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PoC: USDT static tracepoints for wait event tracing #18

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PoC: USDT static tracepoints for wait event tracing #18

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3 changes: 3 additions & 0 deletions src/backend/utils/probes.d
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Original file line number Diff line number Diff line change
Expand Up @@ -91,4 +91,7 @@ provider postgresql {
probe wal__switch();
probe wal__buffer__write__dirty__start();
probe wal__buffer__write__dirty__done();

probe wait__event__start(unsigned int);
probe wait__event__end();
};
5 changes: 5 additions & 0 deletions src/include/utils/wait_event.h
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Expand Up @@ -12,6 +12,7 @@

/* enums for wait events */
#include "utils/wait_event_types.h"
#include "utils/probes.h"

extern const char *pgstat_get_wait_event(uint32 wait_event_info);
extern const char *pgstat_get_wait_event_type(uint32 wait_event_info);
Expand Down Expand Up @@ -73,6 +74,8 @@ pgstat_report_wait_start(uint32 wait_event_info)
* four-bytes, updates are atomic.
*/
*(volatile uint32 *) my_wait_event_info = wait_event_info;

TRACE_POSTGRESQL_WAIT_EVENT_START(wait_event_info);
}

/* ----------
Expand All @@ -86,6 +89,8 @@ pgstat_report_wait_end(void)
{
/* see pgstat_report_wait_start() */
*(volatile uint32 *) my_wait_event_info = 0;

TRACE_POSTGRESQL_WAIT_EVENT_END();
}


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