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perf bench mem: Fix 'length' vs. 'size' naming confusion

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So 'perf bench mem memcpy/memset' consistently uses 'len' and 'length'
for buffer sizes - while it's really a memory buffer size. (strings have
length.)

Rename all affected variables.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1445241870-24854-10-git-send-email-mingo@kernel.org
[ Update perf-bench man page ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ingo Molnar 2015-10-19 10:04:25 +02:00 committed by Arnaldo Carvalho de Melo
parent e815e32760
commit a69b4f7413
2 changed files with 50 additions and 50 deletions
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8
tools/perf/Documentation/perf-bench.txt
View File

@ -139,8 +139,8 @@ Suite for evaluating performance of simple memory copy in various ways.
Options of *memcpy*
^^^^^^^^^^^^^^^^^^^
-l::
--length::
Specify length of memory to copy (default: 1MB).
--size::
Specify size of memory to copy (default: 1MB).
Available units are B, KB, MB, GB and TB (case insensitive).
-r::
@ -163,8 +163,8 @@ Suite for evaluating performance of simple memory set in various ways.
Options of *memset*
^^^^^^^^^^^^^^^^^^^
-l::
--length::
Specify length of memory to set (default: 1MB).
--size::
Specify size of memory to set (default: 1MB).
Available units are B, KB, MB, GB and TB (case insensitive).
-r::

