diff options
Diffstat (limited to 'absl/container/internal/hashtablez_sampler.cc')
-rw-r--r-- | absl/container/internal/hashtablez_sampler.cc | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/absl/container/internal/hashtablez_sampler.cc b/absl/container/internal/hashtablez_sampler.cc index d03dd82e7fd5..054e89817815 100644 --- a/absl/container/internal/hashtablez_sampler.cc +++ b/absl/container/internal/hashtablez_sampler.cc @@ -228,8 +228,26 @@ int64_t HashtablezSampler::Iterate( return dropped_samples_.load(std::memory_order_relaxed); } +static bool ShouldForceSampling() { + enum ForceState { + kDontForce, + kForce, + kUninitialized + }; + ABSL_CONST_INIT static std::atomic<ForceState> global_state{ + kUninitialized}; + ForceState state = global_state.load(std::memory_order_relaxed); + if (ABSL_PREDICT_TRUE(state == kDontForce)) return false; + + if (state == kUninitialized) { + state = AbslContainerInternalSampleEverything() ? kForce : kDontForce; + global_state.store(state, std::memory_order_relaxed); + } + return state == kForce; +} + HashtablezInfo* SampleSlow(int64_t* next_sample) { - if (kAbslContainerInternalSampleEverything) { + if (ABSL_PREDICT_FALSE(ShouldForceSampling())) { *next_sample = 1; return HashtablezSampler::Global().Register(); } |