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perf bench: Add build-id injection benchmark
Sometimes I can see that 'perf record' piped with 'perf inject' take a
long time processing build-ids.
So introduce a inject-build-id benchmark to the internals benchmark
suite to measure its overhead regularly.
It runs the 'perf inject' command internally and feeds the given number
of synthesized events (MMAP2 + SAMPLE basically).
Usage: perf bench internals inject-build-id <options>
-i, --iterations <n> Number of iterations used to compute average (default: 100)
-m, --nr-mmaps <n> Number of mmap events for each iteration (default: 100)
-n, --nr-samples <n> Number of sample events per mmap event (default: 100)
-v, --verbose be more verbose (show iteration count, DSO name, etc)
By default, it measures average processing time of 100 MMAP2 events
and 10000 SAMPLE events. Below is a result on my laptop.
$ perf bench internals inject-build-id
# Running 'internals/inject-build-id' benchmark:
Average build-id injection took: 25.789 msec (+- 0.202 msec)
Average time per event: 2.528 usec (+- 0.020 usec)
Average memory usage: 8411 KB (+- 7 KB)
Committer testing:
$ perf bench
Usage:
perf bench [<common options>] <collection> <benchmark> [<options>]
# List of all available benchmark collections:
sched: Scheduler and IPC benchmarks
syscall: System call benchmarks
mem: Memory access benchmarks
numa: NUMA scheduling and MM benchmarks
futex: Futex stressing benchmarks
epoll: Epoll stressing benchmarks
internals: Perf-internals benchmarks
all: All benchmarks
$ perf bench internals
# List of available benchmarks for collection 'internals':
synthesize: Benchmark perf event synthesis
kallsyms-parse: Benchmark kallsyms parsing
inject-build-id: Benchmark build-id injection
$ perf bench internals inject-build-id
# Running 'internals/inject-build-id' benchmark:
Average build-id injection took: 14.202 msec (+- 0.059 msec)
Average time per event: 1.392 usec (+- 0.006 usec)
Average memory usage: 12650 KB (+- 10 KB)
Average build-id-all injection took: 12.831 msec (+- 0.071 msec)
Average time per event: 1.258 usec (+- 0.007 usec)
Average memory usage: 11895 KB (+- 10 KB)
$
$ perf stat -r5 perf bench internals inject-build-id
# Running 'internals/inject-build-id' benchmark:
Average build-id injection took: 14.380 msec (+- 0.056 msec)
Average time per event: 1.410 usec (+- 0.006 usec)
Average memory usage: 12608 KB (+- 11 KB)
Average build-id-all injection took: 11.889 msec (+- 0.064 msec)
Average time per event: 1.166 usec (+- 0.006 usec)
Average memory usage: 11838 KB (+- 10 KB)
# Running 'internals/inject-build-id' benchmark:
Average build-id injection took: 14.246 msec (+- 0.065 msec)
Average time per event: 1.397 usec (+- 0.006 usec)
Average memory usage: 12744 KB (+- 10 KB)
Average build-id-all injection took: 12.019 msec (+- 0.066 msec)
Average time per event: 1.178 usec (+- 0.006 usec)
Average memory usage: 11963 KB (+- 10 KB)
# Running 'internals/inject-build-id' benchmark:
Average build-id injection took: 14.321 msec (+- 0.067 msec)
Average time per event: 1.404 usec (+- 0.007 usec)
Average memory usage: 12690 KB (+- 10 KB)
Average build-id-all injection took: 11.909 msec (+- 0.041 msec)
Average time per event: 1.168 usec (+- 0.004 usec)
Average memory usage: 11938 KB (+- 10 KB)
# Running 'internals/inject-build-id' benchmark:
Average build-id injection took: 14.287 msec (+- 0.059 msec)
Average time per event: 1.401 usec (+- 0.006 usec)
Average memory usage: 12864 KB (+- 10 KB)
Average build-id-all injection took: 11.862 msec (+- 0.058 msec)
Average time per event: 1.163 usec (+- 0.006 usec)
Average memory usage: 12103 KB (+- 10 KB)
# Running 'internals/inject-build-id' benchmark:
Average build-id injection took: 14.402 msec (+- 0.053 msec)
Average time per event: 1.412 usec (+- 0.005 usec)
Average memory usage: 12876 KB (+- 10 KB)
Average build-id-all injection took: 11.826 msec (+- 0.061 msec)
Average time per event: 1.159 usec (+- 0.006 usec)
Average memory usage: 12111 KB (+- 10 KB)
Performance counter stats for 'perf bench internals inject-build-id' (5 runs):
4,267.48 msec task-clock:u # 1.502 CPUs utilized ( +- 0.14% )
0 context-switches:u # 0.000 K/sec
0 cpu-migrations:u # 0.000 K/sec
102,092 page-faults:u # 0.024 M/sec ( +- 0.08% )
3,894,589,578 cycles:u # 0.913 GHz ( +- 0.19% ) (83.49%)
140,078,421 stalled-cycles-frontend:u # 3.60% frontend cycles idle ( +- 0.77% ) (83.34%)
948,581,189 stalled-cycles-backend:u # 24.36% backend cycles idle ( +- 0.46% ) (83.25%)
5,835,587,719 instructions:u # 1.50 insn per cycle
# 0.16 stalled cycles per insn ( +- 0.21% ) (83.24%)
1,267,423,636 branches:u # 296.996 M/sec ( +- 0.22% ) (83.12%)
17,484,290 branch-misses:u # 1.38% of all branches ( +- 0.12% ) (83.55%)
2.84176 +- 0.00222 seconds time elapsed ( +- 0.08% )
$
Acked-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20201012070214.2074921-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim
Arnaldo Carvalho de Melo
parent
388968d864
commit
0bf02a0d80
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@ -12,6 +12,7 @@ perf-y += epoll-ctl.o
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perf-y += synthesize.o
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perf-y += kallsyms-parse.o
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perf-y += find-bit-bench.o
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perf-y += inject-buildid.o
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perf-$(CONFIG_X86_64) += mem-memcpy-x86-64-lib.o
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perf-$(CONFIG_X86_64) += mem-memcpy-x86-64-asm.o
