SLUB: slabinfo upgrade
-e Show empty slabs
-d Modification of slab debug options at runtime
-o Operations. Display of ctor / dtor etc.
-r Report: Display all available information about a slabcache.
Cleanup tracking display and make it work right.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/Documentation/vm/slabinfo.c b/Documentation/vm/slabinfo.c
index 41710cc..686a8e0 100644
--- a/Documentation/vm/slabinfo.c
+++ b/Documentation/vm/slabinfo.c
@@ -16,6 +16,7 @@
#include <stdarg.h>
#include <getopt.h>
#include <regex.h>
+#include <errno.h>
#define MAX_SLABS 500
#define MAX_ALIASES 500
@@ -41,12 +42,15 @@
} aliasinfo[MAX_ALIASES];
int slabs = 0;
+int actual_slabs = 0;
int aliases = 0;
int alias_targets = 0;
int highest_node = 0;
char buffer[4096];
+int show_empty = 0;
+int show_report = 0;
int show_alias = 0;
int show_slab = 0;
int skip_zero = 1;
@@ -59,6 +63,15 @@
int show_single_ref = 0;
int show_totals = 0;
int sort_size = 0;
+int set_debug = 0;
+int show_ops = 0;
+
+/* Debug options */
+int sanity = 0;
+int redzone = 0;
+int poison = 0;
+int tracking = 0;
+int tracing = 0;
int page_size;
@@ -76,20 +89,33 @@
void usage(void)
{
- printf("slabinfo [-ahnpvtsz] [slab-regexp]\n"
+ printf("slabinfo 5/7/2007. (c) 2007 sgi. clameter@sgi.com\n\n"
+ "slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
"-a|--aliases Show aliases\n"
+ "-d<options>|--debug=<options> Set/Clear Debug options\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"
"-s|--shrink Shrink slabs\n"
- "-v|--validate Validate 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"
- "-l|--slabs Show slabs\n"
- "-S|--Size Sort by size\n"
+ "-v|--validate Validate slabs\n"
"-z|--zero Include empty slabs\n"
- "-f|--first-alias Show first alias\n"
- "-i|--inverted Inverted list\n"
"-1|--1ref Single reference\n"
+ "\nValid debug options (FZPUT may be combined)\n"
+ "a / A Switch on all debug options (=FZUP)\n"
+ "- Switch off all debug options\n"
+ "f / F Sanity Checks (SLAB_DEBUG_FREE)\n"
+ "z / Z Redzoning\n"
+ "p / P Poisoning\n"
+ "u / U Tracking\n"
+ "t / T Tracing\n"
);
}
@@ -143,11 +169,10 @@
void set_obj(struct slabinfo *s, char *name, int n)
{
char x[100];
+ FILE *f;
sprintf(x, "%s/%s", s->name, name);
-
- FILE *f = fopen(x, "w");
-
+ f = fopen(x, "w");
if (!f)
fatal("Cannot write to %s\n", x);
@@ -155,6 +180,26 @@
fclose(f);
}
+unsigned long read_slab_obj(struct slabinfo *s, char *name)
+{
+ char x[100];
+ FILE *f;
+ int l;
+
+ sprintf(x, "%s/%s", s->name, name);
+ f = fopen(x, "r");
+ if (!f) {
+ buffer[0] = 0;
+ l = 0;
+ } else {
+ l = fread(buffer, 1, sizeof(buffer), f);
+ buffer[l] = 0;
+ fclose(f);
+ }
+ return l;
+}
+
+
/*
* Put a size string together
*/
@@ -226,7 +271,7 @@
void first_line(void)
{
- printf("Name Objects Objsize Space "
+ printf("Name Objects Objsize Space "
"Slabs/Part/Cpu O/S O %%Fr %%Ef Flg\n");
}
@@ -246,10 +291,7 @@
return best;
}
}
- if (best)
- return best;
- fatal("Cannot find alias for %s\n", find->name);
- return NULL;
+ return best;
}
unsigned long slab_size(struct slabinfo *s)
@@ -257,6 +299,126 @@
return s->slabs * (page_size << s->order);
}
+void slab_numa(struct slabinfo *s, int mode)
+{
+ int node;
+
+ if (strcmp(s->name, "*") == 0)
+ return;
+
+ if (!highest_node) {
+ printf("\n%s: No NUMA information available.\n", s->name);
+ return;
+ }
+
+ if (skip_zero && !s->slabs)
+ return;
+
+ if (!line) {
+ printf("\n%-21s:", mode ? "NUMA nodes" : "Slab");
+ for(node = 0; node <= highest_node; node++)
