Re: [patch] Re: [perf] Finding uninstalled modules Was Re: mailing list for trace users

[Mike Galbraith <efault@gmx.de>]

On Wed, 2009-09-23 at 13:32 +0200, Mike Galbraith wrote:
> On Wed, 2009-09-23 at 12:55 +0300, Avi Kivity wrote:
> > On 09/23/2009 12:20 PM, Mike Galbraith wrote:
> > >
> > > Yup, brown baggie variety.  Oh darn.
> > >
> > > perf_counter tools: fix brown baggie module symbol loading bug.
> > >
> > > If there are no modules currently loaded, or the last module scanned is not
> > > loaded, dso__load_modules() steps on the value from dso__load_vmlinux(), so
> > > we happily load the kallsyms symbols on top of what we've already loaded.
> > >
> > > Fix that such that the total count of symbols loaded is returned.  Should
> > > module symbol load fail after parsing of vmlinux, is's a hard failure, so
> > > do not silently fall-back to kallsyms.
> > >
> > >    
> > 
> > Still fails, but differently.  Now 'annotate -k ... -m -v -v' doesn't 
> > list vmx_vcpu_run at all, even though it's prominent in 'perf top'.
> 
> Hm.  I just did a record, then report with and without -k -m, and now
> get identical reports with your config (plus some more modules) here.

With your config, I can't even get my e1000 flood pinging friztbox to
show up in perf top without a 70 line monitor.   Mondo overhead.

------------------------------------------------------------------------------
   PerfTop:    3860 irqs/sec  kernel:94.0% [10000Hz instructions],  (all, cpu: 0)
------------------------------------------------------------------------------

             samples    pcnt   kernel function
             _______   _____   _______________

             1702.00 -  5.5% : _spin_lock_irqsave
             1659.00 -  5.3% : add_preempt_count
             1516.00 -  4.9% : sub_preempt_count
             1330.00 -  4.3% : _spin_unlock_irqrestore
             1132.00 -  3.6% : debug_smp_processor_id
              844.00 -  2.7% : find_busiest_group
              639.00 -  2.1% : schedule
              629.00 -  2.0% : get_parent_ip
              586.00 -  1.9% : test_ti_thread_flag
.....

              310.00 -  0.3% : sys_recvmsg
              303.00 -  0.3% : e1000_clean_rx_irq       [e1000e]
              302.00 -  0.3% : raw_sendmsg
              300.00 -  0.3% : e1000_xmit_frame [e1000e]