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This commit is contained in:
Søren Sandmann Pedersen
2004-11-02 14:48:19 +00:00
parent 9140810664
commit 786bef0abb
1 changed files with 23 additions and 7 deletions
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30
sysprof-module.c
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@ -18,6 +18,7 @@
#include "sysprof-module.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Soeren Sandmann (sandmann@daimi.au.dk)");
@ -42,8 +43,9 @@ static struct timer_list timer;
static void
init_timeout (void)
{
init_timer(&timer);
printk (KERN_ALERT "init timeout\n");
timer.function = on_timer;
init_timer(&timer);
}
static void
@ -88,6 +90,9 @@ read_user_space (userspace_reader *reader,
if (user_page == 0)
return 0;
printk (KERN_ALERT "locking\n");
spin_lock(&reader->task->mm->page_table_lock);
if (!reader->user_page || user_page != reader->user_page) {
int found;
@ -102,12 +107,19 @@ read_user_space (userspace_reader *reader,
1, 0, 0, &page, NULL);
if (!found)
{
printk (KERN_ALERT "unlocking\n");
spin_unlock(&reader->task->mm->page_table_lock);
return 0;
}
reader->kernel_page = (unsigned long)kmap (page);
reader->page = page;
}
printk (KERN_ALERT "unlocking\n");
spin_unlock(&reader->task->mm->page_table_lock);
if (get_user (res, (int *)(reader->kernel_page + (address - user_page))) != 0)
return 0;
@ -198,15 +210,18 @@ do_generate (void *data)
struct task_struct *p;
in_queue = 0;
printk (KERN_ALERT "do_generate\n");
/* Make sure the task still exists */
for_each_process (p)
if (p == task)
goto go_ahead;
return;
go_ahead:
generate_stack_trace(task, head);
printk (KERN_ALERT "generated stack\n");
if (head++ == &stack_traces[N_TRACES - 1])
head = &stack_traces[0];
@ -214,7 +229,7 @@ do_generate (void *data)
}
static void
queue_stack (struct task_struct *cur)
queue_generate_stack_trace (struct task_struct *cur)
{
if (in_queue)
return;
@ -230,13 +245,14 @@ static void
on_timer(unsigned long dong)
{
static int n_ticks = 0;
task_t *task = current;
++n_ticks;
if (current && current->pid != 0)
{
queue_stack (current);
}
printk (KERN_ALERT "on timer\n");
if (task && task->pid != 0)
queue_generate_stack_trace (task);
add_timeout (INTERVAL, on_timer);
}