Messages in this thread Patch in this message | | | From | Jiri Olsa <> | Subject | [PATCH 2/3] perf tools: Allow to enable/disable events via control file | Date | Thu, 10 Dec 2020 21:43:29 +0100 |
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Adding new control events to enable/disable specific event. The interface string for control file are:
'enable-<EVENT NAME>' 'disable-<EVENT NAME>'
when received the command, perf will scan the current evlist for <EVENT NAME> and if found it's enabled/disabled.
Example session:
terminal 1: # mkfifo control ack perf.pipe # perf record --control=fifo:control,ack -D -1 --no-buffering -e 'sched:*' -o - > perf.pipe Events disabled
terminal 2: # cat perf.pipe | ./perf --no-pager script -i -
terminal 3: # echo enable-sched:sched_process_fork > control
terminal 1: # mkfifo control ack perf.pipe # perf record --control=fifo:control,ack -D -1 --no-buffering -e 'sched:*' -o - > perf.pipe ... event sched:sched_process_fork enabled
terminal 2: # cat perf.pipe | ./perf --no-pager script -i - bash 33349 [034] 149587.674295: sched:sched_process_fork: comm=bash pid=33349 child_comm=bash child_pid=34056 bash 33349 [034] 149588.239521: sched:sched_process_fork: comm=bash pid=33349 child_comm=bash child_pid=34057
terminal 3: # echo enable-sched:sched_wakeup_new > control
terminal 1: # mkfifo control ack perf.pipe # perf record --control=fifo:control,ack -D -1 --no-buffering -e 'sched:*' -o - > perf.pipe ... event sched:sched_wakeup_new enabled
terminal 2: # cat perf.pipe | ./perf --no-pager script -i - ... bash 33349 [034] 149632.228023: sched:sched_process_fork: comm=bash pid=33349 child_comm=bash child_pid=34059 bash 33349 [034] 149632.228050: sched:sched_wakeup_new: bash:34059 [120] success=1 CPU:036 bash 33349 [034] 149633.950005: sched:sched_process_fork: comm=bash pid=33349 child_comm=bash child_pid=34060 bash 33349 [034] 149633.950030: sched:sched_wakeup_new: bash:34060 [120] success=1 CPU:036
Acked-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Jiri Olsa <jolsa@kernel.org> --- tools/perf/builtin-record.c | 2 ++ tools/perf/builtin-stat.c | 2 ++ tools/perf/util/evlist.c | 30 +++++++++++++++++++++++++++++- tools/perf/util/evlist.h | 4 ++++ 4 files changed, 37 insertions(+), 1 deletion(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index d832c108a1ca..582b8fba012c 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -1949,6 +1949,8 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) break; case EVLIST_CTL_CMD_ACK: case EVLIST_CTL_CMD_UNSUPPORTED: + case EVLIST_CTL_CMD_ENABLE_EVSEL: + case EVLIST_CTL_CMD_DISABLE_EVSEL: default: break; } diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 89c32692f40c..6a21fb665008 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -590,6 +590,8 @@ static void process_evlist(struct evlist *evlist, unsigned int interval) case EVLIST_CTL_CMD_SNAPSHOT: case EVLIST_CTL_CMD_ACK: case EVLIST_CTL_CMD_UNSUPPORTED: + case EVLIST_CTL_CMD_ENABLE_EVSEL: + case EVLIST_CTL_CMD_DISABLE_EVSEL: default: break; } diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 70aff26612a9..729c98d10628 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -1915,7 +1915,13 @@ static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd, bytes_read == data_size ? "" : c == '\n' ? "\\n" : "\\0"); if (bytes_read > 0) { - if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG, + if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_EVSEL_TAG, + (sizeof(EVLIST_CTL_CMD_ENABLE_EVSEL_TAG)-1))) { + *cmd = EVLIST_CTL_CMD_ENABLE_EVSEL; + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_EVSEL_TAG, + (sizeof(EVLIST_CTL_CMD_DISABLE_EVSEL_TAG)-1))) { + *cmd = EVLIST_CTL_CMD_DISABLE_EVSEL; + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG, (sizeof(EVLIST_CTL_CMD_ENABLE_TAG)-1))) { *cmd = EVLIST_CTL_CMD_ENABLE; } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_TAG, @@ -1952,6 +1958,8 @@ int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd) char cmd_data[EVLIST_CTL_CMD_MAX_LEN]; int ctlfd_pos = evlist->ctl_fd.pos; struct pollfd *entries = evlist->core.pollfd.entries; + struct evsel *evsel; + char *evsel_name; if (!evlist__ctlfd_initialized(evlist) || !entries[ctlfd_pos].revents) return 0; @@ -1967,6 +1975,26 @@ int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd) case EVLIST_CTL_CMD_DISABLE: evlist__disable(evlist); break; + case EVLIST_CTL_CMD_ENABLE_EVSEL: + evsel_name = cmd_data + sizeof(EVLIST_CTL_CMD_ENABLE_EVSEL_TAG) - 1; + evsel = evlist__find_evsel_by_str(evlist, evsel_name); + if (evsel) { + evlist__enable_evsel(evlist, evsel_name); + pr_info("event %s enabled\n", evsel->name); + } else { + pr_info("failed: can't find '%s' event\n", evsel_name); + } + break; + case EVLIST_CTL_CMD_DISABLE_EVSEL: + evsel_name = cmd_data + sizeof(EVLIST_CTL_CMD_DISABLE_EVSEL_TAG) - 1; + evsel = evlist__find_evsel_by_str(evlist, evsel_name); + if (evsel) { + evlist__disable_evsel(evlist, evsel_name); + pr_info("event %s disabled\n", evsel->name); + } else { + pr_info("failed: can't find '%s' event\n", evsel_name); + } + break; case EVLIST_CTL_CMD_SNAPSHOT: break; case EVLIST_CTL_CMD_ACK: diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index 1aae75895dea..e4e8ff8831a3 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -330,6 +330,8 @@ struct evsel *evlist__reset_weak_group(struct evlist *evlist, struct evsel *evse #define EVLIST_CTL_CMD_DISABLE_TAG "disable" #define EVLIST_CTL_CMD_ACK_TAG "ack\n" #define EVLIST_CTL_CMD_SNAPSHOT_TAG "snapshot" +#define EVLIST_CTL_CMD_ENABLE_EVSEL_TAG "enable-" +#define EVLIST_CTL_CMD_DISABLE_EVSEL_TAG "disable-" #define EVLIST_CTL_CMD_MAX_LEN 64 @@ -337,6 +339,8 @@ enum evlist_ctl_cmd { EVLIST_CTL_CMD_UNSUPPORTED = 0, EVLIST_CTL_CMD_ENABLE, EVLIST_CTL_CMD_DISABLE, + EVLIST_CTL_CMD_ENABLE_EVSEL, + EVLIST_CTL_CMD_DISABLE_EVSEL, EVLIST_CTL_CMD_ACK, EVLIST_CTL_CMD_SNAPSHOT, }; -- 2.26.2
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