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Add some checkpoint/restartpoint status to ps display 

This is done for end-of-recovery and shutdown checkpoints/restartpoints
(end-of-recovery restartpoints don't exist) rather than all types of
checkpoints, in cases where it may not be possible to rely on
pg_stat_activity to get a status from the startup or checkpointer
processes.

For example, at the end of a crash recovery, this is useful to know if a
checkpoint is running in the startup process, while previously the ps
display may only show some information about "recovering" something,
that can be confusing while a checkpoint runs.

Author: Justin Pryzby
Reviewed-by: Nathan Bossart, Kirk Jamison, Fujii Masao, Michael Paquier
Discussion: https://postgr.es/m/20200818225238.GP17022@telsasoft.com
This commit is contained in:
Michael Paquier 2020-12-14 11:53:58 +09:00
parent a1b8aa1e4e
commit df9274adf3
1 changed files with 45 additions and 0 deletions
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45
src/backend/access/transam/xlog.c
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@ -8687,6 +8687,39 @@ UpdateCheckPointDistanceEstimate(uint64 nbytes)
(0.90 * CheckPointDistanceEstimate + 0.10 * (double) nbytes);
}
/*
* Update the ps display for a process running a checkpoint. Note that
* this routine should not do any allocations so as it can be called
* from a critical section.
*/
static void
update_checkpoint_display(int flags, bool restartpoint, bool reset)
{
/*
* The status is reported only for end-of-recovery and shutdown
* checkpoints or shutdown restartpoints. Updating the ps display is
* useful in those situations as it may not be possible to rely on
* pg_stat_activity to see the status of the checkpointer or the startup
* process.
*/
if ((flags & (CHECKPOINT_END_OF_RECOVERY | CHECKPOINT_IS_SHUTDOWN)) == 0)
return;
if (reset)
set_ps_display("");
else
{
char activitymsg[128];
snprintf(activitymsg, sizeof(activitymsg), "performing %s%s%s",
(flags & CHECKPOINT_END_OF_RECOVERY) ? "end-of-recovery " : "",
(flags & CHECKPOINT_IS_SHUTDOWN) ? "shutdown " : "",
restartpoint ? "restartpoint" : "checkpoint");
set_ps_display(activitymsg);
}
}
/*
* Perform a checkpoint --- either during shutdown, or on-the-fly
*
@ -8905,6 +8938,9 @@ CreateCheckPoint(int flags)
if (log_checkpoints)
LogCheckpointStart(flags, false);
/* Update the process title */
update_checkpoint_display(flags, false, false);
TRACE_POSTGRESQL_CHECKPOINT_START(flags);
/*
@ -9120,6 +9156,9 @@ CreateCheckPoint(int flags)
/* Real work is done, but log and update stats before releasing lock. */
LogCheckpointEnd(false);
/* Reset the process title */
update_checkpoint_display(flags, false, true);
TRACE_POSTGRESQL_CHECKPOINT_DONE(CheckpointStats.ckpt_bufs_written,
NBuffers,
CheckpointStats.ckpt_segs_added,
@ -9374,6 +9413,9 @@ CreateRestartPoint(int flags)
if (log_checkpoints)
LogCheckpointStart(flags, true);
/* Update the process title */
update_checkpoint_display(flags, true, false);
CheckPointGuts(lastCheckPoint.redo, flags);
/*
@ -9492,6 +9534,9 @@ CreateRestartPoint(int flags)
/* Real work is done, but log and update before releasing lock. */
LogCheckpointEnd(true);
/* Reset the process title */
update_checkpoint_display(flags, true, true);
xtime = GetLatestXTime();
ereport((log_checkpoints ? LOG : DEBUG2),
(errmsg("recovery restart point at %X/%X",