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>

diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index 6676c2d..1cb3d9b 100644 (file)
--- 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 (file)
--- 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 (file)
--- 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 (file)
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 (file)
--- 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 (file)
--- 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 (file)
--- 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 */