Messages in this thread |  | | Date | Thu, 23 Oct 2014 17:57:34 +0900 | From | Masami Hiramatsu <> | Subject | Re: Re: [PATCH v3 5/5] perf/sdt: Add support to perf record to trace SDT events |
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(2014/10/23 17:21), Namhyung Kim wrote: > Hi Masami, > > On Thu, 23 Oct 2014 15:33:37 +0900, Masami Hiramatsu wrote: >> (2014/10/23 14:54), Srikar Dronamraju wrote: >>> I am somehow not able to figure out how perf probe comes into the >>> current workflow. >>> >>> I think the current design was >>> 1. perf sdt-cache --add <file> (only once per file) >>> 2. perf record -e <sdt-event> >>> >>> So what is the additional thing that perf probe does or Is it going to >>> replace any of the above steps? >> >> 3. perf probe -a <sdt-event> >> >> And this will be done subsequently in this series (without user interface part). >> However, current implementation of 2. will do the following steps >> >> s1. get sdt event data from sdt-cache >> s2. set up sdt events with suppressing messages >> s3. do recording events >> (s4. and hiding existing sdt events from perf-probe --list) >> s5. remove sdt events >> >> So, what I proposed were ; >> - to implement s2., we can introduce --quiet(-q) option and use it >> instead of ->sdt flag checking >> - removing s4. and s5. >> - and add verification of existing sdt events at s2. if needed. > > I'm okay with removing the s4 but not sure about the s5. In that case, > we might have many dynamic events in a system without noticing to users.
Indeed, okey, so let's keep s5 then :)
Thank you,
-- Masami HIRAMATSU Software Platform Research Dept. Linux Technology Research Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: masami.hiramatsu.pt@hitachi.com
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