Grcov report - utils.cc

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#include "source/common/memory/utils.h"

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#include "source/common/common/assert.h"

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#include "source/common/memory/stats.h"

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#if defined(TCMALLOC)

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#include "tcmalloc/malloc_extension.h"

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#elif defined(GPERFTOOLS_TCMALLOC)

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#include "gperftools/malloc_extension.h"

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#endif

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namespace Envoy {

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namespace Memory {

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void Utils::releaseFreeMemory() {

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#if defined(TCMALLOC)

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  tcmalloc::MallocExtension::ReleaseMemoryToSystem(maxUnfreedMemoryBytes());

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#elif defined(GPERFTOOLS_TCMALLOC)

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  MallocExtension::instance()->ReleaseFreeMemory();

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#endif

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/*

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  The purpose of this function is to release the cache introduced by tcmalloc,

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  mainly in xDS config updates, admin handler, and so on. all work on the main thread,

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  so the overall impact on performance is small.

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  Ref: https://github.com/envoyproxy/envoy/pull/9471#discussion_r363825985

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*/

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6064

void Utils::tryShrinkHeap() {

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#if defined(TCMALLOC) || defined(GPERFTOOLS_TCMALLOC)

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  auto total_physical_bytes = Stats::totalPhysicalBytes();

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  auto allocated_size_by_app = Stats::totalCurrentlyAllocated();

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  const uint64_t threshold = maxUnfreedMemoryBytes();

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  if (total_physical_bytes >= allocated_size_by_app &&

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      (total_physical_bytes - allocated_size_by_app) >= threshold) {

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    Utils::releaseFreeMemory();

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#endif

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} // namespace Memory

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} // namespace Envoy