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It's now possible to get purgeable memory by using mmap(MAP_PURGEABLE). Purgeable memory has a "volatile" flag that can be set using madvise(): - madvise(..., MADV_SET_VOLATILE) - madvise(..., MADV_SET_NONVOLATILE) When in the "volatile" state, the kernel may take away the underlying physical memory pages at any time, without notifying the owner. This gives you a guilt discount when caching very large things. :^) Setting a purgeable region to non-volatile will return whether or not the memory has been taken away by the kernel while being volatile. Basically, if madvise(..., MADV_SET_NONVOLATILE) returns 1, that means the memory was purged while volatile, and whatever was in that piece of memory needs to be reconstructed before use. |
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| .. | ||
| AnonymousVMObject.cpp | ||
| AnonymousVMObject.h | ||
| InodeVMObject.cpp | ||
| InodeVMObject.h | ||
| MemoryManager.cpp | ||
| MemoryManager.h | ||
| PageDirectory.cpp | ||
| PageDirectory.h | ||
| PhysicalAddress.h | ||
| PhysicalPage.cpp | ||
| PhysicalPage.h | ||
| PhysicalRegion.cpp | ||
| PhysicalRegion.h | ||
| PurgeableVMObject.cpp | ||
| PurgeableVMObject.h | ||
| RangeAllocator.cpp | ||
| RangeAllocator.h | ||
| Region.cpp | ||
| Region.h | ||
| VirtualAddress.h | ||
| VMObject.cpp | ||
| VMObject.h | ||