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Subject[PATCH 5/6] perf kmem: Add kmem.default config option
Date
Currently perf kmem command will select --slab if neither --slab nor
--page is given for backward compatibility. Add kmem.default config
option to select the default value ('page' or 'slab').

# cat ~/.perfconfig
[kmem]
default = page

# perf kmem stat

SUMMARY (page allocator)
========================
Total allocation requests : 1,518 [ 6,096 KB ]
Total free requests : 1,431 [ 5,748 KB ]

Total alloc+freed requests : 1,330 [ 5,344 KB ]
Total alloc-only requests : 188 [ 752 KB ]
Total free-only requests : 101 [ 404 KB ]

Total allocation failures : 0 [ 0 KB ]
...

Cc: Taeung Song <treeze.taeung@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/builtin-kmem.c | 32 +++++++++++++++++++++++++++++---
1 file changed, 29 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 8c1673961067..f0d018179e1c 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -28,6 +28,10 @@ static int kmem_slab;
static int kmem_page;

static long kmem_page_size;
+static enum {
+ KMEM_SLAB,
+ KMEM_PAGE,
+} kmem_default = KMEM_SLAB; /* for backward compatibility */

struct alloc_stat;
typedef int (*sort_fn_t)(void *, void *);
@@ -1710,7 +1714,8 @@ static int parse_sort_opt(const struct option *opt __maybe_unused,
if (!arg)
return -1;

- if (kmem_page > kmem_slab) {
+ if (kmem_page > kmem_slab ||
+ (kmem_page == 0 && kmem_slab == 0 && kmem_default == KMEM_PAGE)) {
if (caller_flag > alloc_flag)
return setup_page_sorting(&page_caller_sort, arg);
else
@@ -1826,6 +1831,22 @@ static int __cmd_record(int argc, const char **argv)
return cmd_record(i, rec_argv, NULL);
}

+static int kmem_config(const char *var, const char *value, void *cb)
+{
+ if (!strcmp(var, "kmem.default")) {
+ if (!strcmp(value, "slab"))
+ kmem_default = KMEM_SLAB;
+ else if (!strcmp(value, "page"))
+ kmem_default = KMEM_PAGE;
+ else
+ pr_err("invalid default value ('slab' or 'page' required): %s\n",
+ value);
+ return 0;
+ }
+
+ return perf_default_config(var, value, cb);
+}
+
int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
{
const char * const default_slab_sort = "frag,hit,bytes";
@@ -1862,14 +1883,19 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
struct perf_session *session;
int ret = -1;

+ perf_config(kmem_config, NULL);
argc = parse_options_subcommand(argc, argv, kmem_options,
kmem_subcommands, kmem_usage, 0);

if (!argc)
usage_with_options(kmem_usage, kmem_options);

- if (kmem_slab == 0 && kmem_page == 0)
- kmem_slab = 1; /* for backward compatibility */
+ if (kmem_slab == 0 && kmem_page == 0) {
+ if (kmem_default == KMEM_SLAB)
+ kmem_slab = 1;
+ else
+ kmem_page = 1;
+ }

if (!strncmp(argv[0], "rec", 3)) {
symbol__init(NULL);
--
2.3.4


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