->ioc;
struct blkcg_gq *blkg = iocg_to_blkg(iocg);
u64 vtime = atomic64_read(&iocg->vtime);
u64 delta_ns, expires, oexpires;
u64 tdelta, delay, new_delay;
s64 vover, vover_pct;
u32 hwa;
lockdep_assert_held(&iocg->waitq.lock);
/* debt-adjust vtime */
current_hweight(iocg, &hwa, NULL);
vtime += abs_cost_to_cost(iocg->abs_vdebt, hwa);
/* calculate the current delay in effect - 1/2 every second */
tdelta = now->now - iocg->delay_at;
if (iocg->delay)
delay = iocg->delay >> div64_u64(tdelta, USEC_PER_SEC);
else
delay = 0;
/*
* Clear or maintain depending on the overage. Non-zero vdebt is what
* guarantees that @iocg is online and future iocg_kick_delay() will
* clear use_delay. Don't leave it on when there's no vdebt.
*/
if (!iocg->abs_vdebt || time_before_eq64(vtime, now->vnow)) {
/* calculate the new delay from the debt amount */
current_hweight(iocg, &hwa, NULL);
vover = atomic64_read(&iocg->vtime) +
abs_cost_to_cost(iocg->abs_vdebt, hwa) - now->vnow;
vover_pct = div64_s64(100 * vover,
ioc->period_us * ioc->vtime_base_rate);
if (vover_pct <= MIN_DELAY_THR_PCT)
new_delay = 0;
else if (vover_pct >= MAX_DELAY_THR_PCT)
new_delay = MAX_DELAY;
else
new_delay = MIN_DELAY +
div_u64((MAX_DELAY - MIN_DELAY) *
(vover_pct - MIN_DELAY_THR_PCT),
MAX_DELAY_THR_PCT - MIN_DELAY_THR_PCT);
/* pick the higher one and apply */
if (new_delay > delay) {
iocg->delay = new_delay;
iocg->delay_at = now->now;
delay = new_delay;
}
if (delay >= MIN_DELAY) {
blkcg_set_delay(blkg, delay * NSEC_PER_USEC);
return true;
} else {
iocg->delay = 0;
blkcg_clear_delay(blkg);
return false;
}
if (!atomic_read(&blkg->use_delay) &&
time_before_eq64(vtime, now->vnow + ioc->margins.target))
return false;
/* use delay */
delta_ns = DIV64_U64_ROUND_UP(vtime - now->vnow,
now->vrate) * NSEC_PER_USEC;
blkcg_set_delay(blkg, delta_ns);
expires = now->now_ns + delta_ns;
/* if already active and close enough, don't bother */
oexpires = ktime_to_ns(hrtimer_get_softexpires(&iocg->delay_timer));
if (hrtimer_is_queued(&iocg->delay_timer) &&
abs(oexpires - expires) <= ioc->timer_slack_ns)
return true;
hrtimer_start_range_ns(&iocg->delay_timer, ns_to_ktime(expires),
ioc->timer_slack_ns, HRTIMER_MODE_ABS);
return true;
}
static enum hrtimer_restart iocg_delay_timer_fn(struct hrtimer *timer)
{
struct ioc_gq *iocg = container_of(timer, struct ioc_gq, delay_timer);
struct ioc_now now;
unsigned long flags;
spin_lock_irqsave(&iocg->waitq.lock, flags);
ioc_now(iocg->ioc, &now);
iocg_kick_delay(iocg, &now);
spin_unlock_irqrestore(&iocg->waitq.lock, flags);
return HRTIMER_NORESTART;
}
static void iocg_incur_debt(struct ioc_gq *iocg, u64 abs_cost,
@@ -1356,10 +1410,11 @@ static void iocg_kick_waitq(struct ioc_gq *iocg, bool pay_debt,
atomic64_add(vpay, &iocg->done_vtime);
iocg_pay_debt(iocg, abs_vpay, now);
vbudget -= vpay;
iocg_kick_delay(iocg, now);
}
if (iocg->abs_vdebt || iocg->delay)
iocg_kick_delay(iocg, now);
/*
* Debt can still be outstanding if we haven't paid all yet or the
* caller raced and called without @pay_debt. Shouldn't wake up waiters
@@ -1389,7 +1444,8 @@ static void iocg_kick_waitq(struct ioc_gq *iocg, bool pay_debt,
/* determine next wakeup, add a timer margin to guarantee chunking */
vshortage = -ctx.vbudget;
expires = now->now_ns +
DIV64_U64_ROUND_UP(vshortage, now->vrate) * NSEC_PER_USEC;
DIV64_U64_ROUND_UP(vshortage, ioc->vtime_base_rate) *
NSEC_PER_USEC;
expires += ioc->timer_slack_ns;
/* if already active and close enough, don't bother */
@@ -1504,6 +1560,7 @@ static void iocg_build_inner_walk(struct ioc_gq *iocg,
/* collect per-cpu counters and propagate the deltas to the parent */
static void iocg_flush_stat_one(struct ioc_gq *iocg, struct ioc_now *now)
{
struct ioc *ioc = iocg->ioc;
struct iocg_stat new_stat;
u64 abs_vusage = 0;
u64 vusage_delta;
@@ -1519,7 +1576,7 @@ static void iocg_flush_stat_one(struct ioc_gq *iocg, struct ioc_now *now)
vusage_delta = abs_vusage - iocg->last_stat_abs_vusage;
iocg->last_stat_abs_vusage = abs_vusage;
iocg->usage_delta_us = div64_u64(vusage_delta, now->vrate);
iocg->usage_delta_us = div64_u64(vusage_delta, ioc->vtime_base_rate);
iocg->local_stat.usage_us += iocg->usage_delta_us;
new_stat.usage_us =
@@ -1561,8 +1618,8 @@ static void iocg_flush_stat(struct list_head *target_iocgs, struct ioc_now *now)
* capacity. @hwm is the upper bound and used to signal no donation. This
* function also throws away @iocg's excess budget.
