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Split backend status and progress related functionality out of pgstat.c.

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Backend status (supporting pg_stat_activity) and command
progress (supporting pg_stat_progress*) related code is largely
independent from the rest of pgstat.[ch] (supporting views like
pg_stat_all_tables that accumulate data over time). See also
a333476b92.

This commit doesn't rename the function names to make the distinction
from the rest of pgstat_ clearer - that'd be more invasive and not
clearly beneficial. If we were to decide to do such a rename at some
point, it's better done separately from moving the code as well.

Robert's review was of an earlier version.

Reviewed-By: Robert Haas <robertmhaas@gmail.com>
Discussion: https://postgr.es/m/20210316195440.twxmlov24rr2nxrg@alap3.anarazel.de
This commit is contained in:
Andres Freund
2021-04-03 11:42:52 -07:00
parent 8d3a4c3eae
commit e1025044cd
11 changed files with 1598 additions and 1392 deletions
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112
src/backend/utils/activity/backend_progress.c Normal file
View File

@@ -0,0 +1,112 @@
/* ----------
* progress.c
*
* Command progress reporting infrastructure.
*
* Copyright (c) 2001-2021, PostgreSQL Global Development Group
*
* src/backend/postmaster/progress.c
* ----------
*/
#include "postgres.h"
#include "port/atomics.h" /* for memory barriers */
#include "utils/backend_progress.h"
#include "utils/backend_status.h"
/*-----------
* pgstat_progress_start_command() -
*
* Set st_progress_command (and st_progress_command_target) in own backend
* entry. Also, zero-initialize st_progress_param array.
*-----------
*/
void
pgstat_progress_start_command(ProgressCommandType cmdtype, Oid relid)
{
volatile PgBackendStatus *beentry = MyBEEntry;
if (!beentry || !pgstat_track_activities)
return;
PGSTAT_BEGIN_WRITE_ACTIVITY(beentry);
beentry->st_progress_command = cmdtype;
beentry->st_progress_command_target = relid;
MemSet(&beentry->st_progress_param, 0, sizeof(beentry->st_progress_param));
PGSTAT_END_WRITE_ACTIVITY(beentry);
}
/*-----------
* pgstat_progress_update_param() -
*
* Update index'th member in st_progress_param[] of own backend entry.
*-----------
*/
void
pgstat_progress_update_param(int index, int64 val)
{
volatile PgBackendStatus *beentry = MyBEEntry;
Assert(index >= 0 && index < PGSTAT_NUM_PROGRESS_PARAM);
if (!beentry || !pgstat_track_activities)
return;
PGSTAT_BEGIN_WRITE_ACTIVITY(beentry);
beentry->st_progress_param[index] = val;
PGSTAT_END_WRITE_ACTIVITY(beentry);
}
/*-----------
* pgstat_progress_update_multi_param() -
*
* Update multiple members in st_progress_param[] of own backend entry.
* This is atomic; readers won't see intermediate states.
*-----------
*/
void
pgstat_progress_update_multi_param(int nparam, const int *index,
const int64 *val)
{
volatile PgBackendStatus *beentry = MyBEEntry;
int i;
if (!beentry || !pgstat_track_activities || nparam == 0)
return;
PGSTAT_BEGIN_WRITE_ACTIVITY(beentry);
for (i = 0; i < nparam; ++i)
{
Assert(index[i] >= 0 && index[i] < PGSTAT_NUM_PROGRESS_PARAM);
beentry->st_progress_param[index[i]] = val[i];
}
PGSTAT_END_WRITE_ACTIVITY(beentry);
}
/*-----------
* pgstat_progress_end_command() -
*
* Reset st_progress_command (and st_progress_command_target) in own backend
* entry. This signals the end of the command.
*-----------
*/
void
pgstat_progress_end_command(void)
{
volatile PgBackendStatus *beentry = MyBEEntry;
if (!beentry || !pgstat_track_activities)
return;
if (beentry->st_progress_command == PROGRESS_COMMAND_INVALID)
return;
PGSTAT_BEGIN_WRITE_ACTIVITY(beentry);
beentry->st_progress_command = PROGRESS_COMMAND_INVALID;
beentry->st_progress_command_target = InvalidOid;
PGSTAT_END_WRITE_ACTIVITY(beentry);
}