+ printf(" %4d", node);
+ printf("\n----------------------");
+ for(node = 0; node <= highest_node; node++)
+ printf("-----");
+ printf("\n");
+ }
+ printf("%-21s ", mode ? "All slabs" : s->name);
+ for(node = 0; node <= highest_node; node++) {
+ char b[20];
+
+ store_size(b, s->numa[node]);
+ printf(" %4s", b);
+ }
+ printf("\n");
+ if (mode) {
+ printf("%-21s ", "Partial slabs");
+ for(node = 0; node <= highest_node; node++) {
+ char b[20];
+
+ store_size(b, s->numa_partial[node]);
+ printf(" %4s", b);
+ }
+ printf("\n");
+ }
+ line++;
+}
+
+void show_tracking(struct slabinfo *s)
+{
+ printf("\n%s: Kernel object allocation\n", s->name);
+ printf("-----------------------------------------------------------------------\n");
+ if (read_slab_obj(s, "alloc_calls"))
+ printf(buffer);
+ else
+ printf("No Data\n");
+
+ printf("\n%s: Kernel object freeing\n", s->name);
+ printf("------------------------------------------------------------------------\n");
+ if (read_slab_obj(s, "free_calls"))
+ printf(buffer);
+ else
+ printf("No Data\n");
+
+}
+
+void ops(struct slabinfo *s)
+{
+ if (strcmp(s->name, "*") == 0)
+ return;
+
+ if (read_slab_obj(s, "ops")) {
+ printf("\n%s: kmem_cache operations\n", s->name);
+ printf("--------------------------------------------\n");
+ printf(buffer);
+ } else
+ printf("\n%s has no kmem_cache operations\n", s->name);
+}
+
+const char *onoff(int x)
+{
+ if (x)
+ return "On ";
+ return "Off";
+}
+
+void report(struct slabinfo *s)
+{
+ if (strcmp(s->name, "*") == 0)
+ return;
+ printf("\nSlabcache: %-20s Aliases: %2d Order : %2d\n", s->name, s->aliases, s->order);
+ if (s->hwcache_align)
+ printf("** Hardware cacheline aligned\n");
+ if (s->cache_dma)
+ printf("** Memory is allocated in a special DMA zone\n");
+ if (s->destroy_by_rcu)
+ printf("** Slabs are destroyed via RCU\n");
+ if (s->reclaim_account)
+ printf("** Reclaim accounting active\n");
+
+ printf("\nSizes (bytes) Slabs Debug Memory\n");
+ printf("------------------------------------------------------------------------\n");
+ printf("Object : %7d Total : %7ld Sanity Checks : %s Total: %7ld\n",
+ s->object_size, s->slabs, onoff(s->sanity_checks),
+ s->slabs * (page_size << s->order));
+ printf("SlabObj: %7d Full : %7ld Redzoning : %s Used : %7ld\n",
+ s->slab_size, s->slabs - s->partial - s->cpu_slabs,
+ onoff(s->red_zone), s->objects * s->object_size);
+ printf("SlabSiz: %7d Partial: %7ld Poisoning : %s Loss : %7ld\n",
+ page_size << s->order, s->partial, onoff(s->poison),
+ s->slabs * (page_size << s->order) - s->objects * s->object_size);
+ printf("Loss : %7d CpuSlab: %7d Tracking : %s Lalig: %7ld\n",
+ s->slab_size - s->object_size, s->cpu_slabs, onoff(s->store_user),
+ (s->slab_size - s->object_size) * s->objects);
+ printf("Align : %7d Objects: %7d Tracing : %s Lpadd: %7ld\n",
+ s->align, s->objs_per_slab, onoff(s->trace),
+ ((page_size << s->order) - s->objs_per_slab * s->slab_size) *
+ s->slabs);
+
+ ops(s);
+ show_tracking(s);
+ slab_numa(s, 1);
+}
void slabcache(struct slabinfo *s)
{
@@ -265,7 +427,18 @@
char flags[20];
char *p = flags;
- if (skip_zero && !s->slabs)
+ if (strcmp(s->name, "*") == 0)
+ return;
+
+ if (actual_slabs == 1) {
+ report(s);
+ return;
+ }
+
+ if (skip_zero && !show_empty && !s->slabs)
+ return;
+
+ if (show_empty && s->slabs)
return;
store_size(size_str, slab_size(s));
@@ -303,48 +476,128 @@
flags);
}
-void slab_numa(struct slabinfo *s)
+/*
+ * Analyze debug options. Return false if something is amiss.