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@ -47,6 +47,7 @@ int bench_epoll_wait(int argc, const char **argv);
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int bench_epoll_ctl(int argc, const char **argv);
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int bench_synthesize(int argc, const char **argv);
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int bench_kallsyms_parse(int argc, const char **argv);
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int bench_inject_build_id(int argc, const char **argv);
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#define BENCH_FORMAT_DEFAULT_STR "default"
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#define BENCH_FORMAT_DEFAULT 0
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460
tools/perf/bench/inject-buildid.c
Normal file
460
tools/perf/bench/inject-buildid.c
Normal file
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@ -0,0 +1,460 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <stdlib.h>
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#include <stddef.h>
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#include <ftw.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <pthread.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include <linux/kernel.h>
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#include <linux/time64.h>
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#include <linux/list.h>
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#include <linux/err.h>
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#include <internal/lib.h>
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#include <subcmd/parse-options.h>
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#include "bench.h"
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#include "util/data.h"
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#include "util/stat.h"
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#include "util/debug.h"
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#include "util/event.h"
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#include "util/symbol.h"
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#include "util/session.h"
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#include "util/build-id.h"
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#include "util/synthetic-events.h"
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#define MMAP_DEV_MAJOR 8
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#define DSO_MMAP_RATIO 4
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static unsigned int iterations = 100;
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static unsigned int nr_mmaps = 100;
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static unsigned int nr_samples = 100; /* samples per mmap */
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static u64 bench_sample_type;
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static u16 bench_id_hdr_size;
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struct bench_data {
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int pid;
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int input_pipe[2];
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int output_pipe[2];
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pthread_t th;
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};
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struct bench_dso {
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struct list_head list;
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char *name;
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int ino;
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};
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static int nr_dsos;
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static struct bench_dso *dsos;
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extern int cmd_inject(int argc, const char *argv[]);
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static const struct option options[] = {
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OPT_UINTEGER('i', "iterations", &iterations,
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"Number of iterations used to compute average (default: 100)"),
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OPT_UINTEGER('m', "nr-mmaps", &nr_mmaps,
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"Number of mmap events for each iteration (default: 100)"),
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OPT_UINTEGER('n', "nr-samples", &nr_samples,
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"Number of sample events per mmap event (default: 100)"),
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OPT_INCR('v', "verbose", &verbose,
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"be more verbose (show iteration count, DSO name, etc)"),
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OPT_END()
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};
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static const char *const bench_usage[] = {
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"perf bench internals inject-build-id <options>",
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NULL
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};
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/*
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* Helper for collect_dso that adds the given file as a dso to dso_list
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* if it contains a build-id. Stops after collecting 4 times more than
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* we need (for MMAP2 events).
