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tools/vm/slabinfo: use alphabetic order when two values are equal

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commit 4f5ceb8851 upstream.

When the number of partial slabs in each cache is the same (e.g., the
value are 0), the results of the `slabinfo -X -N5` and `slabinfo -P -N5`
are different.

/ # slabinfo -X -N5
...
Slabs sorted by number of partial slabs
---------------------------------------
Name                   Objects Objsize           Space Slabs/Part/Cpu  O/S O %Fr %Ef Flg
inode_cache              15180     392         6217728        758/0/1   20 1   0  95 a
kernfs_node_cache        22494      88         2002944        488/0/1   46 0   0  98
shmem_inode_cache          663     464          319488         38/0/1   17 1   0  96
biovec-max                  50    3072          163840          4/0/1   10 3   0  93 A
dentry                   19050     136         2600960        633/0/2   30 0   0  99 a

/ # slabinfo -P -N5
Name                   Objects Objsize           Space Slabs/Part/Cpu  O/S O %Fr %Ef Flg
bdev_cache                  32     984           32.7K          1/0/1   16 2   0  96 Aa
ext4_inode_cache            42     752           32.7K          1/0/1   21 2   0  96 a
dentry                   19050     136            2.6M        633/0/2   30 0   0  99 a
TCPv6                       17    1840           32.7K          0/0/1   17 3   0  95 A
RAWv6                       18     856           16.3K          0/0/1   18 2   0  94 A

This problem is caused by the sort_slabs().  So let's use alphabetic order
when two values are equal in the sort_slabs().

By the way, the content of the `slabinfo -h` is not aligned because the

`-P|--partial Sort by number of partial slabs`

uses tabs instead of spaces.  So let's use spaces instead of tabs to fix
it.

Link: https://lkml.kernel.org/r/20220528063117.935158-1-songyuanzheng@huawei.com
Fixes: 1106b205a3 ("tools/vm/slabinfo: add partial slab listing to -X")
Signed-off-by: Yuanzheng Song <songyuanzheng@huawei.com>
Cc: "Tobin C. Harding" <tobin@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yuanzheng Song
2022-05-28 06:31:17 +00:00
committed by Greg Kroah-Hartman
parent 97cea2cb7c
commit eea0d84a4f
1 changed files with 22 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
tools/vm/slabinfo.c
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@@ -125,7 +125,7 @@ static void usage(void)
"-n|--numa Show NUMA information\n"
"-N|--lines=K Show the first K slabs\n"
"-o|--ops Show kmem_cache_ops\n"
"-P|--partial Sort by number of partial slabs\n"
"-P|--partial Sort by number of partial slabs\n"
"-r|--report Detailed report on single slabs\n"
"-s|--shrink Shrink slabs\n"
"-S|--Size Sort by size\n"
@@ -1045,15 +1045,27 @@ static void sort_slabs(void)
for (s2 = s1 + 1; s2 < slabinfo + slabs; s2++) {
int result;
if (sort_size)
result = slab_size(s1) < slab_size(s2);
else if (sort_active)
result = slab_activity(s1) < slab_activity(s2);
else if (sort_loss)
result = slab_waste(s1) < slab_waste(s2);
else if (sort_partial)
result = s1->partial < s2->partial;
else
if (sort_size) {
if (slab_size(s1) == slab_size(s2))
result = strcasecmp(s1->name, s2->name);
else
result = slab_size(s1) < slab_size(s2);
} else if (sort_active) {
if (slab_activity(s1) == slab_activity(s2))
result = strcasecmp(s1->name, s2->name);
else
result = slab_activity(s1) < slab_activity(s2);
} else if (sort_loss) {
if (slab_waste(s1) == slab_waste(s2))
result = strcasecmp(s1->name, s2->name);
else
result = slab_waste(s1) < slab_waste(s2);
} else if (sort_partial) {
if (s1->partial == s2->partial)
result = strcasecmp(s1->name, s2->name);
else
result = s1->partial < s2->partial;
} else
result = strcasecmp(s1->name, s2->name);
if (show_inverted)