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Ingo and I fixed a couple of VM bugs in a late night debugging session:

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* vm_copy_on_write_area() now does no longer overwrite the ref_count, but keeps
  it's reference to the cache until it has unlocked it.
* It now also locks its reference from the start, preventing any other thread
  to interfere.
* vm_cache_remove_consumer() now detects if it has to remove a foreign busy
  page itself in order to preserve a mapped page.
* vm_soft_fault() now keeps a reference to the cache that owns the page to be
  mapped until it has actually mapped it.
* vm_unmap_pages() removed the mappings of all pages of the area instead of only
  those that are within the requested range.
* Kept (disabled) debug output for convenience.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21482 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler
2007-06-21 13:57:46 +00:00
parent 8491616029
commit 0cb94db539
3 changed files with 85 additions and 46 deletions
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headers/private/kernel/vm_cache.h
+1 -1
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@@ -21,7 +21,7 @@ extern "C" {
status_t vm_cache_init(struct kernel_args *args);
vm_cache *vm_cache_create(vm_store *store);
status_t vm_cache_ref_create(vm_cache *cache);
status_t vm_cache_ref_create(vm_cache *cache, bool acquireLock);
void vm_cache_acquire_ref(vm_cache_ref *cache_ref);
void vm_cache_release_ref(vm_cache_ref *cache_ref);
vm_page *vm_cache_lookup_page(vm_cache_ref *cacheRef, off_t page);