[Xen-devel] [PATCH 6 of 8] xenalyze: Eliminate unnecessary cycles_to_time calculation

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

The time elements are only really accessed in dump mode, but they
cost a significant amount to calculate per record.  Only calculate
them if we're in dump mode.

Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

diff -r 4b3639bd3255 -r 108d02354403 xenalyze.c
--- a/xenalyze.c        Thu Jan 26 17:17:19 2012 +0000
+++ b/xenalyze.c        Thu Jan 26 17:17:53 2012 +0000
@@ -8601,9 +8601,6 @@ void process_record_tsc(tsc_t order_tsc,
 
         P.now = tsc;
     }
-    
-    /* Convert to s/ns once for convenience */
-    abs_cycles_to_time(ri->tsc, &ri->t);
 }
 
 /* Standardized part of dump output */
@@ -8615,6 +8612,8 @@ void create_dump_header(struct record_in
     len = DUMP_HEADER_MAX;
     c = ri->dump_header;
 
+    abs_cycles_to_time(ri->tsc, &ri->t);
+
     if ( ri->t.time )
     {
         r=snprintf(c, len, "%3u.%09u", ri->t.s, ri->t.ns);

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