Words by Matt Mackall [Fri, May 11, 2007 at 09:39:05PM -0500]:
quoted text
> On Sat, May 12, 2007 at 02:40:52AM +0100, Jose Celestino wrote:
> > Words by Matt Mackall [Fri, May 11, 2007 at 07:17:19PM -0500]:
> > > On Fri, May 11, 2007 at 04:07:18PM -0700, Arjan van de Ven wrote:
> > > > 
> > > > What's eating the battery life of my laptop? Why isn't it many more 
> > > > hours? Which software component causes the most power to be burned? 
> > > > These are important questions without a good answer... until now.
> > > 
> > > I get:
> > > 
> > > No detailed statistics available; please enable the CONFIG_TIMER_STATS
> > > kernel option
> > > 
> > 
> > Must run as root (rw to /proc/timer_stats is needed).
> 
> That file doesn't exist, despite CONFIG_TIMER_STATS being in
> /proc/config.gz.
> 

Then again, perhaps you have /proc/tstats instead.

If so apply this (well, you get the idea):

--- powertop/powertop.c 2007-05-12 05:01:15.000000000 +0100
+++ powertop_new/powertop.c     2007-05-12 05:08:46.000000000 +0100
@@ -212,8 +212,8 @@
 void stop_timerstats(void)
 {
        FILE *file;
-       file = fopen("/proc/timer_stats","w");
-       if (!file) {
+       if (!(file = fopen("/proc/timer_stats","w")) &&
+               !(file = fopen("/proc/stats","w")) ) {
                nostats = 1;
                return;
        }
@@ -223,8 +223,8 @@
 void start_timerstats(void)
 {
        FILE *file;
-       file = fopen("/proc/timer_stats","w");
-       if (!file) {
+       if (!(file = fopen("/proc/timer_stats","w")) &&
+               !(file = fopen("/proc/stats","w")) ) {
                nostats = 1;
                return;
        }
@@ -388,7 +388,7 @@
                i = 0;
                totalticks = 0;
                if (!nostats)
-                       file = popen("cat /proc/timer_stats | sort -n | tail -190", "r");
+                       file = popen("cat /proc/timer_stats 2>>/dev/null|| cat /proc/tstats | sort -n | tail -190", "r");
                while (file && !feof(file) && i<190) {
                        char *count, *pid, *process, *func;
                        int cnt;


-- 
Jose Celestino
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