perf tools: Add 'ping' control command
Add a control 'ping' command to detect if perf is up and its control interface is operational. It will be used in following daemon patches to synchronize with record session - when control interface is up and running, we know that perf record is monitoring and ready to receive signals. Example session: terminal 1: # mkfifo control ack # perf record --control=fifo:control,ack terminal 2: # echo ping > control # cat ack ack Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alexei Budankov <abudankov@huawei.com> Cc: Ian Rogers <irogers@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Michael Petlan <mpetlan@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lore.kernel.org/lkml/20201226232038.390883-5-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -652,6 +652,7 @@ Available commands:
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'disable name' : disable event 'name'
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'snapshot' : AUX area tracing snapshot).
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'stop' : stop perf record
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'ping' : ping
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'evlist [-v|-g|-F] : display all events
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-F Show just the sample frequency used for each event.
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@ -1950,6 +1950,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
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case EVLIST_CTL_CMD_ENABLE:
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case EVLIST_CTL_CMD_DISABLE:
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case EVLIST_CTL_CMD_EVLIST:
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case EVLIST_CTL_CMD_PING:
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default:
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break;
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}
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@ -623,6 +623,7 @@ static void process_evlist(struct evlist *evlist, unsigned int interval)
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case EVLIST_CTL_CMD_UNSUPPORTED:
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case EVLIST_CTL_CMD_EVLIST:
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case EVLIST_CTL_CMD_STOP:
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case EVLIST_CTL_CMD_PING:
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default:
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break;
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}
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@ -1943,6 +1943,9 @@ static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
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} else if (!strncmp(cmd_data, EVLIST_CTL_CMD_STOP_TAG,
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(sizeof(EVLIST_CTL_CMD_STOP_TAG)-1))) {
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*cmd = EVLIST_CTL_CMD_STOP;
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} else if (!strncmp(cmd_data, EVLIST_CTL_CMD_PING_TAG,
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(sizeof(EVLIST_CTL_CMD_PING_TAG)-1))) {
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*cmd = EVLIST_CTL_CMD_PING;
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}
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}
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@ -2081,6 +2084,7 @@ int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
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break;
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case EVLIST_CTL_CMD_SNAPSHOT:
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case EVLIST_CTL_CMD_STOP:
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case EVLIST_CTL_CMD_PING:
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break;
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case EVLIST_CTL_CMD_ACK:
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case EVLIST_CTL_CMD_UNSUPPORTED:
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@ -332,6 +332,7 @@ struct evsel *evlist__reset_weak_group(struct evlist *evlist, struct evsel *evse
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#define EVLIST_CTL_CMD_SNAPSHOT_TAG "snapshot"
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#define EVLIST_CTL_CMD_EVLIST_TAG "evlist"
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#define EVLIST_CTL_CMD_STOP_TAG "stop"
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#define EVLIST_CTL_CMD_PING_TAG "ping"
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#define EVLIST_CTL_CMD_MAX_LEN 64
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@ -343,6 +344,7 @@ enum evlist_ctl_cmd {
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EVLIST_CTL_CMD_SNAPSHOT,
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EVLIST_CTL_CMD_EVLIST,
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EVLIST_CTL_CMD_STOP,
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EVLIST_CTL_CMD_PING,
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};
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int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close);
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