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Subject[PATCH] ftrace: sysrq-z to dump the buffers
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Allows one to force an ftrace dump from sysrq

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index ce0d9da..e20d6db 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_FTRACE
+#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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