2 files changed, 24 insertions, 12 deletions

diff --git a/tools/perf/util/svghelper.c b/tools/perf/util/svghelper.c
index 52f628fe6421..be1555e241b2 100644
--- a/tools/perf/util/svghelper.c
+++ b/tools/perf/util/svghelper.c
@@ -25,7 +25,8 @@ static u64 turbo_frequency, max_freq;
 
 #define SLOT_MULT 30.0
 #define SLOT_HEIGHT 25.0
-#define WIDTH 1000.0
+
+int svg_page_width = 1000;
 
 #define MIN_TEXT_SIZE 0.001
 
@@ -46,21 +47,35 @@ static double time2pixels(u64 time)
 {
         double X;
 
-        X = WIDTH * (time - first_time) / (last_time - first_time);
+        X = 1.0 * svg_page_width * (time - first_time) / (last_time - first_time);
         return X;
 }
 
-void open_svg(const char *filename, int cpus, int rows)
+void open_svg(const char *filename, int cpus, int rows, u64 start, u64 end)
 {
+        int new_width;
 
         svgfile = fopen(filename, "w");
         if (!svgfile) {
                 fprintf(stderr, "Cannot open %s for output\n", filename);
                 return;
         }
+        first_time = start;
+        first_time = first_time / 100000000 * 100000000;
+        last_time = end;
+
+        /*
+         * if the recording is short, we default to a width of 1000, but
+         * for longer recordings we want at least 200 units of width per second
+         */
+        new_width = (last_time - first_time) / 5000000;
+
+        if (new_width > svg_page_width)
+                svg_page_width = new_width;
+
         total_height = (1 + rows + cpu2slot(cpus)) * SLOT_MULT;
         fprintf(svgfile, "<?xml version=\"1.0\" standalone=\"no\"?> \n");
-        fprintf(svgfile, "<svg width=\"%4.1f\" height=\"%llu\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n", WIDTH, total_height);
+        fprintf(svgfile, "<svg width=\"%i\" height=\"%llu\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n", svg_page_width, total_height);
 
         fprintf(svgfile, "<defs>\n  <style type=\"text/css\">\n    <![CDATA[\n");
 
@@ -404,15 +419,10 @@ void svg_legenda(void)
         svg_legenda_box(800,    "Blocked on IO", "blocked");
 }
 
-void svg_time_grid(u64 start, u64 end)
+void svg_time_grid(void)
 {
         u64 i;
 
-        first_time = start;
-        last_time = end;
-
-        first_time = first_time / 100000000 * 100000000;
-
         if (!svgfile)
                 return;
 
diff --git a/tools/perf/util/svghelper.h b/tools/perf/util/svghelper.h
index ed4ebcfaf493..cd93195aedb3 100644
--- a/tools/perf/util/svghelper.h
+++ b/tools/perf/util/svghelper.h
@@ -3,7 +3,7 @@
 
 #include "types.h"
 
-extern void open_svg(const char *filename, int cpus, int rows);
+extern void open_svg(const char *filename, int cpus, int rows, u64 start, u64 end);
 extern void svg_box(int Yslot, u64 start, u64 end, const char *type);
 extern void svg_sample(int Yslot, int cpu, u64 start, u64 end);
 extern void svg_waiting(int Yslot, u64 start, u64 end);
@@ -15,7 +15,7 @@ extern void svg_cstate(int cpu, u64 start, u64 end, int type);
 extern void svg_pstate(int cpu, u64 start, u64 end, u64 freq);
 
 
-extern void svg_time_grid(u64 start, u64 end);
+extern void svg_time_grid(void);
 extern void svg_legenda(void);
 extern void svg_wakeline(u64 start, int row1, int row2);
 extern void svg_partial_wakeline(u64 start, int row1, char *desc1, int row2, char *desc2);
@@ -23,4 +23,6 @@ extern void svg_interrupt(u64 start, int row);
 extern void svg_text(int Yslot, u64 start, const char *text);
 extern void svg_close(void);
 
+extern int svg_page_width;
+
 #endif