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Date: Tue, 08 Sep 2009 21:34:39 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: Li Zefan <lizf@...fujitsu.com> Cc: Ingo Molnar <mingo@...e.hu>, Frederic Weisbecker <fweisbec@...il.com>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 1/2] tracing: Add sysctl to enable/disable tracing on oops On Wed, 2009-09-09 at 09:15 +0800, Li Zefan wrote: > Currently we always disable tracing on oops, and this patch > adds a sysctl so one can choose to enable it. Hmm, we already have a way to enable it. # echo 1 > /debug/tracing/tracing_on -- Steve > > Signed-off-by: Li Zefan <lizf@...fujitsu.com> > --- > include/linux/kernel.h | 2 ++ > kernel/panic.c | 3 ++- > kernel/sysctl.c | 10 ++++++++++ > kernel/trace/ring_buffer.c | 2 ++ > 4 files changed, 16 insertions(+), 1 deletions(-) > > diff --git a/include/linux/kernel.h b/include/linux/kernel.h > index f61039e..5c4528f 100644 > --- a/include/linux/kernel.h > +++ b/include/linux/kernel.h > @@ -516,12 +516,14 @@ static inline char *pack_hex_byte(char *buf, u8 byte) > * Most likely, you want to use tracing_on/tracing_off. > */ > #ifdef CONFIG_RING_BUFFER > +extern int trace_on_oops; > void tracing_on(void); > void tracing_off(void); > /* trace_off_permanent stops recording with no way to bring it back */ > void tracing_off_permanent(void); > int tracing_is_on(void); > #else > +#define trace_on_oops 0 > static inline void tracing_on(void) { } > static inline void tracing_off(void) { } > static inline void tracing_off_permanent(void) { } > diff --git a/kernel/panic.c b/kernel/panic.c > index 512ab73..22ec502 100644 > --- a/kernel/panic.c > +++ b/kernel/panic.c > @@ -301,7 +301,8 @@ int oops_may_print(void) > */ > void oops_enter(void) > { > - tracing_off(); > + if (!trace_on_oops) > + tracing_off(); > /* can't trust the integrity of the kernel anymore: */ > debug_locks_off(); > do_oops_enter_exit(); > diff --git a/kernel/sysctl.c b/kernel/sysctl.c > index cdbe8d0..a768c15 100644 > --- a/kernel/sysctl.c > +++ b/kernel/sysctl.c > @@ -537,6 +537,16 @@ static struct ctl_table kern_table[] = { > .proc_handler = &stack_trace_sysctl, > }, > #endif > +#ifdef CONFIG_RING_BUFFER > + { > + .ctl_name = CTL_UNNUMBERED, > + .procname = "trace_on_oops", > + .data = &trace_on_oops, > + .maxlen = sizeof(int), > + .mode = 0644, > + .proc_handler = &proc_dointvec, > + }, > +#endif > #ifdef CONFIG_TRACING > { > .ctl_name = CTL_UNNUMBERED, > diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c > index 454e74e..fc10962 100644 > --- a/kernel/trace/ring_buffer.c > +++ b/kernel/trace/ring_buffer.c > @@ -155,6 +155,8 @@ static unsigned long ring_buffer_flags __read_mostly = RB_BUFFERS_ON; > > #define BUF_PAGE_HDR_SIZE offsetof(struct buffer_data_page, data) > > +int trace_on_oops; > + > /** > * tracing_on - enable all tracing buffers > * -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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