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    SubjectRe: [PATCH 00/19] perf: ftrace enhancement
    Em Sun, May 10, 2020 at 11:06:09PM +0800, Changbin Du escreveu:
    > The perf has basic kernel ftrace support but lack support of most tracing
    > options. This serias is target to enhance the perf ftrace functionality so
    > that we can make full use of kernel ftrace with only perf.

    Quite a lot! Going thru it now.

    - Arnaldo

    > In general, this serias be cataloged into two main changes:
    > 1) Improve usability of existing functions. For example, we don't need to type
    > extra option to select the tracer.
    > 2) Add new options to support all other ftrace functions.
    >
    > Here is a glance of all ftrace functions with this serias:
    > * - improved existing options.
    > + - new added options.
    >
    > $ sudo perf ftrace -h
    >
    > Usage: perf ftrace [<options>] [<command>]
    > or: perf ftrace [<options>] -- <command> [<options>]
    >
    > * -a, --all-cpus system-wide collection from all CPUs
    > + -b, --buffer-size <n>
    > size of per cpu buffer in kb
    > -C, --cpu <cpu> list of cpus to monitor
    > + -d, --delay <n> Wait <n> ms before tracing
    > -D, --graph-depth <n>
    > Max depth for function graph tracer
    > * -G, --graph-funcs <func>
    > Set graph filter on given functions (imply to use function_graph tracer)
    > -g, --nograph-funcs <func>
    > Set nograph filter on given functions (imply to use function_graph tracer)
    > + -L, --list-functions List available functions to filter
    > + -l, --long-info Show process names, PIDs, timestamps, irq-info if available
    > -N, --notrace-funcs <func>
    > do not trace given functions
    > + -P, --no-pager Do not use pager
    > -p, --pid <pid> trace on existing process id
    > + -s, --func-stack-trace
    > Show kernel stack trace for function tracer
    > + -t, --tid <tid> trace on existing thread id (exclusive to --pid)
    > -T, --trace-funcs <func>
    > trace given functions only
    > + -u, --userstacktrace Show stacktrace of the current user space thread
    > -v, --verbose be more verbose
    > + --funcgraph-tail Show function tails comment (function_graph only)
    > + --latency-format displays additional information about the latency (function_graph only)
    > + --nofuncgraph-irqs
    > Ignore functions that happen inside interrupt (function_graph only)
    > + --nosleep-time Measure on-CPU time only (function_graph only)
    > + --trace-children Trace children processes
    > + --tracing-thresh <n>
    > Only show functions of which the duration is greater than <n>µs
    >
    >
    > Changbin Du (19):
    > perf ftrace: trace system wide if no target is given
    > perf ftrace: detect workload failure
    > perf ftrace: select function/function_graph tracer automatically
    > perf ftrace: add support for tracing option 'func_stack_trace'
    > perf ftrace: add option '-l/--list-functions' to list available
    > functions
    > perf ftrace: add support for trace option sleep-time
    > perf ftrace: add support for trace option funcgraph-irqs
    > perf ftrace: add option -l/--long-info to show more info
    > perf ftrace: add support for trace option tracing_thresh
    > perf ftrace: add support for trace option funcgraph-tail
    > perf ftrace: add option '-u/--userstacktrace' to show userspace
    > stacktrace
    > perf ftrace: add support for tracing children processes
    > perf ftrace: add option '-b/--buffer-size' to set per-cpu buffer size
    > perf ftrace: add option -P/--no-pager to disable pager
    > perf ftrace: show trace column header
    > perf ftrace: add option -t/--tid to filter by thread id
    > perf ftrace: add option -d/--delay to delay tracing
    > perf ftrace: add option --latency-format to display more info about
    > delay
    > perf ftrace: add change log
    >
    > tools/perf/Documentation/perf-config.txt | 5 -
    > tools/perf/builtin-ftrace.c | 388 ++++++++++++++++++++---
    > 2 files changed, 345 insertions(+), 48 deletions(-)
    >
    > --
    > 2.25.1
    >

    --

    - Arnaldo

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