netdev - [PATCH 3/4] tools/vm/slabinfo: Add option to sort by partial slabs

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Date:   Fri, 26 Apr 2019 12:26:21 +1000
From:   "Tobin C. Harding" <tobin@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     "Tobin C. Harding" <tobin@...nel.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Pekka Enberg <penberg@....fi>,
        Vlastimil Babka <vbabka@...e.cz>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Tejun Heo <tj@...nel.org>, Qian Cai <cai@....pw>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Michal Hocko <mhocko@...nel.org>,
        Brendan Gregg <brendan.d.gregg@...il.com>, linux-mm@...ck.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] tools/vm/slabinfo: Add option to sort by partial slabs

We would like to get a better view of the level of fragmentation within
the SLUB allocator.  Total number of partial slabs is an indicator of
fragmentation.

Add a command line option (-P | --partial) to sort the slab list by
total number of partial slabs.

Signed-off-by: Tobin C. Harding <tobin@...nel.org>
---
 tools/vm/slabinfo.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/tools/vm/slabinfo.c b/tools/vm/slabinfo.c
index 3f3a2db65794..469ff6157986 100644
--- a/tools/vm/slabinfo.c
+++ b/tools/vm/slabinfo.c
@@ -111,7 +111,7 @@ 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 [-aABDefhilLnorsStTUvXz1] [N=K] [-dafzput] [slab-regexp]\n"
+		"slabinfo [-aABDefhilLnoPrsStTUvXz1] [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"
@@ -125,6 +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"
 		"-r|--report            Detailed report on single slabs\n"
 		"-s|--shrink            Shrink slabs\n"
 		"-S|--Size              Sort by size\n"
@@ -1361,6 +1362,7 @@ struct option opts[] = {
 	{ "numa", no_argument, NULL, 'n' },
 	{ "lines", required_argument, NULL, 'N'},
 	{ "ops", no_argument, NULL, 'o' },
+	{ "partial", no_argument, NULL, 'p'},
 	{ "report", no_argument, NULL, 'r' },
 	{ "shrink", no_argument, NULL, 's' },
 	{ "Size", no_argument, NULL, 'S'},
@@ -1382,7 +1384,7 @@ int main(int argc, char *argv[])
 
 	page_size = getpagesize();
 
-	while ((c = getopt_long(argc, argv, "aABd::DefhilLnN:orsStTUvXz1",
+	while ((c = getopt_long(argc, argv, "aABd::DefhilLnN:oPrsStTUvXz1",
 						opts, NULL)) != -1)
 		switch (c) {
 		case 'a':
@@ -1436,6 +1438,9 @@ int main(int argc, char *argv[])
 		case 'r':
 			show_report = 1;
 			break;
+		case 'P':
+			sort_partial = 1;
+			break;
 		case 's':
 			shrink = 1;
 			break;
-- 
2.21.0