Peter Chubb wrote: > > As munmap()'s behaviour is undefined on memory that wasn't allocated > with mmap(), rounding to the underlaying true page size should work > for well-behaved programs. > > x = mmap(... 4k ....) > maps a 16k chunk > > munmap(x, 4k) > deallocates a 16k chunk, if page_size is 16k As David said, this has been discussed before. Basically if there were other 4k mappings with a different permission in the same 16k chunk, you can't deallocate the 16k chunk safely. Tracking the sub pages without changes to machine independent code (struct page) is possible, but may be expensive. -Arun - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.htmlReceived on Tue Mar 9 15:34:04 2004
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