Messages in this thread | | | Date | Wed, 20 May 2020 17:31:28 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH 00/19] perf: ftrace enhancement |
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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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