arcstat: Add -a and -p options from FreeNAS

Added -a option to automatically print all valid statistics.
Added -p option to suppress scaling of printed data.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Authored by: Nick Principe <32284693+powernap@users.noreply.github.com>
Ported-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #11090

cmd/arcstat/arcstat.in

@@ -134,12 +134,13 @@ opfile = None
 sep = "  "              # Default separator is 2 spaces
 version = "0.4"
 l2exist = False
-cmd = ("Usage: arcstat [-hvx] [-f fields] [-o file] [-s string] [interval "
+cmd = ("Usage: arcstat [-havxp] [-f fields] [-o file] [-s string] [interval "
        "[count]]\n")
 cur = {}
 d = {}
 out = None
 kstat = None
+pretty_print = True
 
 
 if sys.platform.startswith('freebsd'):
@@ -197,6 +198,7 @@ def detailed_usage():
 def usage():
     sys.stderr.write("%s\n" % cmd)
     sys.stderr.write("\t -h : Print this help message\n")
+    sys.stderr.write("\t -a : Print all possible stats\n")
     sys.stderr.write("\t -v : List all possible field headers and definitions"
                      "\n")
     sys.stderr.write("\t -x : Print extended stats\n")
@@ -204,6 +206,7 @@ def usage():
     sys.stderr.write("\t -o : Redirect output to the specified file\n")
     sys.stderr.write("\t -s : Override default field separator with custom "
                      "character or string\n")
+    sys.stderr.write("\t -p : Disable auto-scaling of numerical fields\n")
     sys.stderr.write("\nExamples:\n")
     sys.stderr.write("\tarcstat -o /tmp/a.log 2 10\n")
     sys.stderr.write("\tarcstat -s \",\" -o /tmp/a.log 2 10\n")
@@ -262,10 +265,14 @@ def print_values():
     global hdr
     global sep
     global v
+    global pretty_print
 
-    sys.stdout.write(sep.join(
-      prettynum(cols[col][0], cols[col][1], v[col]) for col in hdr))
+    if pretty_print:
+        fmt = lambda col: prettynum(cols[col][0], cols[col][1], v[col])
+    else:
+        fmt = lambda col: v[col]
 
+    sys.stdout.write(sep.join(fmt(col) for col in hdr))
     sys.stdout.write("\n")
     sys.stdout.flush()
 
@@ -273,9 +280,14 @@ def print_values():
 def print_header():
     global hdr
     global sep
+    global pretty_print
 
-    sys.stdout.write(sep.join("%*s" % (cols[col][0], col) for col in hdr))
+    if pretty_print:
+        fmt = lambda col: "%*s" % (cols[col][0], col)
+    else:
+        fmt = lambda col: col
 
+    sys.stdout.write(sep.join(fmt(col) for col in hdr))
     sys.stdout.write("\n")
 
 
@@ -312,8 +324,10 @@ def init():
     global sep
     global out
     global l2exist
+    global pretty_print
 
     desired_cols = None
+    aflag = False
     xflag = False
     hflag = False
     vflag = False
@@ -322,14 +336,16 @@ def init():
     try:
         opts, args = getopt.getopt(
             sys.argv[1:],
-            "xo:hvs:f:",
+            "axo:hvs:f:p",
             [
+                "all",
                 "extended",
                 "outfile",
                 "help",
                 "verbose",
                 "separator",
-                "columns"
+                "columns",
+                "parsable"
             ]
         )
     except getopt.error as msg:
@@ -338,6 +354,8 @@ def init():
         opts = None
 
     for opt, arg in opts:
+        if opt in ('-a', '--all'):
+            aflag = True
         if opt in ('-x', '--extended'):
             xflag = True
         if opt in ('-o', '--outfile'):
@@ -353,6 +371,8 @@ def init():
         if opt in ('-f', '--columns'):
             desired_cols = arg
             i += 1
+        if opt in ('-p', '--parsable'):
+            pretty_print = False
         i += 1
 
     argv = sys.argv[i:]
@@ -397,6 +417,12 @@ def init():
                              incompat)
             usage()
 
+    if aflag:
+        if l2exist:
+            hdr = cols.keys()
+        else:
+            hdr = [col for col in cols.keys() if not col.startswith("l2")]
+
     if opfile:
         try:
             out = open(opfile, "w")

man/man1/arcstat.1

@@ -13,13 +13,13 @@
 .\" Copyright (c) 2015 by Delphix. All rights reserved.
 .\" Copyright (c) 2020 by AJ Jordan. All rights reserved.
 .\"
-.TH ARCSTAT 1 "Aug 24, 2020" OpenZFS
+.TH ARCSTAT 1 "Oct 20, 2020" OpenZFS
 .SH NAME
 arcstat \- report ZFS ARC and L2ARC statistics
 .SH SYNOPSIS
 .LP
 .nf
-\fBarcstat\fR [\fB-hvx\fR] [\fB-f field[,field]...\fR] [\fB-o file\fR] [\fB-s string\fR] [\fBinterval\fR [\fBcount\fR]]
+\fBarcstat\fR [\fB-havxp\fR] [\fB-f field[,field]...\fR] [\fB-o file\fR] [\fB-s string\fR] [\fBinterval\fR [\fBcount\fR]]
 .fi
 
 .SH DESCRIPTION
@@ -510,6 +510,15 @@ May temporarily be negative, in which case the ARC will reduce the target size \
 .LP
 The following options are supported:
 
+.sp
+.ne 2
+.na
+\fB\fB-a\fR\fR
+.ad
+.RS 12n
+Print all possible stats.
+.RE
+
 .sp
 .ne 2
 .na
@@ -537,6 +546,15 @@ Display help message.
 Report statistics to a file instead of the standard output.
 .RE
 
+.sp
+.ne 2
+.na
+\fB\fB-p\fR\fR
+.ad
+.RS 12n
+Disable auto-scaling of numerical fields (for raw, machine-parsable values).
+.RE
+
 .sp
 .ne 2
 .na