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*/
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static int add_dso(const char *fpath, const struct stat *sb __maybe_unused,
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int typeflag, struct FTW *ftwbuf __maybe_unused)
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{
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struct bench_dso *dso = &dsos[nr_dsos];
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unsigned char build_id[BUILD_ID_SIZE];
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if (typeflag == FTW_D || typeflag == FTW_SL)
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return 0;
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if (filename__read_build_id(fpath, build_id, BUILD_ID_SIZE) < 0)
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return 0;
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dso->name = realpath(fpath, NULL);
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if (dso->name == NULL)
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return -1;
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dso->ino = nr_dsos++;
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pr_debug2(" Adding DSO: %s\n", fpath);
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/* stop if we collected enough DSOs */
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if ((unsigned int)nr_dsos == DSO_MMAP_RATIO * nr_mmaps)
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return 1;
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return 0;
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}
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static void collect_dso(void)
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{
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dsos = calloc(nr_mmaps * DSO_MMAP_RATIO, sizeof(*dsos));
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if (dsos == NULL) {
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printf(" Memory allocation failed\n");
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exit(1);
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}
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if (nftw("/usr/lib/", add_dso, 10, FTW_PHYS) < 0)
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return;
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pr_debug(" Collected %d DSOs\n", nr_dsos);
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}
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static void release_dso(void)
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{
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int i;
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for (i = 0; i < nr_dsos; i++) {
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struct bench_dso *dso = &dsos[i];
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free(dso->name);
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}
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free(dsos);
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}
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/* Fake address used by mmap and sample events */
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static u64 dso_map_addr(struct bench_dso *dso)
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{
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return 0x400000ULL + dso->ino * 8192ULL;
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}
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static u32 synthesize_attr(struct bench_data *data)
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{
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union perf_event event;
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memset(&event, 0, sizeof(event.attr) + sizeof(u64));
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event.header.type = PERF_RECORD_HEADER_ATTR;
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event.header.size = sizeof(event.attr) + sizeof(u64);
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event.attr.attr.type = PERF_TYPE_SOFTWARE;
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event.attr.attr.config = PERF_COUNT_SW_TASK_CLOCK;
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event.attr.attr.exclude_kernel = 1;
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event.attr.attr.sample_id_all = 1;
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event.attr.attr.sample_type = bench_sample_type;
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return writen(data->input_pipe[1], &event, event.header.size);
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}
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static u32 synthesize_fork(struct bench_data *data)
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{
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union perf_event event;
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memset(&event, 0, sizeof(event.fork) + bench_id_hdr_size);
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event.header.type = PERF_RECORD_FORK;
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event.header.misc = PERF_RECORD_MISC_FORK_EXEC;
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event.header.size = sizeof(event.fork) + bench_id_hdr_size;
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event.fork.ppid = 1;
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event.fork.ptid = 1;
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event.fork.pid = data->pid;
