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author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-09-05 21:56:18 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-09-05 21:56:18 +0300 |
commit | 27151f177827d478508e756c7657273261aaf8a9 (patch) | |
tree | 393ee6f1b12842c87461c471c0da70e4ecd93da8 /tools/perf/bench/evlist-open-close.c | |
parent | 58ca24158758f1784400d32743373d7d6227d018 (diff) | |
parent | c7a3828d98db2730079265b5f51933dfcef8bb5f (diff) | |
download | linux-27151f177827d478508e756c7657273261aaf8a9.tar.xz |
Merge tag 'perf-tools-for-v5.15-2021-09-04' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux
Pull perf tool updates from Arnaldo Carvalho de Melo:
"New features:
- Improvements for the flamegraph python script, including:
- Display perf.data header
- Display PIDs of user stacks
- Added option to change color scheme
- Default to blue/green color scheme to improve accessibility
- Correctly identify kernel stacks when debuginfo is available
- Improvements for 'perf bench futex':
- Add --mlockall parameter
- Add --broadcast and --pi to the 'requeue' sub benchmark
- Add support for PMU aliases.
- Introduce an ARM Coresight ETE decoder.
- Add a 'perf bench' entry for evlist open/close operations, to help
quantify improvements with multithreading 'perf record'.
- Allow reporting the [un]throttle PERF_RECORD_ meta event in 'perf
script's python scripting.
- Add a 'perf test' entry for PMU aliases.
- Add a 'perf test' entry for 'perf record/perf report/perf script'
pipe mode.
Fixes:
- perf script dlfilter (API for filtering via dynamically loaded
shared object introduced in v5.14) fixes and a 'perf test' entry
for it.
- Fix get_current_dir_name() compilation on Android.
- Fix issues with asciidoc and double dashes uses.
- Fix memory leaks in the BTF handling code.
- Fix leftover problems in the Documentation from the infrastructure
originally lifted from the git codebase.
- Fix *probe_vfs_getname.sh 'perf test' failures.
- Handle fd gaps in 'perf test's test__dso_data_reopen().
- Make sure to show disasembly warnings for 'perf annotate --stdio'.
- Fix output from pipe to file and vice-versa in 'perf
record/report/script'.
- Correct 'perf data -h' output.
- Fix wrong comm in system-wide mode with 'perf record --delay'.
- Do not allow --for-each-cgroup without cpu in 'perf stat'
- Make 'perf test --skip' work on shell tests.
- Fix libperf's verbose printing.
Misc improvements:
- Preparatory patches for multithreading various 'perf record' phases
(synthesizing, opening, recording, etc).
- Add sparse context/locking annotations in compiler-types.h, also to
help with the multithreading effort.
- Optimize the generation of the arch specific erno tables used in
'perf trace'.
- Optimize libperf's perf_cpu_map__max().
- Improve ARM's CoreSight warnings.
- Report collisions in AUX records.
- Improve warnings for the LLVM 'perf test' entry.
- Improve the PMU events 'perf test' codebase.
- perf test: Do not compare overheads in the zstd comp test
- Better support annotation on ARM.
- Update 'perf trace's cmd string table to decode sys_bpf() first
arg.
Vendor events:
- Add JSON events and metrics for Intel's Ice Lake, Tiger Lake and
Elhart Lake.
- Update JSON eventsand metrics for Intel's Cascade Lake and Sky Lake
servers.
Hardware tracing:
- Improvements for the ARM hardware tracing auxtrace support"
* tag 'perf-tools-for-v5.15-2021-09-04' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux: (130 commits)
perf tests: Add test for PMU aliases
perf pmu: Add PMU alias support
perf session: Report collisions in AUX records
perf script python: Allow reporting the [un]throttle PERF_RECORD_ meta event
perf build: Report failure for testing feature libopencsd
perf cs-etm: Show a warning for an unknown magic number
perf cs-etm: Print the decoder name
perf cs-etm: Create ETE decoder
perf cs-etm: Update OpenCSD decoder for ETE
perf cs-etm: Fix typo
perf cs-etm: Save TRCDEVARCH register
perf cs-etm: Refactor out ETMv4 header saving
perf cs-etm: Initialise architecture based on TRCIDR1
perf cs-etm: Refactor initialisation of decoder params.
tools build: Fix feature detect clean for out of source builds
perf evlist: Add evlist__for_each_entry_from() macro
perf evsel: Handle precise_ip fallback in evsel__open_cpu()
perf evsel: Move bpf_counter__install_pe() to success path in evsel__open_cpu()
perf evsel: Move test_attr__open() to success path in evsel__open_cpu()
perf evsel: Move ignore_missing_thread() to fallback code
...
