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prevent small integer sharing when maxmemory is active. So every object will use a private LRU field and the LRU algorithm can work well

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This commit is contained in:
antirez 2010-10-15 18:04:05 +02:00
parent 9f8ded8ced
commit 13a49af44b
1 changed files with 6 additions and 2 deletions
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8
src/object.c
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@ -245,8 +245,12 @@ robj *tryObjectEncoding(robj *o) {
* range and if this is the main thread, since when VM is enabled we * 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 * 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 * objects, in order to avoid race conditions (we don't have per-object
* locking). */ * locking).
if (value >= 0 && value < REDIS_SHARED_INTEGERS && *
* Note that we also avoid using shared integers when maxmemory is used
* because very object needs to have a private LRU field for the LRU
* algorithm to work well. */
if (server.maxmemory == 0 && value >= 0 && value < REDIS_SHARED_INTEGERS &&
pthread_equal(pthread_self(),server.mainthread)) { pthread_equal(pthread_self(),server.mainthread)) {
decrRefCount(o); decrRefCount(o);
incrRefCount(shared.integers[value]); incrRefCount(shared.integers[value]);