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Subject[patch 06/23] SLUB: Extend slabinfo to support -D and -C options
-D lists caches that support defragmentation

-C lists caches that use a ctor.

Change field names for defrag_ratio and remote_node_defrag_ratio.

Add determination of the allocation ratio for a slab. The allocation ratio
is the percentage of available slots for objects in use.

Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
---
Documentation/vm/slabinfo.c | 52 +++++++++++++++++++++++++++++++++++++-------
1 file changed, 44 insertions(+), 8 deletions(-)
Index: linux-2.6.23-mm1/Documentation/vm/slabinfo.c
===================================================================
--- linux-2.6.23-mm1.orig/Documentation/vm/slabinfo.c 2007-10-12 16:25:54.000000000 -0700
+++ linux-2.6.23-mm1/Documentation/vm/slabinfo.c 2007-10-12 17:58:14.000000000 -0700
@@ -31,6 +31,8 @@ struct slabinfo {
int hwcache_align, object_size, objs_per_slab;
int sanity_checks, slab_size, store_user, trace;
int order, poison, reclaim_account, red_zone;
+ int defrag, ctor;
+ int defrag_ratio, remote_node_defrag_ratio;
unsigned long partial, objects, slabs;
int numa[MAX_NODES];
int numa_partial[MAX_NODES];
@@ -57,6 +59,8 @@ int show_slab = 0;
int skip_zero = 1;
int show_numa = 0;
int show_track = 0;
+int show_defrag = 0;
+int show_ctor = 0;
int show_first_alias = 0;
int validate = 0;
int shrink = 0;
@@ -91,18 +95,20 @@ void fatal(const char *x, ...)
void usage(void)
{
printf("slabinfo 5/7/2007. (c) 2007 sgi. clameter@sgi.com\n\n"
- "slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
+ "slabinfo [-aCDefhilnosSrtTvz1] [-d debugopts] [slab-regexp]\n"
"-a|--aliases Show aliases\n"
+ "-C|--ctor Show slabs with ctors\n"
"-d<options>|--debug=<options> Set/Clear Debug options\n"
- "-e|--empty Show empty slabs\n"
+ "-D|--defrag Show defragmentable caches\n"
+ "-e|--empty Show empty slabs\n"
"-f|--first-alias Show first alias\n"
"-h|--help Show usage information\n"
"-i|--inverted Inverted list\n"
"-l|--slabs Show slabs\n"
"-n|--numa Show NUMA information\n"
- "-o|--ops Show kmem_cache_ops\n"
+ "-o|--ops Show kmem_cache_ops\n"
"-s|--shrink Shrink slabs\n"
- "-r|--report Detailed report on single slabs\n"
+ "-r|--report Detailed report on single slabs\n"
"-S|--Size Sort by size\n"
"-t|--tracking Show alloc/free information\n"
"-T|--Totals Show summary information\n"
@@ -282,7 +288,7 @@ int line = 0;
void first_line(void)
{
printf("Name Objects Objsize Space "
- "Slabs/Part/Cpu O/S O %%Fr %%Ef Flg\n");
+ "Slabs/Part/Cpu O/S O %%Ra %%Ef Flg\n");
}

/*
@@ -325,7 +331,7 @@ void slab_numa(struct slabinfo *s, int m
return;

if (!line) {
- printf("\n%-21s:", mode ? "NUMA nodes" : "Slab");
+ printf("\n%-21s: Rto ", mode ? "NUMA nodes" : "Slab");
for(node = 0; node <= highest_node; node++)
printf(" %4d", node);
printf("\n----------------------");
@@ -334,6 +340,7 @@ void slab_numa(struct slabinfo *s, int m
printf("\n");
}
printf("%-21s ", mode ? "All slabs" : s->name);
+ printf("%3d ", s->remote_node_defrag_ratio);
for(node = 0; node <= highest_node; node++) {
char b[20];

@@ -407,6 +414,8 @@ void report(struct slabinfo *s)
printf("** Slabs are destroyed via RCU\n");
if (s->reclaim_account)
printf("** Reclaim accounting active\n");
+ if (s->defrag)
+ printf("** Defragmentation at %d%%\n", s->defrag_ratio);

printf("\nSizes (bytes) Slabs Debug Memory\n");
printf("------------------------------------------------------------------------\n");
@@ -453,6 +462,12 @@ void slabcache(struct slabinfo *s)
if (show_empty && s->slabs)
return;

+ if (show_defrag && !s->defrag)
+ return;
+
+ if (show_ctor && !s->ctor)
+ return;
+
store_size(size_str, slab_size(s));
snprintf(dist_str, 40, "%lu/%lu/%d", s->slabs, s->partial, s->cpu_slabs);

@@ -463,6 +478,10 @@ void slabcache(struct slabinfo *s)
*p++ = '*';
if (s->cache_dma)
*p++ = 'd';
+ if (s->defrag)
+ *p++ = 'D';
+ if (s->ctor)
+ *p++ = 'C';
if (s->hwcache_align)
*p++ = 'A';
if (s->poison)
@@ -482,7 +501,7 @@ void slabcache(struct slabinfo *s)
printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
s->name, s->objects, s->object_size, size_str, dist_str,
s->objs_per_slab, s->order,
- s->slabs ? (s->partial * 100) / s->slabs : 100,
+ s->slabs ? (s->objects * 100) / (s->slabs * s->objs_per_slab) : 100,
s->slabs ? (s->objects * s->object_size * 100) /
(s->slabs * (page_size << s->order)) : 100,
flags);
@@ -1074,7 +1093,16 @@ void read_slab_dir(void)
free(t);
slab->store_user = get_obj("store_user");
slab->trace = get_obj("trace");
+ slab->defrag_ratio = get_obj("defrag_ratio");
+ slab->remote_node_defrag_ratio =
+ get_obj("remote_node_defrag_ratio");
chdir("..");
+ if (read_slab_obj(slab, "ops")) {
+ if (strstr(buffer, "ctor :"))
+ slab->ctor = 1;
+ if (strstr(buffer, "kick :"))
+ slab->defrag = 1;
+ }
if (slab->name[0] == ':')
alias_targets++;
slab++;
@@ -1124,7 +1152,9 @@ void output_slabs(void)

struct option opts[] = {
{ "aliases", 0, NULL, 'a' },
+ { "ctor", 0, NULL, 'C' },
{ "debug", 2, NULL, 'd' },
+ { "defrag", 0, NULL, 'D' },
{ "empty", 0, NULL, 'e' },
{ "first-alias", 0, NULL, 'f' },
{ "help", 0, NULL, 'h' },
@@ -1149,7 +1179,7 @@ int main(int argc, char *argv[])

page_size = getpagesize();

- while ((c = getopt_long(argc, argv, "ad::efhil1noprstvzTS",
+ while ((c = getopt_long(argc, argv, "ad::efhil1noprstvzCDTS",
opts, NULL)) != -1)
switch (c) {
case '1':
@@ -1199,6 +1229,12 @@ int main(int argc, char *argv[])
case 'z':
skip_zero = 0;
break;
+ case 'C':
+ show_ctor = 1;
+ break;
+ case 'D':
+ show_defrag = 1;
+ break;
case 'T':
show_totals = 1;
break;
--
-
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