On Friday, June 2, 2017 5:48:10 PM CEST Andi Kleen wrote: > From: Andi Kleen <[email protected]> > > With perf script it is common that we just want to add or remove a field. > Currently this requires figuring out the long list of default fields and > specifying them first, and then adding/removing the new field. > > This patch adds a new + - syntax to merely add or remove fields, > that allows more succint and clearer command lines > > For example to remove the comm field from PMU samples: > > Previously > > perf script -F tid,cpu,time,event,sym,ip,dso,period > 0 [000] 504345.383126: 1 cycles: ffffffff90060c66 > native_write_msr ([kernel.kallsyms]) > > with the new syntax > > perf script -F -comm > 0 [000] 504345.383126: 1 cycles: ffffffff90060c66 > native_write_msr ([kernel.kallsyms]) > > The new syntax cannot be mixed with normal overriding.
Tested-by: Milian Wolff <[email protected]> Works a charm. But I notice that this functionality is missing in other places too. Most notably, I would like to be able to configure `perf stat` in a similar way. Such that one could do: perf stat -e +cache-misses Instead of perf stat -e <whatever the defaults are>,cache-misses While at it, I also think it would be tremendously useful to get wildcard matching behavior in all perf tools. Currently, I can do: perf list "topdown-*" List of pre-defined events (to be used in -e): topdown-fetch-bubbles OR cpu/topdown-fetch-bubbles/ [Kernel PMU event] topdown-recovery-bubbles OR cpu/topdown-recovery-bubbles/ [Kernel PMU event] topdown-slots-issued OR cpu/topdown-slots-issued/ [Kernel PMU event] topdown-slots-retired OR cpu/topdown-slots-retired/ [Kernel PMU event] topdown-total-slots OR cpu/topdown-total-slots/ [Kernel PMU event] But I cannot do: $ perf record -e "topdown-*" ls event syntax error: 'topdown-*' \___ parser error Run 'perf list' for a list of valid events But of course I'm aware that these are all separate issues. But Andi, you seem to be working a lot on polishing perf. I'd really appreciate it if you could also implement the above two suggestions. Otherwise I'll try to see when I get the time to do it myself. Cheers -- Milian Wolff | [email protected] | Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt Experts
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