[Sugar-devel] poor man's mmap "sliding window" on Python 2.5.x

Benjamin M. Schwartz bmschwar at fas.harvard.edu
Mon Jul 6 17:16:48 EDT 2009

Martin Langhoff wrote:
> On Tue, Jul 7, 2009 at 2:06 AM, Benjamin M.
> Schwartz<bmschwar at fas.harvard.edu> wrote:
>> Is this (a) a kernel bug, (b) Python layering extra caching over mmap, or
>> (c) a misunderstanding of mmap on my part?
> money is b

huh.  I looked through python's mmap implementation [1] and there doesn't
seem to be any caching or funny business going on.

I wonder if it could be over-aggressive caching somewhere in jffs2, in an
attempt to avoid repeatedly decompressing the same block.


[1] http://svn.python.org/projects/python/trunk/Modules/mmapmodule.c

P.S. JFFS2 appears to support read-only mmap, which I presume is what
you're using.

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