rcu: Add grace-period, quiescent-state, and call_rcu trace events
Add trace events to record grace-period start and end, quiescent states, CPUs noticing grace-period start and end, grace-period initialization, call_rcu() invocation, tasks blocking in RCU read-side critical sections, tasks exiting those same critical sections, force_quiescent_state() detection of dyntick-idle and offline CPUs, CPUs entering and leaving dyntick-idle mode (except from NMIs), CPUs coming online and going offline, and CPUs being kicked for staying in dyntick-idle mode for too long (as in many weeks, even on 32-bit systems). Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> rcu: Add the rcu flavor to callback trace events The earlier trace events for registering RCU callbacks and for invoking them did not include the RCU flavor (rcu_bh, rcu_preempt, or rcu_sched). This commit adds the RCU flavor to those trace events. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
committed by
Paul E. McKenney
Paul E. McKenney
parent
965a002b4f
commit
d4c08f2ac3
@ -24,7 +24,7 @@ TRACE_EVENT(rcu_utilization,
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TP_ARGS(s),
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TP_STRUCT__entry(
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__field(char *, s)
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__field(char *, s)
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),
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TP_fast_assign(
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@ -34,6 +34,297 @@ TRACE_EVENT(rcu_utilization,
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TP_printk("%s", __entry->s)
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);
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#ifdef CONFIG_RCU_TRACE
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#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)
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/*
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* Tracepoint for grace-period events: starting and ending a grace
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* period ("start" and "end", respectively), a CPU noting the start
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* of a new grace period or the end of an old grace period ("cpustart"
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* and "cpuend", respectively), a CPU passing through a quiescent
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* state ("cpuqs"), a CPU coming online or going offline ("cpuonl"
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* and "cpuofl", respectively), and a CPU being kicked for being too
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* long in dyntick-idle mode ("kick").
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*/
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TRACE_EVENT(rcu_grace_period,
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TP_PROTO(char *rcuname, unsigned long gpnum, char *gpevent),
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TP_ARGS(rcuname, gpnum, gpevent),
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TP_STRUCT__entry(
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__field(char *, rcuname)
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__field(unsigned long, gpnum)
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__field(char *, gpevent)
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),
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TP_fast_assign(
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__entry->rcuname = rcuname;
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__entry->gpnum = gpnum;
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__entry->gpevent = gpevent;
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),
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TP_printk("%s %lu %s",
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__entry->rcuname, __entry->gpnum, __entry->gpevent)
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);
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/*
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* Tracepoint for grace-period-initialization events. These are
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* distinguished by the type of RCU, the new grace-period number, the
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* rcu_node structure level, the starting and ending CPU covered by the
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* rcu_node structure, and the mask of CPUs that will be waited for.
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* All but the type of RCU are extracted from the rcu_node structure.
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*/
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TRACE_EVENT(rcu_grace_period_init,
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TP_PROTO(char *rcuname, unsigned long gpnum, u8 level,
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int grplo, int grphi, unsigned long qsmask),
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TP_ARGS(rcuname, gpnum, level, grplo, grphi, qsmask),
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TP_STRUCT__entry(
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__field(char *, rcuname)
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__field(unsigned long, gpnum)
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__field(u8, level)
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__field(int, grplo)
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__field(int, grphi)
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__field(unsigned long, qsmask)
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),
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TP_fast_assign(
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__entry->rcuname = rcuname;
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__entry->gpnum = gpnum;
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__entry->level = level;
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__entry->grplo = grplo;
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__entry->grphi = grphi;
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__entry->qsmask = qsmask;
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),
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TP_printk("%s %lu %u %d %d %lx",
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__entry->rcuname, __entry->gpnum, __entry->level,
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__entry->grplo, __entry->grphi, __entry->qsmask)
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);
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/*
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* Tracepoint for tasks blocking within preemptible-RCU read-side
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* critical sections. Track the type of RCU (which one day might
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* include SRCU), the grace-period number that the task is blocking
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* (the current or the next), and the task's PID.
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*/
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TRACE_EVENT(rcu_preempt_task,
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TP_PROTO(char *rcuname, int pid, unsigned long gpnum),
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TP_ARGS(rcuname, pid, gpnum),
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TP_STRUCT__entry(
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__field(char *, rcuname)
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__field(unsigned long, gpnum)
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__field(int, pid)
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),
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TP_fast_assign(
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__entry->rcuname = rcuname;
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__entry->gpnum = gpnum;
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__entry->pid = pid;
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),
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TP_printk("%s %lu %d",
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__entry->rcuname, __entry->gpnum, __entry->pid)
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);
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/*
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* Tracepoint for tasks that blocked within a given preemptible-RCU
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* read-side critical section exiting that critical section. Track the
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* type of RCU (which one day might include SRCU) and the task's PID.
