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#include "common/async/completion.h"
#include "rgw_dmclock_async_scheduler.h"
#include "rgw_dmclock_scheduler.h"
namespace rgw::dmclock {
AsyncScheduler::~AsyncScheduler()
{
cancel();
if (observer) {
cct->_conf.remove_observer(this);
}
}
const char** AsyncScheduler::get_tracked_conf_keys() const
{
if (observer) {
return observer->get_tracked_conf_keys();
}
static const char* keys[] = { "rgw_max_concurrent_requests", nullptr };
return keys;
}
void AsyncScheduler::handle_conf_change(const ConfigProxy& conf,
const std::set<std::string>& changed)
{
if (observer) {
observer->handle_conf_change(conf, changed);
}
if (changed.count("rgw_max_concurrent_requests")) {
auto new_max = conf.get_val<int64_t>("rgw_max_concurrent_requests");
max_requests = new_max > 0 ? new_max : std::numeric_limits<int64_t>::max();
}
queue.update_client_infos();
schedule(crimson::dmclock::TimeZero);
}
int AsyncScheduler::schedule_request_impl(const client_id& client,
const ReqParams& params,
const Time& time, const Cost& cost,
optional_yield yield_ctx)
{
ceph_assert(yield_ctx);
auto &yield = yield_ctx.get_yield_context();
boost::system::error_code ec;
async_request(client, params, time, cost, yield[ec]);
if (ec){
if (ec == boost::system::errc::resource_unavailable_try_again)
return -EAGAIN;
else
return -ec.value();
}
return 0;
}
void AsyncScheduler::request_complete()
{
--outstanding_requests;
schedule(crimson::dmclock::TimeZero);
}
void AsyncScheduler::cancel()
{
ClientSums sums;
queue.remove_by_req_filter([&] (RequestRef&& request) {
inc(sums, request->client, request->cost);
auto c = static_cast<Completion*>(request.release());
Completion::dispatch(std::unique_ptr<Completion>{c},
boost::asio::error::operation_aborted,
PhaseType::priority);
return true;
});
timer.cancel();
for (size_t i = 0; i < client_count; i++) {
if (auto c = counters(static_cast<client_id>(i))) {
on_cancel(c, sums[i]);
}
}
}
void AsyncScheduler::cancel(const client_id& client)
{
ClientSum sum;
queue.remove_by_client(client, false, [&] (RequestRef&& request) {
sum.count++;
sum.cost += request->cost;
auto c = static_cast<Completion*>(request.release());
Completion::dispatch(std::unique_ptr<Completion>{c},
boost::asio::error::operation_aborted,
PhaseType::priority);
});
if (auto c = counters(client)) {
on_cancel(c, sum);
}
schedule(crimson::dmclock::TimeZero);
}
void AsyncScheduler::schedule(const Time& time)
{
timer.expires_at(Clock::from_double(time));
timer.async_wait([this] (boost::system::error_code ec) {
// process requests unless the wait was canceled. note that a canceled
// wait may execute after this AsyncScheduler destructs
if (ec != boost::asio::error::operation_aborted) {
process(get_time());
}
});
}
void AsyncScheduler::process(const Time& now)
{
// must run in the executor. we should only invoke completion handlers if the
// executor is running
assert(get_executor().running_in_this_thread());
ClientSums rsums, psums;
while (outstanding_requests < max_requests) {
auto pull = queue.pull_request(now);
if (pull.is_none()) {
// no pending requests, cancel the timer
timer.cancel();
break;
}
if (pull.is_future()) {
// update the timer based on the future time
schedule(pull.getTime());
break;
}
++outstanding_requests;
// complete the request
auto& r = pull.get_retn();
auto client = r.client;
auto phase = r.phase;
auto started = r.request->started;
auto cost = r.request->cost;
auto c = static_cast<Completion*>(r.request.release());
Completion::post(std::unique_ptr<Completion>{c},
boost::system::error_code{}, phase);
if (auto c = counters(client)) {
auto lat = Clock::from_double(now) - Clock::from_double(started);
if (phase == PhaseType::reservation) {
inc(rsums, client, cost);
c->tinc(queue_counters::l_res_latency, lat);
} else {
inc(psums, client, cost);
c->tinc(queue_counters::l_prio_latency, lat);
}
}
}
if (outstanding_requests >= max_requests) {
if(auto c = counters(client_id::count)){
c->inc(throttle_counters::l_throttle);
}
}
for (size_t i = 0; i < client_count; i++) {
if (auto c = counters(static_cast<client_id>(i))) {
on_process(c, rsums[i], psums[i]);
}
}
}
} // namespace rgw::dmclock
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