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Introduced vm_page_try_reserve_pages(), which fails when not enough

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pages are free ATM.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27116 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2008-08-21 22:43:52 +00:00
parent cc57c65424
commit 2e8e6c9c6e
2 changed files with 20 additions and 0 deletions
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1
headers/private/kernel/vm_page.h
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@ -46,6 +46,7 @@ void vm_page_schedule_write_page_range(struct VMCache *cache,
void vm_page_unreserve_pages(uint32 count); void vm_page_unreserve_pages(uint32 count);
void vm_page_reserve_pages(uint32 count); void vm_page_reserve_pages(uint32 count);
bool vm_page_try_reserve_pages(uint32 count);
struct vm_page *vm_page_allocate_page(int pageState, bool reserved); struct vm_page *vm_page_allocate_page(int pageState, bool reserved);
status_t vm_page_allocate_pages(int pageState, struct vm_page **pages, status_t vm_page_allocate_pages(int pageState, struct vm_page **pages,

19
src/system/kernel/vm/vm_page.cpp
View File

@ -1756,6 +1756,25 @@ vm_page_reserve_pages(uint32 count)
} }
bool
vm_page_try_reserve_pages(uint32 count)
{
if (count == 0)
return true;
InterruptsSpinLocker locker(sPageLock);
T(ReservePages(count));
size_t freePages = free_page_queue_count();
if (sReservedPages + count > freePages)
return false;
sReservedPages += count;
return true;
}
vm_page * vm_page *
vm_page_allocate_page(int pageState, bool reserved) vm_page_allocate_page(int pageState, bool reserved)
{ {