varun-r-mallya/sysprof
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Improve 2.6 port

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Søren Sandmann Pedersen
2004-09-06 20:29:03 +00:00
parent 1e0ed9e3ac
commit aacf216239
1 changed files with 46 additions and 14 deletions
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60
sysprof-module.c
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@ -20,7 +20,7 @@
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Soeren Sandmann (sandmann@daimi.au.dk)");
#define SAMPLES_PER_SECOND (50)
#define SAMPLES_PER_SECOND (100)
#define INTERVAL (HZ / SAMPLES_PER_SECOND)
#define N_TRACES 256
@ -90,7 +90,7 @@ add_timeout(unsigned int interval,
*/
static void
generate_stack_trace(struct pt_regs *regs,
generate_stack_trace(struct task_struct *task,
SysprofStackTrace *trace)
{
#define START_OF_STACK 0xBFFFFFFF
@ -104,9 +104,10 @@ generate_stack_trace(struct pt_regs *regs,
StackFrame *frame;
int i;
struct pt_regs *regs = ((struct pt_regs *) (THREAD_SIZE + (unsigned long) task->thread_info)) - 1;
memset(trace, 0, sizeof (SysprofStackTrace));
trace->pid = current->pid;
trace->pid = task->pid;
trace->truncated = 0;
trace->addresses[0] = (void *)regs->eip;
@ -139,6 +140,44 @@ generate_stack_trace(struct pt_regs *regs,
trace->truncated = 0;
}
struct work_struct work;
static int in_queue;
static void
do_generate (void *data)
{
struct task_struct *task = data;
struct task_struct *p;
in_queue = 0;
/* Make sure the task still exists */
for_each_process (p)
if (p == task)
goto go_ahead;
go_ahead:
generate_stack_trace (task, head);
if (head++ == &stack_traces[N_TRACES - 1])
head = &stack_traces[0];
wake_up (&wait_for_trace);
}
static void
queue_stack (struct task_struct *cur)
{
if (in_queue)
return;
in_queue = 1;
INIT_WORK (&work, do_generate, cur);
schedule_work (&work);
}
static void
on_timer(unsigned long dong)
{
@ -162,19 +201,12 @@ on_timer(unsigned long dong)
#endif
)
{
#ifdef KERNEL24
struct pt_regs *regs = (struct pt_regs *)(
(long)current + THREAD_SIZE - sizeof (struct pt_regs));
#else
struct pt_regs *regs = ((struct pt_regs *) (THREAD_SIZE + (unsigned long) current->thread_info)) - 1;
struct pt_regs *regs = (struct pt_regs *)(
(long)current + THREAD_SIZE - sizeof (struct pt_regs));
#endif
generate_stack_trace (regs, head);
if (head++ == &stack_traces[N_TRACES - 1])
head = &stack_traces[0];
wake_up (&wait_for_trace);
queue_stack (current);
}
add_timeout (INTERVAL, on_timer);