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Move malloc_trim invocations to background thread (#14744)

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sfan5 2024-06-17 15:59:35 +02:00 • committed by GitHub
parent d7f4ce6cff
commit fac9aac821
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4 changed files with 30 additions and 11 deletions
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13
src/porting.cpp
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@ -920,22 +920,29 @@ double perf_freq = get_perf_freq();
*
* As a workaround we track freed memory coarsely and call malloc_trim() once a
* certain amount is reached.
*
* Because trimming can take more than 10ms and would cause jitter if done
* uncontrolled we have a separate function, which is called from background threads.
*/
static std::atomic<size_t> memory_freed;
constexpr size_t MEMORY_TRIM_THRESHOLD = 128 * 1024 * 1024;
constexpr size_t MEMORY_TRIM_THRESHOLD = 256 * 1024 * 1024;
void TrackFreedMemory(size_t amount)
{
memory_freed.fetch_add(amount, std::memory_order_relaxed);
}
void TriggerMemoryTrim()
{
constexpr auto MO = std::memory_order_relaxed;
memory_freed.fetch_add(amount, MO);
if (memory_freed.load(MO) >= MEMORY_TRIM_THRESHOLD) {
// Synchronize call
if (memory_freed.exchange(0, MO) < MEMORY_TRIM_THRESHOLD)
return;
// Leave some headroom for future allocations
malloc_trim(1 * 1024 * 1024);
malloc_trim(8 * 1024 * 1024);
}
}