[Xen-devel] [PATCH] xentop: Dynamically expand some columns

["Charles Arnold" <carnold@xxxxxxxx>]

Allow certain xentop columns to automatically expand as the amount
of data reported gets larger.  The columns allowed to expand are:

NETTX(k), NETRX(k), VBD_RD, VBD_WR, VBD_RSECT, VBD_WSECT

Author: Markus Hauschild <Markus.Hauschild@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Charles Arnold <carnold@xxxxxxxx>

diff --git a/tools/xenstat/xentop/xentop.c b/tools/xenstat/xentop/xentop.c
index dd11927..d087665 100644
--- a/tools/xenstat/xentop/xentop.c
+++ b/tools/xenstat/xentop/xentop.c
@@ -27,6 +27,7 @@
 
 #include <ctype.h>
 #include <errno.h>
+#include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
@@ -127,7 +128,8 @@ static int compare_vbd_rsect(xenstat_domain *domain1, 
xenstat_domain *domain2);
 static void print_vbd_rsect(xenstat_domain *domain);
 static int compare_vbd_wsect(xenstat_domain *domain1, xenstat_domain *domain2);
 static void print_vbd_wsect(xenstat_domain *domain);
-
+static void reset_field_widths(void);
+static void adjust_field_widths(xenstat_domain *domain);
 
 /* Section printing functions */
 static void do_summary(void);
@@ -623,7 +625,7 @@ static int compare_net_tx(xenstat_domain *domain1, 
xenstat_domain *domain2)
 /* Prints number of total network tx bytes statistic */
 static void print_net_tx(xenstat_domain *domain)
 {
-       print("%8llu", tot_net_bytes(domain, FALSE)/1024);
+       print("%*llu", fields[FIELD_NET_TX-1].default_width, 
tot_net_bytes(domain, FALSE)/1024);
 }
 
 /* Compares number of total network rx bytes of two domains, returning -1,0,1
@@ -637,7 +639,7 @@ static int compare_net_rx(xenstat_domain *domain1, 
xenstat_domain *domain2)
 /* Prints number of total network rx bytes statistic */
 static void print_net_rx(xenstat_domain *domain)
 {
-       print("%8llu", tot_net_bytes(domain, TRUE)/1024);
+       print("%*llu", fields[FIELD_NET_RX-1].default_width, 
tot_net_bytes(domain, TRUE)/1024);
 }
 
 /* Gets number of total network bytes statistic, if rx true, then rx bytes
@@ -705,7 +707,7 @@ static int compare_vbd_rd(xenstat_domain *domain1, 
xenstat_domain *domain2)
 /* Prints number of total VBD READ requests statistic */
 static void print_vbd_rd(xenstat_domain *domain)
 {
-       print("%8llu", tot_vbd_reqs(domain, FIELD_VBD_RD));
+       print("%*llu", fields[FIELD_VBD_RD-1].default_width, 
tot_vbd_reqs(domain, FIELD_VBD_RD));
 }
 
 /* Compares number of total VBD WRITE requests of two domains,
@@ -719,7 +721,7 @@ static int compare_vbd_wr(xenstat_domain *domain1, 
xenstat_domain *domain2)
 /* Prints number of total VBD WRITE requests statistic */
 static void print_vbd_wr(xenstat_domain *domain)
 {
-       print("%8llu", tot_vbd_reqs(domain, FIELD_VBD_WR));
+       print("%*llu", fields[FIELD_VBD_WR-1].default_width, 
tot_vbd_reqs(domain, FIELD_VBD_WR));
 }
 
 /* Compares number of total VBD READ sectors of two domains,
@@ -733,7 +735,7 @@ static int compare_vbd_rsect(xenstat_domain *domain1, 
xenstat_domain *domain2)
 /* Prints number of total VBD READ sectors statistic */
 static void print_vbd_rsect(xenstat_domain *domain)
 {
-       print("%10llu", tot_vbd_reqs(domain, FIELD_VBD_RSECT));
+       print("%*llu", fields[FIELD_VBD_RSECT-1].default_width, 
tot_vbd_reqs(domain, FIELD_VBD_RSECT));
 }
 
 /* Compares number of total VBD WRITE sectors of two domains,
@@ -747,7 +749,7 @@ static int compare_vbd_wsect(xenstat_domain *domain1, 
xenstat_domain *domain2)
 /* Prints number of total VBD WRITE sectors statistic */
 static void print_vbd_wsect(xenstat_domain *domain)
 {
-       print("%10llu", tot_vbd_reqs(domain, FIELD_VBD_WSECT));
+       print("%*llu", fields[FIELD_VBD_WSECT-1].default_width, 
tot_vbd_reqs(domain, FIELD_VBD_WSECT));
 }
 
 
@@ -806,6 +808,48 @@ static void print_ssid(xenstat_domain *domain)
        print("%4u", xenstat_domain_ssid(domain));
 }
 
+/* Resets default_width for fields with potentially large numbers */
+void reset_field_widths(void)
+{
+       fields[FIELD_NET_TX-1].default_width = 8;
+       fields[FIELD_NET_RX-1].default_width = 8;
+       fields[FIELD_VBD_RD-1].default_width = 8;
+       fields[FIELD_VBD_WR-1].default_width = 8;
+       fields[FIELD_VBD_RSECT-1].default_width = 10;
+       fields[FIELD_VBD_WSECT-1].default_width = 10;
+}
+
+/* Adjusts default_width for fields with potentially large numbers */
+void adjust_field_widths(xenstat_domain *domain)
+{
+       unsigned int length;
+
+       length = (unsigned int)(log10(tot_net_bytes(domain, FALSE)/1024) + 1);
+       if (length > fields[FIELD_NET_TX-1].default_width)
+               fields[FIELD_NET_TX-1].default_width = length;
+
+       length = (unsigned int)(log10(tot_net_bytes(domain, TRUE)/1024) + 1);
+       if (length > fields[FIELD_NET_RX-1].default_width)
+               fields[FIELD_NET_RX-1].default_width = length;
+
+       length = (unsigned int)(log10(tot_vbd_reqs(domain, FIELD_VBD_RD)) + 1);
+       if (length > fields[FIELD_VBD_RD-1].default_width)
+               fields[FIELD_VBD_RD-1].default_width = length;
+
+       length = (unsigned int)(log10(tot_vbd_reqs(domain, FIELD_VBD_WR)) + 1);
+       if (length > fields[FIELD_VBD_WR-1].default_width)
+               fields[FIELD_VBD_WR-1].default_width = length;
+
+       length = (unsigned int)(log10(tot_vbd_reqs(domain, FIELD_VBD_RSECT)) + 
1);
+       if (length > fields[FIELD_VBD_RSECT-1].default_width)
+               fields[FIELD_VBD_RSECT-1].default_width = length;
+
+       length = (unsigned int)(log10(tot_vbd_reqs(domain, FIELD_VBD_WSECT)) + 
1);
+       if (length > fields[FIELD_VBD_WSECT-1].default_width)
+               fields[FIELD_VBD_WSECT-1].default_width = length;
+}
+
+
 /* Section printing functions */
 /* Prints the top summary, above the domain table */
 void do_summary(void)
@@ -1088,6 +1132,12 @@ static void top(void)
        if(first_domain_index >= num_domains)
                first_domain_index = num_domains-1;
 
+       /* Adjust default_width for fields with potentially large numbers */
+       reset_field_widths();
+       for (i = first_domain_index; i < num_domains; i++) {
+               adjust_field_widths(domains[i]);
+       }
+
        for (i = first_domain_index; i < num_domains; i++) {
                if(!batch && current_row() == lines()-1)
                        break;


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