/ Check-in [32a62e3b]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Additional debugging and tracing logic for pcache.c, turned off by default using an "#if 0".
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1:32a62e3bd46cf58586617d3f8b1a971c91df205e
User & Date: drh 2016-05-13 04:24:25
Context
2016-05-13
11:50
Fix pager_end_transaction() to ensure that a ROLLBACK does not clobber unwritten pages in a TEMP file pcache. check-in: 9495d338 user: drh tags: trunk
04:24
Additional debugging and tracing logic for pcache.c, turned off by default using an "#if 0". check-in: 32a62e3b user: drh tags: trunk
2016-05-12
19:17
Disable ALWAYS and NEVER when compiled with SQLITE_MUTATION_TEST. check-in: 24d9fbc1 user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/pcache.c.

53
54
55
56
57
58
59
60
61
























62
63

64
65
66
67
68
69
70
...
138
139
140
141
142
143
144

145
146
147
148
149
150
151
152
153
154

155
156
157
158
159
160
161
...
348
349
350
351
352
353
354

355
356
357
358
359
360
361
...
492
493
494
495
496
497
498

499
500
501
502
503
504
505
506
507
508

509
510
511
512
513
514
515
  sqlite3_pcache *pCache;             /* Pluggable cache module */
};

/*
** Debug tracing macros
*/
#if defined(SQLITE_DEBUG) && 0
  int sqlite3PcacheTrace = 1;
# define pcacheTrace(X) if(sqlite3PcacheTrace){sqlite3DebugPrintf X;}
























#else
# define pcacheTrace(X)

#endif

/********************************** Linked List Management ********************/

/* Allowed values for second argument to pcacheManageDirtyList() */
#define PCACHE_DIRTYLIST_REMOVE   1    /* Remove pPage from dirty list */
#define PCACHE_DIRTYLIST_ADD      2    /* Add pPage to the dirty list */
................................................................................
    ** entries of the dirty-list for a page with NEED_SYNC clear anyway.  */
    if( !p->pSynced 
     && 0==(pPage->flags&PGHDR_NEED_SYNC)   /*OPTIMIZATION-IF-FALSE*/
    ){
      p->pSynced = pPage;
    }
  }

}

/*
** Wrapper around the pluggable caches xUnpin method. If the cache is
** being used for an in-memory database, this function is a no-op.
*/
static void pcacheUnpin(PgHdr *p){
  if( p->pCache->bPurgeable ){
    pcacheTrace(("%p.UNPIN %d\n", p->pCache, p->pgno));
    sqlite3GlobalConfig.pcache2.xUnpin(p->pCache->pCache, p->pPage, 0);

  }
}

/*
** Compute the number of pages of cache requested.   p->szCache is the
** cache size requested by the "PRAGMA cache_size" statement.
*/
................................................................................
                  "spill page %d making room for %d - cache used: %d/%d",
                  pPg->pgno, pgno,
                  sqlite3GlobalConfig.pcache.xPagecount(pCache->pCache),
                numberOfCachePages(pCache));
#endif
      pcacheTrace(("%p.SPILL %d\n",pCache,pPg->pgno));
      rc = pCache->xStress(pCache->pStress, pPg);

      if( rc!=SQLITE_OK && rc!=SQLITE_BUSY ){
        return rc;
      }
    }
  }
  *ppPage = sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache, pgno, 2);
  return *ppPage==0 ? SQLITE_NOMEM_BKPT : SQLITE_OK;
................................................................................
}

/*
** Make every page in the cache clean.
*/
void sqlite3PcacheCleanAll(PCache *pCache){
  PgHdr *p;

  while( (p = pCache->pDirty)!=0 ){
    sqlite3PcacheMakeClean(p);
  }
}

/*
** Clear the PGHDR_NEED_SYNC and PGHDR_WRITEABLE flag from all dirty pages.
*/
void sqlite3PcacheClearWritable(PCache *pCache){
  PgHdr *p;

  for(p=pCache->pDirty; p; p=p->pDirtyNext){
    p->flags &= ~(PGHDR_NEED_SYNC|PGHDR_WRITEABLE);
  }
  pCache->pSynced = pCache->pDirtyTail;
}

/*







|

>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
|

>







 







>










>







 







>







 







