Messages in this thread |  | | Date | Fri, 14 Oct 2016 13:03:57 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH] Implement --delay on perf trace |
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Em Mon, Oct 10, 2016 at 07:43:27AM +0200, Alexis Berlemont escreveu: > Hi, > > In the perf wiki todo-list, there is an entry regarding initial-delay and > perf trace; the following small patch tries to fulfill this point. It > has been generated against the branch tip/perf/core. > > It has only been implemented in the "trace__run" case.
Ok, moved the description to the cset comment and added the entry to tools/perf/Documentation/perf-trace.txt, i.e. to its man page, just copying from the exact same description in 'perf stat' and 'perf record's ones.
What is next? :-)
- Arnaldo
> Ex.: > > $ sudo strace -- ./perf trace --delay 5 sleep 1 2>&1 > ... > fcntl(7, F_SETFL, O_RDONLY|O_NONBLOCK) = 0 > ioctl(7, PERF_EVENT_IOC_ID, 0x7ffc8fd35718) = 0 > ioctl(11, PERF_EVENT_IOC_SET_OUTPUT, 0x7) = 0 > fcntl(11, F_SETFL, O_RDONLY|O_NONBLOCK) = 0 > ioctl(11, PERF_EVENT_IOC_ID, 0x7ffc8fd35718) = 0 > write(6, "\0", 1) = 1 > close(6) = 0 > nanosleep({0, 5000000}, NULL) = 0 # DELAY OF 5 MS BEFORE ENABLING THE EVNTS > ioctl(3, PERF_EVENT_IOC_ENABLE, 0) = 0 > ioctl(4, PERF_EVENT_IOC_ENABLE, 0) = 0 > ioctl(5, PERF_EVENT_IOC_ENABLE, 0) = 0 > ioctl(7, PERF_EVENT_IOC_ENABLE, 0) = 0 > ... > > Alexis. > > Alexis Berlemont (1): > perf: implement --delay on perf trace > > tools/perf/builtin-trace.c | 10 +++++++++- > 1 file changed, 9 insertions(+), 1 deletion(-) > > -- > 2.10.0
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