>> (4) Find a fast API for aligned virtual memory allocation. >> (5) Find a fast API for committing / decommitting physical memory without >> releasing virtual memory pages. > > Hrm. Isn't this already available via OSAllocator or are you referring > to the fact that the Posix implementation has a few problems?
OSAllocator is the right model, yes. There are two problems with the current OSAllocator POSIX implementation: (1) It uses mmap, which doesn’t support aligned allocation. To get aligned allocation, POSIX double-allocates all virtual memory. That is 2X too much. So, we need to find a variation on mmap that supports an alignment constraint. (2) POSIX uses MADV_FREE, MADV_DONTNEED, and/or MADV_WILLNEED. I don’t think anybody has ever verified that these APIs do what we want. In my experience, they usually don’t. So, we need to find a variation on these APIs that works and is fast. We need somebody to resolve these issues, otherwise our memory footprint will be unacceptably high, and/or our VM operations will be unacceptably slow. Geoff _______________________________________________ webkit-dev mailing list webkit-dev@lists.webkit.org https://lists.webkit.org/mailman/listinfo/webkit-dev
