On Oct 10, 2011, at 4:46 AM, Xianzhu Wang (王显著) wrote:
> malloc_good_size() can get the rounded-up size of a required size, but it
> seems not available on all platforms. It's easy to implementation it over
> tcmalloc. On platforms that malloc_good_size() is not available, it's
> possible to get the mapping with a program and then hardcode the rules in
> WebKit, but I'm afraid if the rules could match the actual running
> environment. Any ideas?
I think the key is to actually predict and measure the benefits of the change,
ideally with real use cases.
At one point I experimented with using this for string buffers expecting it to
make code use less memory and be faster but when I did it I could not measure
the benefit I expected.
I think we can start by just not doing the tuning at all on platforms without a
malloc_good_size and then dig deeper if we have a specific example of a
problematic platform.
-- Darin
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