Messages in this thread |  | | From | Alexis Berlemont <> | Subject | [PATCH] Implement --delay on perf trace | Date | Mon, 10 Oct 2016 07:43:27 +0200 |
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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.
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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