Hi - On Wed, Apr 03, 2013 at 02:49:53PM +0200, Frederic Weisbecker wrote:
> Sounds good, would you like to propose a version? We are also > interested in a timer tick event tracepoint for dynticks debugging. How about this? Author: Frank Ch. Eigler <[email protected]> Date: Wed Apr 3 10:35:21 2013 -0400 profiling: add profile_tick tracepoint Commit ba6fdda4 removed the timer_hook mechanism for modules to listen to profiling timer ticks (without having to set up more complicated perf mechanisms). To reduce the impact on out-of-tree users, a TRACE_EVENT-flavoured tracepoint is added in its place. Tested with perf and systemtap. Cc: Frederic Weisbecker <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Mel Gorman <[email protected]> Signed-off-by: Frank Ch. Eigler <[email protected]> diff --git a/include/trace/events/profile.h b/include/trace/events/profile.h new file mode 100644 index 0000000..b48b6fe --- /dev/null +++ b/include/trace/events/profile.h @@ -0,0 +1,35 @@ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM profile + +#if !defined(_TRACE_PROFILE_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_PROFILE_H + +#include <linux/tracepoint.h> + + +struct pt_regs; + +/** + * profile_tick - called when the profiling timer ticks + * @regs: pointer to struct pt_regs* + */ + +TRACE_EVENT(profile_tick, + TP_PROTO(int type, struct pt_regs *regs), + TP_ARGS(type, regs), + TP_STRUCT__entry( + __field( int, type ) + __field( struct pt_regs*, regs ) + ), + TP_fast_assign( + __entry->type = type; + __entry->regs = regs; + ), + TP_printk("type=%d regs=%p", __entry->type, __entry->regs) +); + + +#endif /* _TRACE_PROFILE_H */ + +/* This part must be outside protection */ +#include <trace/define_trace.h> diff --git a/kernel/profile.c b/kernel/profile.c index dc3384e..d61f921 100644 --- a/kernel/profile.c +++ b/kernel/profile.c @@ -29,6 +29,9 @@ #include <asm/irq_regs.h> #include <asm/ptrace.h> +#define CREATE_TRACE_POINTS +#include <trace/events/profile.h> + struct profile_hit { u32 pc, hits; }; @@ -414,6 +417,8 @@ void profile_tick(int type) { struct pt_regs *regs = get_irq_regs(); + trace_profile_tick(type, regs); + if (!user_mode(regs) && prof_cpu_mask != NULL && cpumask_test_cpu(smp_processor_id(), prof_cpu_mask)) profile_hit(type, (void *)profile_pc(regs)); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
