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Add JEMALLOC_COLD, and mark some functions cold.

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This hints to the compiler that it should care more about space than CPU (among
other things).  In cases where the compiler lacks profile-guided information,
this can be a substantial space savings.

For now, we mark the mallctl or atexit driven profiling and stats functions that
take up the most space.
This commit is contained in:
David Goldblatt
2020-12-17 12:04:07 -08:00
committed by David Goldblatt
parent 5d8e70ab26
commit a9fa2defdb
7 changed files with 36 additions and 1 deletions
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7
src/prof_log.c
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@@ -200,6 +200,7 @@ prof_log_thr_index(tsd_t *tsd, uint64_t thr_uid, const char *name) {
}
}
JEMALLOC_COLD
void
prof_try_log(tsd_t *tsd, size_t usize, prof_info_t *prof_info) {
cassert(config_prof);
@@ -411,6 +412,7 @@ prof_log_dummy_set(bool new_value) {
prof_log_dummy = new_value;
}
JEMALLOC_COLD
bool
prof_log_start(tsdn_t *tsdn, const char *filename) {
cassert(config_prof);
@@ -593,6 +595,7 @@ prof_log_emit_metadata(emitter_t *emitter) {
}
#define PROF_LOG_STOP_BUFSIZE PROF_DUMP_BUFSIZE
JEMALLOC_COLD
bool
prof_log_stop(tsdn_t *tsdn) {
cassert(config_prof);
@@ -681,7 +684,9 @@ prof_log_stop(tsdn_t *tsdn) {
}
#undef PROF_LOG_STOP_BUFSIZE
bool prof_log_init(tsd_t *tsd) {
JEMALLOC_COLD
bool
prof_log_init(tsd_t *tsd) {
cassert(config_prof);
if (malloc_mutex_init(&log_mtx, "prof_log",
WITNESS_RANK_PROF_LOG, malloc_mutex_rank_exclusive)) {