提交 d244b6bd 编写于 作者: S Steven Rostedt 提交者: Steven Rostedt

Merge branch 'tip/perf/urgent-3' of...

Merge branch 'tip/perf/urgent-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into trace/tip/perf/urgent-4

Conflicts:
	kernel/trace/trace_events.c
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
......@@ -3846,6 +3846,9 @@ int ring_buffer_read_page(struct ring_buffer *buffer,
rpos = reader->read;
pos += size;
if (rpos >= commit)
break;
event = rb_reader_event(cpu_buffer);
size = rb_event_length(event);
} while (len > size);
......
......@@ -3463,6 +3463,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *fpos)
{
char *buf;
size_t written;
if (tracing_disabled)
return -EINVAL;
......@@ -3484,11 +3485,15 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
} else
buf[cnt] = '\0';
cnt = mark_printk("%s", buf);
written = mark_printk("%s", buf);
kfree(buf);
*fpos += cnt;
*fpos += written;
return cnt;
/* don't tell userspace we wrote more - it might confuse them */
if (written > cnt)
written = cnt;
return written;
}
static int tracing_clock_show(struct seq_file *m, void *v)
......
......@@ -598,88 +598,165 @@ system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
return ret;
}
static void print_event_fields(struct trace_seq *s, struct list_head *head)
enum {
FORMAT_HEADER = 1,
FORMAT_PRINTFMT = 2,
};
static void *f_next(struct seq_file *m, void *v, loff_t *pos)
{
struct ftrace_event_call *call = m->private;
struct ftrace_event_field *field;
struct list_head *head;
list_for_each_entry_reverse(field, head, link) {
/*
* Smartly shows the array type(except dynamic array).
* Normal:
* field:TYPE VAR
* If TYPE := TYPE[LEN], it is shown:
* field:TYPE VAR[LEN]
*/
const char *array_descriptor = strchr(field->type, '[');
(*pos)++;
if (!strncmp(field->type, "__data_loc", 10))
array_descriptor = NULL;
switch ((unsigned long)v) {
case FORMAT_HEADER:
head = &ftrace_common_fields;
if (!array_descriptor) {
trace_seq_printf(s, "\tfield:%s %s;\toffset:%u;"
"\tsize:%u;\tsigned:%d;\n",
field->type, field->name, field->offset,
field->size, !!field->is_signed);
} else {
trace_seq_printf(s, "\tfield:%.*s %s%s;\toffset:%u;"
"\tsize:%u;\tsigned:%d;\n",
(int)(array_descriptor - field->type),
field->type, field->name,
array_descriptor, field->offset,
field->size, !!field->is_signed);
}
if (unlikely(list_empty(head)))
return NULL;
field = list_entry(head->prev, struct ftrace_event_field, link);
return field;
case FORMAT_PRINTFMT:
/* all done */
return NULL;
}
head = trace_get_fields(call);
/*
* To separate common fields from event fields, the
* LSB is set on the first event field. Clear it in case.
*/
v = (void *)((unsigned long)v & ~1L);
field = v;
/*
* If this is a common field, and at the end of the list, then
* continue with main list.
*/
if (field->link.prev == &ftrace_common_fields) {
if (unlikely(list_empty(head)))
return NULL;
field = list_entry(head->prev, struct ftrace_event_field, link);
/* Set the LSB to notify f_show to print an extra newline */
field = (struct ftrace_event_field *)
((unsigned long)field | 1);
return field;
}
/* If we are done tell f_show to print the format */
if (field->link.prev == head)
return (void *)FORMAT_PRINTFMT;
field = list_entry(field->link.prev, struct ftrace_event_field, link);
return field;
}
static ssize_t
event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
loff_t *ppos)
static void *f_start(struct seq_file *m, loff_t *pos)
{
struct ftrace_event_call *call = filp->private_data;
struct list_head *head;
struct trace_seq *s;
char *buf;
int r;
loff_t l = 0;
void *p;
if (*ppos)
/* Start by showing the header */
if (!*pos)
return (void *)FORMAT_HEADER;
p = (void *)FORMAT_HEADER;
do {
p = f_next(m, p, &l);
} while (p && l < *pos);
return p;
}
static int f_show(struct seq_file *m, void *v)
{
struct ftrace_event_call *call = m->private;
struct ftrace_event_field *field;
const char *array_descriptor;
switch ((unsigned long)v) {
case FORMAT_HEADER:
seq_printf(m, "name: %s\n", call->name);
seq_printf(m, "ID: %d\n", call->event.type);
seq_printf(m, "format:\n");
return 0;
s = kmalloc(sizeof(*s), GFP_KERNEL);
if (!s)
return -ENOMEM;
case FORMAT_PRINTFMT:
seq_printf(m, "\nprint fmt: %s\n",
