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Calculate CPU usage per process in Linux implementation

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Added a utility function that stores old jiffles inside a hash table in
order to be able to provide usage values of system and user time in
percentage.
This commit is contained in:
Mike Massonnet
2010-05-05 16:30:37 +02:00
parent a02bf69573
commit 074f5039e1
1 changed files with 33 additions and 6 deletions
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39
src/task-manager-linux.c
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@@ -146,6 +146,35 @@ get_task_cmdline (Task *task)
}
}
static void
get_cpu_percent (guint pid, gulong jiffles_user, gfloat *cpu_user, gulong jiffles_system, gfloat *cpu_system)
{
static GHashTable *hash_cpu_user = NULL;
static GHashTable *hash_cpu_system = NULL;
gulong jiffles_user_old, jiffles_system_old;
if (hash_cpu_user == NULL)
{
hash_cpu_user = g_hash_table_new (NULL, NULL);
hash_cpu_system = g_hash_table_new (NULL, NULL);
}
jiffles_user_old = GPOINTER_TO_UINT (g_hash_table_lookup (hash_cpu_user, GUINT_TO_POINTER (pid)));
jiffles_system_old = GPOINTER_TO_UINT (g_hash_table_lookup (hash_cpu_system, GUINT_TO_POINTER (pid)));
g_hash_table_insert (hash_user, GUINT_TO_POINTER (pid), GUINT_TO_POINTER (jiffles_cpu_user));
g_hash_table_insert (hash_system, GUINT_TO_POINTER (pid), GUINT_TO_POINTER (jiffles_cpu_system));
if (_cpu_count > 0)
{
*cpu_user = (jiffles_user_old > 0) ? (jiffles_user - jiffles_user_old) / (gfloat)_cpu_count : 0;
*cpu_system = (jiffles_system_old > 0) ? (jiffles_system - jiffles_system_old) / (gfloat)_cpu_count : 0;
}
else
{
*cpu_user = *cpu_system = 0;
}
}
static gboolean
get_task_details (guint pid, Task *task)
{
@@ -163,8 +192,7 @@ get_task_details (guint pid, Task *task)
{
gchar dummy[255];
gint idummy;
static gulong cur_j_user, cur_j_system;
static gulong old_j_user, old_j_system;
gulong jiffles_user, jiffles_system;
struct passwd *pw;
struct stat sstat;
@@ -184,8 +212,8 @@ get_task_details (guint pid, Task *task)
dummy, // cminflt
dummy, // majflt
dummy, // cmajflt
&cur_j_user, // utime the number of jiffies that this process has scheduled in user mode
&cur_j_system, // stime " system mode
&jiffles_user, // utime the number of jiffies that this process has scheduled in user mode
&jiffles_system,// stime " system mode
&idummy, // cutime " waited for children in user mode
&idummy, // cstime " system mode
@@ -221,8 +249,7 @@ get_task_details (guint pid, Task *task)
);
task->rss *= get_pagesize ();
task->cpu_user = (old_j_user > 0 && _cpu_count > 0) ? (cur_j_user - old_j_user) / (gfloat)_cpu_count : 0;
task->cpu_system = (old_j_system > 0 && _cpu_count > 0) ? (cur_j_system - old_j_system) / (gfloat)_cpu_count : 0;
get_cpu_percent (task->pid, jiffles_user, &task->cpu_user, jiffles_system, &task->cpu_system);
stat (filename, &sstat);
pw = getpwuid (sstat.st_uid);