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support for blocking VM in config file

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antirez 2010-01-12 15:23:52 -05:00
parent f2d9f50f6c
commit 72e9fd40b6
3 changed files with 19 additions and 10 deletions
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1
TODO
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@ -16,6 +16,7 @@ Virtual Memory sub-TODO:
* Divide swappability of objects by refcount * Divide swappability of objects by refcount
* vm-swap-file <filename>. The swap file should go where the user wants, and if it's already there and of the right size we can avoid to create it again. * vm-swap-file <filename>. The swap file should go where the user wants, and if it's already there and of the right size we can avoid to create it again.
* it should be possible to give the vm-max-memory option in megabyte, gigabyte, ..., just using 2GB, 100MB, and so forth. * it should be possible to give the vm-max-memory option in megabyte, gigabyte, ..., just using 2GB, 100MB, and so forth.
* Make sure to wait all the IO threads are done before to fork() for BGSAVE and BGREWRITEAOF
VERSION 1.6 TODO (Virtual memory) VERSION 1.6 TODO (Virtual memory)
================================= =================================

25
redis.c
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@ -1262,18 +1262,23 @@ static int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientD
while (server.vm_enabled && zmalloc_used_memory() > while (server.vm_enabled && zmalloc_used_memory() >
server.vm_max_memory) server.vm_max_memory)
{ {
int retval;
if (tryFreeOneObjectFromFreelist() == REDIS_OK) continue; if (tryFreeOneObjectFromFreelist() == REDIS_OK) continue;
if (vmSwapOneObjectThreaded() == REDIS_ERR) { retval = (server.vm_max_threads == 0) ?
if ((loops % 30) == 0 && zmalloc_used_memory() > vmSwapOneObjectBlocking() :
(server.vm_max_memory+server.vm_max_memory/10)) { vmSwapOneObjectThreaded();
redisLog(REDIS_WARNING,"WARNING: vm-max-memory limit exceeded by more than 10%% but unable to swap more objects out!"); if (retval == REDIS_ERR && (loops % 30) == 0 &&
} zmalloc_used_memory() >
(server.vm_max_memory+server.vm_max_memory/10))
{
redisLog(REDIS_WARNING,"WARNING: vm-max-memory limit exceeded by more than 10%% but unable to swap more objects out!");
} }
/* Note that we freed just one object, because anyway when /* Note that when using threade I/O we free just one object,
* the I/O thread in charge to swap this object out will * because anyway when the I/O thread in charge to swap this
* do its work, the handler of completed jobs will try to swap * object out will finish, the handler of completed jobs
* more objects if we are out of memory. */ * will try to swap more objects if we are still out of memory. */
break; if (retval == REDIS_ERR || server.vm_max_threads > 0) break;
} }
} }

3
redis.conf
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@ -222,6 +222,9 @@ vm-pages 104857600
# number of threads can help with big objects even if they can't help with # number of threads can help with big objects even if they can't help with
# I/O itself as the physical device may not be able to couple with many # I/O itself as the physical device may not be able to couple with many
# reads/writes operations at the same time. # reads/writes operations at the same time.
#
# The special value of 0 turn off threaded I/O and enables the blocking
# Virtual Memory implementation.
vm-max-threads 4 vm-max-threads 4
############################### ADVANCED CONFIG ############################### ############################### ADVANCED CONFIG ###############################