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sched, x86: Optimize branch hint in __switch_to()
Branch hint profiling on my nehalem machine showed 96% incorrect branch hints: 6548732 174664120 96 __switch_to process_64.c 406 6548745 174565593 96 __switch_to process_64.c 410 Signed-off-by: Tim Blechmann <tim@klingt.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4B0BBB93.3080307@klingt.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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1 changed files with 2 additions and 3 deletions
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@ -406,11 +406,10 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
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* This won't pick up thread selector changes, but I guess that is ok.
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*/
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savesegment(es, prev->es);
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if (unlikely(next->es | prev->es))
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if (next->es | prev->es)
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loadsegment(es, next->es);
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savesegment(ds, prev->ds);
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if (unlikely(next->ds | prev->ds))
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if (next->ds | prev->ds)
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loadsegment(ds, next->ds);
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