malloc vs ptmalloc2
Brian Fundakowski Feldman
green at FreeBSD.ORG
Tue Feb 15 20:11:58 PST 2005
On Mon, Feb 14, 2005 at 02:08:07PM -0800, John-Mark Gurney wrote:
> David Schultz wrote this message on Mon, Feb 14, 2005 at 08:04 -0500:
> > Right, databases, language runtimes, and the small set of other
> > applications for which it really matters usually have their own
> > special-purpose allocators. I was counting on that when I said
> > that replacing malloc() is unlikely to make a big difference.
> > (One could argue, of course, that it's unfortunate that
> > applications need to do so.)
> Hmmm, maybe we should bring the zone API into userland? :) It'd be
> nice to have some of the features, like the ctor/dtor's...
Why not just make UMA the userland implementation, too? It should
only cost us one kernel trap instruction per allocation/deallocation
operation. With fine-grained kernel locking, why we wouldn't want to
trust the same code to both tasks, and possibly optimize more because
it can do that?
Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\
<> green at FreeBSD.org \ The Power to Serve! \
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