#systemtap on 2015-12-18 — irc logs at freenode.irclog.whitequark.org

2015-11-12 23:18 fche changed the topic of #systemtap to: http://sourceware.org/systemtap; email systemtap@sourceware.org if answers here not timely, conversations may be logged

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03:46 <Mariangel> Hola

03:48 <Mariangel> :-D

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07:06 <wyang> hi guys, I found that some tracepoints are missed on fedora 21, bug?

07:06 <wyang> wyang@easystack-pc ~/w/s/qemu_systemtap> sudo stap -l 'kernel.trace("kvm*")'

07:06 <wyang> kernel.trace("kvm:kvm_ack_irq")

07:06 <wyang> kernel.trace("kvm:kvm_age_page")

07:06 <wyang> kernel.trace("kvm:kvm_async_pf_completed")

07:06 <wyang> kernel.trace("kvm:kvm_async_pf_doublefault")

07:06 <wyang> kernel.trace("kvm:kvm_async_pf_not_present")

07:07 <wyang> kernel.trace("kvm:kvm_async_pf_ready")

07:07 <wyang> kernel.trace("kvm:kvm_fpu")

07:07 <wyang> kernel.trace("kvm:kvm_ioapic_set_irq")

07:07 <wyang> kernel.trace("kvm:kvm_mmio")

07:07 <wyang> kernel.trace("kvm:kvm_msi_set_irq")

07:07 <wyang> kernel.trace("kvm:kvm_set_irq")

07:07 <wyang> kernel.trace("kvm:kvm_try_async_get_page")

07:07 <wyang> kernel.trace("kvm:kvm_userspace_exit")

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07:08 <wyang> Any suggestion on it?

07:09 <wyang> I CAN find more kvm tracepoints in /sys/kernel/debug/tracing/available_event file

07:17 <wyang> ?

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12:31 <fche> wyang, stap uses a different method to enumerate tracepoints than the /sys/kernel file

12:32 <fche> is you think some are missing, please send their names, and a stap --vp 05 -l 'kernel.trace("kvm*")' output to the mailing list

12:32 <wyang> fche, thanks for your reply it, its my fault :-(, I miss kernel-debuginfo package.

12:33 <fche> yeah; tracepoints don't normally require debuginfo

12:33 <fche> -but-

12:33 <fche> some kernel tracepoint header files aren't installed in the proper place, so stap needs to search the kernel source tree (which is in the debuginfo)

12:34 <wyang> kernel source tree is in debuginfo?

12:34 <fche> a copy of it is, yes

12:34 <fche> /usr/src/linux/.... or /usr/src/kernels/...

12:35 <wyang> I always think it should be contained in kernel-devel

12:35 <wyang> I will check it

12:40 <wyang> fche, kernel-debuginfo

12:41 <wyang> it also contains vmlinux/kernel module with debuginfo, and kernel source tree

12:43 <wyang> it means stap always tries to find tracepoint header file in /usr/lib/debug/usr/src/kernels

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