libbpf-tools/memleak: Fixes off-by-one error for -Z and -z option (…

…iovisor#5149)

These are the description of each options written in memleak tool
(libbpf-tools and tools directory):
  -z option: capture only allocations larger than this size
  -Z option: capture only allocations smaller than this size

But actually they work like this
  -z option: capture only allocations larger than or equal to this size
  -Z option: capture only allocations smaller than or equal to this size

Which means, there was off-by-one errors. So, fixes the explanation message.

libbpf-tools/memleak.c

@@ -200,8 +200,8 @@ static const struct argp_option argp_options[] = {
 	{"wa-missing-free", 'F', 0, 0, "workaround to alleviate misjudgments when free is missing", 0 },
 	{"sample-rate", 's', "SAMPLE_RATE", 0, "sample every N-th allocation to decrease the overhead", 0 },
 	{"top", 'T', "TOP_STACKS", 0, "display only this many top allocating stacks (by size)", 0 },
-	{"min-size", 'z', "MIN_SIZE", 0, "capture only allocations larger than this size", 0 },
-	{"max-size", 'Z', "MAX_SIZE", 0, "capture only allocations smaller than this size", 0 },
+	{"min-size", 'z', "MIN_SIZE", 0, "capture only allocations larger than or equal to this size", 0 },
+	{"max-size", 'Z', "MAX_SIZE", 0, "capture only allocations smaller than or equal to this size", 0 },
 	{"obj", 'O', "OBJECT", 0, "attach to allocator functions in the specified object", 0 },
 	{"percpu", 'P', NULL, 0, "trace percpu allocations", 0 },
 	{"symbols-prefix", 'S', "SYMBOLS_PREFIX", 0, "memory allocator symbols prefix", 0 },

tools/memleak.py

@@ -104,9 +104,9 @@ def run_command_get_pid(command):
 parser.add_argument("-T", "--top", type=int, default=10,
         help="display only this many top allocating stacks (by size)")
 parser.add_argument("-z", "--min-size", type=int,
-        help="capture only allocations larger than this size")
+        help="capture only allocations larger than or equal to this size")
 parser.add_argument("-Z", "--max-size", type=int,
-        help="capture only allocations smaller than this size")
+        help="capture only allocations smaller than or equal to this size")
 parser.add_argument("-O", "--obj", type=str, default="c",
         help="attach to allocator functions in the specified object")
 parser.add_argument("--ebpf", action="store_true",

tools/memleak_example.txt

@@ -217,9 +217,9 @@ optional arguments:
                         sample every N-th allocation to decrease the overhead
   -T TOP, --top TOP     display only this many top allocating stacks (by size)
   -z MIN_SIZE, --min-size MIN_SIZE
-                        capture only allocations larger than this size
+                        capture only allocations larger than or equal to this size
   -Z MAX_SIZE, --max-size MAX_SIZE
-                        capture only allocations smaller than this size
+                        capture only allocations smaller than or equal to this size
   -O OBJ, --obj OBJ     attach to allocator functions in the specified object
   --sort KEY            report sorted in given key; available key list: size,
                         count