From 626a6b784e91bc61ca9fe0f9dd5bb60cb91ccb6b Mon Sep 17 00:00:00 2001 From: Wang Nan Date: Thu, 14 Jul 2016 08:34:45 +0000 Subject: perf tools: Enable overwrite settings This patch allows following config terms and option: Globally setting events to overwrite; # perf record --overwrite ... Set specific events to be overwrite or no-overwrite. # perf record --event cycles/overwrite/ ... # perf record --event cycles/no-overwrite/ ... Add missing config terms and update the config term array size because the longest string length has changed. For overwritable events, it automatically selects attr.write_backward since perf requires it to be backward for reading. Test result: # perf record --overwrite -e syscalls:*enter_nanosleep* usleep 1 [ perf record: Woken up 2 times to write data ] [ perf record: Captured and wrote 0.011 MB perf.data (1 samples) ] # perf evlist -v syscalls:sys_enter_nanosleep: type: 2, size: 112, config: 0x134, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU|PERIOD|RAW, disabled: 1, inherit: 1, mmap: 1, comm: 1, enable_on_exec: 1, task: 1, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1, write_backward: 1 # Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events Signed-off-by: Wang Nan Tested-by: Arnaldo Carvalho de Melo Acked-by: Jiri Olsa Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Nilay Vaish Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1468485287-33422-14-git-send-email-wangnan0@huawei.com Signed-off-by: He Kuang Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/parse-events.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) (limited to 'tools/perf/util/parse-events.c') diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 375af0e..6c913c3 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -902,6 +902,8 @@ static const char *config_term_names[__PARSE_EVENTS__TERM_TYPE_NR] = { [PARSE_EVENTS__TERM_TYPE_NOINHERIT] = "no-inherit", [PARSE_EVENTS__TERM_TYPE_INHERIT] = "inherit", [PARSE_EVENTS__TERM_TYPE_MAX_STACK] = "max-stack", + [PARSE_EVENTS__TERM_TYPE_OVERWRITE] = "overwrite", + [PARSE_EVENTS__TERM_TYPE_NOOVERWRITE] = "no-overwrite", }; static bool config_term_shrinked; @@ -994,6 +996,12 @@ do { \ case PARSE_EVENTS__TERM_TYPE_NOINHERIT: CHECK_TYPE_VAL(NUM); break; + case PARSE_EVENTS__TERM_TYPE_OVERWRITE: + CHECK_TYPE_VAL(NUM); + break; + case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE: + CHECK_TYPE_VAL(NUM); + break; case PARSE_EVENTS__TERM_TYPE_NAME: CHECK_TYPE_VAL(STR); break; @@ -1046,6 +1054,8 @@ static int config_term_tracepoint(struct perf_event_attr *attr, case PARSE_EVENTS__TERM_TYPE_INHERIT: case PARSE_EVENTS__TERM_TYPE_NOINHERIT: case PARSE_EVENTS__TERM_TYPE_MAX_STACK: + case PARSE_EVENTS__TERM_TYPE_OVERWRITE: + case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE: return config_term_common(attr, term, err); default: if (err) { @@ -1118,6 +1128,12 @@ do { \ case PARSE_EVENTS__TERM_TYPE_MAX_STACK: ADD_CONFIG_TERM(MAX_STACK, max_stack, term->val.num); break; + case PARSE_EVENTS__TERM_TYPE_OVERWRITE: + ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 1 : 0); + break; + case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE: + ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 0 : 1); + break; default: break; } @@ -2412,9 +2428,9 @@ static void config_terms_list(char *buf, size_t buf_sz) char *parse_events_formats_error_string(char *additional_terms) { char *str; - /* "branch_type" is the longest name */ + /* "no-overwrite" is the longest name */ char static_terms[__PARSE_EVENTS__TERM_TYPE_NR * - (sizeof("branch_type") - 1)]; + (sizeof("no-overwrite") - 1)]; config_terms_list(static_terms, sizeof(static_terms)); /* valid terms */ -- cgit v1.1