From d1e325cf40fec5fec9b18aa2b537de7e3680ef6c Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Wed, 5 Aug 2020 11:34:40 +0200 Subject: perf header: Store clock references for -k/--clockid option MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a new CLOCK_DATA feature that stores reference times when -k/--clockid option is specified. It contains the clock id and its reference time together with wall clock time taken at the 'same time', both values are in nanoseconds. The format of data is as below: struct { u32 version; /* version = 1 */ u32 clockid; u64 wall_clock_ns; u64 clockid_time_ns; }; This clock reference times will be used in following changes to display wall clock for perf events. It's available only for recording with clockid specified, because it's the only case where we can get reference time to wallclock time. It's can't do that with perf clock yet. Committer testing: $ perf record -h -k Usage: perf record [] [] or: perf record [] -- [] -k, --clockid clockid to use for events, see clock_gettime() $ perf record -k monotonic sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.017 MB perf.data (8 samples) ] $ perf report --header-only | grep clockid -A1 # event : name = cycles:u, , id = { 88815, 88816, 88817, 88818, 88819, 88820, 88821, 88822 }, size = 120, { sample_period, sample_freq } = 4000, sample_type = IP|TID|TIME|PERIOD, read_format = ID, disabled = 1, inherit = 1, exclude_kernel = 1, mmap = 1, comm = 1, freq = 1, enable_on_exec = 1, task = 1, precise_ip = 3, sample_id_all = 1, exclude_guest = 1, mmap2 = 1, comm_exec = 1, use_clockid = 1, ksymbol = 1, bpf_event = 1, clockid = 1 # CPU_TOPOLOGY info available, use -I to display -- # clockid frequency: 1000 MHz # cpu pmu capabilities: branches=32, max_precise=3, pmu_name=skylake # clockid: monotonic (1) # reference time: 2020-08-06 09:40:21.619290 = 1596717621.619290 (TOD) = 21931.077673635 (monotonic) $ Original-patch-by: David Ahern Signed-off-by: Jiri Olsa Tested-by: Arnaldo Carvalho de Melo Cc: Alexander Shishkin Cc: Andi Kleen Cc: David Ahern Cc: Geneviève Bastien Cc: Ian Rogers Cc: Jeremie Galarneau Cc: Michael Petlan Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Wang Nan Link: http://lore.kernel.org/lkml/20200805093444.314999-4-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf.data-file-format.txt | 13 +++ tools/perf/builtin-record.c | 41 ++++++++ tools/perf/util/env.h | 12 +++ tools/perf/util/header.c | 113 +++++++++++++++++++++ tools/perf/util/header.h | 1 + 5 files changed, 180 insertions(+) diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt index b6472e463284..9ee96640744e 100644 --- a/tools/perf/Documentation/perf.data-file-format.txt +++ b/tools/perf/Documentation/perf.data-file-format.txt @@ -389,6 +389,19 @@ struct { Example: cpu pmu capabilities: branches=32, max_precise=3, pmu_name=icelake + HEADER_CLOCK_DATA = 29, + + Contains clock id and its reference time together with wall clock + time taken at the 'same time', both values are in nanoseconds. + The format of data is as below. + +struct { + u32 version; /* version = 1 */ + u32 clockid; + u64 wall_clock_ns; + u64 clockid_time_ns; +}; + other bits are reserved and should ignored for now HEADER_FEAT_BITS = 256, diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index c9a07a1a75af..b21a8769db21 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -71,6 +71,7 @@ #include #include #include +#include struct switch_output { bool enabled; @@ -1204,6 +1205,9 @@ static void record__init_features(struct record *rec) if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns)) perf_header__clear_feat(&session->header, HEADER_CLOCKID); + if (!rec->opts.use_clockid) + perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA); + perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT); if (!record__comp_enabled(rec)) perf_header__clear_feat(&session->header, HEADER_COMPRESSED); @@ -1552,6 +1556,40 @@ static int record__setup_sb_evlist(struct record *rec) return 0; } +static int record__init_clock(struct record *rec) +{ + struct perf_session *session = rec->session; + struct timespec ref_clockid; + struct timeval ref_tod; + u64 ref; + + if (!rec->opts.use_clockid) + return 0; + + session->header.env.clock.clockid = rec->opts.clockid; + + if (gettimeofday(&ref_tod, NULL) != 0) { + pr_err("gettimeofday failed, cannot set reference time.\n"); + return -1; + } + + if (clock_gettime(rec->opts.clockid, &ref_clockid)) { + pr_err("clock_gettime failed, cannot set reference time.