Messages in this thread | | | Date | Thu, 15 Jan 2015 23:07:49 -0500 | From | Steven Rostedt <> | Subject | Re: [PATCH v2 1/2] mm/slub: optimize alloc/free fastpath by removing preemption on/off |
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On Thu, 15 Jan 2015 21:57:58 -0600 (CST) Christoph Lameter <cl@linux.com> wrote:
> > I get: > > > > mov %gs:0x18(%rax),%rdx > > > > Looks to me that %gs is used. > > %gs is used as a segment prefix. That does not add significant cycles. > Retrieving the content of %gs and loading it into another register > would be expensive in terms of cpu cycles.
OK, maybe that's what I saw in my previous benchmarks. Again, that was a while ago.
-- Steve
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