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*/
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TRACE_EVENT(rcu_unlock_preempted_task,
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TP_PROTO(char *rcuname, unsigned long gpnum, int pid),
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TP_ARGS(rcuname, gpnum, pid),
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TP_STRUCT__entry(
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__field(char *, rcuname)
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__field(unsigned long, gpnum)
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__field(int, pid)
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),
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TP_fast_assign(
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__entry->rcuname = rcuname;
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__entry->gpnum = gpnum;
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__entry->pid = pid;
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),
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TP_printk("%s %lu %d", __entry->rcuname, __entry->gpnum, __entry->pid)
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);
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/*
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* Tracepoint for quiescent-state-reporting events. These are
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* distinguished by the type of RCU, the grace-period number, the
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* mask of quiescent lower-level entities, the rcu_node structure level,
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* the starting and ending CPU covered by the rcu_node structure, and
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* whether there are any blocked tasks blocking the current grace period.
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* All but the type of RCU are extracted from the rcu_node structure.
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*/
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TRACE_EVENT(rcu_quiescent_state_report,
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TP_PROTO(char *rcuname, unsigned long gpnum,
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unsigned long mask, unsigned long qsmask,
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u8 level, int grplo, int grphi, int gp_tasks),
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TP_ARGS(rcuname, gpnum, mask, qsmask, level, grplo, grphi, gp_tasks),
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TP_STRUCT__entry(
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__field(char *, rcuname)
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__field(unsigned long, gpnum)
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__field(unsigned long, mask)
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__field(unsigned long, qsmask)
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__field(u8, level)
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__field(int, grplo)
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__field(int, grphi)
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__field(u8, gp_tasks)
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),
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TP_fast_assign(
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__entry->rcuname = rcuname;
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__entry->gpnum = gpnum;
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__entry->mask = mask;
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__entry->qsmask = qsmask;
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__entry->level = level;
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__entry->grplo = grplo;
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__entry->grphi = grphi;
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__entry->gp_tasks = gp_tasks;
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),
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TP_printk("%s %lu %lx>%lx %u %d %d %u",
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__entry->rcuname, __entry->gpnum,
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__entry->mask, __entry->qsmask, __entry->level,
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__entry->grplo, __entry->grphi, __entry->gp_tasks)
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);
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/*
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* Tracepoint for quiescent states detected by force_quiescent_state().
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* These trace events include the type of RCU, the grace-period number
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* that was blocked by the CPU, the CPU itself, and the type of quiescent
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* state, which can be "dti" for dyntick-idle mode, "ofl" for CPU offline,
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* or "kick" when kicking a CPU that has been in dyntick-idle mode for
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* too long.
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*/
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TRACE_EVENT(rcu_fqs,
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TP_PROTO(char *rcuname, unsigned long gpnum, int cpu, char *qsevent),
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TP_ARGS(rcuname, gpnum, cpu, qsevent),
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TP_STRUCT__entry(
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__field(char *, rcuname)
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__field(unsigned long, gpnum)
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__field(int, cpu)
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__field(char *, qsevent)
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),
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TP_fast_assign(
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__entry->rcuname = rcuname;
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__entry->gpnum = gpnum;
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__entry->cpu = cpu;
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__entry->qsevent = qsevent;
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),
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TP_printk("%s %lu %d %s",
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__entry->rcuname, __entry->gpnum,
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__entry->cpu, __entry->qsevent)
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);
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#endif /* #if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) */
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/*
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* Tracepoint for dyntick-idle entry/exit events. These take a string
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* as argument: "Start" for entering dyntick-idle mode and "End" for
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* leaving it.
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*/
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TRACE_EVENT(rcu_dyntick,
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TP_PROTO(char *polarity),
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TP_ARGS(polarity),
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TP_STRUCT__entry(
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__field(char *, polarity)
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),
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TP_fast_assign(
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__entry->polarity = polarity;
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),
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TP_printk("%s", __entry->polarity)
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);
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/*
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* Tracepoint for the registration of a single RCU callback function.
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* The first argument is the type of RCU, the second argument is
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* a pointer to the RCU callback itself, and the third element is the
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* new RCU callback queue length for the current CPU.
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*/
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TRACE_EVENT(rcu_callback,
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TP_PROTO(char *rcuname, struct rcu_head *rhp, long qlen),
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TP_ARGS(rcuname, rhp, qlen),
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TP_STRUCT__entry(
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__field(char *, rcuname)
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__field(void *, rhp)
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__field(void *, func)
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__field(long, qlen)
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),
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TP_fast_assign(
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__entry->rcuname = rcuname;
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__entry->rhp = rhp;
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__entry->func = rhp->func;
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__entry->qlen = qlen;
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),
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TP_printk("%s rhp=%p func=%pf %ld",
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__entry->rcuname, __entry->rhp, __entry->func, __entry->qlen)
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);
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/*
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* Tracepoint for the registration of a single RCU callback of the special
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* kfree() form. The first argument is the RCU type, the second argument
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* is a pointer to the RCU callback, the third argument is the offset
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* of the callback within the enclosing RCU-protected data structure,
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* and the fourth argument is the new RCU callback queue length for the
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* current CPU.
