Hey,
currently WebKit supports usage either of system-malloc or TCmalloc. It
depends on your platform whether USE_SYSTEM_MALLOC macro is defined to 1
or not.
By default WebKit builds with TCmalloc, but you can pass --system-malloc
option to build-webkit and it will set the macro for you to 1.
FastMalloc is only a wrapper, but you can find TCmalloc's implementation
in FastMalloc.cpp.
Cheers,
<Zoltan>
On Wed, 28 Mar 2012 01:50:24 +0200, Fabrice Robinet <[email protected]>
wrote:
Hi group,
In short: I wonder where tryFastMalloc should be used, and what's
*really*
implemented in it (or should be).
Longer story:
According to the .cpp, it is supposed to use a cache, which would justify
the "fast" in the function name.
From FastMalloc.cpp
// A malloc that uses a per-thread cache to satisfy small malloc
requests.
// (The time for malloc/free of a small object drops from 300 ns to 50
ns.)
But looking at the current source tryFastMalloc looks to just wrap
malloc. (I just updated Chromium and thus WebCore too...),
I have seen tryFastMalloc used in WebCore code that is not too old (like
WebGL),
so I believe it is not deprecated and *should* be used, so this raises a
couple of questions:
Is current state of tryFastMalloc temporary in the sense that a cache
will
be used eventually ?
Did I miss something about this cache in the implementation ?
Are there (updated) guidelines about the usage of tryFastMalloc ?
Thanks,
Fabrice.
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