[RFC PATCH v2 02/14] tools/vm/slabinfo: Add support for -C and -M options

Tobin C. Harding
2019-04-03T04:32:11Z

-C lists caches that use a ctor.

-M lists caches that support object migration.

Add command line options to show caches with a constructor and caches
that are movable (i.e. have migrate function).

Co-developed-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
---
tools/vm/slabinfo.c | 40 ++++++++++++++++++++++++++++++++++++----
1 file changed, 36 insertions(+), 4 deletions(-)

diff --git a/tools/vm/slabinfo.c b/tools/vm/slabinfo.c
index 73818f1b2ef8..cbfc56c44c2f 100644
--- a/tools/vm/slabinfo.c
+++ b/tools/vm/slabinfo.c
@@ -33,6 +33,7 @@ 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;
unsigned long partial, objects, slabs, objects_partial, objects_total;
unsigned long alloc_fastpath, alloc_slowpath;
unsigned long free_fastpath, free_slowpath;
@@ -67,6 +68,8 @@ 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;
@@ -109,11 +112,13 @@ 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 [-aADefhilnosrStTvz1LXBU] [N=K] [-dafzput] [slab-regexp]\n"
+ printf("slabinfo 4/15/2017. (c) 2007 sgi/(c) 2011 Linux Foundation/(c) 2017 Jump Trading LLC.\n\n"
+ "slabinfo [-aACDefhilMnosrStTvz1LXBU] [N=K] [-dafzput] [slab-regexp]\n"
+
"-a|--aliases Show aliases\n"
"-A|--activity Most active slabs first\n"
"-B|--Bytes Show size in bytes\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"
@@ -121,6 +126,7 @@ static void usage(void)
"-i|--inverted Inverted list\n"
"-l|--slabs Show slabs\n"
"-L|--Loss Sort by loss\n"
+ "-M|--movable Show caches that support movable objects\n"
"-n|--numa Show NUMA information\n"
"-N|--lines=K Show the first K slabs\n"
"-o|--ops Show kmem_cache_ops\n"
@@ -588,6 +594,12 @@ static void slabcache(struct slabinfo *s)
if (show_empty && s->slabs)
return;

+ if (show_ctor && !s->ctor)
+ return;
+
+ if (show_movable && !s->movable)
+ return;
+
if (sort_loss == 0)
store_size(size_str, slab_size(s));
else
@@ -602,6 +614,10 @@ static void slabcache(struct slabinfo *s)
*p++ = '*';
if (s->cache_dma)
*p++ = 'd';
+ if (s->ctor)
+ *p++ = 'C';
+ if (s->movable)
+ *p++ = 'M';
if (s->hwcache_align)
*p++ = 'A';
if (s->poison)
@@ -636,7 +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);
@@ -1256,6 +1273,13 @@ static void read_slab_dir(void)
slab->alloc_node_mismatch = get_obj("alloc_node_mismatch");
slab->deactivate_bypass = get_obj("deactivate_bypass");
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++;
@@ -1332,6 +1356,8 @@ static void xtotals(void)
}

struct option opts[] = {
+ { "ctor", no_argument, NULL, 'C' },
+ { "movable", no_argument, NULL, 'M' },
{ "aliases", no_argument, NULL, 'a' },
{ "activity", no_argument, NULL, 'A' },
{ "debug", optional_argument, NULL, 'd' },
@@ -1367,7 +1393,7 @@ 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::Defhil1MnoprstvzTSN:LXBU",
opts, NULL)) != -1)
switch (c) {
case '1':
@@ -1376,6 +1402,9 @@ int main(int argc, char *argv[])
case 'a':
show_alias = 1;
break;
+ case 'C':
+ show_ctor = 1;
+ break;
case 'A':
sort_active = 1;
break;
@@ -1399,6 +1428,9 @@ int main(int argc, char *argv[])
case 'i':
show_inverted = 1;
break;
+ case 'M':
+ show_movable = 1;
+ break;
case 'n':
show_numa = 1;
break;
--
2.21.0