lib: sbi: Add Sscpuutil (CPU Utilization) extension support#11
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Estherrzhang wants to merge 1 commit into
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lib: sbi: Add Sscpuutil (CPU Utilization) extension support#11Estherrzhang wants to merge 1 commit into
Estherrzhang wants to merge 1 commit into
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Add support for the Sscpuutil extension which enables frequency- invariant CPU utilization tracking by the OS scheduler. The extension provides dedicated CSR counters (corecyc at 0xc30 and acttime at 0xc31) for computing CPU utilization. Their ratio gives: effective_freq = ref_freq * (Dcycle / Dacttime) Key implementation details: - Detect Sscpuutil by probing CSR_MACTTIME (0xb31). - Enable S/U-mode access via mcpuutilen (0x320) and scpuutilen (0x120). Signed-off-by: Esther Z <zhangfengxue.zfx@alibaba-inc.com>
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Add support for the Sscpuutil extension which enables frequency- invariant CPU utilization tracking by the OS scheduler.
The extension provides dedicated CSR counters (corecyc at 0xc30 and acttime at 0xc31) for computing CPU utilization. Their ratio gives:
effective_freq = ref_freq * (Dcycle / Dacttime)
Key implementation details: