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Changed the way how CPU activity is monitored: instead of taking the active

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time of the idle thread as a measure, we now compute the CPU activity on
each thread switch - the time the CPU worked is the total of user and kernel
time a thread spent during its quantum.
Unlike before, this mechanism works correctly on SMP machines. I hope this
works as expected :)


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16193 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler
2006-02-01 20:03:55 +00:00
parent a5fa64b505
commit d14aab0dca
7 changed files with 63 additions and 41 deletions
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src/system/kernel/thread.c
+1 -28
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@@ -1281,34 +1281,6 @@ spawn_kernel_thread_etc(thread_func function, const char *name, int32 priority,
}
bigtime_t
thread_get_active_cpu_time(int32 cpuNum)
{
bigtime_t activeTime;
cpu_status state;
if (cpuNum < 0 || cpuNum > B_MAX_CPU_COUNT || sIdleThreads[cpuNum] == NULL)
return 0;
activeTime = system_time();
// we need to grab the thread lock here, because the thread activity
// time is not maintained atomically (because there is no need to)
state = disable_interrupts();
GRAB_THREAD_LOCK();
// TODO: this is wrong - the idle threads are arbitrarly executed by the CPUs
// there is no CPU affinity!
activeTime -= sIdleThreads[cpuNum]->kernel_time;
RELEASE_THREAD_LOCK();
restore_interrupts(state);
return activeTime;
}
int32
thread_max_threads(void)
{
@@ -1371,6 +1343,7 @@ thread_init(kernel_args *args)
thread->next_state = B_THREAD_READY;
sprintf(name, "idle thread %lu kstack", i + 1);
thread->kernel_stack_area = find_area(name);
thread->entry = NULL;
if (get_area_info(thread->kernel_stack_area, &info) != B_OK)
panic("error finding idle kstack area\n");