diff options
author | José Pekkarinen <jose.pekkarinen@nokia.com> | 2016-04-11 10:41:07 +0300 |
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committer | José Pekkarinen <jose.pekkarinen@nokia.com> | 2016-04-13 08:17:18 +0300 |
commit | e09b41010ba33a20a87472ee821fa407a5b8da36 (patch) | |
tree | d10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/tools/perf/bench/mem-functions.c | |
parent | f93b97fd65072de626c074dbe099a1fff05ce060 (diff) |
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page.
During the rebasing, the following patch collided:
Force tick interrupt and get rid of softirq magic(I70131fb85).
Collisions have been removed because its logic was found on the
source already.
Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/tools/perf/bench/mem-functions.c')
-rw-r--r-- | kernel/tools/perf/bench/mem-functions.c | 379 |
1 files changed, 379 insertions, 0 deletions
diff --git a/kernel/tools/perf/bench/mem-functions.c b/kernel/tools/perf/bench/mem-functions.c new file mode 100644 index 000000000..9419b9442 --- /dev/null +++ b/kernel/tools/perf/bench/mem-functions.c @@ -0,0 +1,379 @@ +/* + * mem-memcpy.c + * + * Simple memcpy() and memset() benchmarks + * + * Written by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp> + */ + +#include "../perf.h" +#include "../util/util.h" +#include "../util/parse-options.h" +#include "../util/header.h" +#include "../util/cloexec.h" +#include "bench.h" +#include "mem-memcpy-arch.h" +#include "mem-memset-arch.h" + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/time.h> +#include <errno.h> + +#define K 1024 + +static const char *size_str = "1MB"; +static const char *function_str = "all"; +static int nr_loops = 1; +static bool use_cycles; +static int cycles_fd; + +static const struct option options[] = { + OPT_STRING('s', "size", &size_str, "1MB", + "Specify the size of the memory buffers. " + "Available units: B, KB, MB, GB and TB (case insensitive)"), + + OPT_STRING('f', "function", &function_str, "all", + "Specify the function to run, \"all\" runs all available functions, \"help\" lists them"), + + OPT_INTEGER('l', "nr_loops", &nr_loops, + "Specify the number of loops to run. (default: 1)"), + + OPT_BOOLEAN('c', "cycles", &use_cycles, + "Use a cycles event instead of gettimeofday() to measure performance"), + + OPT_END() +}; + +typedef void *(*memcpy_t)(void *, const void *, size_t); +typedef void *(*memset_t)(void *, int, size_t); + +struct function { + const char *name; + const char *desc; + union { + memcpy_t memcpy; + memset_t memset; + } fn; +}; + +static struct perf_event_attr cycle_attr = { + .type = PERF_TYPE_HARDWARE, + .config = PERF_COUNT_HW_CPU_CYCLES +}; + +static void init_cycles(void) +{ + cycles_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1, perf_event_open_cloexec_flag()); + + if (cycles_fd < 0 && errno == ENOSYS) + die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); + else + BUG_ON(cycles_fd < 0); +} + +static u64 get_cycles(void) +{ + int ret; + u64 clk; + + ret = read(cycles_fd, &clk, sizeof(u64)); + BUG_ON(ret != sizeof(u64)); + + return clk; +} + +static double timeval2double(struct timeval *ts) +{ + return (double)ts->tv_sec + (double)ts->tv_usec / (double)1000000; +} + +#define print_bps(x) do { \ + if (x < K) \ + printf(" %14lf bytes/sec\n", x); \ + else if (x < K * K) \ + printf(" %14lfd KB/sec\n", x / K); \ + else if (x < K * K * K) \ + printf(" %14lf MB/sec\n", x / K / K); \ + else \ + printf(" %14lf GB/sec\n", x / K / K / K); \ + } while (0) + +struct bench_mem_info { + const struct function *functions; + u64 (*do_cycles)(const struct function *r, size_t size); + double (*do_gettimeofday)(const struct function *r, size_t size); + const char *const *usage; +}; + +static void __bench_mem_function(struct bench_mem_info *info, int r_idx, size_t size, double size_total) +{ + const struct function *r = &info->functions[r_idx]; + double result_bps = 0.0; + u64 result_cycles = 0; + + printf("# function '%s' (%s)\n", r->name, r->desc); + + if (bench_format == BENCH_FORMAT_DEFAULT) + printf("# Copying %s bytes ...\n\n", size_str); + + if (use_cycles) { + result_cycles = info->do_cycles(r, size); + } else { + result_bps = info->do_gettimeofday(r, size); + } + + switch (bench_format) { + case BENCH_FORMAT_DEFAULT: + if (use_cycles) { + printf(" %14lf cycles/byte\n", (double)result_cycles/size_total); + } else { + print_bps(result_bps); + } + break; + + case BENCH_FORMAT_SIMPLE: + if (use_cycles) { + printf("%lf\n", (double)result_cycles/size_total); + } else { + printf("%lf\n", result_bps); + } + break; + + default: + BUG_ON(1); + break; + } +} + +static int bench_mem_common(int argc, const char **argv, struct bench_mem_info *info) +{ + int i; + size_t size; + double size_total; + + argc = parse_options(argc, argv, options, info->usage, 0); + + if (use_cycles) + init_cycles(); + + size = (size_t)perf_atoll((char *)size_str); + size_total = (double)size * nr_loops; + + if ((s64)size <= 0) { + fprintf(stderr, "Invalid size:%s\n", size_str); + return 1; + } + + if (!strncmp(function_str, "all", 3)) { + for (i = 0; info->functions[i].name; i++) + __bench_mem_function(info, i, size, size_total); + return 0; + } + + for (i = 0; info->functions[i].name; i++) { + if (!strcmp(info->functions[i].name, function_str)) + break; + } + if (!info->functions[i].name) { + if (strcmp(function_str, "help") && strcmp(function_str, "h")) + printf("Unknown function: %s\n", function_str); + printf("Available functions:\n"); + for (i = 0; info->functions[i].name; i++) { + printf("\t%s ... %s\n", + info->functions[i].name, info->functions[i].desc); + } + return 1; + } + + __bench_mem_function(info, i, size, size_total); + + return 0; +} + +static void memcpy_alloc_mem(void **dst, void **src, size_t size) +{ + *dst = zalloc(size); + if (!