dd41f660c0
Counterpart of --switch-on:
# perf record -e sched:*,syscalls:sys_*_nanosleep sleep 1
[ perf record: Woken up 36 times to write data ]
[ perf record: Captured and wrote 0.032 MB perf.data (10 samples) ]
#
# perf script
:20918 20918 [002] 109866.143696: sched:sched_waking: comm=perf pid=20919 prio=120 target_cpu=001
:20918 20918 [002] 109866.143702: sched:sched_wakeup: perf:20919 [120] success=1 CPU:001
sleep 20919 [001] 109866.144081: sched:sched_process_exec: filename=/usr/bin/sleep pid=20919 old_pid=20919
sleep 20919 [001] 109866.144408: syscalls:sys_enter_nanosleep: rqtp: 0x7ffc2384fef0, rmtp: 0x00000000
sleep 20919 [001] 109866.144411: sched:sched_stat_runtime: comm=sleep pid=20919 runtime=521249 [ns] vruntime=202919398131 [n>
sleep 20919 [001] 109866.144412: sched:sched_switch: sleep:20919 [120] S ==> swapper/1:0 [120]
swapper 0 [001] 109867.144568: sched:sched_waking: comm=sleep pid=20919 prio=120 target_cpu=001
swapper 0 [001] 109867.144586: sched:sched_wakeup: sleep:20919 [120] success=1 CPU:001
sleep 20919 [001] 109867.144614: syscalls:sys_exit_nanosleep: 0x0
sleep 20919 [001] 109867.144753: sched:sched_process_exit: comm=sleep pid=20919 prio=120
#
# perf script --switch-off syscalls:sys_exit_nanosleep
:20918 20918 [002] 109866.143696: sched:sched_waking: comm=perf pid=20919 prio=120 target_cpu=001
:20918 20918 [002] 109866.143702: sched:sched_wakeup: perf:20919 [120] success=1 CPU:001
sleep 20919 [001] 109866.144081: sched:sched_process_exec: filename=/usr/bin/sleep pid=20919 old_pid=20919
sleep 20919 [001] 109866.144408: syscalls:sys_enter_nanosleep: rqtp: 0x7ffc2384fef0, rmtp: 0x00000000
sleep 20919 [001] 109866.144411: sched:sched_stat_runtime: comm=sleep pid=20919 runtime=521249 [ns] vruntime=202919398131 [n>
sleep 20919 [001] 109866.144412: sched:sched_switch: sleep:20919 [120] S ==> swapper/1:0 [120]
swapper 0 [001] 109867.144568: sched:sched_waking: comm=sleep pid=20919 prio=120 target_cpu=001
swapper 0 [001] 109867.144586: sched:sched_wakeup: sleep:20919 [120] success=1 CPU:001
sleep 20919 [001] 109867.144753: sched:sched_process_exit: comm=sleep pid=20919 prio=120
#
# perf script --switch-on syscalls:sys_enter_nanosleep --switch-off syscalls:sys_exit_nanosleep
sleep 20919 [001] 109866.144411: sched:sched_stat_runtime: comm=sleep pid=20919 runtime=521249 [ns] vruntime=202919398131 [n>
sleep 20919 [001] 109866.144412: sched:sched_switch: sleep:20919 [120] S ==> swapper/1:0 [120]
swapper 0 [001] 109867.144568: sched:sched_waking: comm=sleep pid=20919 prio=120 target_cpu=001
swapper 0 [001] 109867.144586: sched:sched_wakeup: sleep:20919 [120] success=1 CPU:001
#
# perf script --switch-on syscalls:sys_enter_nanosleep --switch-off syscalls:sys_exit_nanosleep --show-on-off
sleep 20919 [001] 109866.144408: syscalls:sys_enter_nanosleep: rqtp: 0x7ffc2384fef0, rmtp: 0x00000000
sleep 20919 [001] 109866.144411: sched:sched_stat_runtime: comm=sleep pid=20919 runtime=521249 [ns] vruntime=202919398131 [n>
sleep 20919 [001] 109866.144412: sched:sched_switch: sleep:20919 [120] S ==> swapper/1:0 [120]
swapper 0 [001] 109867.144568: sched:sched_waking: comm=sleep pid=20919 prio=120 target_cpu=001
swapper 0 [001] 109867.144586: sched:sched_wakeup: sleep:20919 [120] success=1 CPU:001
sleep 20919 [001] 109867.144614: syscalls:sys_exit_nanosleep: 0x0
#
Now think about using this together with 'perf probe' to create custom on/off
events in your app :-)
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: William Cohen <wcohen@redhat.com>
Link: https://lkml.kernel.org/n/tip-li3j01c4tmj9kw6ydsl8swej@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.