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tcmalloc: fragmentation overhead instrumentation

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This patch adds visibility into the overhead due to fragmentation for each size
class in the tcmalloc central free list, which is helpful when debugging
fragmentation issues.
This commit is contained in:
Jon Kohler 2020-02-18 11:14:49 -05:00 committed by Aliaksey Kandratsenka
parent 36bf1309de
commit 1bfcb5bc3a
1 changed files with 12 additions and 5 deletions
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17
src/tcmalloc.cc
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@ -468,18 +468,25 @@ static void DumpStats(TCMalloc_Printer* out, int level) {
out->printf("Total size of freelists for per-thread caches,\n"); out->printf("Total size of freelists for per-thread caches,\n");
out->printf("transfer cache, and central cache, by size class\n"); out->printf("transfer cache, and central cache, by size class\n");
out->printf("------------------------------------------------\n"); out->printf("------------------------------------------------\n");
uint64_t cumulative = 0; uint64_t cumulative_bytes = 0;
uint64_t cumulative_overhead = 0;
for (uint32 cl = 0; cl < Static::num_size_classes(); ++cl) { for (uint32 cl = 0; cl < Static::num_size_classes(); ++cl) {
if (class_count[cl] > 0) { if (class_count[cl] > 0) {
size_t cl_size = Static::sizemap()->ByteSizeForClass(cl); size_t cl_size = Static::sizemap()->ByteSizeForClass(cl);
uint64_t class_bytes = class_count[cl] * cl_size; const uint64_t class_bytes = class_count[cl] * cl_size;
cumulative += class_bytes; cumulative_bytes += class_bytes;
const uint64_t class_overhead =
Static::central_cache()[cl].OverheadBytes();
cumulative_overhead += class_overhead;
out->printf("class %3d [ %8" PRIuS " bytes ] : " out->printf("class %3d [ %8" PRIuS " bytes ] : "
"%8" PRIu64 " objs; %5.1f MiB; %5.1f cum MiB\n", "%8" PRIu64 " objs; %5.1f MiB; %5.1f cum MiB; "
"%8.3f overhead MiB; %8.3f cum overhead MiB\n",
cl, cl_size, cl, cl_size,
class_count[cl], class_count[cl],
class_bytes / MiB, class_bytes / MiB,
cumulative / MiB); cumulative_bytes / MiB,
class_overhead / MiB,
cumulative_overhead / MiB);
} }
} }