102 lines
2.8 KiB
C++
102 lines
2.8 KiB
C++
//===-- stats.h -------------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef SCUDO_STATS_H_
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#define SCUDO_STATS_H_
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#include "atomic_helpers.h"
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#include "list.h"
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#include "mutex.h"
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#include <string.h>
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namespace scudo {
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// Memory allocator statistics
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enum StatType { StatAllocated, StatFree, StatMapped, StatCount };
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typedef uptr StatCounters[StatCount];
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// Per-thread stats, live in per-thread cache. We use atomics so that the
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// numbers themselves are consistent. But we don't use atomic_{add|sub} or a
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// lock, because those are expensive operations , and we only care for the stats
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// to be "somewhat" correct: eg. if we call GlobalStats::get while a thread is
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// LocalStats::add'ing, this is OK, we will still get a meaningful number.
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class LocalStats {
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public:
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void init() {
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for (uptr I = 0; I < StatCount; I++)
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DCHECK_EQ(get(static_cast<StatType>(I)), 0U);
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}
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void add(StatType I, uptr V) {
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V += atomic_load_relaxed(&StatsArray[I]);
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atomic_store_relaxed(&StatsArray[I], V);
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}
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void sub(StatType I, uptr V) {
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V = atomic_load_relaxed(&StatsArray[I]) - V;
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atomic_store_relaxed(&StatsArray[I], V);
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}
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void set(StatType I, uptr V) { atomic_store_relaxed(&StatsArray[I], V); }
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uptr get(StatType I) const { return atomic_load_relaxed(&StatsArray[I]); }
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LocalStats *Next = nullptr;
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LocalStats *Prev = nullptr;
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private:
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atomic_uptr StatsArray[StatCount] = {};
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};
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// Global stats, used for aggregation and querying.
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class GlobalStats : public LocalStats {
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public:
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void init() { LocalStats::init(); }
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void link(LocalStats *S) {
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ScopedLock L(Mutex);
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StatsList.push_back(S);
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}
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void unlink(LocalStats *S) {
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ScopedLock L(Mutex);
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StatsList.remove(S);
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for (uptr I = 0; I < StatCount; I++)
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add(static_cast<StatType>(I), S->get(static_cast<StatType>(I)));
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}
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void get(uptr *S) const {
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ScopedLock L(Mutex);
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for (uptr I = 0; I < StatCount; I++)
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S[I] = LocalStats::get(static_cast<StatType>(I));
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for (const auto &Stats : StatsList) {
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for (uptr I = 0; I < StatCount; I++)
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S[I] += Stats.get(static_cast<StatType>(I));
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}
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// All stats must be non-negative.
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for (uptr I = 0; I < StatCount; I++)
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S[I] = static_cast<sptr>(S[I]) >= 0 ? S[I] : 0;
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}
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void lock() { Mutex.lock(); }
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void unlock() { Mutex.unlock(); }
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void disable() { lock(); }
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void enable() { unlock(); }
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private:
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mutable HybridMutex Mutex;
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DoublyLinkedList<LocalStats> StatsList;
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};
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} // namespace scudo
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#endif // SCUDO_STATS_H_
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