Andi Kleen wrote:
Nick Piggin <[email protected]> writes:
1/14
--
SUSE Labs, Novell Inc.
Slightly optimise some page allocation and freeing functions by
taking advantage of knowing whether or not interrupts are disabled.
Another thing that could optimize that would be to use local_t
for the per zone statistics and the VM statistics (i have an
old patch for the later, needs polishing up for the current
kernel)
With an architecture optimized for it (like i386/x86-64) they
generate much better code.
Yes, all this turning on and off of interrupts does have a
significant cost here.
With the full patchset applied, most of the hot path statistics
get put under areas that already require interrupts to be off,
however there are still a few I didn't get around to doing.
zone_statistics on CONFIG_NUMA, for example.
I wonder if local_t is still good on architectures like ppc64
where it still requires an ll/sc sequence?
Nick
--
SUSE Labs, Novell Inc.
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