diff options
| author | Ulf Hermann <ulf.hermann@qt.io> | 2017-11-21 14:52:00 +0100 |
|---|---|---|
| committer | Ulf Hermann <ulf.hermann@qt.io> | 2017-11-21 14:48:12 +0000 |
| commit | 14db426133dbd9b1f8a481350c8b8603e25d8fc2 (patch) | |
| tree | c669389a03af37f9a7966a10156c653438f85dfe /doc | |
| parent | 194bde265c9c207052f1039c54cf9d6cb32703c8 (diff) | |
Fix outdated perf profiler documentation
The event types should now be chosen in a structured way, not as
additional arguments. This is a hotfix for 4.5. A more comprehensive
documentation of the settings will follow in master.
Task-number: QTCREATORBUG-19321
Change-Id: I56670bd8d54fa8a62eb35951d86e4023a2a8c680
Reviewed-by: Kari Oikarinen <kari.oikarinen@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/src/analyze/cpu-usage-analyzer.qdoc | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/doc/src/analyze/cpu-usage-analyzer.qdoc b/doc/src/analyze/cpu-usage-analyzer.qdoc index dddea53102..b5d4b094a3 100644 --- a/doc/src/analyze/cpu-usage-analyzer.qdoc +++ b/doc/src/analyze/cpu-usage-analyzer.qdoc @@ -350,15 +350,14 @@ performance counters are dysfunctional and the Linux kernel may randomly fail to record data after some time. Perf can use different types of events to trigger samples. You can get a list of available - event types by running \c {perf list} on the device and add - \c {-e <event type>} to the \uicontrol {Additional arguments} field - to change the event type to be used. The choice of event type - affects the performance and stability of the sampling. - \c {-e cpu-clock} is a safe but relatively slow option as it - does not use the hardware performance counters, but drives the - sampling from software. After the sampling has failed, reboot the - device. The kernel may have disabled important parts of the - performance counters system. + event types by running \c {perf list} on the device and then choose + the respective event types in the settings. The choice of event type + affects the performance and stability of the sampling. The + \c {cpu-clock} \c {software} event is a safe but relatively slow + option as it does not use the hardware performance counters, but + drives the sampling from software. After the sampling has failed, + reboot the device. The kernel may have disabled important parts of + the performance counters system. \endlist Output from the helper program that processes the data is displayed in the |