*/
static u32 hweight_after_donation(struct ioc_gq *iocg, u32 hwm, u32 usage,
struct ioc_now *now)
static u32 hweight_after_donation(struct ioc_gq *iocg, u32 old_hwi, u32 hwm,
u32 usage, struct ioc_now *now)
{
struct ioc *ioc = iocg->ioc;
u64 vtime = atomic64_read(&iocg->vtime);
@@ -1577,12 +1634,13 @@ static u32 hweight_after_donation(struct ioc_gq *iocg, u32 hwm, u32 usage,
time_after64(vtime, now->vnow - ioc->margins.min))
return hwm;
/* throw away excess above max */
excess = now->vnow - vtime - ioc->margins.max;
/* throw away excess above target */
excess = now->vnow - vtime - ioc->margins.target;
if (excess > 0) {
atomic64_add(excess, &iocg->vtime);
atomic64_add(excess, &iocg->done_vtime);
vtime += excess;
ioc->vtime_err -= div64_u64(excess * old_hwi, WEIGHT_ONE);
}
/*
@@ -1861,6 +1919,12 @@ static void transfer_surpluses(struct list_head *surpluses, struct ioc_now *now)
inuse = DIV64_U64_ROUND_UP(
parent->child_adjusted_sum * iocg->hweight_after_donation,
parent->hweight_inuse);
TRACE_IOCG_PATH(inuse_transfer, iocg, now,
iocg->inuse, inuse,
iocg->hweight_inuse,
iocg->hweight_after_donation);
__propagate_weights(iocg, iocg->active, inuse, true, now);
}
@@ -1875,7 +1939,8 @@ static void ioc_timer_fn(struct timer_list *timer)
struct ioc_gq *iocg, *tiocg;
struct ioc_now now;
LIST_HEAD(surpluses);
int nr_shortages = 0, nr_lagging = 0;
int nr_debtors = 0, nr_shortages = 0, nr_lagging = 0;
u64 usage_us_sum = 0;
u32 ppm_rthr = MILLION - ioc->params.qos[QOS_RPPM];
u32 ppm_wthr = MILLION - ioc->params.qos[QOS_WPPM];
u32 missed_ppm[2], rq_wait_pct;
@@ -1906,16 +1971,37 @@ static void ioc_timer_fn(struct timer_list *timer)
*/
list_for_each_entry_safe(iocg, tiocg, &ioc->active_iocgs, active_list) {
if (!waitqueue_active(&iocg->waitq) && !iocg->abs_vdebt &&
!iocg_is_idle(iocg))
!iocg->delay && !iocg_is_idle(iocg))
continue;
spin_lock(&iocg->waitq.lock);
if (waitqueue_active(&iocg->waitq) || iocg->abs_vdebt) {
if (waitqueue_active(&iocg->waitq) || iocg->abs_vdebt ||
iocg->delay) {
/* might be oversleeping vtime / hweight changes, kick */
iocg_kick_waitq(iocg, true, &now);
if (iocg->abs_vdebt)
nr_debtors++;
} else if (iocg_is_idle(iocg)) {
/* no waiter and idle, deactivate */
u64 vtime = atomic64_read(&iocg->vtime);
s64 excess;
/*
* @iocg has been inactive for a full duration and will
* have a high budget. Account anything above target as
* error and throw away. On reactivation, it'll start
* with the target budget.