>










>







53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
...
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
...
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
...
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
  sqlite3_pcache *pCache;             /* Pluggable cache module */
};

/*
** Debug tracing macros
*/
#if defined(SQLITE_DEBUG) && 0
  int sqlite3PcacheTrace = 2;
# define pcacheTrace(X) if(sqlite3PcacheTrace){sqlite3DebugPrintf X;}
  void pcacheDump(PCache *pCache){
    int N;
    int i, j;
    sqlite3_pcache_page *pLower;
    PgHdr *pPg;
    unsigned char *a;
  
    if( sqlite3PcacheTrace<2 ) return;
    if( pCache->pCache==0 ) return;
    N = sqlite3PcachePagecount(pCache);
    if( N>5 ) N = 5;
    for(i=1; i<=N; i++){
       pLower = sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache, i, 0);
       if( pLower==0 ) continue;
       pPg = (PgHdr*)pLower->pExtra;
       printf("%3d: nRef %2d flgs %02x data ", i, pPg->nRef, pPg->flags);
       a = (unsigned char *)pLower->pBuf;
       for(j=0; j<12; j++) printf("%02x", a[j]);
       printf("\n");
       if( pPg->pPage==0 ){
         sqlite3GlobalConfig.pcache2.xUnpin(pCache->pCache, pLower, 0);
       }
    }
  }
  #else
# define pcacheTrace(X)
# define pcacheDump(X)
#endif

/********************************** Linked List Management ********************/

/* Allowed values for second argument to pcacheManageDirtyList() */
#define PCACHE_DIRTYLIST_REMOVE   1    /* Remove pPage from dirty list */
#define PCACHE_DIRTYLIST_ADD      2    /* Add pPage to the dirty list */
................................................................................
    ** entries of the dirty-list for a page with NEED_SYNC clear anyway.  */
    if( !p->pSynced 
     && 0==(pPage->flags&PGHDR_NEED_SYNC)   /*OPTIMIZATION-IF-FALSE*/
    ){
      p->pSynced = pPage;
    }
  }
  pcacheDump(p);
}

/*
** Wrapper around the pluggable caches xUnpin method. If the cache is
** being used for an in-memory database, this function is a no-op.
*/
static void pcacheUnpin(PgHdr *p){
  if( p->pCache->bPurgeable ){
    pcacheTrace(("%p.UNPIN %d\n", p->pCache, p->pgno));
    sqlite3GlobalConfig.pcache2.xUnpin(p->pCache->pCache, p->pPage, 0);
    pcacheDump(p->pCache);
  }
}

/*
** Compute the number of pages of cache requested.   p->szCache is the
** cache size requested by the "PRAGMA cache_size" statement.
*/
................................................................................
                  "spill page %d making room for %d - cache used: %d/%d",
                  pPg->pgno, pgno,
                  sqlite3GlobalConfig.pcache.xPagecount(pCache->pCache),
                numberOfCachePages(pCache));
#endif
      pcacheTrace(("%p.SPILL %d\n",pCache,pPg->pgno));
      rc = pCache->xStress(pCache->pStress, pPg);
      pcacheDump(pCache);
      if( rc!=SQLITE_OK && rc!=SQLITE_BUSY ){
        return rc;
      }
    }
  }
  *ppPage = sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache, pgno, 2);
  return *ppPage==0 ? SQLITE_NOMEM_BKPT : SQLITE_OK;
................................................................................
}

/*
** Make every page in the cache clean.
*/
void sqlite3PcacheCleanAll(PCache *pCache){
  PgHdr *p;
  pcacheTrace(("%p.CLEAN-ALL\n",pCache));
  while( (p = pCache->pDirty)!=0 ){
    sqlite3PcacheMakeClean(p);
  }
}

/*
** Clear the PGHDR_NEED_SYNC and PGHDR_WRITEABLE flag from all dirty pages.
*/
void sqlite3PcacheClearWritable(PCache *pCache){
  PgHdr *p;
  pcacheTrace(("%p.CLEAR-WRITEABLE\n",pCache));
  for(p=pCache->pDirty; p; p=p->pDirtyNext){
    p->flags &= ~(PGHDR_NEED_SYNC|PGHDR_WRITEABLE);
  }
  pCache->pSynced = pCache->pDirtyTail;
}

/*