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Date: Sat, 2 Jan 2021 23:04:29 +0100 From: Jiri Olsa <jolsa@...nel.org> To: Arnaldo Carvalho de Melo <acme@...nel.org> Cc: lkml <linux-kernel@...r.kernel.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Ingo Molnar <mingo@...nel.org>, Mark Rutland <mark.rutland@....com>, Namhyung Kim <namhyung@...nel.org>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Michael Petlan <mpetlan@...hat.com>, Ian Rogers <irogers@...gle.com>, Stephane Eranian <eranian@...gle.com>, Alexei Budankov <abudankov@...wei.com> Subject: [PATCH 10/22] perf daemon: Add signal command Allow perf daemon to send SIGUSR2 to all running sessions or just to a specific session. Example: # cat ~/.perfconfig [daemon] base=/opt/perfdata [session-cycles] run = -m 10M -e cycles --overwrite --switch-output -a [session-sched] run = -m 20M -e sched:* --overwrite --switch-output -a Starting the daemon: # perf daemon start Send signal to all running sessions: # perf daemon signal signal 12 sent to session 'cycles [773738]' signal 12 sent to session 'sched [773739]' Or to specific one: # perf daemon signal --session sched signal 12 sent to session 'sched [773739]' And verify signals were delivered and perf.data dumped: # cat /opt/perfdata/session-cycles/output rounding mmap pages size to 32M (8192 pages) [ perf record: dump data: Woken up 1 times ] [ perf record: Dump perf.data.2021010220382490 ] # car /opt/perfdata/session-sched/output rounding mmap pages size to 32M (8192 pages) [ perf record: dump data: Woken up 1 times ] [ perf record: Dump perf.data.2021010220382489 ] [ perf record: dump data: Woken up 1 times ] [ perf record: Dump perf.data.2021010220393745 ] Signed-off-by: Jiri Olsa <jolsa@...nel.org> --- tools/perf/builtin-daemon.c | 64 ++++++++++++++++++++++++++++++++++++- 1 file changed, 63 insertions(+), 1 deletion(-) diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c index 644f196d7f39..a7ffbecf8d14 100644 --- a/tools/perf/builtin-daemon.c +++ b/tools/perf/builtin-daemon.c @@ -522,10 +522,13 @@ static int setup_server_socket(struct daemon *daemon) } enum { - CMD_LIST = 0, + CMD_LIST = 0, + CMD_SIGNAL = 1, CMD_MAX, }; +#define SESSION_MAX 64 + union cmd { int cmd; @@ -535,6 +538,13 @@ union cmd { int verbose; char csv_sep; } list; + + /* CMD_SIGNAL */ + struct { + int cmd; + int sig; + char name[SESSION_MAX]; + } signal; }; static int cmd_session_list(struct daemon *daemon, union cmd *cmd, FILE *out) @@ -592,6 +602,24 @@ static int cmd_session_list(struct daemon *daemon, union cmd *cmd, FILE *out) return 0; } +static int cmd_session_kill(struct daemon *daemon, union cmd *cmd, FILE *out) +{ + struct session *session; + bool all = false; + + all = !strcmp(cmd->signal.name, "all"); + + list_for_each_entry(session, &daemon->sessions, list) { + if (all || !strcmp(cmd->signal.name, session->name)) { + session__signal(session, cmd->signal.sig); + fprintf(out, "signal %d sent to session '%s [%d]'\n", + cmd->signal.sig, session->name, session->pid); + } + } + + return 0; +} + static int handle_server_socket(struct daemon *daemon, int sock_fd) { int ret = -EINVAL, fd; @@ -619,6 +647,9 @@ static int handle_server_socket(struct daemon *daemon, int sock_fd) case CMD_LIST: ret = cmd_session_list(daemon, &cmd, out); break; + case CMD_SIGNAL: + ret = cmd_session_kill(daemon, &cmd, out); + break; default: break; } @@ -933,6 +964,34 @@ static int send_cmd_list(struct daemon *daemon) return send_cmd(daemon, &cmd); } +static int __cmd_signal(struct daemon *daemon, struct option parent_options[], + int argc, const char **argv) +{ + const char *name = "all"; + struct option start_options[] = { + OPT_STRING(0, "session", &name, "session", + "Sent signal to specific session"), + OPT_PARENT(parent_options), + OPT_END() + }; + union cmd cmd; + + argc = parse_options(argc, argv, start_options, daemon_usage, 0); + if (argc) + usage_with_options(daemon_usage, start_options); + + if (setup_config(daemon)) { + pr_err("failed: config not found\n"); + return -1; + } + + cmd.signal.cmd = CMD_SIGNAL, + cmd.signal.sig = SIGUSR2; + strncpy(cmd.signal.name, name, sizeof(cmd.signal.name) - 1); + + return send_cmd(daemon, &cmd); +} + int cmd_daemon(int argc, const char **argv) { struct option daemon_options[] = { @@ -954,6 +1013,9 @@ int cmd_daemon(int argc, const char **argv) return __cmd_start(&__daemon, daemon_options, argc, argv); if (argc) { + if (!strcmp(argv[0], "signal")) + return __cmd_signal(&__daemon, daemon_options, argc, argv); + pr_err("failed: unknown command '%s'\n", argv[0]); return -1; } -- 2.26.2
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