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 perf.
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: $ sudo perf ftrace -h Usage: perf ftrace [<options>] [<command>] or: perf ftrace [<options>] -- <command> [<options>] -a, --all-cpus system-wide collection from all CPUs -C, --cpu <cpu> list of cpus to monitor -d, --delay <n> ms to wait before starting tracing after program start -D, --graph-depth <n> Max depth for function graph tracer -F, --funcs Show available functions to filter -G, --graph-funcs <func> trace given functions using function_graph tracer -g, --nograph-funcs <func> Set nograph filter on given functions -m, --buffer-size <n> size of per cpu buffer in kb -N, --notrace-funcs <func> do not trace given functions -p, --pid <pid> trace on existing process id -t, --tid <tid> trace on existing thread id (exclusive to --pid) -T, --trace-funcs <func> trace given functions using function tracer -t, --tracer <tracer> tracer to use: function or function_graph (This option is deprecated) -v, --verbose be more verbose --func-call-graph show kernel stack trace for function tracer --func-irq-info display irq info for function tracer --graph-noirqs ignore functions that happen inside interrupt for function_graph tracer --graph-nosleep-time measure on-CPU time only for function_graph tracer --graph-thresh <n> only show functions of which the duration is greater than <n>µs --graph-verbose show process names, PIDs, timestamps for function_graph tracer --inherit trace children processes v2: o patches for option '-u/--userstacktrace' and '--no-pager' are dropped. o update all related perf documentation. o rename some options. Now all funcgraph tracer options are prefixed with '--graph-', while all function tracer options are prefixed with '--func-'. o mark old options deprecated instead of removing them. Changbin Du (15): perf ftrace: select function/function_graph tracer automatically perf ftrace: add option '-F/--funcs' to list available functions perf ftrace: add option -t/--tid to filter by thread id perf ftrace: add option -d/--delay to delay tracing perf ftrace: factor out function write_tracing_file_int() perf ftrace: add option '-m/--buffer-size' to set per-cpu buffer size perf ftrace: show trace column header perf ftrace: add option '--inherit' to trace children processes perf ftrace: add support for tracing option 'func_stack_trace' perf ftrace: add support for trace option sleep-time perf ftrace: add support for trace option funcgraph-irqs perf ftrace: add support for tracing option 'irq-info' perf ftrace: add option '--graph-verbose' to show more info for graph tracer perf ftrace: add support for trace option tracing_thresh perf ftrace: add change log tools/perf/Documentation/perf-config.txt | 5 - tools/perf/Documentation/perf-ftrace.txt | 39 ++- tools/perf/builtin-ftrace.c | 295 +++++++++++++++++++++-- 3 files changed, 319 insertions(+), 20 deletions(-) -- 2.25.1