92
tools/perf/bench/mem-functions.c
View File

@ -23,15 +23,15 @@
#define K 1024
static const char *length_str = "1MB";
static const char *size_str = "1MB";
static const char *routine_str = "all";
static int iterations = 1;
static bool use_cycles;
static int cycles_fd;
static const struct option options[] = {
OPT_STRING('l', "length", &length_str, "1MB",
"Specify length of memory to copy. "
OPT_STRING('l', "size", &size_str, "1MB",
"Specify the size of the memory buffers. "
"Available units: B, KB, MB, GB and TB (upper and lower)"),
OPT_STRING('r', "routine", &routine_str, "all",
"Specify the routine to run, \"all\" runs all available routines"),
@ -117,12 +117,12 @@ static double timeval2double(struct timeval *ts)
struct bench_mem_info {
const struct routine *routines;
u64 (*do_cycles)(const struct routine *r, size_t len);
double (*do_gettimeofday)(const struct routine *r, size_t len);
u64 (*do_cycles)(const struct routine *r, size_t size);
double (*do_gettimeofday)(const struct routine *r, size_t size);
const char *const *usage;
};
static void __bench_mem_routine(struct bench_mem_info *info, int r_idx, size_t len, double totallen)
static void __bench_mem_routine(struct bench_mem_info *info, int r_idx, size_t size, double size_total)
{
const struct routine *r = &info->routines[r_idx];
double result_bps = 0.0;
@ -131,18 +131,18 @@ static void __bench_mem_routine(struct bench_mem_info *info, int r_idx, size_t l
printf("Routine %s (%s)\n", r->name, r->desc);
if (bench_format == BENCH_FORMAT_DEFAULT)
printf("# Copying %s Bytes ...\n\n", length_str);
printf("# Copying %s Bytes ...\n\n", size_str);
if (use_cycles) {
result_cycles = info->do_cycles(r, len);
result_cycles = info->do_cycles(r, size);
} else {
result_bps = info->do_gettimeofday(r, len);
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/totallen);
printf(" %14lf cycles/Byte\n", (double)result_cycles/size_total);
} else {
print_bps(result_bps);
}
@ -150,7 +150,7 @@ static void __bench_mem_routine(struct bench_mem_info *info, int r_idx, size_t l
case BENCH_FORMAT_SIMPLE:
if (use_cycles) {
printf("%lf\n", (double)result_cycles/totallen);
printf("%lf\n", (double)result_cycles/size_total);
} else {
printf("%lf\n", result_bps);
}
@ -165,25 +165,25 @@ static void __bench_mem_routine(struct bench_mem_info *info, int r_idx, size_t l
static int bench_mem_common(int argc, const char **argv, struct bench_mem_info *info)
{
int i;
size_t len;
double totallen;
size_t size;
double size_total;
argc = parse_options(argc, argv, options, info->usage, 0);
if (use_cycles)
init_cycles();
len = (size_t)perf_atoll((char *)length_str);
totallen = (double)len * iterations;
size = (size_t)perf_atoll((char *)size_str);
size_total = (double)size * iterations;
if ((s64)len <= 0) {
fprintf(stderr, "Invalid length:%s\n", length_str);
if ((s64)size <= 0) {
fprintf(stderr, "Invalid size:%s\n", size_str);
return 1;
}
if (!strncmp(routine_str, "all", 3)) {
for (i = 0; info->routines[i].name; i++)
__bench_mem_routine(info, i, len, totallen);
__bench_mem_routine(info, i, size, size_total);
return 0;
}
@ -201,43 +201,43 @@ static int bench_mem_common(int argc, const char **argv, struct bench_mem_info *
return 1;
}
__bench_mem_routine(info, i, len, totallen);
__bench_mem_routine(info, i, size, size_total);
return 0;
}
static void memcpy_alloc_mem(void **dst, void **src, size_t length)
static void memcpy_alloc_mem(void **dst, void **src, size_t size)
{
*dst = zalloc(length);
*dst = zalloc(size);
if (!*dst)
die("memory allocation failed - maybe length is too large?\n");
die("memory allocation failed - maybe size is too large?\n");
*src = zalloc(length);
*src = zalloc(size);
if (!*src)
die("memory allocation failed - maybe length is too large?\n");
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, length);
memset(*src, 0, size);
}
static u64 do_memcpy_cycles(const struct routine *r, size_t len)
static u64 do_memcpy_cycles(const struct routine *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, len);
memcpy_alloc_mem(&dst, &src, size);
/*
* We prefault the freshly allocated memory range here,
* to not measure page fault overhead:
*/
fn(dst, src, len);
fn(dst, src, size);
cycle_start = get_cycles();
for (i = 0; i < iterations; ++i)
fn(dst, src, len);
fn(dst, src, size);
cycle_end = get_cycles();
free(src);
@ -245,24 +245,24 @@ static u64 do_memcpy_cycles(const struct routine *r, size_t len)
return cycle_end - cycle_start;
}
static double do_memcpy_gettimeofday(const struct routine *r, size_t len)
static double do_memcpy_gettimeofday(const struct routine *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, len);
memcpy_alloc_mem(&dst, &src, size);
/*
* We prefault the freshly allocated memory range here,
* to not measure page fault overhead:
*/
fn(dst, src, len);
fn(dst, src, size);
BUG_ON(gettimeofday(&tv_start, NULL));
for (i = 0; i < iterations; ++i)
fn(dst, src, len);
fn(dst, src, size);
BUG_ON(gettimeofday(&tv_end, NULL));
timersub(&tv_end, &tv_start, &tv_diff);
@ -270,7 +270,7 @@ static double do_memcpy_gettimeofday(const struct routine *r, size_t len)
free(src);
free(dst);
return (double)(((double)len * iterations) / timeval2double(&tv_diff));
return (double)(((double)size * iterations) / timeval2double(&tv_diff));
}
int bench_mem_memcpy(int argc, const char **argv, const char *prefix __maybe_unused)
@ -285,61 +285,61 @@ int bench_mem_memcpy(int argc, const char **argv, const char *prefix __maybe_unu
return bench_mem_common(argc, argv, &info);
}
static void memset_alloc_mem(void **dst, size_t length)
static void memset_alloc_mem(void **dst, size_t size)
{
*dst = zalloc(length);
*dst = zalloc(size);
if (!*dst)
die("memory allocation failed - maybe length is too large?\n");
die("memory allocation failed - maybe size is too large?\n");
}
static u64 do_memset_cycles(const struct routine *r, size_t len)
static u64 do_memset_cycles(const struct routine *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, len);
memset_alloc_mem(&dst, size);
/*
* We prefault the freshly allocated memory range here,
* to not measure page fault overhead:
*/
fn(dst, -1, len);
fn(dst, -1, size);
cycle_start = get_cycles();
for (i = 0; i < iterations; ++i)
fn(dst, i, len);
fn(dst, i, size);
cycle_end = get_cycles();
free(dst);
return cycle_end - cycle_start;
}
static double do_memset_gettimeofday(const struct routine *r, size_t len)
static double do_memset_gettimeofday(const struct routine *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, len);
memset_alloc_mem(&dst, size);
/*
* We prefault the freshly allocated memory range here,
* to not measure page fault overhead:
*/
fn(dst, -1, len);
fn(dst, -1, size);
BUG_ON(gettimeofday(&tv_start, NULL));
for (i = 0; i < iterations; ++i)
fn(dst, i, len);
fn(dst, i, size);
BUG_ON(gettimeofday(&tv_end, NULL));
timersub(&tv_end, &tv_start, &tv_diff);
free(dst);
return (double)(((double)len * iterations) / timeval2double(&tv_diff));
return (double)(((double)size * iterations) / timeval2double(&tv_diff));
}
static const char * const bench_mem_memset_usage[] = {