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Fix off-by-one in stacktrace filter probability when pool is empty. #293

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copybara-service merged 2 commits into from
Apr 30, 2026
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Fix off-by-one in stacktrace filter probability when pool is empty. #293

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be6d592
Fix off-by-one in stacktrace filter probability when pool is empty.
cuiweixie Mar 18, 2026
0bdf87a
fix: review
cuiweixie Mar 18, 2026
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2 changes: 1 addition & 1 deletion tcmalloc/guarded_page_allocator.cc
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Expand Up @@ -146,7 +146,7 @@ GuardedAllocWithStatus GuardedPageAllocator::TrySample(
// proportional to pool utilization, with pool utilization of 50% or more
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// resulting in always filtering currently covered allocations.
const size_t usage_pct = (allocated_pages() * 100) / max_allocated_pages_;
if (rand_.Next() % 50 <= usage_pct) {
if (rand_.Next() % 50 < usage_pct) {
// Decay even if the current allocation is filtered, so that we keep
// sampling even if we only see the same allocations over and over.
stacktrace_filter_.Decay();
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