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tools/vm/slabinfo: add partial slab listing to -X

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We would like to see how fragmented the SLUB allocator is, one window into
fragmentation is the total number of partial slabs.

Currently `slabinfo -X` shows slabs sorted by loss and by size.  We can
use this option to also show slabs sorted by number of partial slabs.

Option '-X' can be used in conjunction with '-N' to control the number of
slabs shown e.g.  list of top 5 slabs:

	slabinfo -X -N5

Add list of slabs ordered by number of partial slabs to output of
`slabinfo -X`.

Link: http://lkml.kernel.org/r/20190426022622.4089-3-tobin@kernel.org
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Cc: Alexander Duyck <alexander.duyck@gmail.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>,
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Pekka Enberg <penberg@iki.fi>
Cc: Qian Cai <cai@lca.pw>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tobin C. Harding 2019-07-11 20:59:38 -07:00 committed by Linus Torvalds
parent d914999689
commit 1106b205a3
1 changed files with 28 additions and 13 deletions
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41
tools/vm/slabinfo.c
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@ -79,6 +79,7 @@ int sort_size;
int sort_active;
int set_debug;
int show_ops;
int sort_partial;
int show_activity;
int output_lines = -1;
int sort_loss;
@ -1047,6 +1048,8 @@ static void sort_slabs(void)
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
result = strcasecmp(s1->name, s2->name);
@ -1307,27 +1310,39 @@ static void output_slabs(void)
}
}
static void _xtotals(char *heading, char *underline,
int loss, int size, int partial)
{
printf("%s%s", heading, underline);
line = 0;
sort_loss = loss;
sort_size = size;
sort_partial = partial;
sort_slabs();
output_slabs();
}
static void xtotals(void)
{
char *heading, *underline;
totals();
link_slabs();
rename_slabs();
printf("\nSlabs sorted by size\n");
printf("--------------------\n");
sort_loss = 0;
sort_size = 1;
sort_slabs();
output_slabs();
heading = "\nSlabs sorted by size\n";
underline = "--------------------\n";
_xtotals(heading, underline, 0, 1, 0);
heading = "\nSlabs sorted by loss\n";
underline = "--------------------\n";
_xtotals(heading, underline, 1, 0, 0);
heading = "\nSlabs sorted by number of partial slabs\n";
underline = "---------------------------------------\n";
_xtotals(heading, underline, 0, 0, 1);
printf("\nSlabs sorted by loss\n");
printf("--------------------\n");
line = 0;
sort_loss = 1;
sort_size = 0;
sort_slabs();
output_slabs();
printf("\n");
}