cpu/hotplug: Add tracepoints
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>
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include/trace/events/cpuhp.h
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66
include/trace/events/cpuhp.h
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM cpuhp
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#if !defined(_TRACE_CPUHP_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_CPUHP_H
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#include <linux/tracepoint.h>
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TRACE_EVENT(cpuhp_enter,
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TP_PROTO(unsigned int cpu,
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int target,
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int idx,
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int (*fun)(unsigned int)),
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TP_ARGS(cpu, target, idx, fun),
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TP_STRUCT__entry(
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__field( unsigned int, cpu )
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__field( int, target )
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__field( int, idx )
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__field( void *, fun )
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),
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TP_fast_assign(
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__entry->cpu = cpu;
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__entry->target = target;
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__entry->idx = idx;
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__entry->fun = fun;
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),
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TP_printk("cpu: %04u target: %3d step: %3d (%pf)",
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__entry->cpu, __entry->target, __entry->idx, __entry->fun)
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);
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TRACE_EVENT(cpuhp_exit,
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TP_PROTO(unsigned int cpu,
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int state,
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int idx,
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int ret),
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TP_ARGS(cpu, state, idx, ret),
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TP_STRUCT__entry(
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__field( unsigned int, cpu )
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__field( int, state )
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__field( int, idx )
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__field( int, ret )
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),
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TP_fast_assign(
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__entry->cpu = cpu;
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__entry->state = state;
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__entry->idx = idx;
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__entry->ret = ret;
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),
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TP_printk(" cpu: %04u state: %3d step: %3d ret: %d",
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__entry->cpu, __entry->state, __entry->idx, __entry->ret)
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);
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#endif
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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