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active defrag improvements

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This commit is contained in:
oranagra 2017-01-02 09:42:32 +02:00
parent 7aa9e6d2ae
commit 5ab6a54cc6
4 changed files with 63 additions and 44 deletions
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3
src/debug.c
View File

@ -457,8 +457,9 @@ void debugCommand(client *c) {
if (valsize==0)
val = createStringObject(buf,strlen(buf));
else {
int buflen = strlen(buf);
val = createStringObject(NULL,valsize);
memset(val->ptr, 0, valsize);
memcpy(val->ptr, buf, valsize<=buflen? valsize: buflen);
}
dbAdd(c->db,key,val);
signalModifiedKey(c->db,key);

82
src/defrag.c
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@ -94,15 +94,17 @@ sds activeDefragSds(sds sdsptr) {
* returns NULL in case the allocatoin wasn't moved.
* when it returns a non-null value, the old pointer was already released
* and should NOT be accessed. */
robj *activeDefragStringOb(robj* ob) {
robj *activeDefragStringOb(robj* ob, int *defragged) {
robj *ret = NULL;
if (ob->refcount!=1)
return NULL;
/* try to defrag robj (only if not an EMBSTR type (handled below) */
if (ob->type!=OBJ_STRING || ob->encoding!=OBJ_ENCODING_EMBSTR) {
if ((ret = activeDefragAlloc(ob)))
if ((ret = activeDefragAlloc(ob))) {
ob = ret;
(*defragged)++;
}
}
/* try to defrag string object */
@ -111,18 +113,14 @@ robj *activeDefragStringOb(robj* ob) {
sds newsds = activeDefragSds((sds)ob->ptr);
if (newsds) {
ob->ptr = newsds;
/* we don't need to change the return value here.
* we can return NULL if 'ret' is still NULL (since the object pointer itself wasn't changed).
* but we set return value to ob as an indication that we defragged a pointer (for stats).
* NOTE: if ret is already set and the robj was moved, then our stats will be a bit off
* since two pointers were moved, but we show only one in the stats */
ret = ob;
(*defragged)++;
}
} else if (ob->encoding==OBJ_ENCODING_EMBSTR) {
/* the sds is embedded in the object allocation, calculate the offset and update the pointer in the new allocation */
long ofs = (intptr_t)ob->ptr - (intptr_t)ob;
if ((ret = activeDefragAlloc(ob))) {
ret->ptr = (void*)((intptr_t)ret + ofs);
(*defragged)++;
}
} else if (ob->encoding!=OBJ_ENCODING_INT) {
serverPanic("Unknown string encoding");
@ -191,18 +189,18 @@ void zslUpdateNode(zskiplist *zsl, zskiplistNode *oldnode, zskiplistNode *newnod
if (update[i]->level[i].forward == oldnode)
update[i]->level[i].forward = newnode;
}
if (zsl->header==oldnode)
zsl->header = newnode;
if (zsl->tail==oldnode)
zsl->tail = newnode;
serverAssert(zsl->header!=oldnode);
if (newnode->level[0].forward) {
serverAssert(newnode->level[0].forward->backward==oldnode);
newnode->level[0].forward->backward = newnode;
} else {
serverAssert(zsl->tail==oldnode);
zsl->tail = newnode;
}
}
/* Defrag helper for sorted set.
* Update the robj pointer, defrag the struct and return the new score reference.
* Update the robj pointer, defrag the skiplist struct and return the new score reference.
* we may not access oldele pointer (not even the pointer stored in the skiplist), as it was already freed.
* newele may be null, in which case we only need to defrag the skiplist, but not update the obj pointer.
* when return value is non-NULL, it is the score reference that must be updated in the dict record. */
@ -229,7 +227,7 @@ double *zslDefrag(zskiplist *zsl, double score, sds oldele, sds newele) {
serverAssert(x && score == x->score && x->ele==oldele);
if (newele)
x->ele = newele;
/* try to defrag the skiplist record itself */
newx = activeDefragAlloc(x);
if (newx) {
@ -239,6 +237,28 @@ double *zslDefrag(zskiplist *zsl, double score, sds oldele, sds newele) {
return NULL;
}
/* Utility function that replaces an old key pointer in the dictionary with a new pointer.
* Additionally, we try to defrag the dictEntry in that dict.
* oldkey mey be a dead pointer and should not be accessed (we get a pre-calculated hash value).
* newkey may be null if the key pointer wasn't moved.
* return value is the the dictEntry if found, or NULL if not found.
* NOTE: this is very ugly code, but it let's us avoid the complication of doing a scan on another dict. */
dictEntry* replaceSateliteDictKeyPtrAndOrDifragDictEntry(dict *d, sds oldkey, sds newkey, unsigned int hash, int *defragged) {
dictEntry **deref = dictFindEntryRefByPtrAndHash(d, oldkey, hash);
if (deref) {
dictEntry *de = *deref;
dictEntry *newde = activeDefragAlloc(de);
if (newde) {
de = *deref = newde;
(*defragged)++;
}
if (newkey)
de->key = newkey;
return de;
}
return NULL;
}
/* for each key we scan in the main dict, this function will attempt to defrag all the various pointers it has.
* returns a stat of how many pointers were moved. */
int defargKey(redisDb *db, dictEntry *de) {
@ -252,24 +272,21 @@ int defargKey(redisDb *db, dictEntry *de) {
/* try to defrag the key name */
newsds = activeDefragSds(keysds);
if (newsds) {
de->key = newsds;
if (dictSize(db->expires)) {
/* Dirty code:
* i can't search in db->expires for that key after i already released the pointer it holds
* it won't be able to do the string compare */
unsigned int hash = dictGetHash(db->dict, newsds);
dictReplaceKeyPtr(db->expires, keysds, newsds, hash);
}
defragged++;
if (newsds)
defragged++, de->key = newsds;
if (dictSize(db->expires)) {
/* Dirty code:
* i can't search in db->expires for that key after i already released the pointer it holds
* it won't be able to do the string compare */
unsigned int hash = dictGetHash(db->dict, de->key);
replaceSateliteDictKeyPtrAndOrDifragDictEntry(db->expires, keysds, newsds, hash, &defragged);
}
/* try to defrag robj and / or string value */
ob = dictGetVal(de);
if ((newob = activeDefragStringOb(ob))) {
if ((newob = activeDefragStringOb(ob, &defragged))) {
de->v.val = newob;
ob = newob;
defragged++;
}
if (ob->type == OBJ_STRING) {
@ -328,13 +345,15 @@ int defargKey(redisDb *db, dictEntry *de) {
defragged++, ob->ptr = newzl;
} else if (ob->encoding == OBJ_ENCODING_SKIPLIST) {
zset *zs = (zset*)ob->ptr;
zset *newzs = activeDefragAlloc(zs);
zset *newzs;
zskiplist *newzsl;
if (newzs)
struct zskiplistNode *newheader;
if ((newzs = activeDefragAlloc(zs)))
defragged++, ob->ptr = zs = newzs;
newzsl = activeDefragAlloc(zs->zsl);
if (newzsl)
if ((newzsl = activeDefragAlloc(zs->zsl)))
defragged++, zs->zsl = newzsl;
if ((newheader = activeDefragAlloc(zs->zsl->header)))
defragged++, zs->zsl->header = newheader;
d = zs->dict;
di = dictGetIterator(d);
while((de = dictNext(di)) != NULL) {
@ -383,7 +402,6 @@ int defargKey(redisDb *db, dictEntry *de) {
/* defrag scan callback for the main db dictionary */
void defragScanCallback(void *privdata, const dictEntry *de) {
/* TODO: defrag the dictEntry (and also the entriy in expire dict). */
int defragged = defargKey((redisDb*)privdata, (dictEntry*)de);
server.stat_active_defrag_hits += defragged;
if(defragged)
@ -524,4 +542,4 @@ void activeDefragCycle(void) {
/* not implemented yet*/
}
#endif
#endif