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event.fork.tid = data->pid;
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return writen(data->input_pipe[1], &event, event.header.size);
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}
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static u32 synthesize_mmap(struct bench_data *data, struct bench_dso *dso,
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u64 timestamp)
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{
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union perf_event event;
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size_t len = offsetof(struct perf_record_mmap2, filename);
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u64 *id_hdr_ptr = (void *)&event;
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int ts_idx;
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len += roundup(strlen(dso->name) + 1, 8) + bench_id_hdr_size;
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memset(&event, 0, min(len, sizeof(event.mmap2)));
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event.header.type = PERF_RECORD_MMAP2;
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event.header.misc = PERF_RECORD_MISC_USER;
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event.header.size = len;
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event.mmap2.pid = data->pid;
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event.mmap2.tid = data->pid;
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event.mmap2.maj = MMAP_DEV_MAJOR;
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event.mmap2.ino = dso->ino;
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strcpy(event.mmap2.filename, dso->name);
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event.mmap2.start = dso_map_addr(dso);
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event.mmap2.len = 4096;
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event.mmap2.prot = PROT_EXEC;
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if (len > sizeof(event.mmap2)) {
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/* write mmap2 event first */
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writen(data->input_pipe[1], &event, len - bench_id_hdr_size);
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/* zero-fill sample id header */
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memset(id_hdr_ptr, 0, bench_id_hdr_size);
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/* put timestamp in the right position */
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ts_idx = (bench_id_hdr_size / sizeof(u64)) - 2;
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id_hdr_ptr[ts_idx] = timestamp;
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writen(data->input_pipe[1], id_hdr_ptr, bench_id_hdr_size);
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} else {
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ts_idx = (len / sizeof(u64)) - 2;
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id_hdr_ptr[ts_idx] = timestamp;
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writen(data->input_pipe[1], &event, len);
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}
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return len;
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}
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static u32 synthesize_sample(struct bench_data *data, struct bench_dso *dso,
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u64 timestamp)
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{
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union perf_event event;
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struct perf_sample sample = {
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.tid = data->pid,
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.pid = data->pid,
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.ip = dso_map_addr(dso),
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.time = timestamp,
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};
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event.header.type = PERF_RECORD_SAMPLE;
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event.header.misc = PERF_RECORD_MISC_USER;
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event.header.size = perf_event__sample_event_size(&sample, bench_sample_type, 0);
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perf_event__synthesize_sample(&event, bench_sample_type, 0, &sample);
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return writen(data->input_pipe[1], &event, event.header.size);
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}
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static u32 synthesize_flush(struct bench_data *data)
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{
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struct perf_event_header header = {
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.size = sizeof(header),
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.type = PERF_RECORD_FINISHED_ROUND,
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};
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return writen(data->input_pipe[1], &header, header.size);
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}
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static void *data_reader(void *arg)
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{