+ */
+int debug_opt_scan(char *opt)
{
- int node;
+ if (!opt || !opt[0] || strcmp(opt, "-") == 0)
+ return 1;
- if (!highest_node)
- fatal("No NUMA information available.\n");
-
- if (skip_zero && !s->slabs)
- return;
-
- if (!line) {
- printf("\nSlab Node ");
- for(node = 0; node <= highest_node; node++)
- printf(" %4d", node);
- printf("\n----------------------");
- for(node = 0; node <= highest_node; node++)
- printf("-----");
- printf("\n");
+ if (strcasecmp(opt, "a") == 0) {
+ sanity = 1;
+ poison = 1;
+ redzone = 1;
+ tracking = 1;
+ return 1;
}
- printf("%-21s ", s->name);
- for(node = 0; node <= highest_node; node++) {
- char b[20];
- store_size(b, s->numa[node]);
- printf(" %4s", b);
- }
- printf("\n");
- line++;
+ for ( ; *opt; opt++)
+ switch (*opt) {
+ case 'F' : case 'f':
+ if (sanity)
+ return 0;
+ sanity = 1;
+ break;
+ case 'P' : case 'p':
+ if (poison)
+ return 0;
+ poison = 1;
+ break;
+
+ case 'Z' : case 'z':
+ if (redzone)
+ return 0;
+ redzone = 1;
+ break;
+
+ case 'U' : case 'u':
+ if (tracking)
+ return 0;
+ tracking = 1;
+ break;
+
+ case 'T' : case 't':
+ if (tracing)
+ return 0;
+ tracing = 1;
+ break;
+ default:
+ return 0;
+ }
+ return 1;
}
-void show_tracking(struct slabinfo *s)
+int slab_empty(struct slabinfo *s)
{
- printf("\n%s: Calls to allocate a slab object\n", s->name);
- printf("---------------------------------------------------\n");
- if (read_obj("alloc_calls"))
- printf(buffer);
+ if (s->objects > 0)
+ return 0;
- printf("%s: Calls to free a slab object\n", s->name);
- printf("-----------------------------------------------\n");
- if (read_obj("free_calls"))
- printf(buffer);
+ /*
+ * We may still have slabs even if there are no objects. Shrinking will
+ * remove them.
+ */
+ if (s->slabs != 0)
+ set_obj(s, "shrink", 1);
+ return 1;
+}
+
+void slab_debug(struct slabinfo *s)
+{
+ if (sanity && !s->sanity_checks) {
+ set_obj(s, "sanity", 1);
+ }
+ if (!sanity && s->sanity_checks) {
+ if (slab_empty(s))
+ set_obj(s, "sanity", 0);
+ else
+ fprintf(stderr, "%s not empty cannot disable sanity checks\n", s->name);
+ }
+ if (redzone && !s->red_zone) {
+ if (slab_empty(s))
+ set_obj(s, "red_zone", 1);
+ else
+ fprintf(stderr, "%s not empty cannot enable redzoning\n", s->name);
+ }
+ if (!redzone && s->red_zone) {
+ if (slab_empty(s))
+ set_obj(s, "red_zone", 0);
+ else
+ fprintf(stderr, "%s not empty cannot disable redzoning\n", s->name);
+ }
+ if (poison && !s->poison) {
+ if (slab_empty(s))
+ set_obj(s, "poison", 1);
+ else
+ fprintf(stderr, "%s not empty cannot enable poisoning\n", s->name);
+ }
+ if (!poison && s->poison) {
+ if (slab_empty(s))
+ set_obj(s, "poison", 0);
+ else
+ fprintf(stderr, "%s not empty cannot disable poisoning\n", s->name);
+ }
+ if (tracking && !s->store_user) {
+ if (slab_empty(s))
+ set_obj(s, "store_user", 1);
+ else
+ fprintf(stderr, "%s not empty cannot enable tracking\n", s->name);
+ }
+ if (!tracking && s->store_user) {
+ if (slab_empty(s))
+ set_obj(s, "store_user", 0);
+ else
+ fprintf(stderr, "%s not empty cannot disable tracking\n", s->name);
+ }
+ if (tracing && !s->trace) {
+ if (slabs == 1)
+ set_obj(s, "trace", 1);
+ else
+ fprintf(stderr, "%s can only enable trace for one slab at a time\n", s->name);
+ }
+ if (!tracing && s->trace)
