Re: [PATCH -mm 2/2] mm: do not reset mm->free_area_cache on every single munmap

On 02/23/2012 04:57 PM, Andi Kleen wrote:

Rik van Riel[off-list ref]  writes:

quoted

Some programs have a large number of VMAs, and make frequent calls
to mmap and munmap. Having munmap constantly cause the search
pointer for get_unmapped_area to get reset can cause a significant
slowdown for such programs.

This would be a much nicer patch if you split it into one that merges
all the copy'n'paste code and another one that actually implements
the new algorithm.

The copy'n'pasted functions are not quite the same, though.

All the ones that could be unified already have been, leaving
a few functions with actual differences around.

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