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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-11-01 19:53:34 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-04 11:01:35 +0100 |
| commit | 69f698adcf43930a283f630395a1bb781962cfe6 (patch) | |
| tree | 4dfe926e8f562fca011b5d6f6fa097c964988f02 /drivers/char | |
| parent | b2a866f9344cb30d7ddf5d67b5b8393daf8bef07 (diff) | |
| download | linux-69f698adcf43930a283f630395a1bb781962cfe6.tar.gz linux-69f698adcf43930a283f630395a1bb781962cfe6.tar.bz2 linux-69f698adcf43930a283f630395a1bb781962cfe6.zip | |
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')
| -rw-r--r-- | drivers/char/sysrq.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c index ce0d9da52a8a..94966edfb44d 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 */ |