*/
excess = now.vnow - vtime - ioc->margins.target;
if (excess > 0) {
u32 old_hwi;
current_hweight(iocg, NULL, &old_hwi);
ioc->vtime_err -= div64_u64(excess * old_hwi,
WEIGHT_ONE);
}
__propagate_weights(iocg, 0, 0, false, &now);
list_del_init(&iocg->active_list);
}
@@ -1956,11 +2042,12 @@ static void ioc_timer_fn(struct timer_list *timer)
* high-latency completions appearing as idle.
*/
usage_us = iocg->usage_delta_us;
usage_us_sum += usage_us;
if (vdone != vtime) {
u64 inflight_us = DIV64_U64_ROUND_UP(
cost_to_abs_cost(vtime - vdone, hw_inuse),
now.vrate);
ioc->vtime_base_rate);
usage_us = max(usage_us, inflight_us);
}
@@ -1980,21 +2067,25 @@ static void ioc_timer_fn(struct timer_list *timer)
if (hw_inuse < hw_active ||
(!waitqueue_active(&iocg->waitq) &&
time_before64(vtime, now.vnow - ioc->margins.low))) {
u32 hwa, hwm, new_hwi;
u32 hwa, old_hwi, hwm, new_hwi;
/*
* Already donating or accumulated enough to start.
* Determine the donation amount.
*/
current_hweight(iocg, &hwa, NULL);
current_hweight(iocg, &hwa, &old_hwi);
hwm = current_hweight_max(iocg);
new_hwi = hweight_after_donation(iocg, hwm, usage,
&now);
new_hwi = hweight_after_donation(iocg, old_hwi, hwm,
usage, &now);
if (new_hwi < hwm) {
iocg->hweight_donating = hwa;
iocg->hweight_after_donation = new_hwi;
list_add(&iocg->surplus_list, &surpluses);
} else {
TRACE_IOCG_PATH(inuse_shortage, iocg, &now,
iocg->inuse, iocg->active,
iocg->hweight_inuse, new_hwi);
__propagate_weights(iocg, iocg->active,
iocg->active, true, &now);
nr_shortages++;
@@ -2014,6 +2105,38 @@ static void ioc_timer_fn(struct timer_list *timer)
list_for_each_entry_safe(iocg, tiocg, &surpluses, surplus_list)
list_del_init(&iocg->surplus_list);
/*
* A low weight iocg can amass a large amount of debt, for example, when
* anonymous memory gets reclaimed aggressively. If the system has a lot
* of memory paired with a slow IO device, the debt can span multiple
* seconds or more. If there are no other subsequent IO issuers, the
* in-debt iocg may end up blocked paying its debt while the IO device
* is idle.
*
* The following protects against such pathological cases. If the device
* has been sufficiently idle for a substantial amount of time, the
* debts are halved. The criteria are on the conservative side as we
* want to resolve the rare extreme cases without impacting regular
* operation by forgiving debts too readily.
*/
if (nr_shortages ||
div64_u64(100 * usage_us_sum, now.now - ioc->period_at) >=
DEBT_BUSY_USAGE_PCT)
ioc->debt_busy_at = now.now;
if (nr_debtors &&
now.now - ioc->debt_busy_at >= DEBT_REDUCTION_IDLE_DUR) {
list_for_each_entry(iocg, &ioc->active_iocgs, active_list) {
if (iocg->abs_vdebt) {
spin_lock(&iocg->waitq.lock);
iocg->abs_vdebt /= 2;
iocg_kick_waitq(iocg, true, &now);
spin_unlock(&iocg->waitq.lock);
}
}
ioc->debt_busy_at = now.now;
}
/*
* If q is getting clogged or we're missing too much, we're issuing
* too much IO and should lower vtime rate. If we're not missing
@@ -2061,7 +2184,7 @@ static void ioc_timer_fn(struct timer_list *timer)
ioc->busy_level = clamp(ioc->busy_level, -1000, 1000);
if (ioc->busy_level > 0 || (ioc->busy_level < 0 && !nr_lagging)) {
u64 vrate = atomic64_read(&ioc->vtime_rate);
u64 vrate = ioc->vtime_base_rate;
u64 vrate_min = ioc->vrate_min, vrate_max = ioc->vrate_max;
/* rq_wait signal is always reliable, ignore user vrate_min */
@@ -2098,7 +2221,7 @@ static void ioc_timer_fn(struct timer_list *timer)
trace_iocost_ioc_vrate_adj(ioc, vrate, missed_ppm, rq_wait_pct,
