perf trace: Allow specifying a set of events to add in perfconfig (ac96287c) · Commits · 戴 / test

To add augmented_raw_syscalls to the events speficied by the user, or be the only one if no events were specified by the user, one can add this to perfconfig: # cat ~/.perfconfig [trace] add_events = /home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.o # I.e. pre-compile the augmented_raw_syscalls.c BPF program and make it always load, this way: # perf trace -e open* cat /etc/passwd > /dev/null 0.000 ( 0.013 ms): cat/31557 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) = 3 0.035 ( 0.007 ms): cat/31557 openat(dfd: CWD, filename: /lib64/libc.so.6, flags: CLOEXEC) = 3 0.353 ( 0.009 ms): cat/31557 openat(dfd: CWD, filename: /usr/lib/locale/locale-archive, flags: CLOEXEC) = 3 0.424 ( 0.006 ms): cat/31557 openat(dfd: CWD, filename: /etc/passwd) = 3 # Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-0lgj7vh64hg3ce44gsmvj7ud@git.kernel.org Signed-off-by:

Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-config.txt

+8 −0

Original line number	Diff line number	Diff line
		@@ -521,6 +521,14 @@ diff.*::
		Possible values are 'delta', 'delta-abs', 'ratio' and
		'wdiff'. Default is 'delta'.

		trace.*::
		trace.add_events::
		Allows adding a set of events to add to the ones specified
		by the user, or use as a default one if none was specified.
		The initial use case is to add augmented_raw_syscalls.o to
		activate the 'perf trace' logic that looks for syscall
		pointer contents after the normal tracepoint payload.

		SEE ALSO
		--------
		linkperf:perf[1]

tools/perf/builtin-trace.c

+20 −0

Original line number	Diff line number	Diff line
		@@ -22,6 +22,7 @@
		#include "builtin.h"
		#include "util/cgroup.h"
		#include "util/color.h"
		#include "util/config.h"
		#include "util/debug.h"
		#include "util/env.h"
		#include "util/event.h"
		@@ -3523,6 +3524,21 @@ static void trace__set_bpf_map_syscalls(struct trace *trace)
		trace->syscalls.map = bpf__find_map_by_name("syscalls");
		}

		static int trace__config(const char var, const char value, void *arg)
		{
		int err = 0;

		if (!strcmp(var, "trace.add_events")) {
		struct trace *trace = arg;
		struct option o = OPT_CALLBACK('e', "event", &trace->evlist, "event",
		"event selector. use 'perf list' to list available events",
		parse_events_option);
		err = parse_events_option(&o, value, 0);
		}

		return err;
		}

		int cmd_trace(int argc, const char **argv)
		{
		const char *trace_usage[] = {
		@@ -3645,6 +3661,10 @@ int cmd_trace(int argc, const char **argv)
		goto out;
		}

		err = perf_config(trace__config, &trace);
		if (err)
		goto out;

		argc = parse_options_subcommand(argc, argv, trace_options, trace_subcommands,
		trace_usage, PARSE_OPT_STOP_AT_NON_OPTION);

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