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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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4
src/jemalloc.c
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@@ -1619,6 +1619,10 @@ malloc_conf_init_helper(sc_data_t *sc_data, unsigned bin_shard_sizes[SC_NBINS],
"lg_prof_sample", 0, (sizeof(uint64_t) << 3)
- 1, CONF_DONT_CHECK_MIN, CONF_CHECK_MAX,
true)
CONF_HANDLE_SIZE_T(opt_experimental_lg_prof_threshold,
"experimental_lg_prof_threshold", 0, (sizeof(uint64_t) << 3)
- 1, CONF_DONT_CHECK_MIN, CONF_CHECK_MAX,
true)
CONF_HANDLE_BOOL(opt_prof_accum, "prof_accum")
CONF_HANDLE_UNSIGNED(opt_prof_bt_max, "prof_bt_max",
1, PROF_BT_MAX_LIMIT, CONF_CHECK_MIN, CONF_CHECK_MAX,