+ set_obj(s, "trace", 1);
}
void totals(void)
@@ -673,7 +926,7 @@
for (a = aliasinfo; a < aliasinfo + aliases; a++) {
- for(s = slabinfo; s < slabinfo + slabs; s++)
+ for (s = slabinfo; s < slabinfo + slabs; s++)
if (strcmp(a->ref, s->name) == 0) {
a->slab = s;
s->refs++;
@@ -704,7 +957,7 @@
continue;
}
}
- printf("\n%-20s <- %s", a->slab->name, a->name);
+ printf("\n%-12s <- %s", a->slab->name, a->name);
active = a->slab->name;
}
else
@@ -729,7 +982,12 @@
a = find_one_alias(s);
- s->name = a->name;
+ if (a)
+ s->name = a->name;
+ else {
+ s->name = "*";
+ actual_slabs--;
+ }
}
}
@@ -748,11 +1006,14 @@
char *t;
int count;
+ if (chdir("/sys/slab"))
+ fatal("SYSFS support for SLUB not active\n");
+
dir = opendir(".");
while ((de = readdir(dir))) {
if (de->d_name[0] == '.' ||
- slab_mismatch(de->d_name))
- continue;
+ (de->d_name[0] != ':' && slab_mismatch(de->d_name)))
+ continue;
switch (de->d_type) {
case DT_LNK:
alias->name = strdup(de->d_name);
@@ -807,6 +1068,7 @@
}
closedir(dir);
slabs = slab - slabinfo;
+ actual_slabs = slabs;
aliases = alias - aliasinfo;
if (slabs > MAX_SLABS)
fatal("Too many slabs\n");
@@ -825,34 +1087,37 @@
if (show_numa)
- slab_numa(slab);
- else
- if (show_track)
+ slab_numa(slab, 0);
+ else if (show_track)
show_tracking(slab);
- else
- if (validate)
+ else if (validate)
slab_validate(slab);
- else
- if (shrink)
+ else if (shrink)
slab_shrink(slab);
- else {
- if (show_slab)
- slabcache(slab);
- }
+ else if (set_debug)
+ slab_debug(slab);
+ else if (show_ops)
+ ops(slab);
+ else if (show_slab)
+ slabcache(slab);
}
}
struct option opts[] = {
{ "aliases", 0, NULL, 'a' },
- { "slabs", 0, NULL, 'l' },
- { "numa", 0, NULL, 'n' },
- { "zero", 0, NULL, 'z' },
- { "help", 0, NULL, 'h' },
- { "validate", 0, NULL, 'v' },
+ { "debug", 2, NULL, 'd' },
+ { "empty", 0, NULL, 'e' },
{ "first-alias", 0, NULL, 'f' },
- { "shrink", 0, NULL, 's' },
- { "track", 0, NULL, 't'},
+ { "help", 0, NULL, 'h' },
{ "inverted", 0, NULL, 'i'},
+ { "numa", 0, NULL, 'n' },
+ { "ops", 0, NULL, 'o' },
+ { "report", 0, NULL, 'r' },
+ { "shrink", 0, NULL, 's' },
+ { "slabs", 0, NULL, 'l' },
+ { "track", 0, NULL, 't'},
+ { "validate", 0, NULL, 'v' },
+ { "zero", 0, NULL, 'z' },
{ "1ref", 0, NULL, '1'},
{ NULL, 0, NULL, 0 }
};
@@ -864,10 +1129,9 @@
char *pattern_source;
page_size = getpagesize();
- if (chdir("/sys/slab"))
- fatal("This kernel does not have SLUB support.\n");
- while ((c = getopt_long(argc, argv, "afhil1npstvzTS", opts, NULL)) != -1)
+ while ((c = getopt_long(argc, argv, "ad::efhil1noprstvzTS",
+ opts, NULL)) != -1)
switch(c) {
case '1':
show_single_ref = 1;
@@ -875,6 +1139,14 @@
case 'a':
show_alias = 1;
break;
+ case 'd':
+ set_debug = 1;
+ if (!debug_opt_scan(optarg))
+ fatal("Invalid debug option '%s'\n", optarg);
+ break;
+ case 'e':
+ show_empty = 1;
+ break;
case 'f':
show_first_alias = 1;
break;
@@ -887,6 +1159,12 @@
case 'n':
show_numa = 1;
break;
+ case 'o':
+ show_ops = 1;
+ break;
+ case 'r':
+ show_report = 1;
+ break;
case 's':
shrink = 1;
break;
@@ -914,8 +1192,8 @@
}
- if (!show_slab && !show_alias && !show_track
- && !validate && !shrink)
+ if (!show_slab && !show_alias && !show_track && !show_report
+ && !validate && !shrink && !set_debug && !show_ops)
show_slab = 1;
if (argc > optind)