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Commit8f6f7e6

Browse files
Oleg Tselebrovskiyshinderuk
Oleg Tselebrovskiy
authored andcommitted
Store GUC variables in local process memory to avoid IPC shenanigans
For more context and reasoning see issue#85
1 parent28687a1 commit8f6f7e6

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5 files changed

+118
-194
lines changed

5 files changed

+118
-194
lines changed

‎README.md

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -158,9 +158,9 @@ If `pg_wait_sampling.sample_cpu` is set to true then processes that are not
158158
waiting on anything are also sampled. The wait event columns for such processes
159159
will be NULL.
160160

161-
These GUCs are allowed tobe changedby superuser. Also, they are placed into
162-
shared memory. Thus, they could be changed from any backend and affects worker
163-
runtime.
161+
Values of these GUC variables canbe changedonly in config file or with ALTER SYSTEM.
162+
Then you need to reload server's configuration (such as with pg_reload_conf function)
163+
for changes to take effect.
164164

165165
See
166166
[PostgreSQL documentation](http://www.postgresql.org/docs/devel/static/monitoring-stats.html#WAIT-EVENT-TABLE)

‎collector.c

Lines changed: 17 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -16,6 +16,7 @@
1616
#include"funcapi.h"
1717
#include"miscadmin.h"
1818
#include"postmaster/bgworker.h"
19+
#include"postmaster/interrupt.h"
1920
#include"storage/ipc.h"
2021
#include"storage/procarray.h"
2122
#include"storage/procsignal.h"
@@ -151,7 +152,7 @@ probe_waits(History *observations, HTAB *profile_hash,
151152
TimestampTzts=GetCurrentTimestamp();
152153

153154
/* Realloc waits history if needed */
154-
newSize=pgws_collector_hdr->historySize;
155+
newSize=pgws_historySize;
155156
if (observations->count!=newSize)
156157
realloc_history(observations,newSize);
157158

@@ -170,7 +171,7 @@ probe_waits(History *observations, HTAB *profile_hash,
170171
item.pid=proc->pid;
171172
item.wait_event_info=proc->wait_event_info;
172173

173-
if (pgws_collector_hdr->profileQueries)
174+
if (pgws_profileQueries)
174175
item.queryId=pgws_proc_queryids[i];
175176
else
176177
item.queryId=0;
@@ -289,7 +290,7 @@ make_profile_hash()
289290
hash_ctl.hash=tag_hash;
290291
hash_ctl.hcxt=TopMemoryContext;
291292

292-
if (pgws_collector_hdr->profileQueries)
293+
if (pgws_profileQueries)
293294
hash_ctl.keysize= offsetof(ProfileItem,count);
294295
else
295296
hash_ctl.keysize= offsetof(ProfileItem,queryId);
@@ -346,6 +347,7 @@ pgws_collector_main(Datum main_arg)
346347
* partitipate to the ProcSignal infrastructure.
347348
*/
348349
pqsignal(SIGTERM,handle_sigterm);
350+
pqsignal(SIGHUP,SignalHandlerForConfigReload);
349351
pqsignal(SIGUSR1,procsignal_sigusr1_handler);
350352
BackgroundWorkerUnblockSignals();
351353
InitPostgresCompat(NULL,InvalidOid,NULL,InvalidOid,0,NULL);
@@ -361,7 +363,7 @@ pgws_collector_main(Datum main_arg)
361363
collector_context=AllocSetContextCreate(TopMemoryContext,
362364
"pg_wait_sampling context",ALLOCSET_DEFAULT_SIZES);
363365
old_context=MemoryContextSwitchTo(collector_context);
364-
alloc_history(&observations,pgws_collector_hdr->historySize);
366+
alloc_history(&observations,pgws_historySize);
365367
MemoryContextSwitchTo(old_context);
366368

367369
ereport(LOG, (errmsg("pg_wait_sampling collector started")));
@@ -375,29 +377,31 @@ pgws_collector_main(Datum main_arg)
375377
shm_mq_handle*mqh;
376378
int64history_diff,
377379
profile_diff;
378-
inthistory_period,
379-
profile_period;
380380
boolwrite_history,
381381
write_profile;
382382

383383
/* We need an explicit call for at least ProcSignal notifications. */
384384
CHECK_FOR_INTERRUPTS();
385385

386+
if (ConfigReloadPending)
387+
{
388+
ConfigReloadPending= false;
389+
ProcessConfigFile(PGC_SIGHUP);
390+
}
391+
386392
/* Wait calculate time to next sample for history or profile */
387393
current_ts=GetCurrentTimestamp();
388394

389395
history_diff=millisecs_diff(history_ts,current_ts);
390396
profile_diff=millisecs_diff(profile_ts,current_ts);
391-
history_period=pgws_collector_hdr->historyPeriod;
392-
profile_period=pgws_collector_hdr->profilePeriod;
393397

394-
write_history= (history_diff >= (int64)history_period);
395-
write_profile= (profile_diff >= (int64)profile_period);
398+
write_history= (history_diff >= (int64)pgws_historyPeriod);
399+
write_profile= (profile_diff >= (int64)pgws_profilePeriod);
396400

397401
if (write_history||write_profile)
398402
{
399403
probe_waits(&observations,profile_hash,
400-
write_history,write_profile,pgws_collector_hdr->profilePid);
404+
write_history,write_profile,pgws_profilePid);
401405

402406
if (write_history)
403407
{
@@ -421,8 +425,8 @@ pgws_collector_main(Datum main_arg)
421425
* shared memory.
422426
*/
423427
rc=WaitLatch(&MyProc->procLatch,WL_LATCH_SET |WL_TIMEOUT |WL_POSTMASTER_DEATH,
424-
Min(history_period- (int)history_diff,
425-
profile_period- (int)profile_diff),PG_WAIT_EXTENSION);
428+
Min(pgws_historyPeriod- (int)history_diff,
429+
pgws_historyPeriod- (int)profile_diff),PG_WAIT_EXTENSION);
426430

427431
if (rc&WL_POSTMASTER_DEATH)
428432
proc_exit(1);

‎compat.h

Lines changed: 0 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -51,18 +51,4 @@ InitPostgresCompat(const char *in_dbname, Oid dboid,
5151
#endif
5252
}
5353

54-
staticinlinevoid
55-
get_guc_variables_compat(structconfig_generic***vars,int*num_vars)
56-
{
57-
Assert(vars!=NULL);
58-
Assert(num_vars!=NULL);
59-
60-
#ifPG_VERSION_NUM >=160000
61-
*vars=get_guc_variables(num_vars);
62-
#else
63-
*vars=get_guc_variables();
64-
*num_vars=GetNumConfigOptions();
65-
#endif
66-
}
67-
6854
#endif

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