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tracing: add tracer dependent options to options directory

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This patch adds the tracer dependent options dynamically to the
options directory when the tracer is activated. These options are
removed when the tracer is deactivated.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt 2009-02-26 23:43:05 -05:00
parent a825907507
commit 577b785f55
1 changed files with 173 additions and 1 deletions
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174
kernel/trace/trace.c
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@ -2275,8 +2275,17 @@ int tracer_init(struct tracer *t, struct trace_array *tr)
return t->init(tr);
}
struct trace_option_dentry;
static struct trace_option_dentry *
create_trace_option_files(struct tracer *tracer);
static void
destroy_trace_option_files(struct trace_option_dentry *topts);
static int tracing_set_tracer(const char *buf)
{
static struct trace_option_dentry *topts;
struct trace_array *tr = &global_trace;
struct tracer *t;
int ret = 0;
@ -2297,7 +2306,12 @@ static int tracing_set_tracer(const char *buf)
if (current_trace && current_trace->reset)
current_trace->reset(tr);
destroy_trace_option_files(topts);
current_trace = t;
topts = create_trace_option_files(current_trace);
if (t->init) {
ret = tracer_init(t, tr);
if (ret)
@ -3093,6 +3107,95 @@ static void tracing_init_debugfs_percpu(long cpu)
#include "trace_selftest.c"
#endif
struct trace_option_dentry {
struct tracer_opt *opt;
struct tracer_flags *flags;
struct dentry *entry;
};
static ssize_t
trace_options_read(struct file *filp, char __user *ubuf, size_t cnt,
loff_t *ppos)
{
struct trace_option_dentry *topt = filp->private_data;
char *buf;
if (topt->flags->val & topt->opt->bit)
buf = "1\n";
else
buf = "0\n";
return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
}
static ssize_t
trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt,
loff_t *ppos)
{
struct trace_option_dentry *topt = filp->private_data;
unsigned long val;
char buf[64];
int ret;
if (cnt >= sizeof(buf))
return -EINVAL;
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
buf[cnt] = 0;
ret = strict_strtoul(buf, 10, &val);
if (ret < 0)
return ret;
ret = 0;
switch (val) {
case 0:
/* do nothing if already cleared */
if (!(topt->flags->val & topt->opt->bit))
break;
mutex_lock(&trace_types_lock);
if (current_trace->set_flag)
ret = current_trace->set_flag(topt->flags->val,
topt->opt->bit, 0);
mutex_unlock(&trace_types_lock);
if (ret)
return ret;
topt->flags->val &= ~topt->opt->bit;
break;
case 1:
/* do nothing if already set */
if (topt->flags->val & topt->opt->bit)
break;
mutex_lock(&trace_types_lock);
if (current_trace->set_flag)
ret = current_trace->set_flag(topt->flags->val,
topt->opt->bit, 1);
mutex_unlock(&trace_types_lock);
if (ret)
return ret;
topt->flags->val |= topt->opt->bit;
break;
default:
return -EINVAL;
}
*ppos += cnt;
return cnt;
}
static const struct file_operations trace_options_fops = {
.open = tracing_open_generic,
.read = trace_options_read,
.write = trace_options_write,
};
static ssize_t
trace_options_core_read(struct file *filp, char __user *ubuf, size_t cnt,
loff_t *ppos)
@ -3146,7 +3249,6 @@ trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt,
return cnt;
}
static const struct file_operations trace_options_core_fops = {
.open = tracing_open_generic,
.read = trace_options_core_read,
@ -3174,6 +3276,76 @@ static struct dentry *trace_options_init_dentry(void)
return t_options;
}
static void
create_trace_option_file(struct trace_option_dentry *topt,
struct tracer_flags *flags,
struct tracer_opt *opt)
{
struct dentry *t_options;
struct dentry *entry;
t_options = trace_options_init_dentry();
if (!t_options)
return;
topt->flags = flags;
topt->opt = opt;
entry = debugfs_create_file(opt->name, 0644, t_options, topt,
&trace_options_fops);
topt->entry = entry;
}
static struct trace_option_dentry *
create_trace_option_files(struct tracer *tracer)
{
struct trace_option_dentry *topts;
struct tracer_flags *flags;
struct tracer_opt *opts;
int cnt;
if (!tracer)
return NULL;
flags = tracer->flags;
if (!flags || !flags->opts)
return NULL;
opts = flags->opts;
for (cnt = 0; opts[cnt].name; cnt++)
;
topts = kzalloc(sizeof(*topts) * (cnt + 1), GFP_KERNEL);
if (!topts)
return NULL;
for (cnt = 0; opts[cnt].name; cnt++)
create_trace_option_file(&topts[cnt], flags,
&opts[cnt]);
return topts;
}
static void
destroy_trace_option_files(struct trace_option_dentry *topts)
{
int cnt;
if (!topts)
return;
for (cnt = 0; topts[cnt].opt; cnt++) {
if (topts[cnt].entry)
debugfs_remove(topts[cnt].entry);
}
kfree(topts);
}
static struct dentry *
create_trace_option_core_file(const char *option, long index)
{