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tracing: Remove lock_depth from event entry

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The lock_depth field in the event headers was added as a temporary
data point for help in removing the BKL. Now that the BKL is pretty
much been removed, we can remove this field.

This in turn changes the header from 12 bytes to 8 bytes,
removing the 4 byte buffer that gcc would insert if the first field
in the data load was 8 bytes in size.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2011-03-09 10:41:56 -05:00 committed by Steven Rostedt
parent de29be5e71
commit e6e1e25935
4 changed files with 5 additions and 15 deletions
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1
include/linux/ftrace_event.h
View file

@ -37,7 +37,6 @@ struct trace_entry {
unsigned char flags;
unsigned char preempt_count;
int pid;
int lock_depth;
};
#define FTRACE_MAX_EVENT \

8
kernel/trace/trace.c
View file

@ -1101,7 +1101,6 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
entry->preempt_count = pc & 0xff;
entry->pid = (tsk) ? tsk->pid : 0;
entry->lock_depth = (tsk) ? tsk->lock_depth : 0;
entry->flags =
#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
(irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) |
@ -1748,10 +1747,9 @@ static void print_lat_help_header(struct seq_file *m)
seq_puts(m, "# | / _----=> need-resched \n");
seq_puts(m, "# || / _---=> hardirq/softirq \n");
seq_puts(m, "# ||| / _--=> preempt-depth \n");
seq_puts(m, "# |||| /_--=> lock-depth \n");
seq_puts(m, "# |||||/ delay \n");
seq_puts(m, "# cmd pid |||||| time | caller \n");
seq_puts(m, "# \\ / |||||| \\ | / \n");
seq_puts(m, "# |||| / delay \n");
seq_puts(m, "# cmd pid ||||| time | caller \n");
seq_puts(m, "# \\ / ||||| \\ | / \n");
}
static void print_func_help_header(struct seq_file *m)

1
kernel/trace/trace_events.c
View file

@ -116,7 +116,6 @@ static int trace_define_common_fields(void)
__common_field(unsigned char, flags);
__common_field(unsigned char, preempt_count);
__common_field(int, pid);
__common_field(int, lock_depth);
return ret;
}

10
kernel/trace/trace_output.c
View file

@ -529,7 +529,7 @@ seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
* @entry: The trace entry field from the ring buffer
*
* Prints the generic fields of irqs off, in hard or softirq, preempt
* count and lock depth.
* count.
*/
int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
{
@ -554,13 +554,7 @@ int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
else
ret = trace_seq_putc(s, '.');
if (!ret)
return 0;
if (entry->lock_depth < 0)
return trace_seq_putc(s, '.');
return trace_seq_printf(s, "%d", entry->lock_depth);
return ret;
}
static int