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struct bench_data *data = arg;
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char buf[8192];
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int flag;
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int n;
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flag = fcntl(data->output_pipe[0], F_GETFL);
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fcntl(data->output_pipe[0], F_SETFL, flag | O_NONBLOCK);
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/* read out data from child */
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while (true) {
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n = read(data->output_pipe[0], buf, sizeof(buf));
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if (n > 0)
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continue;
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if (n == 0)
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break;
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if (errno != EINTR && errno != EAGAIN)
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break;
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usleep(100);
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}
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close(data->output_pipe[0]);
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return NULL;
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}
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static int setup_injection(struct bench_data *data)
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{
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int ready_pipe[2];
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int dev_null_fd;
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char buf;
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if (pipe(ready_pipe) < 0)
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return -1;
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if (pipe(data->input_pipe) < 0)
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return -1;
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if (pipe(data->output_pipe) < 0)
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return -1;
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data->pid = fork();
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if (data->pid < 0)
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return -1;
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if (data->pid == 0) {
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const char **inject_argv;
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close(data->input_pipe[1]);
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close(data->output_pipe[0]);
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close(ready_pipe[0]);
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dup2(data->input_pipe[0], STDIN_FILENO);
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close(data->input_pipe[0]);
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dup2(data->output_pipe[1], STDOUT_FILENO);
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close(data->output_pipe[1]);
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dev_null_fd = open("/dev/null", O_WRONLY);
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if (dev_null_fd < 0)
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exit(1);
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dup2(dev_null_fd, STDERR_FILENO);
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inject_argv = calloc(3, sizeof(*inject_argv));
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if (inject_argv == NULL)
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exit(1);
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inject_argv[0] = strdup("inject");
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inject_argv[1] = strdup("-b");
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/* signal that we're ready to go */
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close(ready_pipe[1]);
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cmd_inject(2, inject_argv);
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exit(0);
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}
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pthread_create(&data->th, NULL, data_reader, data);
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close(ready_pipe[1]);
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close(data->input_pipe[0]);
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close(data->output_pipe[1]);
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/* wait for child ready */
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if (read(ready_pipe[0], &buf, 1) < 0)
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return -1;
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close(ready_pipe[0]);
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return 0;
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}
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static int inject_build_id(struct bench_data *data, u64 *max_rss)
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{
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int status;
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unsigned int i, k;
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struct rusage rusage;
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u64 len = 0;
