}
}
if (best == NULL) {
- /* Was not able to fix a single object... we should check if our
+ /* Not able to free a single object? we should check if our
* IO queues have stuff in queue, and try to consume the queue
* otherwise we'll use an infinite amount of memory if changes to
* the dataset are faster than I/O */
return REDIS_OK;
}
-/* Return true if it's safe to swap out objects in a given moment.
- * Basically we don't want to swap objects out while there is a BGSAVE
- * or a BGAEOREWRITE running in backgroud. */
-int dsCanTouchDiskStore(void) {
- return (server.bgsavechildpid == -1 && server.bgrewritechildpid == -1);
-}
-
/* ==================== Disk store negative caching ========================
*
* When disk store is enabled, we need negative caching, that is, to remember
* of an unix pipe in order to "awake" the main thread, and this function
* is called.
*
- * If privdata != NULL the function will try to put more jobs in the queue
- * of IO jobs to process as more room is made. */
+ * If privdata == NULL the function will try to put more jobs in the queue
+ * of IO jobs to process as more room is made. privdata is equal to NULL
+ * when the function is called from the event loop, so we want to push
+ * more IO jobs in the queue. Instead when the function is called by
+ * other functions that want to create a write-barrier to avoid race
+ * conditions we don't push new jobs in the queue. */
void vmThreadedIOCompletedJob(aeEventLoop *el, int fd, void *privdata,
int mask)
{
}
cacheScheduleIODelFlag(j->db,j->key,REDIS_IO_LOADINPROG);
handleClientsBlockedOnSwappedKey(j->db,j->key);
- freeIOJob(j);
} else if (j->type == REDIS_IOJOB_SAVE) {
cacheScheduleIODelFlag(j->db,j->key,REDIS_IO_SAVEINPROG);
- freeIOJob(j);
}
+ freeIOJob(j);
processed++;
- if (privdata != NULL) cacheScheduleIOPushJobs(0);
+ if (privdata == NULL) cacheScheduleIOPushJobs(0);
if (processed == toprocess) return;
}
if (retval < 0 && errno != EAGAIN) {
redisLog(REDIS_DEBUG,"Queued IO Job %p type %d about key '%s'\n",
(void*)j, j->type, (char*)j->key->ptr);
listAddNodeTail(server.io_newjobs,j);
- if (server.io_active_threads < server.vm_max_threads)
- spawnIOThread();
}
/* Consume all the IO scheduled operations, and all the thread IO jobs
listAddNodeTail(l,c);
/* Are we already loading the key from disk? If not create a job */
- if (de == NULL)
- cacheScheduleIO(c->db,key,REDIS_IO_LOAD);
- return 1;
-}
-
-/* Preload keys for any command with first, last and step values for
- * the command keys prototype, as defined in the command table. */
-void waitForMultipleSwappedKeys(redisClient *c, struct redisCommand *cmd, int argc, robj **argv) {
- int j, last;
- if (cmd->vm_firstkey == 0) return;
- last = cmd->vm_lastkey;
- if (last < 0) last = argc+last;
- for (j = cmd->vm_firstkey; j <= last; j += cmd->vm_keystep) {
- redisAssert(j < argc);
- waitForSwappedKey(c,argv[j]);
- }
-}
-
-/* Preload keys needed for the ZUNIONSTORE and ZINTERSTORE commands.
- * Note that the number of keys to preload is user-defined, so we need to
- * apply a sanity check against argc. */
-void zunionInterBlockClientOnSwappedKeys(redisClient *c, struct redisCommand *cmd, int argc, robj **argv) {
- int i, num;
- REDIS_NOTUSED(cmd);
-
- num = atoi(argv[2]->ptr);
- if (num > (argc-3)) return;
- for (i = 0; i < num; i++) {
- waitForSwappedKey(c,argv[3+i]);
- }
-}
-
-/* Preload keys needed to execute the entire MULTI/EXEC block.
- *
- * This function is called by blockClientOnSwappedKeys when EXEC is issued,
- * and will block the client when any command requires a swapped out value. */
-void execBlockClientOnSwappedKeys(redisClient *c, struct redisCommand *cmd, int argc, robj **argv) {
- int i, margc;
- struct redisCommand *mcmd;
- robj **margv;
- REDIS_NOTUSED(cmd);
- REDIS_NOTUSED(argc);
- REDIS_NOTUSED(argv);
-
- if (!(c->flags & REDIS_MULTI)) return;
- for (i = 0; i < c->mstate.count; i++) {
- mcmd = c->mstate.commands[i].cmd;
- margc = c->mstate.commands[i].argc;
- margv = c->mstate.commands[i].argv;
-
- if (mcmd->vm_preload_proc != NULL) {
- mcmd->vm_preload_proc(c,mcmd,margc,margv);
- } else {
- waitForMultipleSwappedKeys(c,mcmd,margc,margv);
- }
+ if (de == NULL) {
+ int flags = cacheScheduleIOGetFlags(c->db,key);
+
+ /* It is possible that even if there are no clients waiting for
+ * a load operation, still we have a load operation in progress.
+ * For instance think to a client performing a GET and then
+ * closing the connection */
+ if ((flags & (REDIS_IO_LOAD|REDIS_IO_LOADINPROG)) == 0)
+ cacheScheduleIO(c->db,key,REDIS_IO_LOAD);
}
+ return 1;
}
/* Is this client attempting to run a command against swapped keys?
* Return 1 if the client is marked as blocked, 0 if the client can
* continue as the keys it is going to access appear to be in memory. */
int blockClientOnSwappedKeys(redisClient *c, struct redisCommand *cmd) {
- if (cmd->vm_preload_proc != NULL) {
- cmd->vm_preload_proc(c,cmd,c->argc,c->argv);
+ int *keyindex, numkeys, j, i;
+
+ /* EXEC is a special case, we need to preload all the commands
+ * queued into the transaction */
+ if (cmd->proc == execCommand) {
+ struct redisCommand *mcmd;
+ robj **margv;
+ int margc;
+
+ if (!(c->flags & REDIS_MULTI)) return 0;
+ for (i = 0; i < c->mstate.count; i++) {
+ mcmd = c->mstate.commands[i].cmd;
+ margc = c->mstate.commands[i].argc;
+ margv = c->mstate.commands[i].argv;
+
+ keyindex = getKeysFromCommand(mcmd,margv,margc,&numkeys,
+ REDIS_GETKEYS_PRELOAD);
+ for (j = 0; j < numkeys; j++) {
+ redisLog(REDIS_DEBUG,"Preloading %s",
+ (char*)margv[keyindex[j]]->ptr);
+ waitForSwappedKey(c,margv[keyindex[j]]);
+ }
+ getKeysFreeResult(keyindex);
+ }
} else {
- waitForMultipleSwappedKeys(c,cmd,c->argc,c->argv);
+ keyindex = getKeysFromCommand(cmd,c->argv,c->argc,&numkeys,
+ REDIS_GETKEYS_PRELOAD);
+ for (j = 0; j < numkeys; j++) {
+ redisLog(REDIS_DEBUG,"Preloading %s",
+ (char*)c->argv[keyindex[j]]->ptr);
+ waitForSwappedKey(c,c->argv[keyindex[j]]);
+ }
+ getKeysFreeResult(keyindex);
}
/* If the client was blocked for at least one key, mark it as blocked. */
projects / redis.git / blobdiff