call->print_fmt);
return 0;
}
trace_seq_init(s);
/*
* To separate common fields from event fields, the
* LSB is set on the first event field. Clear it and
* print a newline if it is set.
*/
if ((unsigned long)v & 1) {
seq_putc(m, '\n');
v = (void *)((unsigned long)v & ~1L);
}
trace_seq_printf(s, "name: %s\n", call->name);
trace_seq_printf(s, "ID: %d\n", call->event.type);
trace_seq_printf(s, "format:\n");
field = v;
/* print common fields */
print_event_fields(s, &ftrace_common_fields);
/*
* Smartly shows the array type(except dynamic array).
* Normal:
* field:TYPE VAR
* If TYPE := TYPE[LEN], it is shown:
* field:TYPE VAR[LEN]
*/
array_descriptor = strchr(field->type, '[');
trace_seq_putc(s, '\n');
if (!strncmp(field->type, "__data_loc", 10))
array_descriptor = NULL;
/* print event specific fields */
head = trace_get_fields(call);
print_event_fields(s, head);
if (!array_descriptor)
seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
field->type, field->name, field->offset,
field->size, !!field->is_signed);
else
seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
(int)(array_descriptor - field->type),
field->type, field->name,
array_descriptor, field->offset,
field->size, !!field->is_signed);
r = trace_seq_printf(s, "\nprint fmt: %s\n", call->print_fmt);
return 0;
}
if (!r) {
/*
* ug! The format output is bigger than a PAGE!!
*/
buf = "FORMAT TOO BIG\n";
r = simple_read_from_buffer(ubuf, cnt, ppos,
buf, strlen(buf));
goto out;
}
static void f_stop(struct seq_file *m, void *p)
{
}
r = simple_read_from_buffer(ubuf, cnt, ppos,
s->buffer, s->len);
out:
kfree(s);
return r;
static const struct seq_operations trace_format_seq_ops = {
.start = f_start,
.next = f_next,
.stop = f_stop,
.show = f_show,
};
static int trace_format_open(struct inode *inode, struct file *file)
{
struct ftrace_event_call *call = inode->i_private;
struct seq_file *m;
int ret;
ret = seq_open(file, &trace_format_seq_ops);
if (ret < 0)
return ret;
m = file->private_data;
m->private = call;
return 0;
}
static ssize_t
......@@ -877,8 +954,10 @@ static const struct file_operations ftrace_enable_fops = {
};
static const struct file_operations ftrace_event_format_fops = {
.open = tracing_open_generic,
.read = event_format_read,
.open = trace_format_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static const struct file_operations ftrace_event_id_fops = {
......
......@@ -507,7 +507,15 @@ get_return_for_leaf(struct trace_iterator *iter,
* if the output fails.
*/
data->ent = *curr;
data->ret = *next;
/*
* If the next event is not a return type, then
* we only care about what type it is. Otherwise we can
* safely copy the entire event.
*/
if (next->ent.type == TRACE_GRAPH_RET)
data->ret = *next;
else
data->ret.ent.type = next->ent.type;
}
}
......
......@@ -159,6 +159,7 @@ my $section_regex; # Find the start of a section
my $function_regex; # Find the name of a function
# (return offset and func name)
my $mcount_regex; # Find the call site to mcount (return offset)
my $mcount_adjust; # Address adjustment to mcount offset
my $alignment; # The .align value to use for $mcount_section
my $section_type; # Section header plus possible alignment command
my $can_use_local = 0; # If we can use local function references
......@@ -213,6 +214,7 @@ $section_regex = "Disassembly of section\\s+(\\S+):";
$function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:";
$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$";
$section_type = '@progbits';
$mcount_adjust = 0;
$type = ".long";
if ($arch eq "x86_64") {
......@@ -351,6 +353,9 @@ if ($arch eq "x86_64") {
} elsif ($arch eq "microblaze") {
# Microblaze calls '_mcount' instead of plain 'mcount'.
$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$";
} elsif ($arch eq "blackfin") {
$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s__mcount\$";
$mcount_adjust = -4;
} else {
die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD";
}
......@@ -511,7 +516,7 @@ while (<IN>) {
}
# is this a call site to mcount? If so, record it to print later
if ($text_found && /$mcount_regex/) {
push(@offsets, hex $1);
push(@offsets, (hex $1) + $mcount_adjust);
}
}
......
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