From a93edde1a21e533472b5d443002032260b5bd066 Mon Sep 17 00:00:00 2001
From: Ross Williams <ross@ross-williams.net>
Date: Sat, 6 Jul 2019 04:27:49 +0000
Subject: Support ZFS ARC stats on FreeBSD

New meter displays same ARC stats as FreeBSD top(1).
Can be extended to other platforms that support ZFS.

Pulling kstat.zfs.misc.arcstats.c_max as the meter
total, so the meter has a meaningful value to work
up to.

The Text meter displays, first, the maximum
ARC size (Meter.total), then second, the total
ARC used, using the difference between Meter.maxItems
and Meter.curItems to "hide" the used value from the
Bar and Graph drawing functions by using an index
in Meter.values[] that is beyond curItems - 1, but
less than maxItems - 1.
---
 zfs/ZfsArcMeter.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 zfs/ZfsArcMeter.h | 18 +++++++++++++
 2 files changed, 99 insertions(+)
 create mode 100644 zfs/ZfsArcMeter.c
 create mode 100644 zfs/ZfsArcMeter.h

(limited to 'zfs')

diff --git a/zfs/ZfsArcMeter.c b/zfs/ZfsArcMeter.c
new file mode 100644
index 00000000..e12c46e2
--- /dev/null
+++ b/zfs/ZfsArcMeter.c
@@ -0,0 +1,81 @@
+/*
+htop - ZfsArcMeter.c
+(C) 2004-2011 Hisham H. Muhammad
+Released under the GNU GPL, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "ZfsArcMeter.h"
+
+#include "CRT.h"
+#include "Platform.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <sys/param.h>
+#include <assert.h>
+
+/*{
+#include "Meter.h"
+}*/
+
+int ZfsArcMeter_attributes[] = {
+   ZFS_MFU, ZFS_MRU, ZFS_ANON, ZFS_HEADER, ZFS_OTHER
+};
+
+static void ZfsArcMeter_updateValues(Meter* this, char* buffer, int size) {
+   int written;
+   Platform_setZfsArcValues(this);
+
+   written = Meter_humanUnit(buffer, this->values[5], size);
+   buffer += written;
+   if ((size -= written) > 0) {
+      *buffer++ = '/';
+      size--;
+      Meter_humanUnit(buffer, this->total, size);
+   }
+}
+
+static void ZfsArcMeter_display(Object* cast, RichString* out) {
+   char buffer[50];
+   Meter* this = (Meter*)cast;
+
+   RichString_write(out, CRT_colors[METER_TEXT], ":");
+   Meter_humanUnit(buffer, this->total, 50);
+   RichString_append(out, CRT_colors[METER_VALUE], buffer);
+   Meter_humanUnit(buffer, this->values[5], 50);
+   RichString_append(out, CRT_colors[METER_TEXT], " Used:");
+   RichString_append(out, CRT_colors[METER_VALUE], buffer);
+   Meter_humanUnit(buffer, this->values[0], 50);
+   RichString_append(out, CRT_colors[METER_TEXT], " MFU:");
+   RichString_append(out, CRT_colors[ZFS_MFU], buffer);
+   Meter_humanUnit(buffer, this->values[1], 50);
+   RichString_append(out, CRT_colors[METER_TEXT], " MRU:");
+   RichString_append(out, CRT_colors[ZFS_MRU], buffer);
+   Meter_humanUnit(buffer, this->values[2], 50);
+   RichString_append(out, CRT_colors[METER_TEXT], " Anon:");
+   RichString_append(out, CRT_colors[ZFS_ANON], buffer);
+   Meter_humanUnit(buffer, this->values[3], 50);
+   RichString_append(out, CRT_colors[METER_TEXT], " Hdr:");
+   RichString_append(out, CRT_colors[ZFS_HEADER], buffer);
+   Meter_humanUnit(buffer, this->values[4], 50);
+   RichString_append(out, CRT_colors[METER_TEXT], " Oth:");
+   RichString_append(out, CRT_colors[ZFS_OTHER], buffer);
+}
+
+MeterClass ZfsArcMeter_class = {
+   .super = {
+      .extends = Class(Meter),
+      .delete = Meter_delete,
+      .display = ZfsArcMeter_display,
+   },
+   .updateValues = ZfsArcMeter_updateValues, 
+   .defaultMode = TEXT_METERMODE,
+   .maxItems = 6,
+   .total = 100.0,
+   .attributes = ZfsArcMeter_attributes,
+   .name = "ZFSARC",
+   .uiName = "ZFS ARC",
+   .caption = "ARC"
+};
diff --git a/zfs/ZfsArcMeter.h b/zfs/ZfsArcMeter.h
new file mode 100644
index 00000000..b89be223
--- /dev/null
+++ b/zfs/ZfsArcMeter.h
@@ -0,0 +1,18 @@
+/* Do not edit this file. It was automatically generated. */
+
+#ifndef HEADER_ZfsArcMeter
+#define HEADER_ZfsArcMeter
+/*
+htop - ZfsArcMeter.h
+(C) 2004-2011 Hisham H. Muhammad
+Released under the GNU GPL, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "Meter.h"
+
+extern int ZfsArcMeter_attributes[];
+
+extern MeterClass ZfsArcMeter_class;
+
+#endif
-- 
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