Messages in this thread | | | From | "Rafael J. Wysocki" <> | Date | Wed, 4 Oct 2017 14:28:04 +0200 | Subject | Re: [PATCH v5 00/10] arm, arm64, cpufreq: frequency- and cpu-invariant accounting support for task scheduler |
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On Wed, Oct 4, 2017 at 10:41 AM, Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote: > On Tue, Sep 26, 2017 at 05:41:05PM +0100, Dietmar Eggemann wrote: >> For a more accurate (i.e. frequency- and cpu-invariant) accounting >> the task scheduler needs a frequency-scaling and on a heterogeneous >> system a cpu-scaling correction factor. >> >> This patch-set implements a Frequency Invariance Engine (FIE) >> based on the ratio of current frequency and maximum supported frequency >> (topology_get_freq_scale()) in the arch topology driver (arm, arm64) to >> provide such a frequency-scaling correction factor. >> This is a solution to get frequency-invariant accounting support for >> platforms without hardware-based performance tracking. >> >> The Cpu Invariance Engine (CIE) (topology_get_cpu_scale()) providing a >> cpu-scaling correction factor was already introduced by the "Fix issues >> and factorize arm/arm64 capacity information code" patch-set [1] which >> went into v4.13. >> >> This patch-set also enables the frequency- and cpu-invariant accounting >> support. Enabling here means to associate (wire) the task scheduler >> function name arch_scale_freq_capacity and arch_scale_cpu_capacity with >> the FIE and CIE function names from drivers/base/arch_topology.c. This >> replaces the scheduler's default FIE and CIE in kernel/sched/sched.h. >> >> v4: review results: >> >> There were no further comments during the v4 [2] review. > > This patchset crosses a bunch of different subsystems, who do you > want/expect to be taking this through their tree?
Dietmar asked me and I can handle it it that's not an issue.
Thanks, Rafael
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