add new system file

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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/perf/Documentation/tips.txt
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 Show individual samples with: perf script
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 Limit to show entries above 5% only: perf report --percent-limit 5
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 Profiling branch (mis)predictions with: perf record -b / perf report
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+To show assembler sample contexts use perf record -b / perf script -F +brstackinsn --xed
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 Treat branches as callchains: perf report --branch-history
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 To count events in every 1000 msec: perf stat -I 1000
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 Print event counts in CSV format with: perf stat -x,
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 Show user configuration overrides: perf config --user --list
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 To add Node.js USDT(User-Level Statically Defined Tracing): perf buildid-cache --add `which node`
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 To report cacheline events from previous recording: perf c2c report
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+To browse sample contexts use perf report --sample 10 and select in context menu
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+To separate samples by time use perf report --sort time,overhead,sym
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+To set sample time separation other than 100ms with --sort time use --time-quantum
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+Add -I to perf record to sample register values, which will be visible in perf report sample context.
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+To show IPC for sampling periods use perf record -e '{cycles,instructions}:S' and then browse context
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+To show context switches in perf report sample context add --switch-events to perf record.