20
src/dict.c
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@ -1048,25 +1048,25 @@ unsigned int dictGetHash(dict *d, const void *key) {
return dictHashKey(d, key);
}
/* Replace an old key pointer in the dictionary with a new pointer.
/* Finds the dictEntry reference by using pointer and pre-calculated hash.
* oldkey is a dead pointer and should not be accessed.
* the hash value should be provided using dictGetHash.
* no string / key comparison is performed.
* return value is the dictEntry if found, or NULL if not found. */
dictEntry *dictReplaceKeyPtr(dict *d, const void *oldptr, void *newptr, unsigned int hash) {
dictEntry *he;
* return value is the reference to the dictEntry if found, or NULL if not found. */
dictEntry **dictFindEntryRefByPtrAndHash(dict *d, const void *oldptr, unsigned int hash) {
dictEntry *he, **heref;
unsigned int idx, table;
if (d->ht[0].used + d->ht[1].used == 0) return NULL; /* dict is empty */
for (table = 0; table <= 1; table++) {
idx = hash & d->ht[table].sizemask;
he = d->ht[table].table[idx];
heref = &d->ht[table].table[idx];
he = *heref;
while(he) {
if (oldptr==he->key) {
he->key = newptr;
return he;
}
he = he->next;
if (oldptr==he->key)
return heref;
heref = &he->next;
he = *heref;
}
if (!dictIsRehashing(d)) return NULL;
}

2
src/dict.h
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@ -179,7 +179,7 @@ void dictSetHashFunctionSeed(unsigned int initval);
unsigned int dictGetHashFunctionSeed(void);
unsigned long dictScan(dict *d, unsigned long v, dictScanFunction *fn, dictScanBucketFunction *bucketfn, void *privdata);
unsigned int dictGetHash(dict *d, const void *key);
dictEntry *dictReplaceKeyPtr(dict *d, const void *oldptr, void *newptr, unsigned int hash);
dictEntry **dictFindEntryRefByPtrAndHash(dict *d, const void *oldptr, unsigned int hash);
/* Hash table types */
extern dictType dictTypeHeapStringCopyKey;