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Date: Wed, 1 Nov 2017 05:53:27 +0000 From: Wang Nan <wangnan0@...wei.com> To: <linux-kernel@...r.kernel.org>, <kan.liang@...el.com>, <acme@...nel.org>, <jolsa@...hat.com>, <namhyung@...nel.org> CC: Wang Nan <wangnan0@...wei.com> Subject: [PATCH 2/2] perf record: Replace 'overwrite' by 'flightrecorder' for better naming The meaning of perf record's "overwrite" option and many "overwrite" in source code are not clear. In perf's code, the 'overwrite' has 2 meanings: 1. Make ringbuffer readonly (perf_evlist__mmap_ex's argument). 2. Set evsel's "backward" attribute (in apply_config_terms). perf record doesn't use meaning 1 at all, but have a overwrite option, its real meaning is setting backward. This patch separates these two concepts, introduce 'flightrecorder' mode which is what we really want. It combines these 2 concept together, wraps them into a record mode. In flight recorder mode, perf only dumps data before something happen. Signed-off-by: Wang Nan <wangnan0@...wei.com> --- tools/perf/Documentation/perf-record.txt | 8 ++++---- tools/perf/builtin-record.c | 4 ++-- tools/perf/perf.h | 2 +- tools/perf/util/evsel.c | 6 +++--- tools/perf/util/evsel.h | 4 ++-- tools/perf/util/parse-events.c | 20 ++++++++++---------- tools/perf/util/parse-events.h | 4 ++-- tools/perf/util/parse-events.l | 4 ++-- 8 files changed, 26 insertions(+), 26 deletions(-) diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 5a626ef..463c2d3 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -467,19 +467,19 @@ the beginning of record, collect them during finalizing an output file. The collected non-sample events reflects the status of the system when record is finished. ---overwrite:: +--flight-recorder:: Makes all events use an overwritable ring buffer. An overwritable ring buffer works like a flight recorder: when it gets full, the kernel will overwrite the oldest records, that thus will never make it to the perf.data file. -When '--overwrite' and '--switch-output' are used perf records and drops +When '--flight-recorder' and '--switch-output' are used perf records and drops events until it receives a signal, meaning that something unusual was detected that warrants taking a snapshot of the most current events, those fitting in the ring buffer at that moment. -'overwrite' attribute can also be set or canceled for an event using -config terms. For example: 'cycles/overwrite/' and 'instructions/no-overwrite/'. +'flightrecorder' attribute can also be set or canceled separately for an event using +config terms. For example: 'cycles/flightrecorder/' and 'instructions/no-flightrecorder/'. Implies --tail-synthesize. diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index f4d9fc5..315ea09 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -1489,7 +1489,7 @@ static struct option __record_options[] = { "child tasks do not inherit counters"), OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize, "synthesize non-sample events at the end of output"), - OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"), + OPT_BOOLEAN(0, "flight-recoder", &record.opts.flight_recorder, "use flight recoder mode"), OPT_UINTEGER('F', "freq", &record.opts.user_freq, "profile at this frequency"), OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]", "number of mmap data pages and AUX area tracing mmap pages", @@ -1733,7 +1733,7 @@ int cmd_record(int argc, const char **argv) } } - if (record.opts.overwrite) + if (record.opts.flight_recorder) record.opts.tail_synthesize = true; if (rec->evlist->nr_entries == 0 && diff --git a/tools/perf/perf.h b/tools/perf/perf.h index fbb0a9c..a7f7618 100644 --- a/tools/perf/perf.h +++ b/tools/perf/perf.h @@ -57,7 +57,7 @@ struct record_opts { bool all_kernel; bool all_user; bool tail_synthesize; - bool overwrite; + bool flight_recorder; bool ignore_missing_thread; unsigned int freq; unsigned int mmap_pages; diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index f894893..0e1e8e8 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -772,8 +772,8 @@ static void apply_config_terms(struct perf_evsel *evsel, */ attr->inherit = term->val.inherit ? 