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Subject[RFC 6/7] slub: Extend slabinfo to support -D and -F options
-F lists caches that support moving and 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.

Signed-off-by: Christoph Lameter <cl@linux.com>

---
Documentation/vm/slabinfo.c | 48 +++++++++++++++++++++++++++++++++++++++-----
1 file changed, 43 insertions(+), 5 deletions(-)

Index: linux/tools/vm/slabinfo.c
===================================================================
--- linux.orig/tools/vm/slabinfo.c
+++ linux/tools/vm/slabinfo.c
@@ -33,6 +33,8 @@ struct slabinfo {
unsigned int hwcache_align, object_size, objs_per_slab;
unsigned int sanity_checks, slab_size, store_user, trace;
int order, poison, reclaim_account, red_zone;
+ int movable, ctor;
+ int defrag_ratio, remote_node_defrag_ratio;
unsigned long partial, objects, slabs, objects_partial, objects_total;
unsigned long alloc_fastpath, alloc_slowpath;
unsigned long free_fastpath, free_slowpath;
@@ -67,6 +69,8 @@ int show_report;
int show_alias;
int show_slab;
int skip_zero = 1;
+int show_movable;
+int show_ctor;
int show_numa;
int show_track;
int show_first_alias;
@@ -109,14 +113,16 @@ static void fatal(const char *x, ...)

static void usage(void)
{
- printf("slabinfo 4/15/2011. (c) 2007 sgi/(c) 2011 Linux Foundation.\n\n"
- "slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
+ printf("slabinfo 4/15/2017. (c) 2007 sgi/(c) 2011 Linux Foundation/(c) 2017 Jump Trading LLC.\n\n"
+ "slabinfo [-aCdDefFhnpvtsz] [-d debugopts] [slab-regexp]\n"
"-a|--aliases Show aliases\n"
"-A|--activity Most active slabs first\n"
"-d<options>|--debug=<options> Set/Clear Debug options\n"
+ "-C|--ctor Show slabs with ctors\n"
"-D|--display-active Switch line format to activity\n"
"-e|--empty Show empty slabs\n"
"-f|--first-alias Show first alias\n"
+ "-F|--movable Show caches that support movable objects\n"
"-h|--help Show usage information\n"
"-i|--inverted Inverted list\n"
"-l|--slabs Show slabs\n"
@@ -369,7 +375,7 @@ static void slab_numa(struct slabinfo *s
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----------------------");
@@ -378,6 +384,7 @@ static void slab_numa(struct slabinfo *s
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];

@@ -535,6 +542,8 @@ static void report(struct slabinfo *s)
printf("** Slabs are destroyed via RCU\n");
if (s->reclaim_account)
printf("** Reclaim accounting active\n");
+ if (s->movable)
+ printf("** Defragmentation at %d%%\n", s->defrag_ratio);

printf("\nSizes (bytes) Slabs Debug Memory\n");
printf("------------------------------------------------------------------------\n");
@@ -585,6 +594,12 @@ static void slabcache(struct slabinfo *s
if (show_empty && s->slabs)
return;

+ if (show_movable && !s->movable)
+ return;
+
+ if (show_ctor && !s->ctor)
+ return;
+
if (sort_loss == 0)
store_size(size_str, slab_size(s));
else
@@ -599,6 +614,10 @@ static void slabcache(struct slabinfo *s
*p++ = '*';
if (s->cache_dma)
*p++ = 'd';
+ if (s->movable)
+ *p++ = 'F';
+ if (s->ctor)
+ *p++ = 'C';
if (s->hwcache_align)
*p++ = 'A';
if (s->poison)
@@ -633,7 +652,8 @@ static void slabcache(struct slabinfo *s
printf("%-21s %8ld %7d %15s %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->partial * 100) /
+ (s->slabs * s->objs_per_slab) : 100,
s->slabs ? (s->objects * s->object_size * 100) /
(s->slabs * (page_size << s->order)) : 100,
flags);
@@ -1252,7 +1272,17 @@ static void read_slab_dir(void)
slab->cpu_partial_free = get_obj("cpu_partial_free");
slab->alloc_node_mismatch = get_obj("alloc_node_mismatch");
slab->deactivate_bypass = get_obj("deactivate_bypass");
+ 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, "migrate :"))
+ slab->movable = 1;
+ }
+
if (slab->name[0] == ':')
alias_targets++;
slab++;
@@ -1329,6 +1359,8 @@ static void xtotals(void)
}

struct option opts[] = {
+ { "ctor", no_argument, NULL, 'C' },
+ { "movable", no_argument, NULL, 'F' },
{ "aliases", no_argument, NULL, 'a' },
{ "activity", no_argument, NULL, 'A' },
{ "debug", optional_argument, NULL, 'd' },
@@ -1364,7 +1396,7 @@ int main(int argc, char *argv[])

page_size = getpagesize();

- while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTSN:LXBU",
+ while ((c = getopt_long(argc, argv, "aACd::DefFhil1noprstvzTSN:LXBU",
opts, NULL)) != -1)
switch (c) {
case '1':
@@ -1420,6 +1452,12 @@ int main(int argc, char *argv[])
case 'z':
skip_zero = 0;
break;
+ case 'C':
+ show_ctor = 1;
+ break;
+ case 'F':
+ show_movable = 1;
+ break;
case 'T':
show_totals = 1;
break;
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