Messages in this thread | | | Date | Thu, 15 Jan 2015 21:57:58 -0600 (CST) | From | Christoph Lameter <> | Subject | Re: [PATCH v2 1/2] mm/slub: optimize alloc/free fastpath by removing preemption on/off |
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> 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.
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