1 : 0; break; - case PERF_EVSEL__CONFIG_TERM_OVERWRITE: - attr->write_backward = term->val.overwrite ? 1 : 0; + case PERF_EVSEL__CONFIG_TERM_FLIGHTRECORDER: + attr->write_backward = term->val.flightrecorder ? 1 : 0; break; default: break; @@ -856,7 +856,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts, attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1; attr->inherit = !opts->no_inherit; - attr->write_backward = opts->overwrite ? 1 : 0; + attr->write_backward = opts->flight_recorder ? 1 : 0; perf_evsel__set_sample_bit(evsel, IP); perf_evsel__set_sample_bit(evsel, TID); diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h index 64782b1..115b637 100644 --- a/tools/perf/util/evsel.h +++ b/tools/perf/util/evsel.h @@ -45,7 +45,7 @@ enum { PERF_EVSEL__CONFIG_TERM_STACK_USER, PERF_EVSEL__CONFIG_TERM_INHERIT, PERF_EVSEL__CONFIG_TERM_MAX_STACK, - PERF_EVSEL__CONFIG_TERM_OVERWRITE, + PERF_EVSEL__CONFIG_TERM_FLIGHTRECORDER, PERF_EVSEL__CONFIG_TERM_DRV_CFG, PERF_EVSEL__CONFIG_TERM_BRANCH, PERF_EVSEL__CONFIG_TERM_MAX, @@ -63,7 +63,7 @@ struct perf_evsel_config_term { u64 stack_user; int max_stack; bool inherit; - bool overwrite; + bool flightrecorder; char *branch; } val; }; diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 04f35db..61ae3d3 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -914,8 +914,8 @@ 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", + [PARSE_EVENTS__TERM_TYPE_FLIGHTRECORDER] = "flightrecorder", + [PARSE_EVENTS__TERM_TYPE_NOFLIGHTRECORDER] = "no-flightrecorder", [PARSE_EVENTS__TERM_TYPE_DRV_CFG] = "driver-config", }; @@ -1013,10 +1013,10 @@ do { \ case PARSE_EVENTS__TERM_TYPE_NOINHERIT: CHECK_TYPE_VAL(NUM); break; - case PARSE_EVENTS__TERM_TYPE_OVERWRITE: + case PARSE_EVENTS__TERM_TYPE_FLIGHTRECORDER: CHECK_TYPE_VAL(NUM); break; - case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE: + case PARSE_EVENTS__TERM_TYPE_NOFLIGHTRECORDER: CHECK_TYPE_VAL(NUM); break; case PARSE_EVENTS__TERM_TYPE_NAME: @@ -1072,8 +1072,8 @@ 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: + case PARSE_EVENTS__TERM_TYPE_FLIGHTRECORDER: + case PARSE_EVENTS__TERM_TYPE_NOFLIGHTRECORDER: return config_term_common(attr, term, err); default: if (err) { @@ -1149,11 +1149,11 @@ 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); + case PARSE_EVENTS__TERM_TYPE_FLIGHTRECORDER: + ADD_CONFIG_TERM(FLIGHTRECORDER, flightrecorder, term->val.num ? 1 : 0); break; - case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE: - ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 0 : 1); + case PARSE_EVENTS__TERM_TYPE_NOFLIGHTRECORDER: + ADD_CONFIG_TERM(FLIGHTRECORDER, flightrecorder, term->val.num ? 0 : 1); break; case PARSE_EVENTS__TERM_TYPE_DRV_CFG: ADD_CONFIG_TERM(DRV_CFG, drv_cfg, term->val.str); diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index 3909ca0..cd0b4eae 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -70,8 +70,8 @@ enum { PARSE_EVENTS__TERM_TYPE_NOINHERIT, PARSE_EVENTS__TERM_TYPE_INHERIT, PARSE_EVENTS__TERM_TYPE_MAX_STACK, - PARSE_EVENTS__TERM_TYPE_NOOVERWRITE, - PARSE_EVENTS__TERM_TYPE_OVERWRITE, + PARSE_EVENTS__TERM_TYPE_NOFLIGHTRECORDER, + PARSE_EVENTS__TERM_TYPE_FLIGHTRECORDER, PARSE_EVENTS__TERM_TYPE_DRV_CFG, __PARSE_EVENTS__TERM_TYPE_NR, }; diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l index 38a42bd..7710d6d 100644 --- a/tools/perf/util/parse-events.l +++ b/tools/perf/util/parse-events.l @@ -251,8 +251,8 @@ stack-size { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_STACKSIZE); } max-stack { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_MAX_STACK); } inherit { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_INHERIT); } no-inherit { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_NOINHERIT); } -overwrite { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_OVERWRITE); } -no-overwrite { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_NOOVERWRITE); } +flightrecorder { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_FLIGHTRECORDER); } +no-flightrecorder { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_NOFLIGHTRECORDER); } , { return ','; } "/" { BEGIN(INITIAL); return '/'; } {name_minus} { return str(yyscanner, PE_NAME); } -- 2.10.1
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