https://bugzilla.kernel.org/show_bug.cgi?id=15856
Summary: acpi_processor_get_throttling_info taking excessive
time
Product: ACPI
Version: 2.5
Kernel Version: 2.6.32.11
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Power-Processor
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
On our test machine that has 1664 processors, we've discovered that
> the function acpi_processor_get_throttling_info takes 10 minutes.
> It's estimated that with 4096 cpus, this will take over 25 minutes.
>
> It seems that the acpi_processor_get_throttling_info serially queries
> each cpu with a "runon" function to extract the throttling states.
>
> My question is can this be optimized to use the previous processor's
> throttling states? Would there be any reason to expect any of the
> processors to be different?
>
> Another thought, if each processor needs to be queried, can the
> functions be run in parallel?
>
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