Messages in this thread Patch in this message | | | Date | Tue, 15 Jul 2008 14:14:35 -0700 | From | Mike Travis <> | Subject | [PATCH 6/8] cpumask: Optimize cpumask_of_cpu in lib/smp_processor_id.c |
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* Optimize various places where a pointer to the cpumask_of_cpu value will result in reducing stack pressure.
Based on linux-2.6.tip/master at the following commit:
commit 0a91813e16ebd5c2d9b5c2acd5b7c91742112c4f Merge: 9a635fa... 724dce0... Author: Ingo Molnar <mingo@elte.hu> Date: Tue Jul 15 14:55:17 2008 +0200
Signed-off-by: Mike Travis <travis@sgi.com> --- lib/smp_processor_id.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- linux-2.6.tip.orig/lib/smp_processor_id.c +++ linux-2.6.tip/lib/smp_processor_id.c @@ -11,7 +11,7 @@ notrace unsigned int debug_smp_processor { unsigned long preempt_count = preempt_count(); int this_cpu = raw_smp_processor_id(); - cpumask_t this_mask; + cpumask_of_cpu_ptr_declare(this_mask); if (likely(preempt_count)) goto out; @@ -23,9 +23,9 @@ notrace unsigned int debug_smp_processor * Kernel threads bound to a single CPU can safely use * smp_processor_id(): */ - this_mask = cpumask_of_cpu(this_cpu); + cpumask_of_cpu_ptr_next(this_mask, cpu); - if (cpus_equal(current->cpus_allowed, this_mask)) + if (cpus_equal(current->cpus_allowed, *this_mask)) goto out; /* --
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