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Basic: Use getrusage() to read memory usage #85452

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Nov 12, 2025
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Basic: Use getrusage() to read memory usage #85452

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28 changes: 8 additions & 20 deletions lib/Basic/Statistic.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -39,9 +39,6 @@
#ifdef HAVE_PROC_PID_RUSAGE
#include <libproc.h>
#endif
#ifdef HAVE_MALLOC_MALLOC_H
#include <malloc/malloc.h>
#endif
#if defined(_WIN32)
#define NOMINMAX
#include "Windows.h"
Expand Down Expand Up @@ -536,25 +533,16 @@ FrontendStatsTracer::~FrontendStatsTracer()
// associated fields in the provided AlwaysOnFrontendCounters.
void updateProcessWideFrontendCounters(
UnifiedStatsReporter::AlwaysOnFrontendCounters &C) {
if (auto instrExecuted = getInstructionsExecuted()) {
C.NumInstructionsExecuted = instrExecuted;
#if defined(HAVE_PROC_PID_RUSAGE) && defined(RUSAGE_INFO_V4)
struct rusage_info_v4 ru;
if (proc_pid_rusage(getpid(), RUSAGE_INFO_V4, (rusage_info_t *)&ru) == 0) {
C.NumInstructionsExecuted = ru.ri_instructions;
C.MaxMallocUsage = ru.ri_lifetime_max_phys_footprint;
return;
}

#if defined(HAVE_MALLOC_ZONE_STATISTICS) && defined(HAVE_MALLOC_MALLOC_H)
// On Darwin we have a lifetime max that's maintained by malloc we can
// just directly query, even if we only make one query on shutdown.
malloc_statistics_t Stats;
// Query all zones.
malloc_zone_statistics(/*zone=*/NULL, &Stats);
C.MaxMallocUsage = (int64_t)Stats.max_size_in_use;
#else
// If we don't have a malloc-tracked max-usage counter, we have to rely
// on taking the max over current-usage samples while running and hoping
// we get called often enough. This will happen when profiling/tracing,
// but not while doing single-query-on-shutdown collection.
C.MaxMallocUsage = std::max(C.MaxMallocUsage,
(int64_t)llvm::sys::Process::GetMallocUsage());
#endif

// FIXME: Do something useful when the above API is not available.
}

static inline void
Expand Down