[linux-mm-cc] compcache with swap free notify support

John McCabe-Dansted gmatht at gmail.com
Sat Jun 21 03:13:17 EDT 2008

On Mon, Jun 16, 2008 at 4:59 PM, Nitin Gupta <nitingupta910 at gmail.com> wrote:
> Performance numbers (in term of memory saving and performance gain)
> should be much better with this patch than compcache-0.3.

I would have thought that the free space in the vmalloc'd memory would
be too fragmented to be effectively reclaimed under normal conditions,
and so this patch still wouldn't normally result in tlsf releasing
memory back to the system. Is it intended more that if one page is
freed and another is allocated, then the memory used by tlsf does not

It would perhaps be possible to defragment the free space by
heuristically selecting a maximum pointer value M, and scanning the
table for a pointers X  > M and then reallocating X below M. Then all
space higher than M could be released back to the system.

John C. McCabe-Dansted
PhD Student
University of Western Australia

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