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[linux|solaris] Fix regression introduced with the “Refresh rate” option

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The CPU usage computation done for the processes were broken when the
refresh rate was different than a second. The introduced fix is only
necessary for the Linux and OpenSolaris implementations.
This commit is contained in:
Mike Massonnet
2010-05-24 19:08:57 +02:00
parent 7617d17b04
commit f929d83f37
2 changed files with 34 additions and 24 deletions
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34
src/task-manager-linux.c
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@@ -20,6 +20,7 @@
#include "task-manager.h"
static gushort _cpu_count = 0;
static gulong jiffies_total_delta = 0;
gboolean
get_memory_usage (guint64 *memory_total, guint64 *memory_free, guint64 *memory_cache, guint64 *memory_buffers, guint64 *swap_total, guint64 *swap_free)
@@ -59,9 +60,8 @@ get_cpu_usage (gushort *cpu_count, gfloat *cpu_user, gfloat *cpu_system)
FILE *file;
gchar *filename = "/proc/stat";
gchar buffer[1024];
static gulong cur_jiffies_user = 0, old_jiffies_user = 0;
static gulong cur_jiffies_system = 0, old_jiffies_system = 0;
static gulong cur_jiffies = 0, old_jiffies = 0;
static gulong jiffies_user = 0, jiffies_system = 0, jiffies_total = 0;
static gulong jiffies_user_old = 0, jiffies_system_old = 0, jiffies_total_old = 0;
gulong user, user_nice, system, idle;
if ((file = fopen (filename, "r")) == NULL)
@@ -72,7 +72,6 @@ get_cpu_usage (gushort *cpu_count, gfloat *cpu_user, gfloat *cpu_system)
if (_cpu_count == 0)
{
_cpu_count = 0;
while (fgets (buffer, 1024, file) != NULL)
{
if (buffer[0] != 'c' && buffer[1] != 'p' && buffer[2] != 'u')
@@ -80,24 +79,25 @@ get_cpu_usage (gushort *cpu_count, gfloat *cpu_user, gfloat *cpu_system)
_cpu_count += 1;
}
if (_cpu_count == 0)
_cpu_count += 1;
_cpu_count = 1;
}
fclose (file);
old_jiffies_user = cur_jiffies_user;
old_jiffies_system = cur_jiffies_system;
old_jiffies = cur_jiffies;
jiffies_user_old = jiffies_user;
jiffies_system_old = jiffies_system;
jiffies_total_old = jiffies_total;
cur_jiffies_user = user + user_nice;
cur_jiffies_system = system;
cur_jiffies = cur_jiffies_user + cur_jiffies_system + idle;
jiffies_user = user + user_nice;
jiffies_system = system;
jiffies_total = jiffies_user + jiffies_system + idle;
*cpu_user = *cpu_system = 0.0;
if (cur_jiffies > old_jiffies)
if (jiffies_total > jiffies_total_old)
{
*cpu_user = (cur_jiffies_user - old_jiffies_user) * 100 / (gdouble)(cur_jiffies - old_jiffies);
*cpu_system = (cur_jiffies_system - old_jiffies_system) * 100 / (gdouble)(cur_jiffies - old_jiffies);
jiffies_total_delta = jiffies_total - jiffies_total_old;
*cpu_user = (jiffies_user - jiffies_user_old) * 100 / (gdouble)(jiffies_total_delta);
*cpu_system = (jiffies_system - jiffies_system_old) * 100 / (gdouble)(jiffies_total_delta);
}
*cpu_count = _cpu_count;
@@ -170,10 +170,10 @@ get_cpu_percent (guint pid, gulong jiffies_user, gfloat *cpu_user, gulong jiffie
if (jiffies_user < jiffies_user_old || jiffies_system < jiffies_system_old)
return;
if (_cpu_count > 0)
if (_cpu_count > 0 && jiffies_total_delta > 0)
{
*cpu_user = (jiffies_user_old > 0) ? (jiffies_user - jiffies_user_old) / (gfloat)_cpu_count : 0;
*cpu_system = (jiffies_system_old > 0) ? (jiffies_system - jiffies_system_old) / (gfloat)_cpu_count : 0;
*cpu_user = (jiffies_user - jiffies_user_old) * 100 / (gdouble)jiffies_total_delta;
*cpu_system = (jiffies_system - jiffies_system_old) * 100 / (gdouble)jiffies_total_delta;
}
else
{