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

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

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

If the -f option is used to allow full length VM names, those names will
also be aligned based on the longest name in the NAME column.

The default minimum width of all columns remains unchanged.

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

diff --git a/tools/xenstat/xentop/Makefile b/tools/xenstat/xentop/Makefile
index 18bccb6..076e44c 100644
--- a/tools/xenstat/xentop/Makefile
+++ b/tools/xenstat/xentop/Makefile
@@ -19,7 +19,7 @@ all install xentop:
 else
 
 CFLAGS += -DGCC_PRINTF -Werror $(CFLAGS_libxenstat)
-LDLIBS += $(LDLIBS_libxenstat) $(CURSES_LIBS) $(SOCKET_LIBS)
+LDLIBS += $(LDLIBS_libxenstat) $(CURSES_LIBS) $(SOCKET_LIBS) -lm
 CFLAGS += -DHOST_$(XEN_OS)
 
 # Include configure output (config.h) to headers search path
diff --git a/tools/xenstat/xentop/xentop.c b/tools/xenstat/xentop/xentop.c
index dd11927..3062cb5 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>
@@ -70,6 +71,8 @@
 #define curses_str_t const char *
 #endif
 
+#define INT_FIELD_WIDTH(n) ((unsigned int)(log10(n) + 1))
+
 /*
  * Function prototypes
  */
@@ -127,7 +130,8 @@ 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);
@@ -444,7 +448,7 @@ int compare_name(xenstat_domain *domain1, xenstat_domain 
*domain2)
 void print_name(xenstat_domain *domain)
 {
        if(show_full_name)
-               print("%10s", xenstat_domain_name(domain));
+               print("%*s", fields[FIELD_NAME-1].default_width, 
xenstat_domain_name(domain));
        else
                print("%10.10s", xenstat_domain_name(domain));
 }
@@ -623,7 +627,7 @@ 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 +641,7 @@ 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 +709,7 @@ 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 +723,7 @@ 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 +737,7 @@ 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 +751,7 @@ 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 +810,54 @@ 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;
+
+       if (show_full_name) {
+               length = strlen(xenstat_domain_name(domain));
+               if (length > fields[FIELD_NAME-1].default_width)
+                       fields[FIELD_NAME-1].default_width = length;
+       }
+
+       length = INT_FIELD_WIDTH((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 = INT_FIELD_WIDTH((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 = INT_FIELD_WIDTH((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 = INT_FIELD_WIDTH((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 = INT_FIELD_WIDTH((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 = INT_FIELD_WIDTH((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 +1140,12 @@ 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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