Messages in this thread | | | Subject | Re: [patch] latency tracer, 2.6.15-rc7 | From | Lee Revell <> | Date | Thu, 29 Dec 2005 21:16:19 -0500 |
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On Thu, 2005-12-29 at 21:28 +0100, Ingo Molnar wrote: > * Lee Revell <rlrevell@joe-job.com> wrote: > > > > Still does not quite work for me on i386. I applied all the patches as > > > I'm using 4K stacks. > > oops! > > > > LD .tmp_vmlinux1 > > > init/built-in.o: In function `start_kernel': > > > : undefined reference to `preempt_max_latency' > > > make: *** [.tmp_vmlinux1] Error 1 > > > > > > > This patch fixes the problem. > > thanks, applied - new version uploaded.
It seems that debug_smp_processor_id is being called a lot, even though I have a UP config, which I didn't see with the -rt kernel:
$ grep debug_smp_processor_id /proc/latency_trace | head -20 evolutio-4568 0d.H1 3us : debug_smp_processor_id (do_IRQ) evolutio-4568 0d.h. 25us : debug_smp_processor_id (netif_rx) evolutio-4568 0d.h. 28us : debug_smp_processor_id (kmem_cache_alloc) evolutio-4568 0d.h. 31us+: debug_smp_processor_id (__kmalloc) evolutio-4568 0d.s. 46us : debug_smp_processor_id (__do_softirq) evolutio-4568 0d.s. 47us : debug_smp_processor_id (__do_softirq) evolutio-4568 0d.s1 54us+: debug_smp_processor_id (kmem_cache_alloc) evolutio-4568 0d.s1 65us : debug_smp_processor_id (kmem_cache_free) evolutio-4568 0d.s3 109us : debug_smp_processor_id (kmem_cache_alloc) evolutio-4568 0d.s3 111us+: debug_smp_processor_id (__kmalloc) evolutio-4568 0d.s3 140us : debug_smp_processor_id (kfree) evolutio-4568 0d.s3 141us : debug_smp_processor_id (kmem_cache_free) evolutio-4568 0d.s3 158us : debug_smp_processor_id (kfree) evolutio-4568 0d.s3 160us : debug_smp_processor_id (kmem_cache_free) evolutio-4568 0d.s3 192us : debug_smp_processor_id (kfree) evolutio-4568 0d.s3 193us : debug_smp_processor_id (kmem_cache_free) evolutio-4568 0d.s3 210us : debug_smp_processor_id (kfree) evolutio-4568 0d.s3 211us : debug_smp_processor_id (kmem_cache_free) evolutio-4568 0d.s3 216us : debug_smp_processor_id (kmem_cache_alloc) evolutio-4568 0d.s3 217us+: debug_smp_processor_id (__kmalloc)
etc.
Was this optimized out on UP before?
Lee
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