riscv: add Sscpuutil extension support for frequency invariance - #26
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Estherrzhang wants to merge 1 commit into
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riscv: add Sscpuutil extension support for frequency invariance#26Estherrzhang wants to merge 1 commit into
Estherrzhang wants to merge 1 commit into
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Add support for the RISC-V Sscpuutil (CPU Utilization) extension to provide Frequency Invariance Engine (FIE) for the scheduler. The extension provides two CSR counters: corecyc (0xc30) increments at actual CPU frequency, acttime (0xc31) increments at a fixed reference rate. Their ratio gives the current-to-nominal frequency scaling factor used by the scheduler for accurate load tracking. Signed-off-by: Esther Z <zhangfengxue.zfx@alibaba-inc.com>
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Add support for the RISC-V Sscpuutil (CPU Utilization) extension to provide Frequency Invariance Engine (FIE) for the scheduler.
The extension provides two CSR counters: corecyc (0xc30) increments at actual CPU frequency, acttime (0xc31) increments at a fixed reference rate. Their ratio gives the current-to-nominal frequency scaling factor used by the scheduler for accurate load tracking.