On 11/26/2013 2:45 PM, Andrew Morton wrote:
So yes, it would be prudent to be worried about is_vmalloc_addr() performance at the outset. Couldn't is_vmalloc_addr() just be done with a plain old bitmap? It would consume 128kbytes to manage a 4G address space, and 1/8th of a meg isn't much.
Yes, I came to the same conclusion after realizing I needed something similar to fix up proc/kcore.c . I plan to go with the bitmap for the next patch version.
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