hopefully more readable info_string method in redis-trib

[redis.git] / src / object.c

diff --git a/src/object.c b/src/object.c
index bba448241b0000ef68f15288b233469e6ffe30f7..6a9b0214db024645bfbd0351a6538af41b10d281 100644 (file)
--- a/src/object.c
+++ b/src/object.c
@@ -3,22 +3,12 @@
 #include <math.h>
 
 robj *createObject(int type, void *ptr) {
 #include <math.h>
 
 robj *createObject(int type, void *ptr) {

-    robj *o;
-
-    if (server.vm_enabled) pthread_mutex_lock(&server.obj_freelist_mutex);
-    if (listLength(server.objfreelist)) {
-        listNode *head = listFirst(server.objfreelist);
-        o = listNodeValue(head);
-        listDelNode(server.objfreelist,head);
-        if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
-    } else {
-        if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
-        o = zmalloc(sizeof(*o));
-    }
+    robj *o = zmalloc(sizeof(*o));

     o->type = type;
     o->encoding = REDIS_ENCODING_RAW;
     o->ptr = ptr;
     o->refcount = 1;
     o->type = type;
     o->encoding = REDIS_ENCODING_RAW;
     o->ptr = ptr;
     o->refcount = 1;

+

     /* Set the LRU to the current lruclock (minutes resolution).
      * We do this regardless of the fact VM is active as LRU is also
      * used for the maxmemory directive when Redis is used as cache.
     /* Set the LRU to the current lruclock (minutes resolution).
      * We do this regardless of the fact VM is active as LRU is also
      * used for the maxmemory directive when Redis is used as cache.


@@ -31,7 +21,6 @@ robj *createObject(int type, void *ptr) {
     /* The following is only needed if VM is active, but since the conditional
      * is probably more costly than initializing the field it's better to
      * have every field properly initialized anyway. */
     /* The following is only needed if VM is active, but since the conditional
      * is probably more costly than initializing the field it's better to
      * have every field properly initialized anyway. */

-    o->storage = REDIS_VM_MEMORY;

     return o;
 }
 
     return o;
 }
 


@@ -42,6 +31,7 @@ robj *createStringObject(char *ptr, size_t len) {
 robj *createStringObjectFromLongLong(long long value) {
     robj *o;
     if (value >= 0 && value < REDIS_SHARED_INTEGERS &&
 robj *createStringObjectFromLongLong(long long value) {
     robj *o;
     if (value >= 0 && value < REDIS_SHARED_INTEGERS &&

+        !server.ds_enabled &&

         pthread_equal(pthread_self(),server.mainthread)) {
         incrRefCount(shared.integers[value]);
         o = shared.integers[value];
         pthread_equal(pthread_self(),server.mainthread)) {
         incrRefCount(shared.integers[value]);
         o = shared.integers[value];


@@ -103,10 +93,13 @@ robj *createHashObject(void) {
 
 robj *createZsetObject(void) {
     zset *zs = zmalloc(sizeof(*zs));
 
 robj *createZsetObject(void) {
     zset *zs = zmalloc(sizeof(*zs));

+    robj *o;

 
     zs->dict = dictCreate(&zsetDictType,NULL);
     zs->zsl = zslCreate();
 
     zs->dict = dictCreate(&zsetDictType,NULL);
     zs->zsl = zslCreate();

-    return createObject(REDIS_ZSET,zs);
+    o = createObject(REDIS_ZSET,zs);
+    o->encoding = REDIS_ENCODING_SKIPLIST;
+    return o;

 }
 
 void freeStringObject(robj *o) {
 }
 
 void freeStringObject(robj *o) {


@@ -170,30 +163,7 @@ void incrRefCount(robj *o) {
 void decrRefCount(void *obj) {
     robj *o = obj;
 
 void decrRefCount(void *obj) {
     robj *o = obj;
 

-    /* Object is a swapped out value, or in the process of being loaded. */
-    if (server.vm_enabled &&
-        (o->storage == REDIS_VM_SWAPPED || o->storage == REDIS_VM_LOADING))
-    {
-        vmpointer *vp = obj;
-        if (o->storage == REDIS_VM_LOADING) vmCancelThreadedIOJob(o);
-        vmMarkPagesFree(vp->page,vp->usedpages);
-        server.vm_stats_swapped_objects--;
-        zfree(vp);
-        return;
-    }
-

     if (o->refcount <= 0) redisPanic("decrRefCount against refcount <= 0");
     if (o->refcount <= 0) redisPanic("decrRefCount against refcount <= 0");

-    /* Object is in memory, or in the process of being swapped out.
-     *
-     * If the object is being swapped out, abort the operation on
-     * decrRefCount even if the refcount does not drop to 0: the object
-     * is referenced at least two times, as value of the key AND as
-     * job->val in the iojob. So if we don't invalidate the iojob, when it is
-     * done but the relevant key was removed in the meantime, the
-     * complete jobs handler will not find the key about the job and the
-     * assert will fail. */
-    if (server.vm_enabled && o->storage == REDIS_VM_SWAPPING)
-        vmCancelThreadedIOJob(o);

     if (--(o->refcount) == 0) {
         switch(o->type) {
         case REDIS_STRING: freeStringObject(o); break;
     if (--(o->refcount) == 0) {
         switch(o->type) {
         case REDIS_STRING: freeStringObject(o); break;


