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cpu/hotplug: Add tracepoints

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We want to trace the hotplug machinery. Add tracepoints to track the
invocation of callbacks and their result.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: Rik van Riel <riel@redhat.com>
Cc: Rafael Wysocki <rafael.j.wysocki@intel.com>
Cc: "Srivatsa S. Bhat" <srivatsa@mit.edu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Turner <pjt@google.com>
Link: http://lkml.kernel.org/r/20160226182340.593563875@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2016-02-26 18:43:27 +00:00
parent 984581728e
commit 5ba9ac8e2c
1 changed files with 66 additions and 0 deletions
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66
include/trace/events/cpuhp.h Normal file
View File

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#undef TRACE_SYSTEM
#define TRACE_SYSTEM cpuhp
#if !defined(_TRACE_CPUHP_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_CPUHP_H
#include <linux/tracepoint.h>
TRACE_EVENT(cpuhp_enter,
TP_PROTO(unsigned int cpu,
int target,
int idx,
int (*fun)(unsigned int)),
TP_ARGS(cpu, target, idx, fun),
TP_STRUCT__entry(
__field( unsigned int, cpu )
__field( int, target )
__field( int, idx )
__field( void *, fun )
),
TP_fast_assign(
__entry->cpu = cpu;
__entry->target = target;
__entry->idx = idx;
__entry->fun = fun;
),
TP_printk("cpu: %04u target: %3d step: %3d (%pf)",
__entry->cpu, __entry->target, __entry->idx, __entry->fun)
);
TRACE_EVENT(cpuhp_exit,
TP_PROTO(unsigned int cpu,
int state,
int idx,
int ret),
TP_ARGS(cpu, state, idx, ret),
TP_STRUCT__entry(
__field( unsigned int, cpu )
__field( int, state )
__field( int, idx )
__field( int, ret )
),
TP_fast_assign(
__entry->cpu = cpu;
__entry->state = state;
__entry->idx = idx;
__entry->ret = ret;
),
TP_printk(" cpu: %04u state: %3d step: %3d ret: %d",
__entry->cpu, __entry->state, __entry->idx, __entry->ret)
);
#endif
/* This part must be outside protection */
#include <trace/define_trace.h>