tools/vm/slabinfo: introduce extended totals mode

Add "-X|--Xtotals" opt to output extended totals summary,
which includes:
-- totals summary
-- slabs sorted by size
-- slabs sorted by loss (waste)

Example:
=======

slabinfo --X -N 1
  Slabcache Totals
  ----------------
  Slabcaches :  91      Aliases  : 120->69  Active:  65
  Memory used: 568.3M   # Loss   :  30.4M   MRatio:     5%
  # Objects  : 920.1K   # PartObj: 161.2K   ORatio:    17%

  Per Cache    Average         Min         Max       Total
  ---------------------------------------------------------
  #Objects       14.1K           1      227.8K      920.1K
  #Slabs           533           1       11.7K       34.7K
  #PartSlab         86           0        4.3K        5.6K
  %PartSlab        24%          0%        100%         16%
  PartObjs          17           0      129.3K      161.2K
  % PartObj        17%          0%        100%         17%
  Memory          8.7M        8.1K      384.7M      568.3M
  Used            8.2M         160      366.5M      537.9M
  Loss          468.8K           0       18.2M       30.4M

  Per Object   Average         Min         Max
  ---------------------------------------------
  Memory           587           8        8.1K
  User             584           8        8.1K
  Loss               2           0          64

  Slabs sorted by size
  ----------------------
  Name                   Objects Objsize    Space Slabs/Part/Cpu  O/S O %Fr %Ef Flg
  ext4_inode_cache        211142    1736   384.7M    11732/40/10   18 3   0  95 a

  Slabs sorted by loss
  ----------------------
  Name                   Objects Objsize    Loss Slabs/Part/Cpu  O/S O %Fr %Ef Flg
  ext4_inode_cache        211142    1736    18.2M    11732/40/10   18 3   0  95 a

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>

1 files changed, 44 insertions, 10 deletions

diff --git a/tools/vm/slabinfo.c b/tools/vm/slabinfo.c
index de4974df4255..44b83ce352fd 100644
--- a/tools/vm/slabinfo.c
+++ b/tools/vm/slabinfo.c
@@ -81,6 +81,7 @@ int show_ops = 0;
 int show_activity = 0;
 int output_lines = -1;
 int sort_loss;
+int extended_totals;
 
 /* Debug options */
 int sanity = 0;
@@ -128,6 +129,7 @@ static void usage(void)
                 "-1|--1ref              Single reference\n"
                 "-N|--lines=K           Show the first K slabs\n"
                 "-L|--Loss              Sort by loss\n"
+                "-X|--Xtotals           Show extended summary information\n"
                 "\nValid debug options (FZPUT may be combined)\n"
                 "a / A          Switch on all debug options (=FZUP)\n"
                 "-              Switch off all debug options\n"
@@ -615,8 +617,7 @@ static void slabcache(struct slabinfo *s)
                         total_free ? (s->free_fastpath * 100 / total_free) : 0,
                         s->order_fallback, s->order, s->cmpxchg_double_fail,
                         s->cmpxchg_double_cpu_fail);
-        }
-        else
+        } else {
                 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,
@@ -624,6 +625,7 @@ static void slabcache(struct slabinfo *s)
                         s->slabs ? (s->objects * s->object_size * 100) /
                                 (s->slabs * (page_size << s->order)) : 100,
                         flags);
+        }
 }
 
 /*
@@ -1256,15 +1258,16 @@ static void read_slab_dir(void)
 static void output_slabs(void)
 {
         struct slabinfo *slab;
+        int lines = output_lines;
 
         for (slab = slabinfo; (slab < slabinfo + slabs) &&
-                        output_lines != 0; slab++) {
+                        lines != 0; slab++) {
 
                 if (slab->alias)
                         continue;
 
-                if (output_lines != -1)
-                        output_lines--;
+                if (lines != -1)
+                        lines--;
 
                 if (show_numa)
                         slab_numa(slab, 0);
@@ -1285,6 +1288,30 @@ static void output_slabs(void)
         }
 }
 
+static void xtotals(void)
+{
+        totals();
+
+        link_slabs();
+        rename_slabs();
+
+        printf("\nSlabs sorted by size\n");
+        printf("----------------------\n");
+        sort_loss = 0;
+        sort_size = 1;
+        sort_slabs();
+        output_slabs();
+
+        printf("\nSlabs sorted by loss\n");
+        printf("----------------------\n");
+        line = 0;
+        sort_loss = 1;
+        sort_size = 0;
+        sort_slabs();
+        output_slabs();
+        printf("\n");
+}
+
 struct option opts[] = {
         { "aliases", no_argument, NULL, 'a' },
         { "activity", no_argument, NULL, 'A' },
@@ -1307,6 +1334,7 @@ struct option opts[] = {
         { "1ref", no_argument, NULL, '1'},
         { "lines", required_argument, NULL, 'N'},
         { "Loss", no_argument, NULL, 'L'},
+        { "Xtotals", no_argument, NULL, 'X'},
         { NULL, 0, NULL, 0 }
 };
 
@@ -1318,7 +1346,7 @@ int main(int argc, char *argv[])
 
         page_size = getpagesize();
 
-        while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTSN:L",
+        while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTSN:LX",
                                                 opts, NULL)) != -1)
                 switch (c) {
                 case '1':
@@ -1390,6 +1418,11 @@ int main(int argc, char *argv[])
                 case 'L':
                         sort_loss = 1;
                         break;
+                case 'X':
+                        if (output_lines == -1)
+                                output_lines = 1;
+                        extended_totals = 1;
+                        break;
                 default:
                         fatal("%s: Invalid option '%c'\n", argv[0], optopt);
 
@@ -1409,12 +1442,13 @@ int main(int argc, char *argv[])
                 fatal("%s: Invalid pattern '%s' code %d\n",
                         argv[0], pattern_source, err);
         read_slab_dir();
-        if (show_alias)
+        if (show_alias) {
                 alias();
-        else
-        if (show_totals)
+        } else if (extended_totals) {
+                xtotals();
+        } else if (show_totals) {
                 totals();
-        else {
+        } else {
                 link_slabs();
                 rename_slabs();
                 sort_slabs();