Messages in this thread | | | Date | Tue, 22 Sep 2009 12:13:04 +0300 | From | Avi Kivity <> | Subject | Re: mailing list for trace users |
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On 09/16/2009 11:16 PM, Steven Rostedt wrote: > What are people's thoughts about creating a linux-trace-users mailing > list on vger.kernel.org? > > This would be a place for users of tracers and even perf. For asking > questions about how to use the debugfs/tracing directory or the perf > tool. > > This will not be a place for kernel development. Patches for the tracing > infrastructure should still go through LKML. This will be a place to ask > how-to questions, or any other kind of help questions. > > LKML can be quite intimidating, and it is not a place to ask help > questions anyway. I think adding a linux-trace-users mailing list would > be a good idea. >
Yes please. Here's a question to start it off - how to I 'perf annotate' a symbol in a module?
$ perf report # Samples: 68202 # # Overhead Command Shared Object Symbol # ........ ............... ............. ...... # 84.17% qemu-system-x86 [kernel] [k] vmx_vcpu_run [kvm_intel] 4.28% qemu-system-x86 [kernel] [k] kvm_arch_vcpu_ioctl_run [kvm] 0.88% qemu-system-x86 [kernel] [k] add_preempt_count 0.75% qemu-system-x86 [kernel] [k] _spin_unlock_irqrestore 0.68% qemu-system-x86 [kernel] [k] _spin_lock_irq
$ perf annotate -k ~avi/kvm/linux-2.6/vmlinux -m vmx_vcpu_run Error: symbol 'vmx_vcpu_run' not present amongst the samples.
builtin symbols work.
-- error compiling committee.c: too many arguments to function
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