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perf bench: Make the mem/memcpy tests more user-friendly 

mem-memcpy.c uses perf event system calls to obtain CPU clocks.
And it suddenly dies with BUG_ON() when it running on Linux
doesn't support perf event.

Also fail at calloc() can occur easily when too large
length is passed. Fail of calloc() causes sudden death
with assert().

These behaviours are not friendly. So I fixed the treating of
errors.

Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1258688237-3797-1-git-send-email-mitake@dcl.info.waseda.ac.jp>
[ v2: improved a few small details ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Hitoshi Mitake 2009-11-20 12:37:17 +09:00 committed by Ingo Molnar
parent 827f3b4974
commit 12eac0bf04
1 changed files with 22 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
tools/perf/bench/mem-memcpy.c
View File

@ -22,9 +22,10 @@
#define K 1024
static const char *length_str = "1MB";
static const char *routine = "default";
static int use_clock = 0;
static const char *length_str = "1MB";
static const char *routine = "default";
static int use_clock = 0;
static int clock_fd;
static const struct option options[] = {
OPT_STRING('l', "length", &length_str, "1MB",
@ -57,17 +58,19 @@ static const char * const bench_mem_memcpy_usage[] = {
NULL
};
static int clock_fd;
static struct perf_event_attr clock_attr = {
.type = PERF_TYPE_HARDWARE,
.config = PERF_COUNT_HW_CPU_CYCLES
.type = PERF_TYPE_HARDWARE,
.config = PERF_COUNT_HW_CPU_CYCLES
};
static void init_clock(void)
{
clock_fd = sys_perf_event_open(&clock_attr, getpid(), -1, -1, 0);
BUG_ON(clock_fd < 0);
if (clock_fd < 0 && errno == ENOSYS)
die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
else
BUG_ON(clock_fd < 0);
}
static u64 get_clock(void)
@ -104,7 +107,8 @@ int bench_mem_memcpy(int argc, const char **argv,
tv_diff.tv_sec = 0;
tv_diff.tv_usec = 0;
length = (size_t)perf_atoll((char *)length_str);
if ((long long int)length <= 0) {
if ((s64)length <= 0) {
fprintf(stderr, "Invalid length:%s\n", length_str);
return 1;
}
@ -124,9 +128,12 @@ int bench_mem_memcpy(int argc, const char **argv,
}
dst = calloc(length, sizeof(char));
assert(dst);
if (!dst)
die("memory allocation failed - maybe length is too large?\n");
src = calloc(length, sizeof(char));
assert(src);
if (!src)
die("memory allocation failed - maybe length is too large?\n");
if (bench_format == BENCH_FORMAT_DEFAULT) {
printf("# Copying %s Bytes from %p to %p ...\n\n",
@ -136,8 +143,9 @@ int bench_mem_memcpy(int argc, const char **argv,
if (use_clock) {
init_clock();
clock_start = get_clock();
} else
} else {
BUG_ON(gettimeofday(&tv_start, NULL));
}
routines[i].fn(dst, src, length);
@ -176,9 +184,8 @@ int bench_mem_memcpy(int argc, const char **argv,
printf("%lf\n", bps);
break;
default:
/* reaching here is something disaster */
fprintf(stderr, "Unknown format:%d\n", bench_format);
exit(1);
/* reaching this means there's some disaster: */
die("unknown format: %d\n", bench_format);
break;
}