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[Draft] [SPE] Add jitter to SPE functionality#70
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PrzemekWirkus wants to merge 4 commits intoarm-developer-tools:mainfrom
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[Draft] [SPE] Add jitter to SPE functionality#70PrzemekWirkus wants to merge 4 commits intoarm-developer-tools:mainfrom
PrzemekWirkus wants to merge 4 commits intoarm-developer-tools:mainfrom
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- The sample period is set from the `period`, and because the minimum interval is used by default it’s recommended to set this to a higher value. The value is written to PMSIRR.INTERVAL. - `jitter=1` - use jitter to avoid resonance when sampling (PMSIRR.RND).
everton1984
approved these changes
Nov 8, 2024
PrzemekWirkus
changed the title
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Description
** This is work in progress **
In this patch I'm introducing jitter to SPE configuration. Below two new
arm_+spe_0jitter=1- use jitter to avoid resonance when sampling (PMSIRR.RND).period=<n>- The sample period is set in Linux perf from the -c option. We will pass it to SPE configuration as new filterperiod=<n>as-cis taken inwperfCLI for other setting.PMSIRR.INTERVAL.isb()after every sysreg write to make sure change propagates.Testing
This patch is causing below issue in WindowsPerf, and needs further investigation.