@@ -204,11 +174,7 @@ void decrRefCount(void *obj) {
         default: redisPanic("Unknown object type"); break;
         }
         o->ptr = NULL; /* defensive programming. We'll see NULL in traces. */
         default: redisPanic("Unknown object type"); break;
         }
         o->ptr = NULL; /* defensive programming. We'll see NULL in traces. */

-        if (server.vm_enabled) pthread_mutex_lock(&server.obj_freelist_mutex);
-        if (listLength(server.objfreelist) > REDIS_OBJFREELIST_MAX ||
-            !listAddNodeHead(server.objfreelist,o))
-            zfree(o);
-        if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
+        zfree(o);

     }
 }
 
     }
 }
 


@@ -242,12 +208,16 @@ robj *tryObjectEncoding(robj *o) {
     /* Ok, this object can be encoded...
      *
      * Can I use a shared object? Only if the object is inside a given
     /* Ok, this object can be encoded...
      *
      * Can I use a shared object? Only if the object is inside a given

-     * range and if this is the main thread, since when VM is enabled we
-     * have the constraint that I/O thread should only handle non-shared
-     * objects, in order to avoid race conditions (we don't have per-object
-     * locking). */
-    if (value >= 0 && value < REDIS_SHARED_INTEGERS &&
-        pthread_equal(pthread_self(),server.mainthread)) {
+     * range and if the back end in use is in-memory. For disk store every
+     * object in memory used as value should be independent.
+     *
+     * Note that we also avoid using shared integers when maxmemory is used
+     * because every object needs to have a private LRU field for the LRU
+     * algorithm to work well. */
+    if (!server.ds_enabled &&
+        server.maxmemory == 0 && value >= 0 && value < REDIS_SHARED_INTEGERS &&
+        pthread_equal(pthread_self(),server.mainthread))
+    {

         decrRefCount(o);
         incrRefCount(shared.integers[value]);
         return shared.integers[value];
         decrRefCount(o);
         incrRefCount(shared.integers[value]);
         return shared.integers[value];


@@ -435,6 +405,7 @@ char *strEncoding(int encoding) {
     case REDIS_ENCODING_LINKEDLIST: return "linkedlist";
     case REDIS_ENCODING_ZIPLIST: return "ziplist";
     case REDIS_ENCODING_INTSET: return "intset";
     case REDIS_ENCODING_LINKEDLIST: return "linkedlist";
     case REDIS_ENCODING_ZIPLIST: return "ziplist";
     case REDIS_ENCODING_INTSET: return "intset";

+    case REDIS_ENCODING_SKIPLIST: return "skiplist";

     default: return "unknown";
     }
 }
     default: return "unknown";
     }
 }


@@ -449,3 +420,42 @@ unsigned long estimateObjectIdleTime(robj *o) {
                     REDIS_LRU_CLOCK_RESOLUTION;
     }
 }
                     REDIS_LRU_CLOCK_RESOLUTION;
     }
 }

+
+/* This is an helper function for the DEBUG command. We need to lookup keys
+ * without any modification of LRU or other parameters. */
+robj *objectCommandLookup(redisClient *c, robj *key) {
+    dictEntry *de;
+
+    if ((de = dictFind(c->db->dict,key->ptr)) == NULL) return NULL;
+    return (robj*) dictGetEntryVal(de);
+}
+
+robj *objectCommandLookupOrReply(redisClient *c, robj *key, robj *reply) {
+    robj *o = objectCommandLookup(c,key);
+
+    if (!o) addReply(c, reply);
+    return o;
+}
+
+/* Object command allows to inspect the internals of an Redis Object.
+ * Usage: OBJECT <verb> ... arguments ... */
+void objectCommand(redisClient *c) {
+    robj *o;
+
+    if (!strcasecmp(c->argv[1]->ptr,"refcount") && c->argc == 3) {
+        if ((o = objectCommandLookupOrReply(c,c->argv[2],shared.nullbulk))
+                == NULL) return;
+        addReplyLongLong(c,o->refcount);
+    } else if (!strcasecmp(c->argv[1]->ptr,"encoding") && c->argc == 3) {
+        if ((o = objectCommandLookupOrReply(c,c->argv[2],shared.nullbulk))
+                == NULL) return;
+        addReplyBulkCString(c,strEncoding(o->encoding));
+    } else if (!strcasecmp(c->argv[1]->ptr,"idletime") && c->argc == 3) {
+        if ((o = objectCommandLookupOrReply(c,c->argv[2],shared.nullbulk))
+                == NULL) return;
+        addReplyLongLong(c,estimateObjectIdleTime(o));
+    } else {
+        addReplyError(c,"Syntax error. Try OBJECT (refcount|encoding|idletime)");
+    }
+}
+