aboutsummaryrefslogtreecommitdiff
path: root/kernel
diff options
context:
space:
mode:
authorJason Wessel <jason.wessel@windriver.com>2010-08-05 09:22:23 -0500
committerJason Wessel <jason.wessel@windriver.com>2010-08-05 09:22:23 -0500
commit19063c776fe745fab11216422cf56489ee83b452 (patch)
treea08994bd7badecc81ac04f4b6c4732986dea8588 /kernel
parent955b61e597984745fb7d34c75708f6503b6aaeab (diff)
downloadvexpress-lsk-19063c776fe745fab11216422cf56489ee83b452.tar.gz
ftrace,kdb: Allow dumping a specific cpu's buffer with ftdump
In systems with more than one processor it is desirable to look at the per cpu trace buffers. Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> CC: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_kdb.c37
1 files changed, 27 insertions, 10 deletions
diff --git a/kernel/trace/trace_kdb.c b/kernel/trace/trace_kdb.c
index 44cbda25b0a..7b8ecd751d9 100644
--- a/kernel/trace/trace_kdb.c
+++ b/kernel/trace/trace_kdb.c
@@ -17,7 +17,7 @@
#include "trace.h"
#include "trace_output.h"
-static void ftrace_dump_buf(int skip_lines)
+static void ftrace_dump_buf(int skip_lines, long cpu_file)
{
/* use static because iter can be a bit big for the stack */
static struct trace_iterator iter;
@@ -44,13 +44,20 @@ static void ftrace_dump_buf(int skip_lines)
iter.iter_flags |= TRACE_FILE_LAT_FMT;
iter.pos = -1;
- for_each_tracing_cpu(cpu) {
- iter.buffer_iter[cpu] =
+ if (cpu_file == TRACE_PIPE_ALL_CPU) {
+ for_each_tracing_cpu(cpu) {
+ iter.buffer_iter[cpu] =
ring_buffer_read_prepare(iter.tr->buffer, cpu);
- ring_buffer_read_start(iter.buffer_iter[cpu]);
- tracing_iter_reset(&iter, cpu);
+ ring_buffer_read_start(iter.buffer_iter[cpu]);
+ tracing_iter_reset(&iter, cpu);
+ }
+ } else {
+ iter.cpu_file = cpu_file;
+ iter.buffer_iter[cpu_file] =
+ ring_buffer_read_prepare(iter.tr->buffer, cpu_file);
+ ring_buffer_read_start(iter.buffer_iter[cpu_file]);
+ tracing_iter_reset(&iter, cpu_file);
}
-
if (!trace_empty(&iter))
trace_find_next_entry_inc(&iter);
while (!trace_empty(&iter)) {
@@ -91,9 +98,10 @@ out:
static int kdb_ftdump(int argc, const char **argv)
{
int skip_lines = 0;
+ long cpu_file;
char *cp;
- if (argc > 1)
+ if (argc > 2)
return KDB_ARGCOUNT;
if (argc) {
@@ -102,8 +110,17 @@ static int kdb_ftdump(int argc, const char **argv)
skip_lines = 0;
}
+ if (argc == 2) {
+ cpu_file = simple_strtol(argv[2], &cp, 0);
+ if (*cp || cpu_file >= NR_CPUS || cpu_file < 0 ||
+ !cpu_online(cpu_file))
+ return KDB_BADINT;
+ } else {
+ cpu_file = TRACE_PIPE_ALL_CPU;
+ }
+
kdb_trap_printk++;
- ftrace_dump_buf(skip_lines);
+ ftrace_dump_buf(skip_lines, cpu_file);
kdb_trap_printk--;
return 0;
@@ -111,8 +128,8 @@ static int kdb_ftdump(int argc, const char **argv)
static __init int kdb_ftrace_register(void)
{
- kdb_register_repeat("ftdump", kdb_ftdump, "", "Dump ftrace log",
- 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("ftdump", kdb_ftdump, "[skip_#lines] [cpu]",
+ "Dump ftrace log", 0, KDB_REPEAT_NONE);
return 0;
}