linux-kernel - [tip:perf/bench] perf bench: Make the mem/memcpy tests more user-friendly

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <tip-12eac0bf0461910ae6dd7f071f156f75461a37cf@git.kernel.org>
Date:	Sun, 22 Nov 2009 08:43:48 GMT
From:	tip-bot for Hitoshi Mitake <mitake@....info.waseda.ac.jp>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulus@...ba.org, hpa@...or.com,
	mingo@...hat.com, a.p.zijlstra@...llo.nl,
	mitake@....info.waseda.ac.jp, fweisbec@...il.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/bench] perf bench: Make the mem/memcpy tests more user-friendly

Commit-ID:  12eac0bf0461910ae6dd7f071f156f75461a37cf
Gitweb:     http://git.kernel.org/tip/12eac0bf0461910ae6dd7f071f156f75461a37cf
Author:     Hitoshi Mitake <mitake@....info.waseda.ac.jp>
AuthorDate: Fri, 20 Nov 2009 12:37:17 +0900
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sun, 22 Nov 2009 09:41:06 +0100

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@....info.waseda.ac.jp>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
LKML-Reference: <1258688237-3797-1-git-send-email-mitake@....info.waseda.ac.jp>
[ v2: improved a few small details ]
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 tools/perf/bench/mem-memcpy.c |   37 ++++++++++++++++++++++---------------
 1 files changed, 22 insertions(+), 15 deletions(-)

diff --git a/tools/perf/bench/mem-memcpy.c b/tools/perf/bench/mem-memcpy.c
index d4f4f98..5165fd1 100644
--- a/tools/perf/bench/mem-memcpy.c
+++ b/tools/perf/bench/mem-memcpy.c
@@ -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;
 	}
 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/