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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-11-01 19:53:34 +0100
committerIngo Molnar <mingo@elte.hu>2008-11-04 11:01:35 +0100
commit69f698adcf43930a283f630395a1bb781962cfe6 (patch)
tree4dfe926e8f562fca011b5d6f6fa097c964988f02 /drivers/char/sysrq.c
parentb2a866f9344cb30d7ddf5d67b5b8393daf8bef07 (diff)
downloadop-kernel-dev-69f698adcf43930a283f630395a1bb781962cfe6.zip
op-kernel-dev-69f698adcf43930a283f630395a1bb781962cfe6.tar.gz
ftrace: sysrq-z to dump the buffers
Impact: add SysRq-z support to dump trace buffers Allows one to force an ftrace dump from sysrq Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/char/sysrq.c')
-rw-r--r--drivers/char/sysrq.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index ce0d9da..94966ed 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -274,6 +274,22 @@ static struct sysrq_key_op sysrq_showstate_blocked_op = {
.enable_mask = SYSRQ_ENABLE_DUMP,
};
+#ifdef CONFIG_TRACING
+#include <linux/ftrace.h>
+
+static void sysrq_ftrace_dump(int key, struct tty_struct *tty)
+{
+ ftrace_dump();
+}
+static struct sysrq_key_op sysrq_ftrace_dump_op = {
+ .handler = sysrq_ftrace_dump,
+ .help_msg = "dumpZ-ftrace-buffer",
+ .action_msg = "Dump ftrace buffer",
+ .enable_mask = SYSRQ_ENABLE_DUMP,
+};
+#else
+#define sysrq_ftrace_dump_op (*(struct sysrq_key_op *)0)
+#endif
static void sysrq_handle_showmem(int key, struct tty_struct *tty)
{
@@ -406,7 +422,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
NULL, /* x */
/* y: May be registered on sparc64 for global register dump */
NULL, /* y */
- NULL /* z */
+ &sysrq_ftrace_dump_op, /* z */
};
/* key2index calculation, -1 on invalid index */
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