[PATCH] tools/xentop: fix cpu% sort order

[Leigh Brown <leigh@xxxxxxxxxxxxx>]

Although using integer comparison to compare doubles kind of
works, it's annoying to see domains slightly out of order when
sorting by cpu%.

Add a compare_dbl() function and update compare_cpu_pct() to
call it.

Signed-off-by: Leigh Brown <leigh@xxxxxxxxxxxxx>
---
 tools/xentop/xentop.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/tools/xentop/xentop.c b/tools/xentop/xentop.c
index 545bd5e96d..99199caec9 100644
--- a/tools/xentop/xentop.c
+++ b/tools/xentop/xentop.c
@@ -85,6 +85,7 @@ static void set_delay(const char *value);
 static void set_prompt(const char *new_prompt, void (*func)(const char *));
 static int handle_key(int);
 static int compare(unsigned long long, unsigned long long);
+static int compare_dbl(double, double);
 static int compare_domains(xenstat_domain **, xenstat_domain **);
 static unsigned long long tot_net_bytes( xenstat_domain *, int);
 static bool tot_vbd_reqs(xenstat_domain *, int, unsigned long long *);
@@ -422,6 +423,16 @@ static int compare(unsigned long long i1, unsigned long 
long i2)
        return 0;
 }
 
+/* Compares two double precision numbers, returning -1,0,1 for <,=,> */
+static int compare_dbl(double d1, double d2)
+{
+       if(d1 < d2)
+               return -1;
+       if(d1 > d2)
+               return 1;
+       return 0;
+}
+
 /* Comparison function for use with qsort.  Compares two domains using the
  * current sort field. */
 static int compare_domains(xenstat_domain **domain1, xenstat_domain **domain2)
@@ -523,7 +534,7 @@ static double get_cpu_pct(xenstat_domain *domain)
 
 static int compare_cpu_pct(xenstat_domain *domain1, xenstat_domain *domain2)
 {
-       return -compare(get_cpu_pct(domain1), get_cpu_pct(domain2));
+       return -compare_dbl(get_cpu_pct(domain1), get_cpu_pct(domain2));
 }
 
 /* Prints cpu percentage statistic */
-- 
2.39.2