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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>
This commit is contained in:
Sergey Senozhatsky 2015-11-05 18:45:20 -08:00 committed by Linus Torvalds
parent 2b10075539
commit 4980a9639b
1 changed files with 15 additions and 3 deletions
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18
tools/vm/slabinfo.c
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@ -79,6 +79,7 @@ int sort_active = 0;
int set_debug = 0; int set_debug = 0;
int show_ops = 0; int show_ops = 0;
int show_activity = 0; int show_activity = 0;
int output_lines = -1;
/* Debug options */ /* Debug options */
int sanity = 0; int sanity = 0;
@ -124,6 +125,7 @@ static void usage(void)
"-v|--validate Validate slabs\n" "-v|--validate Validate slabs\n"
"-z|--zero Include empty slabs\n" "-z|--zero Include empty slabs\n"
"-1|--1ref Single reference\n" "-1|--1ref Single reference\n"
"-N|--lines=K Show the first K slabs\n"
"\nValid debug options (FZPUT may be combined)\n" "\nValid debug options (FZPUT may be combined)\n"
"a / A Switch on all debug options (=FZUP)\n" "a / A Switch on all debug options (=FZUP)\n"
"- Switch off all debug options\n" "- Switch off all debug options\n"
@ -1242,11 +1244,14 @@ static void output_slabs(void)
{ {
struct slabinfo *slab; struct slabinfo *slab;
for (slab = slabinfo; slab < slabinfo + slabs; slab++) { for (slab = slabinfo; (slab < slabinfo + slabs) &&
output_lines != 0; slab++) {
if (slab->alias) if (slab->alias)
continue; continue;
if (output_lines != -1)
output_lines--;
if (show_numa) if (show_numa)
slab_numa(slab, 0); slab_numa(slab, 0);
@ -1285,6 +1290,7 @@ struct option opts[] = {
{ "validate", no_argument, NULL, 'v' }, { "validate", no_argument, NULL, 'v' },
{ "zero", no_argument, NULL, 'z' }, { "zero", no_argument, NULL, 'z' },
{ "1ref", no_argument, NULL, '1'}, { "1ref", no_argument, NULL, '1'},
{ "lines", required_argument, NULL, 'N'},
{ NULL, 0, NULL, 0 } { NULL, 0, NULL, 0 }
}; };
@ -1296,7 +1302,7 @@ int main(int argc, char *argv[])
page_size = getpagesize(); page_size = getpagesize();
while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTS", while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTSN:",
opts, NULL)) != -1) opts, NULL)) != -1)
switch (c) { switch (c) {
case '1': case '1':
@ -1358,7 +1364,13 @@ int main(int argc, char *argv[])
case 'S': case 'S':
sort_size = 1; sort_size = 1;
break; break;
case 'N':
if (optarg) {
output_lines = atoi(optarg);
if (output_lines < 1)
output_lines = 1;
}
break;
default: default:
fatal("%s: Invalid option '%c'\n", argv[0], optopt); fatal("%s: Invalid option '%c'\n", argv[0], optopt);