On 10 September 2014 17:15, Daniel Lezcano daniel.lezcano@linaro.org wrote:
On 09/10/2014 09:33 AM, pi-cheng.chen wrote:
When using intel_pstate driver, "scaling_available_freqs" attr is not exported to sysfs. It causes assertion of idlestat due to memory of struct cpufreq_pstate was not allocated.
Allocate struct cpufreq_pstate dynamically when getting frequency information from trace file instead of parsing available frequencies from sysfs
Changes v1 to v2: Sort the cpufreq_pstate list when parsing events
Signed-off-by: Pi-Cheng Chen pi-cheng.chen@linaro.org
Tested on intel_pstate and legacy cpufreq driver.
In complement of this feature, I think the cpus cpufreq must be initialized with the 'cpuinfo_cur_freq' with the start time initialized to the beginning of the acquisition. If a cpu is in a specific freq without any changes (understand: ftrace transitions which trigger the p-state creation), we will have a long freq residency (the initial one).
Today we don't have this, so the cpus without freq changes are not displayed.
At least the minimal number of p-state should be '1' not '0' (except if cpufreq is disabled).
-- Daniel
How about to create some "fake records" manually in the trace file? Get p-states of all CPUs first before starting tracing and write them as fake records of p-state transitions before storing the traces from sysfs to trace file. So that the report will be consistent with that generated by import mode.
Pi-Cheng