From 19fcec84d8d7d21e796c7624e521b60d28ee21ed Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:45:59 +0200
Subject: Adding upstream version 16.2.11+ds.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/rgw/rgw_dmclock_scheduler_ctx.h | 122 ++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 src/rgw/rgw_dmclock_scheduler_ctx.h

(limited to 'src/rgw/rgw_dmclock_scheduler_ctx.h')

diff --git a/src/rgw/rgw_dmclock_scheduler_ctx.h b/src/rgw/rgw_dmclock_scheduler_ctx.h
new file mode 100644
index 000000000..be3b2cc27
--- /dev/null
+++ b/src/rgw/rgw_dmclock_scheduler_ctx.h
@@ -0,0 +1,122 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab ft=cpp
+
+#ifndef RGW_DMCLOCK_SCHEDULER_CTX_H
+#define RGW_DMCLOCK_SCHEDULER_CTX_H
+
+#include "common/perf_counters.h"
+#include "common/ceph_context.h"
+#include "common/config.h"
+#include "rgw_dmclock.h"
+
+namespace queue_counters {
+
+  enum {
+        l_first = 427150,
+        l_qlen,
+        l_cost,
+        l_res,
+        l_res_cost,
+        l_prio,
+        l_prio_cost,
+        l_limit,
+        l_limit_cost,
+        l_cancel,
+        l_cancel_cost,
+        l_res_latency,
+        l_prio_latency,
+        l_last,
+  };
+
+  PerfCountersRef build(CephContext *cct, const std::string& name);
+
+} // namespace queue_counters
+
+namespace throttle_counters {
+  enum {
+        l_first = 437219,
+        l_throttle,
+        l_outstanding,
+        l_last
+  };
+
+  PerfCountersRef build(CephContext *cct, const std::string& name);
+} // namespace throttle
+
+namespace rgw::dmclock {
+
+// the last client counter would be for global scheduler stats
+static constexpr auto counter_size = static_cast<size_t>(client_id::count) + 1;
+/// array of per-client counters to serve as GetClientCounters
+class ClientCounters {
+  std::array<PerfCountersRef, counter_size> clients;
+ public:
+  ClientCounters(CephContext *cct);
+
+  PerfCounters* operator()(client_id client) const {
+    return clients[static_cast<size_t>(client)].get();
+  }
+};
+
+class ThrottleCounters {
+  PerfCountersRef counters;
+public:
+  ThrottleCounters(CephContext* const cct,const std::string& name):
+    counters(throttle_counters::build(cct, name)) {}
+
+  PerfCounters* operator()() const {
+    return counters.get();
+  }
+};
+
+
+struct ClientSum {
+  uint64_t count{0};
+  Cost cost{0};
+};
+
+constexpr auto client_count = static_cast<size_t>(client_id::count);
+using ClientSums = std::array<ClientSum, client_count>;
+
+void inc(ClientSums& sums, client_id client, Cost cost);
+void on_cancel(PerfCounters *c, const ClientSum& sum);
+void on_process(PerfCounters* c, const ClientSum& rsum, const ClientSum& psum);
+
+
+class ClientConfig : public md_config_obs_t {
+  std::vector<ClientInfo> clients;
+
+  void update(const ConfigProxy &conf);
+
+public:
+  ClientConfig(CephContext *cct);
+
+  ClientInfo* operator()(client_id client);
+
+  const char** get_tracked_conf_keys() const override;
+  void handle_conf_change(const ConfigProxy& conf,
+                          const std::set<std::string>& changed) override;
+};
+
+class SchedulerCtx {
+public:
+  SchedulerCtx(CephContext* const cct) : sched_t(get_scheduler_t(cct))
+  {
+    if(sched_t == scheduler_t::dmclock) {
+      dmc_client_config = std::make_shared<ClientConfig>(cct);
+      // we don't have a move only cref std::function yet
+      dmc_client_counters = std::make_optional<ClientCounters>(cct);
+    }
+  }
+  // We need to construct a std::function from a NonCopyable object
+  ClientCounters& get_dmc_client_counters() { return dmc_client_counters.value(); }
+  ClientConfig* const get_dmc_client_config() const { return dmc_client_config.get(); }
+private:
+  scheduler_t sched_t;
+  std::shared_ptr<ClientConfig> dmc_client_config {nullptr};
+  std::optional<ClientCounters> dmc_client_counters  {std::nullopt};
+};
+
+} // namespace rgw::dmclock
+
+#endif /* RGW_DMCLOCK_SCHEDULER_CTX_H */
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