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ftrace: add tracing_cpumask 

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2008-05-12 21:20:52 +02:00 committed by Thomas Gleixner
parent 4ac3ba41d3
commit c7078de1aa
1 changed files with 70 additions and 8 deletions
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78
kernel/trace/trace.c
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@ -70,6 +70,23 @@ static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
unsigned long trace_flags = TRACE_ITER_PRINT_PARENT;
/*
* Only trace on a CPU if the bitmask is set:
*/
static cpumask_t tracing_cpumask __read_mostly = CPU_MASK_ALL;
/*
* The tracer itself will not take this lock, but still we want
* to provide a consistent cpumask to user-space:
*/
static DEFINE_MUTEX(tracing_cpumask_update_lock);
/*
* Temporary storage for the character representation of the
* CPU bitmask:
*/
static char mask_str[NR_CPUS];
void trace_wake_up(void)
{
/*
@ -1754,9 +1771,49 @@ static struct file_operations tracing_lt_fops = {
};
static struct file_operations show_traces_fops = {
.open = show_traces_open,
.read = seq_read,
.release = seq_release,
.open = show_traces_open,
.read = seq_read,
.release = seq_release,
};
static ssize_t
tracing_cpumask_read(struct file *filp, char __user *ubuf,
size_t count, loff_t *ppos)
{
int err;
count = min(count, (size_t)NR_CPUS);
mutex_lock(&tracing_cpumask_update_lock);
cpumask_scnprintf(mask_str, NR_CPUS, tracing_cpumask);
err = copy_to_user(ubuf, mask_str, count);
if (err)
count = -EFAULT;
mutex_unlock(&tracing_cpumask_update_lock);
return count;
}
static ssize_t
tracing_cpumask_write(struct file *filp, const char __user *ubuf,
size_t count, loff_t *ppos)
{
int err;
mutex_lock(&tracing_cpumask_update_lock);
err = cpumask_parse_user(ubuf, count, tracing_cpumask);
mutex_unlock(&tracing_cpumask_update_lock);
if (err)
return err;
return count;
}
static struct file_operations tracing_cpumask_fops = {
.open = tracing_open_generic,
.read = tracing_cpumask_read,
.write = tracing_cpumask_write,
};
static ssize_t
@ -1837,9 +1894,9 @@ tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf,
}
static struct file_operations tracing_iter_fops = {
.open = tracing_open_generic,
.read = tracing_iter_ctrl_read,
.write = tracing_iter_ctrl_write,
.open = tracing_open_generic,
.read = tracing_iter_ctrl_read,
.write = tracing_iter_ctrl_write,
};
static const char readme_msg[] =
@ -1870,8 +1927,8 @@ tracing_readme_read(struct file *filp, char __user *ubuf,
}
static struct file_operations tracing_readme_fops = {
.open = tracing_open_generic,
.read = tracing_readme_read,
.open = tracing_open_generic,
.read = tracing_readme_read,
};
static ssize_t
@ -2334,6 +2391,11 @@ static __init void tracer_init_debugfs(void)
if (!entry)
pr_warning("Could not create debugfs 'iter_ctrl' entry\n");
entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer,
NULL, &tracing_cpumask_fops);
if (!entry)
pr_warning("Could not create debugfs 'tracing_cpumask' entry\n");
entry = debugfs_create_file("latency_trace", 0444, d_tracer,
&global_trace, &tracing_lt_fops);
if (!entry)