tools/vm/slabinfo: order command line options

During recent discussion on LKML over SLAB vs SLUB it was suggested by
Jesper that it would be nice to have a tool to view the current
fragmentation of the slab allocators.  CC list for this set is taken
from that thread.

For SLUB we have all the information for this already exposed by the
kernel and also we have a userspace tool for displaying this info:

	tools/vm/slabinfo.c

Extend slabinfo to improve the fragmentation information by enabling
sorting of caches by number of partial slabs.

Also add cache list sorted in this manner to the output of `slabinfo -X`.

This patch (of 4):

get_opt() has a spurious character within the option string.  Remove it
and reorder the options in alphabetic order so that it is easier to keep
the options correct.  Use the same ordering for command help output and
long option handling code.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Tobin C. Harding <[email protected]>
Cc: Jesper Dangaard Brouer <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Qian Cai <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Alexander Duyck <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Brendan Gregg <[email protected]>,
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

tools/vm/slabinfo.c

@@ -110,7 +110,7 @@ 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 [-aADefhilnosrStTvz1LXBU] [N=K] [-dafzput] [slab-regexp]\n"
+		"slabinfo [-aABDefhilLnorsStTUvXz1] [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"
@@ -131,9 +131,9 @@ static void usage(void)
 		"-T|--Totals            Show summary information\n"
 		"-U|--Unreclaim         Show unreclaimable slabs only\n"
 		"-v|--validate          Validate slabs\n"
+		"-X|--Xtotals           Show extended summary information\n"
 		"-z|--zero              Include empty slabs\n"
 		"-1|--1ref              Single reference\n"
-		"-X|--Xtotals           Show extended summary information\n"
 
 		"\n"
 		"-d  | --debug          Switch off all debug options\n"
@@ -1334,28 +1334,28 @@ static void xtotals(void)
 struct option opts[] = {
 	{ "aliases", no_argument, NULL, 'a' },
 	{ "activity", no_argument, NULL, 'A' },
+	{ "Bytes", no_argument, NULL, 'B'},
 	{ "debug", optional_argument, NULL, 'd' },
 	{ "display-activity", no_argument, NULL, 'D' },
 	{ "empty", no_argument, NULL, 'e' },
 	{ "first-alias", no_argument, NULL, 'f' },
 	{ "help", no_argument, NULL, 'h' },
 	{ "inverted", no_argument, NULL, 'i'},
 	{ "slabs", no_argument, NULL, 'l' },
+	{ "Loss", no_argument, NULL, 'L'},
 	{ "numa", no_argument, NULL, 'n' },
+	{ "lines", required_argument, NULL, 'N'},
 	{ "ops", no_argument, NULL, 'o' },
-	{ "shrink", no_argument, NULL, 's' },
 	{ "report", no_argument, NULL, 'r' },
+	{ "shrink", no_argument, NULL, 's' },
 	{ "Size", no_argument, NULL, 'S'},
 	{ "tracking", no_argument, NULL, 't'},
 	{ "Totals", no_argument, NULL, 'T'},
+	{ "Unreclaim", no_argument, NULL, 'U'},
 	{ "validate", no_argument, NULL, 'v' },
+	{ "Xtotals", no_argument, NULL, 'X'},
 	{ "zero", no_argument, NULL, 'z' },
 	{ "1ref", no_argument, NULL, '1'},
-	{ "lines", required_argument, NULL, 'N'},
-	{ "Loss", no_argument, NULL, 'L'},
-	{ "Xtotals", no_argument, NULL, 'X'},
-	{ "Bytes", no_argument, NULL, 'B'},
-	{ "Unreclaim", no_argument, NULL, 'U'},
 	{ NULL, 0, NULL, 0 }
 };
 
@@ -1367,18 +1367,18 @@ int main(int argc, char *argv[])
 
 	page_size = getpagesize();
 
-	while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTSN:LXBU",
+	while ((c = getopt_long(argc, argv, "aABd::DefhilLnN:orsStTUvXz1",
 						opts, NULL)) != -1)
 		switch (c) {
-		case '1':
-			show_single_ref = 1;
-			break;
 		case 'a':
 			show_alias = 1;
 			break;
 		case 'A':
 			sort_active = 1;
 			break;
+		case 'B':
+			show_bytes = 1;
+			break;
 		case 'd':
 			set_debug = 1;
 			if (!debug_opt_scan(optarg))
@@ -1399,9 +1399,22 @@ int main(int argc, char *argv[])
 		case 'i':
 			show_inverted = 1;
 			break;
+		case 'l':
+			show_slab = 1;
+			break;
+		case 'L':
+			sort_loss = 1;
+			break;
 		case 'n':
 			show_numa = 1;
 			break;
+		case 'N':
+			if (optarg) {
+				output_lines = atoi(optarg);
+				if (output_lines < 1)
+					output_lines = 1;
+			}
+			break;
 		case 'o':
 			show_ops = 1;
 			break;
@@ -1411,45 +1424,32 @@ int main(int argc, char *argv[])
 		case 's':
 			shrink = 1;
 			break;
-		case 'l':
-			show_slab = 1;
+		case 'S':
+			sort_size = 1;
 			break;
 		case 't':
 			show_track = 1;
 			break;
-		case 'v':
-			validate = 1;
-			break;
-		case 'z':
-			skip_zero = 0;
-			break;
 		case 'T':
 			show_totals = 1;
 			break;
-		case 'S':
-			sort_size = 1;
-			break;
-		case 'N':
-			if (optarg) {
-				output_lines = atoi(optarg);
-				if (output_lines < 1)
-					output_lines = 1;
-			}
+		case 'U':
+			unreclaim_only = 1;
 			break;
-		case 'L':
-			sort_loss = 1;
+		case 'v':
+			validate = 1;
 			break;
 		case 'X':
 			if (output_lines == -1)
 				output_lines = 1;
 			extended_totals = 1;
 			show_bytes = 1;
 			break;
-		case 'B':
-			show_bytes = 1;
+		case 'z':
+			skip_zero = 0;
 			break;
-		case 'U':
-			unreclaim_only = 1;
+		case '1':
+			show_single_ref = 1;
 			break;
 		default:
 			fatal("%s: Invalid option '%c'\n", argv[0], optopt);