Linus Torvalds wrote:
On Sat, 13 Jun 2009, Linus Torvalds wrote:
On Sat, 13 Jun 2009, Paul Mackerras wrote:
Linus, Andrew: OK if this goes in via the powerpc tree?
Ok by me.
Btw, do 32-bit architectures really necessarily want 64-bit performance
counters?
I realize that 32-bit counters will overflow pretty easily, but I do
wonder about the performance impact of doing things like hashed spinlocks
for 64-bit counters. Maybe the downsides of 64-bit perf counters on such
architectures might outweight the upsides?
An alternative implementation using 64-bit cmpxchg will recover most of
the costs of hashed spinlocks. I assume most serious 32-bit
architectures have them?
--
error compiling committee.c: too many arguments to function
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