perf: Show Potential probe points.
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From: Christoph Hellwig on 8 Jul 2010 16:30 > Show all potential probes in a process by pid 21106 across all dsos > # perf probe -S -p 21106 | tail Again, a file based interface would be much more useful. E.g. what possible probe points do I have in my qemu binary. Btw, this doesn't mean I want to see the PID based variant removed, it can be very useful for debugging long running processes. I just don't think it's the most important / conveniant one. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Srikar Dronamraju on 9 Jul 2010 02:10 > > Show all potential probes in a process by pid 21106 across all dsos > > # perf probe -S -p 21106 | tail > > Again, a file based interface would be much more useful. E.g. what > possible probe points do I have in my qemu binary. Right, Currently perf probe needs -p option because it depend on thread->map_groups for listing the dsos and its functions. I am not sure if perf already has ability to list functions in a file esp if we dont have dwarf information in that file. If perf has the ability I will reuse it here or will try implementing one. Arnaldo, Do you know offhand if perf already has the ability to list functions in a file (with / without dwarf info). > > Btw, this doesn't mean I want to see the PID based variant removed, it > can be very useful for debugging long running processes. I just don't > think it's the most important / conveniant one. Agree. -- Thanks and Regards Srikar -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Srikar Dronamraju on 9 Jul 2010 02:20 > > Show all potentail probes in a process by pid 21106 limit to libc.so dso. Actually It should have been Show all potential probes in a process by pid 21106 limit to zsh dso. > # perf probe -S -p 21106 -D zsh | tail > zstrtol > ztrcmp > ztrdup > ztrduppfx > ztrftime > ztrlen > ztrncpy > ztrsub > zwarn > zwarnnam > Sorry for the mismatch. -- Thanks and Regards Srikar -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Ingo Molnar on 9 Jul 2010 03:20
* Srikar Dronamraju <srikar(a)linux.vnet.ibm.com> wrote: > > > > Show all potential probes in a process by pid 21106 across all dsos > > > # perf probe -S -p 21106 | tail > > > > Again, a file based interface would be much more useful. E.g. what > > possible probe points do I have in my qemu binary. > > Right, Currently perf probe needs -p option because it depend on > thread->map_groups for listing the dsos and its functions. > > I am not sure if perf already has ability to list functions in a file esp if > we dont have dwarf information in that file. If perf has the ability I will > reuse it here or will try implementing one. Excellent - this would increase usability very visibly. People fundamentally like to work in the ASCII space: command names, function names, etc. People like to query these spaces to figure out what's available and use wildcards to define categories or limit queries. PIDs and addresses are useful too - but it's mostly for computers or for odd-one-out cases: tools and the occasional need-something-on-the-PID-level lowlevel workflow. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |