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Date: Mon, 19 Oct 2015 10:04:25 +0200
From: Ingo Molnar <mingo@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Peter Zijlstra <peterz@...radead.org>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 09/14] perf/bench/mem: Fix 'length' vs. 'size' naming confusion
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.
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
tools/perf/bench/mem-functions.c | 92 ++++++++++++++++++++++++++++++------------------------------
1 file changed, 46 insertions(+), 46 deletions(-)
diff --git a/tools/perf/bench/mem-functions.c b/tools/perf/bench/mem-functions.c
index fc2afd1bfb4e..0cd9020b8601 100644
--- a/tools/perf/bench/mem-functions.c
+++ b/tools/perf/bench/mem-functions.c
@@ -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[] = {
--
2.1.4
--
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