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* vm_set_area_protection() would remap the whole area instead of just the page

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it intended to. That resulted in more writable pages where you wouldn't want
  them (ie. allowing the area to change pages in lower caches).
* We were losing modified pages: vm_unmap_pages() sometimes has to preserve
  the modified flag (eg. when called from page fault).
* Both of these were responsible that stealing active pages would crash
  applications - even if less likely, this could also have happened when
  stealing inactive pages. Therefore, I've activated stealing active pages
  again.
* The page writer now pushes the pages of busy vnodes to the end of the queue,
  so that it won't pick them up again too soon (the vnode destruction would
  be in the process of writing those pages back, anyway).
* The page thief now triggers the page writer to run once it has to steal
  active pages. This might be a bit too aggressive, though.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22495 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler
2007-10-09 11:05:50 +00:00
parent 0d871d3c5f
commit 477c9d1dc0
3 changed files with 45 additions and 12 deletions
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headers/private/kernel/vm.h
+2 -1
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@@ -131,7 +131,8 @@ bool vm_test_map_modification(struct vm_page *page);
int32 vm_test_map_activation(struct vm_page *page, bool *_modified);
void vm_clear_map_flags(struct vm_page *page, uint32 flags);
void vm_remove_all_page_mappings(struct vm_page *page, uint32 *_flags);
status_t vm_unmap_pages(struct vm_area *area, addr_t base, size_t length);
status_t vm_unmap_pages(struct vm_area *area, addr_t base, size_t length,
bool preserveModified);
status_t vm_map_page(struct vm_area *area, struct vm_page *page, addr_t address,
uint32 protection);
status_t vm_get_physical_page(addr_t paddr, addr_t *vaddr, uint32 flags);