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* Decoupled block_cache_used_memory() from the sCachesLock - this should fix the

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UI freezes (ActivityMonitor and ProcessController both use get_system_info() a
  lot), although this is only the symptom of another problem.
* The downside is that the block cache usage information isn't as up to date as
  it was previously - it's updated by the block write/notifier thread now (worst
  case every 2 seconds).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31812 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler 2009-07-27 14:59:39 +00:00
parent 5efec82035
commit eb26e782f3
1 changed files with 16 additions and 17 deletions
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33
src/system/kernel/cache/block_cache.cpp vendored
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@ -552,8 +552,12 @@ static status_t write_cached_block(block_cache* cache, cached_block* block,
static DoublyLinkedList<block_cache> sCaches;
static mutex sCachesLock = MUTEX_INITIALIZER("block caches");
static mutex sCachesMemoryUseLock
= MUTEX_INITIALIZER("block caches memory use");
static size_t sUsedMemory;
static sem_id sEventSemaphore;
static mutex sNotificationsLock = MUTEX_INITIALIZER("block cache notifications");
static mutex sNotificationsLock
= MUTEX_INITIALIZER("block cache notifications");
static thread_id sNotifierWriterThread;
static DoublyLinkedListLink<block_cache> sMarkCache;
// TODO: this only works if the link is the first entry of block_cache
@ -1916,6 +1920,7 @@ block_notifier_and_writer(void* /*data*/)
// write 64 blocks of each block_cache every two seconds
// TODO: change this once we have an I/O scheduler
timeout = kTimeout;
size_t usedMemory = 0;
block_cache* cache = NULL;
while ((cache = get_next_locked_block_cache(cache)) != NULL) {
@ -1923,6 +1928,10 @@ block_notifier_and_writer(void* /*data*/)
cached_block* blocks[kMaxCount];
uint32 count = 0;
size_t cacheUsedMemory;
object_cache_get_usage(cache->buffer_cache, &cacheUsedMemory);
usedMemory += cacheUsedMemory;
if (cache->num_dirty_blocks) {
// This cache is not using transactions, we'll scan the blocks
// directly
@ -1976,6 +1985,9 @@ block_notifier_and_writer(void* /*data*/)
break;
}
}
MutexLocker _(sCachesMemoryUseLock);
sUsedMemory = usedMemory;
}
// never can get here
@ -2098,23 +2110,10 @@ block_cache_init(void)
size_t
block_cache_used_memory()
block_cache_used_memory(void)
{
size_t usedMemory = 0;
MutexLocker _(sCachesLock);
DoublyLinkedList<block_cache>::Iterator it = sCaches.GetIterator();
while (block_cache* cache = it.Next()) {
if (cache == (block_cache*)&sMarkCache)
continue;
size_t cacheUsedMemory;
object_cache_get_usage(cache->buffer_cache, &cacheUsedMemory);
usedMemory += cacheUsedMemory;
}
return usedMemory;
MutexLocker _(sCachesMemoryUseLock);
return sUsedMemory;
}