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#include "common/Throttle.h"
#include "common/debug.h"
#include "common/ceph_context.h"
#include "common/perf_counters.h"
#define dout_subsys ceph_subsys_throttle
#undef dout_prefix
#define dout_prefix *_dout << "throttle(" << name << " " << (void*)this << ") "
enum {
l_throttle_first = 532430,
l_throttle_val,
l_throttle_max,
l_throttle_get,
l_throttle_get_sum,
l_throttle_get_or_fail_fail,
l_throttle_get_or_fail_success,
l_throttle_take,
l_throttle_take_sum,
l_throttle_put,
l_throttle_put_sum,
l_throttle_wait,
l_throttle_last,
};
Throttle::Throttle(CephContext *cct, std::string n, int64_t m)
: cct(cct), name(n),
max(m),
lock("Throttle::lock")
{
assert(m >= 0);
PerfCountersBuilder b(cct, string("throttle-") + name, l_throttle_first, l_throttle_last);
b.add_u64_counter(l_throttle_val, "val");
b.add_u64_counter(l_throttle_max, "max");
b.add_u64_counter(l_throttle_get, "get");
b.add_u64_counter(l_throttle_get_sum, "get_sum");
b.add_u64_counter(l_throttle_get_or_fail_fail, "get_or_fail_fail");
b.add_u64_counter(l_throttle_get_or_fail_success, "get_or_fail_success");
b.add_u64_counter(l_throttle_take, "take");
b.add_u64_counter(l_throttle_take_sum, "take_sum");
b.add_u64_counter(l_throttle_put, "put");
b.add_u64_counter(l_throttle_put_sum, "put_sum");
b.add_time_avg(l_throttle_wait, "wait");
logger = b.create_perf_counters();
cct->get_perfcounters_collection()->add(logger);
logger->set(l_throttle_max, max.read());
}
Throttle::~Throttle()
{
while (!cond.empty()) {
Cond *cv = cond.front();
delete cv;
cond.pop_front();
}
cct->get_perfcounters_collection()->remove(logger);
delete logger;
}
void Throttle::_reset_max(int64_t m)
{
assert(lock.is_locked());
if (m < ((int64_t)max.read()) && !cond.empty())
cond.front()->SignalOne();
logger->set(l_throttle_max, m);
max.set((size_t)m);
}
bool Throttle::_wait(int64_t c)
{
utime_t start;
bool waited = false;
if (_should_wait(c) || !cond.empty()) { // always wait behind other waiters.
Cond *cv = new Cond;
cond.push_back(cv);
do {
if (!waited) {
ldout(cct, 2) << "_wait waiting..." << dendl;
start = ceph_clock_now(cct);
}
waited = true;
cv->Wait(lock);
} while (_should_wait(c) || cv != cond.front());
if (waited) {
ldout(cct, 3) << "_wait finished waiting" << dendl;
utime_t dur = ceph_clock_now(cct) - start;
logger->tinc(l_throttle_wait, dur);
}
delete cv;
cond.pop_front();
// wake up the next guy
if (!cond.empty())
cond.front()->SignalOne();
}
return waited;
}
bool Throttle::wait(int64_t m)
{
Mutex::Locker l(lock);
if (m) {
assert(m > 0);
_reset_max(m);
}
ldout(cct, 10) << "wait" << dendl;
return _wait(0);
}
int64_t Throttle::take(int64_t c)
{
assert(c >= 0);
ldout(cct, 10) << "take " << c << dendl;
{
Mutex::Locker l(lock);
count.add(c);
}
logger->inc(l_throttle_take);
logger->inc(l_throttle_take_sum, c);
logger->set(l_throttle_val, count.read());
return count.read();
}
bool Throttle::get(int64_t c, int64_t m)
{
assert(c >= 0);
ldout(cct, 10) << "get " << c << " (" << count.read() << " -> " << (count.read() + c) << ")" << dendl;
bool waited = false;
{
Mutex::Locker l(lock);
if (m) {
assert(m > 0);
_reset_max(m);
}
waited = _wait(c);
count.add(c);
}
logger->inc(l_throttle_get);
logger->inc(l_throttle_get_sum, c);
logger->set(l_throttle_val, count.read());
return waited;
}
/* Returns true if it successfully got the requested amount,
* or false if it would block.
*/
bool Throttle::get_or_fail(int64_t c)
{
assert (c >= 0);
Mutex::Locker l(lock);
if (_should_wait(c) || !cond.empty()) {
ldout(cct, 10) << "get_or_fail " << c << " failed" << dendl;
logger->inc(l_throttle_get_or_fail_fail);
return false;
} else {
ldout(cct, 10) << "get_or_fail " << c << " success (" << count.read() << " -> " << (count.read() + c) << ")" << dendl;
count.add(c);
logger->inc(l_throttle_get_or_fail_success);
logger->inc(l_throttle_get);
logger->inc(l_throttle_get_sum, c);
logger->set(l_throttle_val, count.read());
return true;
}
}
int64_t Throttle::put(int64_t c)
{
assert(c >= 0);
ldout(cct, 10) << "put " << c << " (" << count.read() << " -> " << (count.read()-c) << ")" << dendl;
Mutex::Locker l(lock);
if (c) {
if (!cond.empty())
cond.front()->SignalOne();
assert(((int64_t)count.read()) >= c); //if count goes negative, we failed somewhere!
count.sub(c);
logger->inc(l_throttle_put);
logger->inc(l_throttle_put_sum, c);
logger->set(l_throttle_val, count.read());
}
return count.read();
}
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