8000 Add basic code for support of DSM cache. · postgrespro/aqo@ae557bd · GitHub
[go: up one dir, main page]
Skip to content

Commit ae557bd

Browse files
danolivodanolivo
committed
Add basic code for support of DSM cache.
1 parent 303a9d9 commit ae557bd

File tree

4 files changed

+92
-2
lines changed

4 files changed

+92
-2
lines changed

‎Makefile

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,7 @@ PGFILEDESC = "AQO - Adaptive Query Optimization"
66
MODULE_big = aqo
77
OBJS = aqo.o auto_tuning.o cardinality_estimation.o cardinality_hooks.o \
88
hash.o machine_learning.o path_utils.o postprocessing.o preprocessing.o \
9-
selectivity_cache.o storage.o utils.o learn_cache.o $(WIN32RES)
9+
selectivity_cache.o storage.o utils.o learn_cache.o aqo_shared.o $(WIN32RES)
1010

1111
TAP_TESTS = 1
1212

‎aqo.c

Lines changed: 8 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -18,6 +18,7 @@
1818
#include "utils/selfuncs.h"
1919

2020
#include "aqo.h"
21+
#include "aqo_shared.h"
2122
#include "cardinality_hooks.h"
2223
#include "path_utils.h"
2324
#include "preprocessing.h"
@@ -125,7 +126,7 @@ _PG_init(void)
125126
{
126127
/*
127128
* In order to create our shared memory area, we have to be loaded via
128-
* shared_preload_libraries. If not, report an ERROR.
129+
* shared_preload_libraries. If not, report an ERROR.
129130
*/
130131
if (!process_shared_preload_libraries_in_progress)
131132
ereport(ERROR,
@@ -198,6 +199,8 @@ _PG_init(void)
198199
NULL
199200
);
200201

202+
prev_shmem_startup_hook = shmem_startup_hook;
203+
shmem_startup_hook = aqo_init_shmem;
201204
prev_planner_hook = planner_hook;
202205
planner_hook = aqo_planner;
203206
prev_ExecutorStart_hook = ExecutorStart_hook;
@@ -239,6 +242,10 @@ _PG_init(void)
239242
ALLOCSET_DEFAULT_SIZES);
240243
RegisterResourceReleaseCallback(aqo_free_callback, NULL);
241244
RegisterAQOPlanNodeMethods();
245+
246+
MarkGUCPrefixReserved("aqo");
247+
RequestAddinShmemSpace(MAXALIGN(sizeof(AQOSharedState)));
248+
242249
lc_init();
243250
}
244251

‎aqo_shared.c

Lines changed: 61 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,61 @@
1+
/*
2+
*
3+
*/
4+
5+
#include "postgres.h"
6+
7+
#include "storage/shmem.h"
8+
9+
#include "aqo_shared.h"
10+
11+
shmem_startup_hook_type prev_shmem_startup_hook = NULL;
12+
static AQOSharedState *aqo_state = NULL;
13+
unsigned long temp_storage_size = 1024 * 1024; /* Storage size, in bytes */
14+
void *temp_storage = NULL;
15+
16+
static void
17+
attach_dsm_segment(void)
18+
{
19+
dsm_segment *seg;
20+
21+
LWLockAcquire(&aqo_state->lock, LW_EXCLUSIVE);
22+
23+
if (aqo_state->dsm_handler != DSM_HANDLE_INVALID)
24+
{
25+
seg = dsm_attach(aqo_state->dsm_handler);
26+
}
27+
else
28+
{
29+
seg = dsm_create(temp_storage_size, 0);
30+
aqo_state->dsm_handler = dsm_segment_handle(seg);
31+
}
32+
33+
temp_storage = dsm_segment_address(seg);
34+
LWLockRelease(&aqo_state->lock);
35+
}
36+
37+
static void
38+
aqo_detach_shmem(int code, Datum arg)
39+
{
40+
dsm_handle handler = *(dsm_handle *) arg;
41+
dsm_detach(dsm_find_mapping(handler));
42+
}
43+
44+
void
45+
aqo_init_shmem(void)
46+
{
47+
bool found;
48+
49+
LWLockAcquire(AddinShmemInitLock, LW_EXCLUSIVE);
50+
aqo_state = ShmemInitStruct("aqo", sizeof(AQOSharedState), &found);
51+
if (!found)
52+
{
53+
/* First time through ... */
54+
LWLockInitialize(&aqo_state->lock, LWLockNewTrancheId());
55+
aqo_state->dsm_handler = DSM_HANDLE_INVALID;
56+
}
57+
LWLockRelease(AddinShmemInitLock);
58+
59+
LWLockRegisterTranche(aqo_state->lock.tranche, "aqo");
60+
on_shmem_exit(aqo_detach_shmem, (Datum) &aqo_state->dsm_handler);
61+
}

‎aqo_shared.h

Lines changed: 22 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,22 @@
1+
#ifndef AQO_SHARED_H
2+
#define AQO_SHARED_H
3+
4+
5+
#include "storage/dsm.h"
6+
#include "storage/ipc.h"
7+
#include "storage/lwlock.h"
8+
9+
10+
typedef struct AQOSharedState
11+
{
12+
LWLock lock; /* mutual exclusion */
13+
dsm_handle dsm_handler;
14+
} AQOSharedState;
15+
16+
17+
extern shmem_startup_hook_type prev_shmem_startup_hook;
18+
19+
20+
extern void aqo_init_shmem(void);
21+
22+
#endif /* AQO_SHARED_H */

0 commit comments

Comments
 (0)
0