\n"); + return -1; + } + + ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC + + (u64) ref_tod.tv_usec * NSEC_PER_USEC; + + session->header.env.clock.tod_ns = ref; + + ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC + + (u64) ref_clockid.tv_nsec; + + session->header.env.clock.clockid_ns = ref; + return 0; +} + static int __cmd_record(struct record *rec, int argc, const char **argv) { int err; @@ -1632,6 +1670,9 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) return -1; } + if (record__init_clock(rec)) + return -1; + record__init_features(rec); if (rec->opts.use_clockid && rec->opts.clockid_res_ns) diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h index 1ab2682d5d2b..7218f7db57af 100644 --- a/tools/perf/util/env.h +++ b/tools/perf/util/env.h @@ -100,6 +100,18 @@ struct perf_env { /* For fast cpu to numa node lookup via perf_env__numa_node */ int *numa_map; int nr_numa_map; + + /* For real clock time reference. */ + struct { + u64 tod_ns; + u64 clockid_ns; + int clockid; + /* + * enabled is valid for report mode, and is true if above + * values are set, it's set in process_clock_data + */ + bool enabled; + } clock; }; enum perf_compress_type { diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index 7a67d017d72c..eece94cf6f86 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -46,6 +46,7 @@ #include "util/util.h" // perf_exe() #include "cputopo.h" #include "bpf-event.h" +#include "clockid.h" #include #include @@ -895,6 +896,40 @@ static int write_clockid(struct feat_fd *ff, sizeof(ff->ph->env.clockid_res_ns)); } +static int write_clock_data(struct feat_fd *ff, + struct evlist *evlist __maybe_unused) +{ + u64 *data64; + u32 data32; + int ret; + + /* version */ + data32 = 1; + + ret = do_write(ff, &data32, sizeof(data32)); + if (ret < 0) + return ret; + + /* clockid */ + data32 = ff->ph->env.clock.clockid; + + ret = do_write(ff, &data32, sizeof(data32)); + if (ret < 0) + return ret; + + /* TOD ref time */ + data64 = &ff->ph->env.clock.tod_ns; + + ret = do_write(ff, data64, sizeof(*data64)); + if (ret < 0) + return ret; + + /* clockid ref time */ + data64 = &ff->ph->env.clock.clockid_ns; + + return do_write(ff, data64, sizeof(*data64)); +} + static int write_dir_format(struct feat_fd *ff, struct evlist *evlist __maybe_unused) { @@ -1549,6 +1584,49 @@ static void print_clockid(struct feat_fd *ff, FILE *fp) ff->ph->env.clockid_res_ns * 1000); } +static void print_clock_data(struct feat_fd *ff, FILE *fp) +{ + struct timespec clockid_ns; + char tstr[64], date[64]; + struct timeval tod_ns; + clockid_t clockid; + struct tm ltime; + u64 ref; + + if (!ff->ph->env.clock.enabled) { + fprintf(fp, "# reference time disabled\n"); + return; + } + + /* Compute TOD time. */ + ref = ff->ph->env.clock.tod_ns; + tod_ns.tv_sec = ref / NSEC_PER_SEC; + ref -= tod_ns.tv_sec * NSEC_PER_SEC; + tod_ns.tv_usec = ref / NSEC_PER_USEC; + + /* Compute clockid time. */ + ref = ff->ph->env.clock.clockid_ns; + clockid_ns.tv_sec = ref / NSEC_PER_SEC; + ref -= clockid_ns.tv_sec * NSEC_PER_SEC; + clockid_ns.tv_nsec = ref; + + clockid = ff->ph->env.clock.clockid; + + if (localtime_r(&tod_ns.tv_sec, <ime) == NULL) + snprintf(tstr, sizeof(tstr), ""); + else { + strftime(date, sizeof(date), "%F %T", <ime); + scnprintf(tstr, sizeof(tstr), "%s.%06d", + date, (int) tod_ns.tv_usec); + } + + fprintf(fp, "# clockid: %s (%u)\n", clockid_name(clockid), clockid); + fprintf(fp, "# reference time: %s = %ld.%06d (TOD) = %ld.%09ld (%s)\n", + tstr, tod_ns.tv_sec, (int) tod_ns.tv_usec, + clockid_ns.tv_sec, clockid_ns.tv_nsec, + clockid_name(clockid)); +} + static void print_dir_format(struct feat_fd *ff, FILE *fp) { struct perf_session *session; @@ -2738,6 +2816,40 @@ static int process_clockid(struct feat_fd *ff, return 0; } +static int process_clock_data(struct feat_fd *ff, + void *_data __maybe_unused) +{ + u32 data32; + u64 data64; + + /* version */ + if (do_read_u32(ff, &data32)) + return -1; + + if (data32 != 1) + return -1; + + /* clockid */ + if (do_read_u32(ff, &data32)) + return -1; + + ff->ph->env.clock.clockid = data32; + + /* TOD ref time */ + if (do_read_u64(ff, &data64)) + return -1; + + ff->ph->env.clock.tod_ns = data64; + + /* clockid ref time */ + if (do_read_u64(ff, &data64)) + return -1; + + ff->ph->env.clock.clockid_ns = data64; + ff->ph->env.clock.enabled = true; + return 0; +} + static int process_dir_format(struct feat_fd *ff, void *_data __maybe_unused) { @@ -3008,6 +3120,7 @@ const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE] = { FEAT_OPR(BPF_BTF, bpf_btf, false), FEAT_OPR(COMPRESSED, compressed, false), FEAT_OPR(CPU_PMU_CAPS, cpu_pmu_caps, false), + FEAT_OPR(CLOCK_DATA, clock_data, false), }; struct header_print_data { diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h index 650bd1c7a99b..2aca71763ecf 100644 --- a/tools/perf/util/header.h +++ b/tools/perf/util/header.h @@ -44,6 +44,7 @@ enum { HEADER_BPF_BTF, HEADER_COMPRESSED, HEADER_CPU_PMU_CAPS, + HEADER_CLOCK_DATA, HEADER_LAST_FEATURE, HEADER_FEAT_BITS = 256, }; -- cgit v1.2.3-59-g8ed1b