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Subject[tip:perf/core] perf tools: Add unit_number__scnprintf function
Commit-ID:  9808143ba2e54818a3cf445d9b69b3f5f15451ee
Gitweb: http://git.kernel.org/tip/9808143ba2e54818a3cf445d9b69b3f5f15451ee
Author: Jiri Olsa <jolsa@kernel.org>
AuthorDate: Mon, 9 Jan 2017 10:51:55 +0100
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 11 Jan 2017 16:48:01 -0300

perf tools: Add unit_number__scnprintf function

Add unit_number__scnprintf function to display size units and use it in
-m option info message.

Before:
$ perf record -m 10M ls
rounding mmap pages size to 16777216 bytes (4096 pages)
...

After:
$ perf record -m 10M ls
rounding mmap pages size to 16M (4096 pages)
...

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1483955520-29063-2-git-send-email-jolsa@kernel.org
[ Rename it to unit_number__scnprintf for consistency ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/tests/Build | 1 +
tools/perf/tests/builtin-test.c | 4 ++++
tools/perf/tests/tests.h | 1 +
tools/perf/tests/unit_number__scnprintf.c | 37 +++++++++++++++++++++++++++++++
tools/perf/util/evlist.c | 8 +++++--
tools/perf/util/util.c | 13 +++++++++++
tools/perf/util/util.h | 1 +
7 files changed, 63 insertions(+), 2 deletions(-)

diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index 6676c2d..1cb3d9b 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -44,6 +44,7 @@ perf-y += is_printable_array.o
perf-y += bitmap.o
perf-y += perf-hooks.o
perf-y += clang.o
+perf-y += unit_number__scnprintf.o

$(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c tests/Build
$(call rule_mkdir)
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index a77dcc0..37e326b 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -247,6 +247,10 @@ static struct test generic_tests[] = {
}
},
{
+ .desc = "unit_number__scnprintf",
+ .func = test__unit_number__scnprint,
+ },
+ {
.func = NULL,
},
};
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index a512f0c..1fa9b9d 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -96,6 +96,7 @@ int test__perf_hooks(int subtest);
int test__clang(int subtest);
const char *test__clang_subtest_get_desc(int subtest);
int test__clang_subtest_get_nr(void);
+int test__unit_number__scnprint(int subtest);

#if defined(__arm__) || defined(__aarch64__)
#ifdef HAVE_DWARF_UNWIND_SUPPORT
diff --git a/tools/perf/tests/unit_number__scnprintf.c b/tools/perf/tests/unit_number__scnprintf.c
new file mode 100644
index 0000000..623c2aa
--- /dev/null
+++ b/tools/perf/tests/unit_number__scnprintf.c
@@ -0,0 +1,37 @@
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include "tests.h"
+#include "util.h"
+#include "debug.h"
+
+int test__unit_number__scnprint(int subtest __maybe_unused)
+{
+ struct {
+ u64 n;
+ const char *str;
+ } test[] = {
+ { 1, "1B" },
+ { 10*1024, "10K" },
+ { 20*1024*1024, "20M" },
+ { 30*1024*1024*1024ULL, "30G" },
+ { 0, "0B" },
+ { 0, NULL },
+ };
+ unsigned i = 0;
+
+ while (test[i].str) {
+ char buf[100];
+
+ unit_number__scnprintf(buf, sizeof(buf), test[i].n);
+
+ pr_debug("n %" PRIu64 ", str '%s', buf '%s'\n",
+ test[i].n, test[i].str, buf);
+
+ if (strcmp(test[i].str, buf))
+ return TEST_FAIL;
+
+ i++;
+ }
+
+ return TEST_OK;
+}
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 23e6f33..dc4df3d 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1224,12 +1224,16 @@ static long parse_pages_arg(const char *str, unsigned long min,
if (pages == 0 && min == 0) {
/* leave number of pages at 0 */
} else if (!is_power_of_2(pages)) {
+ char buf[100];
+
/* round pages up to next power of 2 */
pages = roundup_pow_of_two(pages);
if (!pages)
return -EINVAL;
- pr_info("rounding mmap pages size to %lu bytes (%lu pages)\n",
- pages * page_size, pages);
+
+ unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
+ pr_info("rounding mmap pages size to %s (%lu pages)\n",
+ buf, pages);
}

if (pages > max)
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 9ddd988..bf29aed 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -789,3 +789,16 @@ int is_printable_array(char *p, unsigned int len)
}
return 1;
}
+
+int unit_number__scnprintf(char *buf, size_t size, u64 n)
+{
+ char unit[4] = "BKMG";
+ int i = 0;
+
+ while (((n / 1024) > 1) && (i < 3)) {
+ n /= 1024;
+ i++;
+ }
+
+ return scnprintf(buf, size, "%" PRIu64 "%c", n, unit[i]);
+}
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 1d639e3..6e8be17 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -363,4 +363,5 @@ int is_printable_array(char *p, unsigned int len);

int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz);

+int unit_number__scnprintf(char *buf, size_t size, u64 n);
#endif /* GIT_COMPAT_UTIL_H */
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