*dst) + die("memory allocation failed - maybe size is too large?\n"); + + *src = zalloc(size); + if (!*src) + die("memory allocation failed - maybe size is too large?\n"); + + /* Make sure to always prefault zero pages even if MMAP_THRESH is crossed: */ + memset(*src, 0, size); +} + +static u64 do_memcpy_cycles(const struct function *r, size_t size) +{ + u64 cycle_start = 0ULL, cycle_end = 0ULL; + void *src = NULL, *dst = NULL; + memcpy_t fn = r->fn.memcpy; + int i; + + memcpy_alloc_mem(&dst, &src, size); + + /* + * We prefault the freshly allocated memory range here, + * to not measure page fault overhead: + */ + fn(dst, src, size); + + cycle_start = get_cycles(); + for (i = 0; i < nr_loops; ++i) + fn(dst, src, size); + cycle_end = get_cycles(); + + free(src); + free(dst); + return cycle_end - cycle_start; +} + +static double do_memcpy_gettimeofday(const struct function *r, size_t size) +{ + struct timeval tv_start, tv_end, tv_diff; + memcpy_t fn = r->fn.memcpy; + void *src = NULL, *dst = NULL; + int i; + + memcpy_alloc_mem(&dst, &src, size); + + /* + * We prefault the freshly allocated memory range here, + * to not measure page fault overhead: + */ + fn(dst, src, size); + + BUG_ON(gettimeofday(&tv_start, NULL)); + for (i = 0; i < nr_loops; ++i) + fn(dst, src, size); + BUG_ON(gettimeofday(&tv_end, NULL)); + + timersub(&tv_end, &tv_start, &tv_diff); + + free(src); + free(dst); + + return (double)(((double)size * nr_loops) / timeval2double(&tv_diff)); +} + +struct function memcpy_functions[] = { + { .name = "default", + .desc = "Default memcpy() provided by glibc", + .fn.memcpy = memcpy }, + +#ifdef HAVE_ARCH_X86_64_SUPPORT +# define MEMCPY_FN(_fn, _name, _desc) {.name = _name, .desc = _desc, .fn.memcpy = _fn}, +# include "mem-memcpy-x86-64-asm-def.h" +# undef MEMCPY_FN +#endif + + { .name = NULL, } +}; + +static const char * const bench_mem_memcpy_usage[] = { + "perf bench mem memcpy <options>", + NULL +}; + +int bench_mem_memcpy(int argc, const char **argv, const char *prefix __maybe_unused) +{ + struct bench_mem_info info = { + .functions = memcpy_functions, + .do_cycles = do_memcpy_cycles, + .do_gettimeofday = do_memcpy_gettimeofday, + .usage = bench_mem_memcpy_usage, + }; + + return bench_mem_common(argc, argv, &info); +} + +static void memset_alloc_mem(void **dst, size_t size) +{ + *dst = zalloc(size); + if (!*dst) + die("memory allocation failed - maybe size is too large?\n"); +} + +static u64 do_memset_cycles(const struct function *r, size_t size) +{ + u64 cycle_start = 0ULL, cycle_end = 0ULL; + memset_t fn = r->fn.memset; + void *dst = NULL; + int i; + + memset_alloc_mem(&dst, size); + + /* + * We prefault the freshly allocated memory range here, + * to not measure page fault overhead: + */ + fn(dst, -1, size); + + cycle_start = get_cycles(); + for (i = 0; i < nr_loops; ++i) + fn(dst, i, size); + cycle_end = get_cycles(); + + free(dst); + return cycle_end - cycle_start; +} + +static double do_memset_gettimeofday(const struct function *r, size_t size) +{ + struct timeval tv_start, tv_end, tv_diff; + memset_t fn = r->fn.memset; + void *dst = NULL; + int i; + + memset_alloc_mem(&dst, size); + + /* + * We prefault the freshly allocated memory range here, + * to not measure page fault overhead: + */ + fn(dst, -1, size); + + BUG_ON(gettimeofday(&tv_start, NULL)); + for (i = 0; i < nr_loops; ++i) + fn(dst, i, size); + BUG_ON(gettimeofday(&tv_end, NULL)); + + timersub(&tv_end, &tv_start, &tv_diff); + + free(dst); + return (double)(((double)size * nr_loops) / timeval2double(&tv_diff)); +} + +static const char * const bench_mem_memset_usage[] = { + "perf bench mem memset <options>", + NULL +}; + +static const struct function memset_functions[] = { + { .name = "default", + .desc = "Default memset() provided by glibc", + .fn.memset = memset }, + +#ifdef HAVE_ARCH_X86_64_SUPPORT +# define MEMSET_FN(_fn, _name, _desc) { .name = _name, .desc = _desc, .fn.memset = _fn }, +# include "mem-memset-x86-64-asm-def.h" +# undef MEMSET_FN +#endif + + { .name = NULL, } +}; + +int bench_mem_memset(int argc, const char **argv, const char *prefix __maybe_unused) +{ + struct bench_mem_info info = { + .functions = memset_functions, + .do_cycles = do_memset_cycles, + .do_gettimeofday = do_memset_gettimeofday, + .usage = bench_mem_memset_usage, + }; + + return bench_mem_common(argc, argv, &info); +} |