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* Avoid calling vm_unreserve_memory() if there is no change in the commited

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size. Removes a bit of overhead (call and mutex_lock / mutex_unlock).
* Don't fail if there is exactly enough memory available to satisfy the
  reserve request. Not that it would really matter as it's rather an edge case...

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26246 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Michael Lotz
2008-07-04 14:49:25 +00:00
parent 45b309e39d
commit af637076ad
2 changed files with 4 additions and 1 deletions
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src/system/kernel/vm/vm.cpp
+1 -1
View File
@@ -4761,7 +4761,7 @@ vm_try_reserve_memory(size_t amount)
//dprintf("try to reserve %lu bytes, %Lu left\n", amount, sAvailableMemory); //dprintf("try to reserve %lu bytes, %Lu left\n", amount, sAvailableMemory);
if (sAvailableMemory > amount) { if (sAvailableMemory >= amount) {
sAvailableMemory -= amount; sAvailableMemory -= amount;
status = B_OK; status = B_OK;
} else } else
src/system/kernel/vm/vm_store_anonymous_noswap.cpp
+3
View File
@@ -66,6 +66,9 @@ anonymous_commit(struct vm_store *_store, off_t size)
size = precommitted; size = precommitted;
} }
if (size == store->vm.committed_size)
return B_OK;
// Check to see how much we could commit - we need real memory // Check to see how much we could commit - we need real memory
if (size > store->vm.committed_size) { if (size > store->vm.committed_size) {