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sched: latencytop support

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LatencyTOP kernel infrastructure; it measures latencies in the
scheduler and tracks it system wide and per process.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arjan van de Ven 2008-01-25 21:08:34 +01:00 • committed by Ingo Molnar
parent 326587b840
commit 9745512ce7
11 changed files with 429 additions and 1 deletions
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27
arch/x86/kernel/stacktrace.c
View file

@ -33,6 +33,19 @@ static void save_stack_address(void *data, unsigned long addr)
trace->entries[trace->nr_entries++] = addr;
}
static void save_stack_address_nosched(void *data, unsigned long addr)
{
struct stack_trace *trace = (struct stack_trace *)data;
if (in_sched_functions(addr))
return;
if (trace->skip > 0) {
trace->skip--;
return;
}
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = addr;
}
static const struct stacktrace_ops save_stack_ops = {
.warning = save_stack_warning,
.warning_symbol = save_stack_warning_symbol,
@ -40,6 +53,13 @@ static const struct stacktrace_ops save_stack_ops = {
.address = save_stack_address,
};
static const struct stacktrace_ops save_stack_ops_nosched = {
.warning = save_stack_warning,
.warning_symbol = save_stack_warning_symbol,
.stack = save_stack_stack,
.address = save_stack_address_nosched,
};
/*
* Save stack-backtrace addresses into a stack_trace buffer.
*/
@ -50,3 +70,10 @@ void save_stack_trace(struct stack_trace *trace)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
EXPORT_SYMBOL(save_stack_trace);
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
dump_trace(tsk, NULL, NULL, &save_stack_ops_nosched, trace);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}