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Re: [PATCH][RFC] Allow explicit shrinking of arena heaps using anenvironment variable
On Mon, 30 Jul 2012 11:30:44 -0400, KOSAKI wrote:
> ... but, I don't understand the benefit of this proposal. nowadays,
> security paranoia always do zero clear before calling free for
> sensitive data. Can anyone please tell me which programs get a benefit
> from this change?
The original intent of the feature was to see utilization in arena maps
similar to one would see in a heap; shrinking and growing of the 'heap'
visible to the user via the /proc/maps of the process. That has turned
into a discussion of whether there is any real performance difference
between the mmap(MAP_FIXED) and the MADV_DONTNEED to warrant the
conditional. I am supposed to write some tests to benchmark this, but I
haven't gotten to doing it yet.
Regards,
Siddhesh