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Unlike prof_sample which is supported only with profiling mode active, prof_threshold is intended to be an always-supported allocation callback with much less overhead. The usage of the threshold allows performance critical callers to change program execution based on the callback: e.g. drop caches when memory becomes high or to predict the program is about to OOM ahead of time using peak memory watermarks.

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This commit is contained in:
Shai Duvdevani
2025-01-29 15:25:10 -08:00
committed by Qi Wang
parent ef8e512e29
commit 257e64b968
22 changed files with 246 additions and 0 deletions
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test/unit/mallctl.c
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@@ -319,6 +319,7 @@ TEST_BEGIN(test_mallctl_opt) {
TEST_MALLCTL_OPT(bool, prof_active, prof);
TEST_MALLCTL_OPT(unsigned, prof_bt_max, prof);
TEST_MALLCTL_OPT(ssize_t, lg_prof_sample, prof);
TEST_MALLCTL_OPT(ssize_t, experimental_lg_prof_threshold, prof);
TEST_MALLCTL_OPT(bool, prof_accum, prof);
TEST_MALLCTL_OPT(bool, prof_pid_namespace, prof);
TEST_MALLCTL_OPT(ssize_t, lg_prof_interval, prof);