nr_lagging, nr_shortages);
atomic64_set(&ioc->vtime_rate, vrate);
ioc->vtime_base_rate = vrate;
ioc_refresh_margins(ioc);
} else if (ioc->busy_level != prev_busy_level || nr_lagging) {
trace_iocost_ioc_vrate_adj(ioc, atomic64_read(&ioc->vtime_rate),
@@ -2119,8 +2242,11 @@ static void ioc_timer_fn(struct timer_list *timer)
ioc_start_period(ioc, &now);
} else {
ioc->busy_level = 0;
ioc->vtime_err = 0;
ioc->running = IOC_IDLE;
}
ioc_refresh_vrate(ioc, &now);
}
spin_unlock_irq(&ioc->lock);
@@ -2132,11 +2258,13 @@ static u64 adjust_inuse_and_calc_cost(struct ioc_gq *iocg, u64 vtime,
struct ioc *ioc = iocg->ioc;
struct ioc_margins *margins = &ioc->margins;
u32 adj_step = DIV_ROUND_UP(iocg->active * INUSE_ADJ_STEP_PCT, 100);
u32 __maybe_unused old_inuse = iocg->inuse, __maybe_unused old_hwi;
u32 hwi;
s64 margin;
u64 cost, new_inuse;
current_hweight(iocg, NULL, &hwi);
old_hwi = hwi;
cost = abs_cost_to_cost(abs_cost, hwi);
margin = now->vnow - vtime - cost;
@@ -2171,6 +2299,10 @@ static u64 adjust_inuse_and_calc_cost(struct ioc_gq *iocg, u64 vtime,
iocg->inuse != iocg->active);
spin_unlock_irq(&ioc->lock);
TRACE_IOCG_PATH(inuse_adjust, iocg, now,
old_inuse, iocg->inuse, old_hwi, hwi);
return cost;
}
@@ -2559,6 +2691,7 @@ static int blk_iocost_init(struct request_queue *q)
INIT_LIST_HEAD(&ioc->active_iocgs);
ioc->running = IOC_IDLE;
ioc->vtime_base_rate = VTIME_PER_USEC;
atomic64_set(&ioc->vtime_rate, VTIME_PER_USEC);
seqcount_spinlock_init(&ioc->period_seqcount, &ioc->lock);
ioc->period_at = ktime_to_us(ktime_get());
@@ -2641,8 +2774,6 @@ static void ioc_pd_init(struct blkg_policy_data *pd)
init_waitqueue_head(&iocg->waitq);
hrtimer_init(&iocg->waitq_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
iocg->waitq_timer.function = iocg_waitq_timer_fn;
hrtimer_init(&iocg->delay_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
iocg->delay_timer.function = iocg_delay_timer_fn;
iocg->level = blkg->blkcg->css.cgroup->level;
@@ -2679,7 +2810,6 @@ static void ioc_pd_free(struct blkg_policy_data *pd)
spin_unlock_irqrestore(&ioc->lock, flags);
hrtimer_cancel(&iocg->waitq_timer);
hrtimer_cancel(&iocg->delay_timer);
}
free_percpu(iocg->pcpu_stat);
kfree(iocg);
@@ -2696,7 +2826,7 @@ static size_t ioc_pd_stat(struct blkg_policy_data *pd, char *buf, size_t size)
if (iocg->level == 0) {
unsigned vp10k = DIV64_U64_ROUND_CLOSEST(
atomic64_read(&ioc->vtime_rate) * 10000,
ioc->vtime_base_rate * 10000,
VTIME_PER_USEC);
pos += scnprintf(buf + pos, size - pos, " cost.vrate=%u.%02u",
vp10k / 100, vp10k % 100);

6
include/trace/events/iocost.h
View File

@@ -95,7 +95,7 @@ DECLARE_EVENT_CLASS(iocg_inuse_update,
)
);
DEFINE_EVENT(iocg_inuse_update, iocost_inuse_takeback,
DEFINE_EVENT(iocg_inuse_update, iocost_inuse_shortage,
TP_PROTO(struct ioc_gq *iocg, const char *path, struct ioc_now *now,
u32 old_inuse, u32 new_inuse,
@@ -105,7 +105,7 @@ DEFINE_EVENT(iocg_inuse_update, iocost_inuse_takeback,
old_hw_inuse, new_hw_inuse)
);
DEFINE_EVENT(iocg_inuse_update, iocost_inuse_giveaway,
DEFINE_EVENT(iocg_inuse_update, iocost_inuse_transfer,
TP_PROTO(struct ioc_gq *iocg, const char *path, struct ioc_now *now,
u32 old_inuse, u32 new_inuse,
@@ -115,7 +115,7 @@ DEFINE_EVENT(iocg_inuse_update, iocost_inuse_giveaway,
old_hw_inuse, new_hw_inuse)
);
DEFINE_EVENT(iocg_inuse_update, iocost_inuse_reset,
DEFINE_EVENT(iocg_inuse_update, iocost_inuse_adjust,
TP_PROTO(struct ioc_gq *iocg, const char *path, struct ioc_now *now,
u32 old_inuse, u32 new_inuse,