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Allow setting custom backtrace hook

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Existing backtrace implementations skip native stack frames from runtimes like
Python. The hook allows to augment the backtraces to attribute allocations to
native functions in heap profiles.
This commit is contained in:
Alex Lapenkou
2021-08-30 14:05:56 -07:00
committed by Alexander Lapenkov
parent 523cfa55c5
commit f7d46b8119
11 changed files with 172 additions and 30 deletions
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36
src/ctl.c
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@@ -305,6 +305,7 @@ CTL_PROTO(stats_retained)
CTL_PROTO(stats_zero_reallocs)
CTL_PROTO(experimental_hooks_install)
CTL_PROTO(experimental_hooks_remove)
CTL_PROTO(experimental_hooks_prof_backtrace)
CTL_PROTO(experimental_thread_activity_callback)
CTL_PROTO(experimental_utilization_query)
CTL_PROTO(experimental_utilization_batch_query)
@@ -833,7 +834,8 @@ static const ctl_named_node_t stats_node[] = {
static const ctl_named_node_t experimental_hooks_node[] = {
{NAME("install"), CTL(experimental_hooks_install)},
{NAME("remove"), CTL(experimental_hooks_remove)}
{NAME("remove"), CTL(experimental_hooks_remove)},
{NAME("prof_backtrace"), CTL(experimental_hooks_prof_backtrace)}
};
static const ctl_named_node_t experimental_thread_node[] = {
@@ -3328,6 +3330,38 @@ prof_log_stop_ctl(tsd_t *tsd, const size_t *mib, size_t miblen, void *oldp,
return 0;
}
static int
experimental_hooks_prof_backtrace_ctl(tsd_t *tsd, const size_t *mib,
size_t miblen, void *oldp, size_t *oldlenp, void *newp, size_t newlen) {
int ret;
if (oldp == NULL && newp == NULL) {
ret = EINVAL;
goto label_return;
}
if (oldp != NULL) {
prof_backtrace_hook_t old_hook =
prof_backtrace_hook_get();
READ(old_hook, prof_backtrace_hook_t);
}
if (newp != NULL) {
if (!opt_prof) {
ret = ENOENT;
goto label_return;
}
prof_backtrace_hook_t new_hook JEMALLOC_CC_SILENCE_INIT(NULL);
WRITE(new_hook, prof_backtrace_hook_t);
if (new_hook == NULL) {
ret = EINVAL;
goto label_return;
}
prof_backtrace_hook_set(new_hook);
}
ret = 0;
label_return:
return ret;
}
/******************************************************************************/
CTL_RO_CGEN(config_stats, stats_allocated, ctl_stats->allocated, size_t)