Add a new line to top that provides a brief summary of the ZFS ARC memory

usage on hosts using ZFS.  The new line displays the total amount of RAM
used by the ARC along with the size of MFU, MRU, anonymous (in flight),
headers, and other (miscellaneous) sub-categories.  The line is not
displayed on systems that are not using ZFS.

Reviewed by:	avg, fs@
MFC after:	3 days

4 files changed, 55 insertions, 0 deletions

diff --git a/contrib/top/display.c b/contrib/top/display.c
index 89795c05e4da..e65ae24f528f 100644
--- a/contrib/top/display.c
+++ b/contrib/top/display.c
@@ -66,6 +66,7 @@ char *screenbuf = NULL;
 static char **procstate_names;
 static char **cpustate_names;
 static char **memory_names;
+static char **arc_names;
 static char **swap_names;
 
 static int num_procstates;
@@ -100,6 +101,8 @@ int  x_brkdn =		15;
 int  y_brkdn =		1;
 int  x_mem =		5;
 int  y_mem =		3;
+int  x_arc =		5;
+int  y_arc =		4;
 int  x_swap =		6;
 int  y_swap =		4;
 int  y_message =	5;
@@ -216,6 +219,8 @@ struct statics *statics;
 	num_memory = string_count(memory_names);
 	lmemory = (int *)malloc(num_memory * sizeof(int));
 
+	arc_names = statics->arc_names;
+	
 	/* calculate starting columns where needed */
 	cpustate_total_length = 0;
 	pp = cpustate_names;
@@ -627,6 +632,46 @@ int *stats;
 }
 
 /*
+ *  *_arc(stats) - print "ARC: " followed by the ARC summary string
+ *
+ *  Assumptions:  cursor is on "lastline"
+ *                for i_arc ONLY: cursor is on the previous line
+ */
+char arc_buffer[MAX_COLS];
+
+i_arc(stats)
+
+int *stats;
+
+{
+    if (arc_names == NULL)
+	return (0);
+
+    fputs("\nARC: ", stdout);
+    lastline++;
+
+    /* format and print the memory summary */
+    summary_format(arc_buffer, stats, arc_names);
+    fputs(arc_buffer, stdout);
+}
+
+u_arc(stats)
+
+int *stats;
+
+{
+    static char new[MAX_COLS];
+
+    if (arc_names == NULL)
+	return (0);
+
+    /* format the new line */
+    summary_format(new, stats, arc_names);
+    line_update(arc_buffer, new, x_arc, y_arc);
+}
+
+ 
+/*
  *  *_swap(stats) - print "Swap: " followed by the swap summary string
  *
  *  Assumptions:  cursor is on "lastline"
diff --git a/contrib/top/layout.h b/contrib/top/layout.h
index 1b2564e0a657..a04fce215b07 100644
--- a/contrib/top/layout.h
+++ b/contrib/top/layout.h
@@ -19,6 +19,8 @@ extern int  x_brkdn;		/* 15 */
 extern int  y_brkdn;		/* 1 */
 extern int  x_mem;		/* 5 */
 extern int  y_mem;		/* 3 */
+extern int  x_arc;		/* 5 */
+extern int  y_arc;		/* 4 */
 extern int  x_swap;		/* 6 */
 extern int  y_swap;		/* 4 */
 extern int  y_message;		/* 5 */
diff --git a/contrib/top/machine.h b/contrib/top/machine.h
index 3e1af1609ece..699c7554df05 100644
--- a/contrib/top/machine.h
+++ b/contrib/top/machine.h
@@ -16,6 +16,7 @@ struct statics
     char **procstate_names;
     char **cpustate_names;
     char **memory_names;
+    char **arc_names;
     char **swap_names;
 #ifdef ORDER
     char **order_names;
@@ -42,6 +43,7 @@ struct system_info
     int    *procstates;
     int    *cpustates;
     int    *memory;
+    int    *arc;
     int    *swap;
     struct timeval boottime;
     int    ncpus;
diff --git a/contrib/top/top.c b/contrib/top/top.c
index 50bc9b967b5f..c2eb35da1a99 100644
--- a/contrib/top/top.c
+++ b/contrib/top/top.c
@@ -121,6 +121,8 @@ int i_cpustates();
 int u_cpustates();
 int i_memory();
 int u_memory();
+int i_arc();
+int u_arc();
 int i_swap();
 int u_swap();
 int i_message();
@@ -135,6 +137,7 @@ int (*d_loadave)() = i_loadave;
 int (*d_procstates)() = i_procstates;
 int (*d_cpustates)() = i_cpustates;
 int (*d_memory)() = i_memory;
+int (*d_arc)() = i_arc;
 int (*d_swap)() = i_swap;
 int (*d_message)() = i_message;
 int (*d_header)() = i_header;
@@ -647,6 +650,7 @@ restart:
 
 	/* display memory stats */
 	(*d_memory)(system_info.memory);
+	(*d_arc)(system_info.arc);
 
 	/* display swap stats */
 	(*d_swap)(system_info.swap);
@@ -712,6 +716,7 @@ restart:
 		    d_procstates = u_procstates;
 		    d_cpustates = u_cpustates;
 		    d_memory = u_memory;
+		    d_arc = u_arc;
 		    d_swap = u_swap;
 		    d_message = u_message;
 		    d_header = u_header;
@@ -1129,6 +1134,7 @@ reset_display()
     d_procstates = i_procstates;
     d_cpustates  = i_cpustates;
     d_memory     = i_memory;
+    d_arc        = i_arc;
     d_swap       = i_swap;
     d_message	 = i_message;
     d_header	 = i_header;