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Overview
| Comment: | Small size and performance improvement in pcacheManageDirtyList() by not zeroing the PgHdr.pDirtyNext and PgHdr.pDirtyPrev pointers for PgHdr objects that are not on the dirty list. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
919863b14859d958d6c078097faae020 |
| User & Date: | drh 2017-09-01 12:18:41 |
Context
|
2017-09-01
| ||
| 12:57 | Remove an obsolete optimization in pcache that due to more recent changes was recently making the code a little slower. check-in: c4e7e175 user: drh tags: trunk | |
| 12:18 | Small size and performance improvement in pcacheManageDirtyList() by not zeroing the PgHdr.pDirtyNext and PgHdr.pDirtyPrev pointers for PgHdr objects that are not on the dirty list. check-in: 919863b1 user: drh tags: trunk | |
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2017-08-31
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| 21:11 | Clarify the documentation about "protected" versus "unprotected" sqlite3_value objects. No changes to code. check-in: 4094a341 user: drh tags: trunk | |
Changes
Changes to src/pcache.c.
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p->pDirty = pPage->pDirtyNext;
assert( p->bPurgeable || p->eCreate==2 );
if( p->pDirty==0 ){ /*OPTIMIZATION-IF-TRUE*/
assert( p->bPurgeable==0 || p->eCreate==1 );
p->eCreate = 2;
}
}
pPage->pDirtyNext = 0;
pPage->pDirtyPrev = 0;
}
if( addRemove & PCACHE_DIRTYLIST_ADD ){
assert( pPage->pDirtyNext==0 && pPage->pDirtyPrev==0 && p->pDirty!=pPage );
pPage->pDirtyNext = p->pDirty;
if( pPage->pDirtyNext ){
assert( pPage->pDirtyNext->pDirtyPrev==0 );
pPage->pDirtyNext->pDirtyPrev = pPage;
}else{
p->pDirtyTail = pPage;
if( p->bPurgeable ){
|
< < < < > |
187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 |
p->pDirty = pPage->pDirtyNext;
assert( p->bPurgeable || p->eCreate==2 );
if( p->pDirty==0 ){ /*OPTIMIZATION-IF-TRUE*/
assert( p->bPurgeable==0 || p->eCreate==1 );
p->eCreate = 2;
}
}
}
if( addRemove & PCACHE_DIRTYLIST_ADD ){
pPage->pDirtyPrev = 0;
pPage->pDirtyNext = p->pDirty;
if( pPage->pDirtyNext ){
assert( pPage->pDirtyNext->pDirtyPrev==0 );
pPage->pDirtyNext->pDirtyPrev = pPage;
}else{
p->pDirtyTail = pPage;
if( p->bPurgeable ){
|
Changes to src/pcache.h.
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** Elements above, except pCache, are public. All that follow are ** private to pcache.c and should not be accessed by other modules. ** pCache is grouped with the public elements for efficiency. */ i16 nRef; /* Number of users of this page */ PgHdr *pDirtyNext; /* Next element in list of dirty pages */ PgHdr *pDirtyPrev; /* Previous element in list of dirty pages */ }; /* Bit values for PgHdr.flags */ #define PGHDR_CLEAN 0x001 /* Page not on the PCache.pDirty list */ #define PGHDR_DIRTY 0x002 /* Page is on the PCache.pDirty list */ #define PGHDR_WRITEABLE 0x004 /* Journaled and ready to modify */ #define PGHDR_NEED_SYNC 0x008 /* Fsync the rollback journal before |
> > |
39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 |
** Elements above, except pCache, are public. All that follow are ** private to pcache.c and should not be accessed by other modules. ** pCache is grouped with the public elements for efficiency. */ i16 nRef; /* Number of users of this page */ PgHdr *pDirtyNext; /* Next element in list of dirty pages */ PgHdr *pDirtyPrev; /* Previous element in list of dirty pages */ /* NB: pDirtyNext and pDirtyPrev are undefined if the ** PgHdr object is not dirty */ }; /* Bit values for PgHdr.flags */ #define PGHDR_CLEAN 0x001 /* Page not on the PCache.pDirty list */ #define PGHDR_DIRTY 0x002 /* Page is on the PCache.pDirty list */ #define PGHDR_WRITEABLE 0x004 /* Journaled and ready to modify */ #define PGHDR_NEED_SYNC 0x008 /* Fsync the rollback journal before |