From: Changbin Du <changbin.du@gmail.com>
To: Jiri Olsa <jolsa@redhat.com>, Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Namhyung Kim <namhyung@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
linux-kernel@vger.kernel.org, Changbin Du <changbin.du@gmail.com>
Subject: [PATCH v8 06/18] perf ftrace: add option '--inherit' to trace children processes
Date: Sat, 8 Aug 2020 10:31:29 +0800 [thread overview]
Message-ID: <20200808023141.14227-7-changbin.du@gmail.com> (raw)
In-Reply-To: <20200808023141.14227-1-changbin.du@gmail.com>
This adds an option '--inherit' to allow us trace children
processes spawned by our target.
Signed-off-by: Changbin Du <changbin.du@gmail.com>
---
v2: option name '--trace-children' -> '--inherit'.
---
tools/perf/Documentation/perf-ftrace.txt | 3 ++
tools/perf/builtin-ftrace.c | 38 ++++++++++++++++++++++++
2 files changed, 41 insertions(+)
diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt
index 7a5d915f60b0..c46d0a09b38c 100644
--- a/tools/perf/Documentation/perf-ftrace.txt
+++ b/tools/perf/Documentation/perf-ftrace.txt
@@ -58,6 +58,9 @@ OPTIONS
Set the size of per-cpu tracing buffer, <size> is expected to
be a number with appended unit character - B/K/M/G.
+--inherit::
+ Trace children processes spawned by our target.
+
-T::
--trace-funcs=::
Select function tracer and set function filter on the given
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 39c694be2b71..07b81d0c1658 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -41,6 +41,7 @@ struct perf_ftrace {
struct list_head nograph_funcs;
int graph_depth;
unsigned long percpu_buffer_size;
+ bool inherit;
};
struct filter_entry {
@@ -182,9 +183,27 @@ static int write_tracing_file_int(const char *name, int value)
return 0;
}
+static int write_tracing_option_file(const char *name, const char *val)
+{
+ char *file;
+ int ret;
+
+ if (asprintf(&file, "options/%s", name) < 0)
+ return -1;
+
+ ret = __write_tracing_file(file, val, false);
+ free(file);
+ return ret;
+}
+
static int reset_tracing_cpu(void);
static void reset_tracing_filters(void);
+static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused)
+{
+ write_tracing_option_file("function-fork", "0");
+}
+
static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
{
if (write_tracing_file("tracing_on", "0") < 0)
@@ -203,6 +222,7 @@ static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
return -1;
reset_tracing_filters();
+ reset_tracing_options(ftrace);
return 0;
}
@@ -341,6 +361,17 @@ static int set_tracing_percpu_buffer_size(struct perf_ftrace *ftrace)
return 0;
}
+static int set_tracing_trace_inherit(struct perf_ftrace *ftrace)
+{
+ if (!ftrace->inherit)
+ return 0;
+
+ if (write_tracing_option_file("function-fork", "1") < 0)
+ return -1;
+
+ return 0;
+}
+
static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
{
char *trace_file;
@@ -410,6 +441,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
goto out_reset;
}
+ if (set_tracing_trace_inherit(ftrace) < 0) {
+ pr_err("failed to set tracing option function-fork\n");
+ goto out_reset;
+ }
+
if (write_tracing_file("current_tracer", ftrace->tracer) < 0) {
pr_err("failed to set current_tracer to %s\n", ftrace->tracer);
goto out_reset;
@@ -618,6 +654,8 @@ int cmd_ftrace(int argc, const char **argv)
"Max depth for function graph tracer"),
OPT_CALLBACK('m', "buffer-size", &ftrace.percpu_buffer_size, "size",
"size of per cpu buffer", parse_buffer_size),
+ OPT_BOOLEAN(0, "inherit", &ftrace.inherit,
+ "trace children processes"),
OPT_END()
};
--
2.25.1
next prev parent reply other threads:[~2020-08-08 2:36 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-08 2:31 [PATCH v8 00/18] [PATCH v7 00/18] perf: ftrace enhancement Changbin Du
2020-08-08 2:31 ` [PATCH v8 01/18] perf ftrace: select function/function_graph tracer automatically Changbin Du
2020-08-08 2:31 ` [PATCH v8 02/18] perf ftrace: add option '-F/--funcs' to list available functions Changbin Du
2020-08-14 11:35 ` Arnaldo Carvalho de Melo
2020-08-20 15:18 ` Changbin Du
2020-08-08 2:31 ` [PATCH v8 03/18] perf ftrace: factor out function write_tracing_file_int() Changbin Du
2020-08-08 2:31 ` [PATCH v8 04/18] perf ftrace: add option '-m/--buffer-size' to set per-cpu buffer size Changbin Du
2020-08-14 11:53 ` Arnaldo Carvalho de Melo
2020-08-14 12:12 ` Arnaldo Carvalho de Melo
2020-08-14 12:58 ` Arnaldo Carvalho de Melo
2020-08-08 2:31 ` [PATCH v8 05/18] perf ftrace: show trace column header Changbin Du
2020-08-14 11:56 ` Arnaldo Carvalho de Melo
2020-08-14 11:57 ` Arnaldo Carvalho de Melo
2020-08-08 2:31 ` Changbin Du [this message]
2020-08-14 12:12 ` [PATCH v8 06/18] perf ftrace: add option '--inherit' to trace children processes Arnaldo Carvalho de Melo
2020-08-08 2:31 ` [PATCH v8 07/18] perf: util: add general function to parse sublevel options Changbin Du
2020-08-08 2:31 ` [PATCH v8 08/18] perf ftrace: add support for tracing option 'func_stack_trace' Changbin Du
2020-08-14 12:24 ` Arnaldo Carvalho de Melo
2020-08-20 15:15 ` Changbin Du
2020-08-08 2:31 ` [PATCH v8 09/18] perf ftrace: add support for trace option sleep-time Changbin Du
2020-08-14 12:26 ` Arnaldo Carvalho de Melo
2020-08-08 2:31 ` [PATCH v8 10/18] perf ftrace: add support for trace option funcgraph-irqs Changbin Du
2020-08-14 12:27 ` Arnaldo Carvalho de Melo
2020-08-08 2:31 ` [PATCH v8 11/18] perf ftrace: add support for tracing option 'irq-info' Changbin Du
2020-08-14 12:28 ` Arnaldo Carvalho de Melo
2020-08-20 15:09 ` Changbin Du
2020-08-08 2:31 ` [PATCH v8 12/18] perf ftrace: add option 'verbose' to show more info for graph tracer Changbin Du
2020-08-08 2:31 ` [PATCH v8 13/18] perf ftrace: add support for trace option tracing_thresh Changbin Du
2020-08-14 12:33 ` Arnaldo Carvalho de Melo
2020-08-20 15:08 ` Changbin Du
2020-08-08 2:31 ` [PATCH v8 14/18] perf: ftrace: allow set graph depth by '--graph-opts' Changbin Du
2020-08-08 2:31 ` [PATCH v8 15/18] perf ftrace: add option -D/--delay to delay tracing Changbin Du
2020-08-08 2:31 ` [PATCH v8 16/18] perf ftrace: add option --tid to filter by thread id Changbin Du
2020-08-08 2:31 ` [PATCH v8 17/18] perf: ftrace: Add set_tracing_options() to set all trace options Changbin Du
2020-08-08 2:31 ` [PATCH v8 18/18] perf ftrace: add change log Changbin Du
2020-08-14 12:38 ` [PATCH v8 00/18] [PATCH v7 00/18] perf: ftrace enhancement Arnaldo Carvalho de Melo
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