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*/
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TRACE_EVENT(rcu_kfree_callback,
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TP_PROTO(char *rcuname, struct rcu_head *rhp, unsigned long offset,
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long qlen),
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TP_ARGS(rcuname, rhp, offset, qlen),
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TP_STRUCT__entry(
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__field(char *, rcuname)
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__field(void *, rhp)
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__field(unsigned long, offset)
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__field(long, qlen)
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),
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TP_fast_assign(
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__entry->rcuname = rcuname;
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__entry->rhp = rhp;
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__entry->offset = offset;
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__entry->qlen = qlen;
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),
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TP_printk("%s rhp=%p func=%ld %ld",
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__entry->rcuname, __entry->rhp, __entry->offset,
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__entry->qlen)
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);
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/*
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* Tracepoint for marking the beginning rcu_do_batch, performed to start
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* RCU callback invocation. The first argument is the RCU flavor,
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@ -65,50 +356,58 @@ TRACE_EVENT(rcu_batch_start,
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/*
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* Tracepoint for the invocation of a single RCU callback function.
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* The argument is a pointer to the RCU callback itself.
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* The first argument is the type of RCU, and the second argument is
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* a pointer to the RCU callback itself.
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*/
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TRACE_EVENT(rcu_invoke_callback,
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TP_PROTO(struct rcu_head *rhp),
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TP_PROTO(char *rcuname, struct rcu_head *rhp),
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TP_ARGS(rhp),
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TP_ARGS(rcuname, rhp),
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TP_STRUCT__entry(
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__field(void *, rhp)
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__field(void *, func)
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__field(char *, rcuname)
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__field(void *, rhp)
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__field(void *, func)
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),
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TP_fast_assign(
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__entry->rcuname = rcuname;
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__entry->rhp = rhp;
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__entry->func = rhp->func;
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),
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TP_printk("rhp=%p func=%pf", __entry->rhp, __entry->func)
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TP_printk("%s rhp=%p func=%pf",
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__entry->rcuname, __entry->rhp, __entry->func)
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);
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/*
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* Tracepoint for the invocation of a single RCU callback of the special
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* kfree() form. The first argument is a pointer to the RCU callback
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* and the second argument is the offset of the callback within the
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* enclosing RCU-protected data structure.
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* kfree() form. The first argument is the RCU flavor, the second
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* argument is a pointer to the RCU callback, and the third argument
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* is the offset of the callback within the enclosing RCU-protected
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* data structure.
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*/
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TRACE_EVENT(rcu_invoke_kfree_callback,
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TP_PROTO(struct rcu_head *rhp, unsigned long offset),
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TP_PROTO(char *rcuname, struct rcu_head *rhp, unsigned long offset),
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TP_ARGS(rhp, offset),
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TP_ARGS(rcuname, rhp, offset),
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TP_STRUCT__entry(
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__field(void *, rhp)
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__field(char *, rcuname)
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__field(void *, rhp)
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__field(unsigned long, offset)
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),
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TP_fast_assign(
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__entry->rcuname = rcuname;
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__entry->rhp = rhp;
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__entry->offset = offset;
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),
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TP_printk("rhp=%p func=%ld", __entry->rhp, __entry->offset)
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TP_printk("%s rhp=%p func=%ld",
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__entry->rcuname, __entry->rhp, __entry->offset)
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);
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/*
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@ -136,6 +435,24 @@ TRACE_EVENT(rcu_batch_end,
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__entry->rcuname, __entry->callbacks_invoked)
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);
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#else /* #ifdef CONFIG_RCU_TRACE */
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#define trace_rcu_grace_period(rcuname, gpnum, gpevent) do { } while (0)
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#define trace_rcu_grace_period_init(rcuname, gpnum, level, grplo, grphi, qsmask) do { } while (0)
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#define trace_rcu_preempt_task(rcuname, pid, gpnum) do { } while (0)
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#define trace_rcu_unlock_preempted_task(rcuname, gpnum, pid) do { } while (0)
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#define trace_rcu_quiescent_state_report(rcuname, gpnum, mask, qsmask, level, grplo, grphi, gp_tasks) do { } while (0)
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#define trace_rcu_fqs(rcuname, gpnum, cpu, qsevent) do { } while (0)
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#define trace_rcu_dyntick(polarity) do { } while (0)
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#define trace_rcu_callback(rcuname, rhp, qlen) do { } while (0)
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#define trace_rcu_kfree_callback(rcuname, rhp, offset, qlen) do { } while (0)
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#define trace_rcu_batch_start(rcuname, qlen, blimit) do { } while (0)
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#define trace_rcu_invoke_callback(rcuname, rhp) do { } while (0)
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#define trace_rcu_invoke_kfree_callback(rcuname, rhp, offset) do { } while (0)
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#define trace_rcu_batch_end(rcuname, callbacks_invoked) do { } while (0)
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#endif /* #else #ifdef CONFIG_RCU_TRACE */
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#endif /* _TRACE_RCU_H */
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/* This part must be outside protection */
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Reference in New Issue
Block a user