(2014/02/26 17:18), Namhyung Kim wrote: > Hi Masami and Hemant, > > On Tue, 25 Feb 2014 21:27:07 +0530, Hemant Kumar wrote: >> On 02/25/2014 05:14 PM, Masami Hiramatsu wrote: >>> (2014/02/24 18:14), Hemant Kumar wrote: >>>> First, scan the binaries using : >>>> # perf list sdt --scan >>>> >>>> Creating a cache of SDT markers... >>>> perf sdt cache created! >>>> Use : "perf list sdt" >>>> to see the SDT markers >>> Hmm, in that case, I think you'd better introduce perf-sdt for scanning. >>> e.g. >>> >>> # perf sdt --scan app >> >> Hmm, this seems a better idea :) >> >>> then you can add app to sdt cache, without app, >>> >>> # perf sdt --scan >>> >>> will just scans all binaries on the PATH and the libraries which listed >>> by `ldconfig --print-caceh` > > What should be done with the new perf sdt command? If it's only > intended to list the markers, I'd just suggest to add "perf list sdt" as > this patch did. > > Plus I think it'd be better if event_glob pattern also looks for sdt > markers so that user can find out a specific markers easily, e.g.: > > # perf list rtld:* > > or > > # perf list %rtld:*
Ah, that's a good idea :) >>> >>> And perf-list shows only the SDTs in the cache. >> >> Well, what will be better? perf-list or perf-sdt or perf-list sdt?? >> If perf-list, then wouldn't it be a huge list!! > > The output of perf list is already a huge list and we paginate it. So I > don't think it's gonna be a problem. :) Agreed. >>>> - Add support to probe these SDT markers and integrate with a previous >>>> patch >>>> (support to perf to probe SDT markers) posted in lkml. >>>> https://lkml.org/lkml/2013/10/23/10 >>> Yeah, but I think we'd better choose another way to integrate it. >>> Since SDT is like markers(static events), setting each of them via >>> perf-probe is >>> not intuitive. :) I'd like to use it as an event, e.g. >>> >>> # perf top -e "%libgcc:unwind" >>> >>> And perf top internally calls perf-probe to add new uprobe event, and >>> clean the new event at exit. >> >> Yeah! Right :) Makes sense. Note that we will need an option to make it permanent (not clear the event on exit) for people who want to use SDT event from ftrace. :) >> Will implement the suggestions in the next version asap! > > That would be great! Thank you! -- Masami HIRAMATSU IT Management Research Dept. Linux Technology Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: masami.hiramatsu...@hitachi.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