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/* this makes the child to run */
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if (perf_header__write_pipe(data->input_pipe[1]) < 0)
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return -1;
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len += synthesize_attr(data);
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len += synthesize_fork(data);
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for (i = 0; i < nr_mmaps; i++) {
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int idx = rand() % (nr_dsos - 1);
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struct bench_dso *dso = &dsos[idx];
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u64 timestamp = rand() % 1000000;
|
||||
|
||||
pr_debug2(" [%d] injecting: %s\n", i+1, dso->name);
|
||||
len += synthesize_mmap(data, dso, timestamp);
|
||||
|
||||
for (k = 0; k < nr_samples; k++)
|
||||
len += synthesize_sample(data, dso, timestamp + k * 1000);
|
||||
|
||||
if ((i + 1) % 10 == 0)
|
||||
len += synthesize_flush(data);
|
||||
}
|
||||
|
||||
/* tihs makes the child to finish */
|
||||
close(data->input_pipe[1]);
|
||||
|
||||
wait4(data->pid, &status, 0, &rusage);
|
||||
*max_rss = rusage.ru_maxrss;
|
||||
|
||||
pr_debug(" Child %d exited with %d\n", data->pid, status);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int do_inject_loop(struct bench_data *data)
|
||||
{
|
||||
unsigned int i;
|
||||
struct stats time_stats, mem_stats;
|
||||
double time_average, time_stddev;
|
||||
double mem_average, mem_stddev;
|
||||
|
||||
srand(time(NULL));
|
||||
init_stats(&time_stats);
|
||||
init_stats(&mem_stats);
|
||||
symbol__init(NULL);
|
||||
|
||||
bench_sample_type = PERF_SAMPLE_IDENTIFIER | PERF_SAMPLE_IP;
|
||||
bench_sample_type |= PERF_SAMPLE_TID | PERF_SAMPLE_TIME;
|
||||
bench_id_hdr_size = 32;
|
||||
|
||||
collect_dso();
|
||||
if (nr_dsos == 0) {
|
||||
printf(" Cannot collect DSOs for injection\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
for (i = 0; i < iterations; i++) {
|
||||
struct timeval start, end, diff;
|
||||
u64 runtime_us, max_rss;
|
||||
|
||||
pr_debug(" Iteration #%d\n", i+1);
|
||||
|
||||
if (setup_injection(data) < 0) {
|
||||
printf(" Build-id injection setup failed\n");
|
||||
break;
|
||||
}
|
||||
|
||||
gettimeofday(&start, NULL);
|
||||
if (inject_build_id(data, &max_rss) < 0) {
|
||||
printf(" Build-id injection failed\n");
|
||||
break;
|
||||
}
|
||||
|
||||
gettimeofday(&end, NULL);
|
||||
timersub(&end, &start, &diff);
|
||||
runtime_us = diff.tv_sec * USEC_PER_SEC + diff.tv_usec;
|
||||
update_stats(&time_stats, runtime_us);
|
||||
update_stats(&mem_stats, max_rss);
|
||||
|
||||
pthread_join(data->th, NULL);
|
||||
}
|
||||
|
||||
time_average = avg_stats(&time_stats) / USEC_PER_MSEC;
|
||||
time_stddev = stddev_stats(&time_stats) / USEC_PER_MSEC;
|
||||
printf(" Average build-id injection took: %.3f msec (+- %.3f msec)\n",
|
||||
time_average, time_stddev);
|
||||
|
||||
/* each iteration, it processes MMAP2 + BUILD_ID + nr_samples * SAMPLE */
|
||||
time_average = avg_stats(&time_stats) / (nr_mmaps * (nr_samples + 2));
|
||||
time_stddev = stddev_stats(&time_stats) / (nr_mmaps * (nr_samples + 2));
|
||||
printf(" Average time per event: %.3f usec (+- %.3f usec)\n",
|
||||
time_average, time_stddev);
|
||||
|
||||
mem_average = avg_stats(&mem_stats);
|
||||
mem_stddev = stddev_stats(&mem_stats);
|
||||
printf(" Average memory usage: %.0f KB (+- %.0f KB)\n",
|
||||
mem_average, mem_stddev);
|
||||
|
||||
release_dso();
|
||||
return 0;
|
||||
}
|
||||
|
||||
int bench_inject_build_id(int argc, const char **argv)
|
||||
{
|
||||
struct bench_data data;
|
||||
|
||||
argc = parse_options(argc, argv, options, bench_usage, 0);
|
||||
if (argc) {
|
||||
usage_with_options(bench_usage, options);
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
return do_inject_loop(&data);
|
||||
}
|
||||
|
||||
|
|
@ -87,6 +87,7 @@ static struct bench epoll_benchmarks[] = {
|
|||
static struct bench internals_benchmarks[] = {
|
||||
{ "synthesize", "Benchmark perf event synthesis", bench_synthesize },
|
||||
{ "kallsyms-parse", "Benchmark kallsyms parsing", bench_kallsyms_parse },
|
||||
{ "inject-build-id", "Benchmark build-id injection", bench_inject_build_id },
|
||||
{ NULL, NULL, NULL }
|
||||
};
|
||||
|
||||
|
|
|
|||
|
|
@ -441,11 +441,10 @@ static int dso__inject_build_id(struct dso *dso, struct perf_tool *tool,
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int perf_event__inject_buildid(struct perf_tool *tool,
|
||||
union perf_event *event,
|
||||
struct perf_sample *sample,
|
||||
struct evsel *evsel __maybe_unused,
|
||||
struct machine *machine)
|
||||
int perf_event__inject_buildid(struct perf_tool *tool, union perf_event *event,
|
||||
struct perf_sample *sample,
|
||||
struct evsel *evsel __maybe_unused,
|
||||
struct machine *machine)
|
||||
{
|
||||
struct addr_location al;
|
||||
struct thread *thread;
|
||||
|
|
|
|||
|
|
@ -29,6 +29,10 @@ int build_id__mark_dso_hit(struct perf_tool *tool, union perf_event *event,
|
|||
|
||||
int dsos__hit_all(struct perf_session *session);
|
||||
|
||||
int perf_event__inject_buildid(struct perf_tool *tool, union perf_event *event,
|
||||
struct perf_sample *sample, struct evsel *evsel,
|
||||
struct machine *machine);
|
||||
|
||||
bool perf_session__read_build_ids(struct perf_session *session, bool with_hits);
|
||||
int perf_session__write_buildid_table(struct perf_session *session,
|
||||
struct feat_fd *fd);
|
||||
|
|
|
|||
Loading…
Reference in a new issue