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and pages are now kept in lists as well. This allows to return free pages once a bin does not need them anymore. Partially filled pages are kept in a sorted linked list so that allocation will always happen on the fullest page - this favours having full pages and makes it more likely lightly used pages will get completely empty so they can be returned. Generally this now goes more in the direction of a slab allocator. The allocation logic has been extracted, so a heap is now simply attachable to a region of memory. This allows for multiple heaps and for dynamic growing. In case the allocator runs out of free pages, an asynchronous growing thread is notified to create a new area and attach a new heap to it. By default the kernel heap is now set to 16MB and grows by 8MB each time all heaps run full. This should solve quite a few issues, like certain bins just claiming all pages so that even if there is free space nothing can be allocated. Also it obviously does aways with filling the heap page by page until it overgrows. I think this is now a well performing and scalable allocator we can live with for quite some time. It is well tested under emulation and real hardware and performs as expected. If problems come up there is an extensive sanity checker that can be enabled by PARANOID_VALIDATION that covers most aspects of the allocator. For normal operation this is not necessary though and is therefore disabled by default. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23939 a95241bf-73f2-0310-859d-f6bbb57e9c96 |
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