Diffstat (limited to 'tools/perf/bench/evlist-open-close.c')
-rw-r--r-- | tools/perf/bench/evlist-open-close.c | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/tools/perf/bench/evlist-open-close.c b/tools/perf/bench/evlist-open-close.c new file mode 100644 index 000000000000..83e9897c64a1 --- /dev/null +++ b/tools/perf/bench/evlist-open-close.c @@ -0,0 +1,258 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <inttypes.h> +#include <stdio.h> +#include <stdlib.h> +#include <limits.h> +#include "bench.h" +#include "../util/debug.h" +#include "../util/stat.h" +#include "../util/evlist.h" +#include "../util/evsel.h" +#include "../util/strbuf.h" +#include "../util/record.h" +#include "../util/parse-events.h" +#include "internal/threadmap.h" +#include "internal/cpumap.h" +#include <linux/perf_event.h> +#include <linux/kernel.h> +#include <linux/time64.h> +#include <linux/string.h> +#include <subcmd/parse-options.h> + +#define MMAP_FLUSH_DEFAULT 1 + +static int iterations = 100; +static int nr_events = 1; +static const char *event_string = "dummy"; + +static struct record_opts opts = { + .sample_time = true, + .mmap_pages = UINT_MAX, + .user_freq = UINT_MAX, + .user_interval = ULLONG_MAX, + .freq = 4000, + .target = { + .uses_mmap = true, + .default_per_cpu = true, + }, + .mmap_flush = MMAP_FLUSH_DEFAULT, + .nr_threads_synthesize = 1, + .ctl_fd = -1, + .ctl_fd_ack = -1, +}; + +static const struct option options[] = { + OPT_STRING('e', "event", &event_string, "event", "event selector. use 'perf list' to list available events"), + OPT_INTEGER('n', "nr-events", &nr_events, + "number of dummy events to create (default 1). If used with -e, it clones those events n times (1 = no change)"), + OPT_INTEGER('i', "iterations", &iterations, "Number of iterations used to compute average (default=100)"), + OPT_BOOLEAN('a', "all-cpus", &opts.target.system_wide, "system-wide collection from all CPUs"), + OPT_STRING('C', "cpu", &opts.target.cpu_list, "cpu", "list of cpus where to open events"), + OPT_STRING('p', "pid", &opts.target.pid, "pid", "record events on existing process id"), + OPT_STRING('t', "tid", &opts.target.tid, "tid", "record events on existing thread id"), + OPT_STRING('u', "uid", &opts.target.uid_str, "user", "user to profile"), + OPT_BOOLEAN(0, "per-thread", &opts.target.per_thread, "use per-thread mmaps"), + OPT_END() +}; + +static const char *const bench_usage[] = { + "perf bench internals evlist-open-close <options>", + NULL +}; + +static int evlist__count_evsel_fds(struct evlist *evlist) +{ + struct evsel *evsel; + int cnt = 0; + + evlist__for_each_entry(evlist, evsel) + cnt += evsel->core.threads->nr * evsel->core.cpus->nr; + + return cnt; +} + +static struct evlist *bench__create_evlist(char *evstr) +{ + struct parse_events_error err = { .idx = 0, }; + struct evlist *evlist = evlist__new(); + int ret; + + if (!evlist) { + pr_err("Not enough memory to create evlist\n"); + return NULL; + } + + ret = parse_events(evlist, evstr, &err); + if (ret) { + parse_events_print_error(&err, evstr); + pr_err("Run 'perf list' for a list of valid events\n"); + ret = 1; + goto out_delete_evlist; + } + + ret = evlist__create_maps(evlist, &opts.target); + if (ret < 0) { + pr_err("Not enough memory to create thread/cpu maps\n"); + goto out_delete_evlist; + } + + evlist__config(evlist, &opts, NULL); + + return evlist; + +out_delete_evlist: + evlist__delete(evlist); + return NULL; +} + +static int bench__do_evlist_open_close(struct evlist *evlist) +{ + char sbuf[STRERR_BUFSIZE]; + int