tools/vm/slabinfo: limit the number of reported slabs
Introduce opt "-N|--lines=K" to limit the number of slabs
being reported in output_slabs().
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/tools/vm/slabinfo.c b/tools/vm/slabinfo.c
index 258ed01..2ef7f0c 100644
--- a/tools/vm/slabinfo.c
+++ b/tools/vm/slabinfo.c
@@ -79,6 +79,7 @@
int set_debug = 0;
int show_ops = 0;
int show_activity = 0;
+int output_lines = -1;
/* Debug options */
int sanity = 0;
@@ -124,6 +125,7 @@
"-v|--validate Validate slabs\n"
"-z|--zero Include empty slabs\n"
"-1|--1ref Single reference\n"
+ "-N|--lines=K Show the first K slabs\n"
"\nValid debug options (FZPUT may be combined)\n"
"a / A Switch on all debug options (=FZUP)\n"
"- Switch off all debug options\n"
@@ -1242,11 +1244,14 @@
{
struct slabinfo *slab;
- for (slab = slabinfo; slab < slabinfo + slabs; slab++) {
+ for (slab = slabinfo; (slab < slabinfo + slabs) &&
+ output_lines != 0; slab++) {
if (slab->alias)
continue;
+ if (output_lines != -1)
+ output_lines--;
if (show_numa)
slab_numa(slab, 0);
@@ -1285,6 +1290,7 @@
{ "validate", no_argument, NULL, 'v' },
{ "zero", no_argument, NULL, 'z' },
{ "1ref", no_argument, NULL, '1'},
+ { "lines", required_argument, NULL, 'N'},
{ NULL, 0, NULL, 0 }
};
@@ -1296,7 +1302,7 @@
page_size = getpagesize();
- while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTS",
+ while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTSN:",
opts, NULL)) != -1)
switch (c) {
case '1':
@@ -1358,7 +1364,13 @@
case 'S':
sort_size = 1;
break;
-
+ case 'N':
+ if (optarg) {
+ output_lines = atoi(optarg);
+ if (output_lines < 1)
+ output_lines = 1;
+ }
+ break;
default:
fatal("%s: Invalid option '%c'\n", argv[0], optopt);