Date: Tue, 2 Apr 2002 13:26:46 -0800 From: Alfred Perlstein <bright@mu.org> To: hackers@freebsd.org Cc: dillon@freebsd.org, jeffr@freebsd.org Subject: mpsafe malloc Message-ID: <20020402212646.GV93885@elvis.mu.org>
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Started looking at making malloc mpsafe.
First issue I came across was this brokenish code in
uma_core.c:page_alloc():
if (lockstatus(&kernel_map->lock, NULL)) {
*pflag = UMA_SLAB_KMEM;
p = (void *) kmem_malloc(kmem_map, bytes, wait);
} else {
*pflag = UMA_SLAB_KMAP;
p = (void *) kmem_alloc(kernel_map, bytes);
}
using lockstatus won't work for smp.
I think a solution is to do a trylock on the kmem_map, then have
kmem_malloc either recurse on the lock, or take a flag to tell it
not to bother locking.
?
--
-Alfred Perlstein [alfred@freebsd.org]
'Instead of asking why a piece of software is using "1970s technology,"
start asking why software is ignoring 30 years of accumulated wisdom.'
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