err = evlist__open(evlist); + + if (err < 0) { + pr_err("evlist__open: %s\n", str_error_r(errno, sbuf, sizeof(sbuf))); + return err; + } + + err = evlist__mmap(evlist, opts.mmap_pages); + if (err < 0) { + pr_err("evlist__mmap: %s\n", str_error_r(errno, sbuf, sizeof(sbuf))); + return err; + } + + evlist__enable(evlist); + evlist__disable(evlist); + evlist__munmap(evlist); + evlist__close(evlist); + + return 0; +} + +static int bench_evlist_open_close__run(char *evstr) +{ + // used to print statistics only + struct evlist *evlist = bench__create_evlist(evstr); + double time_average, time_stddev; + struct timeval start, end, diff; + struct stats time_stats; + u64 runtime_us; + int i, err; + + if (!evlist) + return -ENOMEM; + + init_stats(&time_stats); + + printf(" Number of cpus:\t%d\n", evlist->core.cpus->nr); + printf(" Number of threads:\t%d\n", evlist->core.threads->nr); + printf(" Number of events:\t%d (%d fds)\n", + evlist->core.nr_entries, evlist__count_evsel_fds(evlist)); + printf(" Number of iterations:\t%d\n", iterations); + + evlist__delete(evlist); + + for (i = 0; i < iterations; i++) { + pr_debug("Started iteration %d\n", i); + evlist = bench__create_evlist(evstr); + if (!evlist) + return -ENOMEM; + + gettimeofday(&start, NULL); + err = bench__do_evlist_open_close(evlist); + if (err) { + evlist__delete(evlist); + return err; + } + + gettimeofday(&end, NULL); + timersub(&end, &start, &diff); + runtime_us = diff.tv_sec * USEC_PER_SEC + diff.tv_usec; + update_stats(&time_stats, runtime_us); + + evlist__delete(evlist); + pr_debug("Iteration %d took:\t%" PRIu64 "us\n", i, runtime_us); + } + + time_average = avg_stats(&time_stats); + time_stddev = stddev_stats(&time_stats); + printf(" Average open-close took: %.3f usec (+- %.3f usec)\n", time_average, time_stddev); + + return 0; +} + +static char *bench__repeat_event_string(const char *evstr, int n) +{ + char sbuf[STRERR_BUFSIZE]; + struct strbuf buf; + int i, str_size = strlen(evstr), + final_size = str_size * n + n, + err = strbuf_init(&buf, final_size); + + if (err) { + pr_err("strbuf_init: %s\n", str_error_r(err, sbuf, sizeof(sbuf))); + goto out_error; + } + + for (i = 0; i < n; i++) { + err = strbuf_add(&buf, evstr, str_size); + if (err) { + pr_err("strbuf_add: %s\n", str_error_r(err, sbuf, sizeof(sbuf))); + goto out_error; + } + + err = strbuf_addch(&buf, i == n-1 ? '\0' : ','); + if (err) { + pr_err("strbuf_addch: %s\n", str_error_r(err, sbuf, sizeof(sbuf))); + goto out_error; + } + } + + return strbuf_detach(&buf, NULL); + +out_error: + strbuf_release(&buf); + return NULL; +} + + +int bench_evlist_open_close(int argc, const char **argv) +{ + char *evstr, errbuf[BUFSIZ]; + int err; + + argc = parse_options(argc, argv, options, bench_usage, 0); + if (argc) { + usage_with_options(bench_usage, options); + exit(EXIT_FAILURE); + } + + err = target__validate(&opts.target); + if (err) { + target__strerror(&opts.target, err, errbuf, sizeof(errbuf)); + pr_err("%s\n", errbuf); + goto out; + } + + err = target__parse_uid(&opts.target); + if (err) { + target__strerror(&opts.target, err, errbuf, sizeof(errbuf)); + pr_err("%s", errbuf); + goto out; + } + + /* Enable ignoring missing threads when -u/-p option is defined. */ + opts.ignore_missing_thread = opts.target.uid != UINT_MAX || opts.target.pid; + + evstr = bench__repeat_event_string(event_string, nr_events); + if (!evstr) { + err = -ENOMEM; + goto out; + } + + err = bench_evlist_open_close__run(evstr); + + free(evstr); +out: + return err; +} |