Tracing updates for 5.14:

- Added option for per CPU threads to the hwlat tracer
 
  - Have hwlat tracer handle hotplug CPUs
 
  - New tracer: osnoise, that detects latency caused by interrupts, softirqs
    and scheduling of other tasks.
 
  - Added timerlat tracer that creates a thread and measures in detail what
    sources of latency it has for wake ups.
 
  - Removed the "success" field of the sched_wakeup trace event.
    This has been hardcoded as "1" since 2015, no tooling should be looking
    at it now. If one exists, we can revert this commit, fix that tool and
    try to remove it again in the future.
 
  - tgid mapping fixed to handle more than PID_MAX_DEFAULT pids/tgids.
 
  - New boot command line option "tp_printk_stop", as tp_printk causes trace
    events to write to console. When user space starts, this can easily live
    lock the system. Having a boot option to stop just after boot up is
    useful to prevent that from happening.
 
  - Have ftrace_dump_on_oops boot command line option take numbers that match
    the numbers shown in /proc/sys/kernel/ftrace_dump_on_oops.
 
  - Bootconfig clean ups, fixes and enhancements.
 
  - New ktest script that tests bootconfig options.
 
  - Add tracepoint_probe_register_may_exist() to register a tracepoint
    without triggering a WARN*() if it already exists. BPF has a path from
    user space that can do this. All other paths are considered a bug.
 
  - Small clean ups and fixes
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Merge tag 'trace-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing updates from Steven Rostedt:

 - Added option for per CPU threads to the hwlat tracer

 - Have hwlat tracer handle hotplug CPUs

 - New tracer: osnoise, that detects latency caused by interrupts,
   softirqs and scheduling of other tasks.

 - Added timerlat tracer that creates a thread and measures in detail
   what sources of latency it has for wake ups.

 - Removed the "success" field of the sched_wakeup trace event. This has
   been hardcoded as "1" since 2015, no tooling should be looking at it
   now. If one exists, we can revert this commit, fix that tool and try
   to remove it again in the future.

 - tgid mapping fixed to handle more than PID_MAX_DEFAULT pids/tgids.

 - New boot command line option "tp_printk_stop", as tp_printk causes
   trace events to write to console. When user space starts, this can
   easily live lock the system. Having a boot option to stop just after
   boot up is useful to prevent that from happening.

 - Have ftrace_dump_on_oops boot command line option take numbers that
   match the numbers shown in /proc/sys/kernel/ftrace_dump_on_oops.

 - Bootconfig clean ups, fixes and enhancements.

 - New ktest script that tests bootconfig options.

 - Add tracepoint_probe_register_may_exist() to register a tracepoint
   without triggering a WARN*() if it already exists. BPF has a path
   from user space that can do this. All other paths are considered a
   bug.

 - Small clean ups and fixes

* tag 'trace-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (49 commits)
  tracing: Resize tgid_map to pid_max, not PID_MAX_DEFAULT
  tracing: Simplify & fix saved_tgids logic
  treewide: Add missing semicolons to __assign_str uses
  tracing: Change variable type as bool for clean-up
  trace/timerlat: Fix indentation on timerlat_main()
  trace/osnoise: Make 'noise' variable s64 in run_osnoise()
  tracepoint: Add tracepoint_probe_register_may_exist() for BPF tracing
  tracing: Fix spelling in osnoise tracer "interferences" -> "interference"
  Documentation: Fix a typo on trace/osnoise-tracer
  trace/osnoise: Fix return value on osnoise_init_hotplug_support
  trace/osnoise: Make interval u64 on osnoise_main
  trace/osnoise: Fix 'no previous prototype' warnings
  tracing: Have osnoise_main() add a quiescent state for task rcu
  seq_buf: Make trace_seq_putmem_hex() support data longer than 8
  seq_buf: Fix overflow in seq_buf_putmem_hex()
  trace/osnoise: Support hotplug operations
  trace/hwlat: Support hotplug operations
  trace/hwlat: Protect kdata->kthread with get/put_online_cpus
  trace: Add timerlat tracer
  trace: Add osnoise tracer
  ...

include/trace/events/btrfs.h

@@ -1092,7 +1092,7 @@ TRACE_EVENT(btrfs_trigger_flush,
 		__entry->flags	= flags;
 		__entry->bytes	= bytes;
 		__entry->flush	= flush;
-		__assign_str(reason, reason)
+		__assign_str(reason, reason);
 	),
 
 	TP_printk_btrfs("%s: flush=%d(%s) flags=%llu(%s) bytes=%llu",

include/trace/events/dma_fence.h

@@ -23,8 +23,8 @@ DECLARE_EVENT_CLASS(dma_fence,
 	),
 
 	TP_fast_assign(
-		__assign_str(driver, fence->ops->get_driver_name(fence))
-		__assign_str(timeline, fence->ops->get_timeline_name(fence))
+		__assign_str(driver, fence->ops->get_driver_name(fence));
+		__assign_str(timeline, fence->ops->get_timeline_name(fence));
 		__entry->context = fence->context;
 		__entry->seqno = fence->seqno;
 	),

include/trace/events/osnoise.h

@@ -0,0 +1,142 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM osnoise
+
+#if !defined(_OSNOISE_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _OSNOISE_TRACE_H
+
+#include <linux/tracepoint.h>
+TRACE_EVENT(thread_noise,
+
+	TP_PROTO(struct task_struct *t, u64 start, u64 duration),
+
+	TP_ARGS(t, start, duration),
+
+	TP_STRUCT__entry(
+		__array(	char,		comm,	TASK_COMM_LEN)
+		__field(	u64,		start	)
+		__field(	u64,		duration)
+		__field(	pid_t,		pid	)
+	),
+
+	TP_fast_assign(
+		memcpy(__entry->comm, t->comm, TASK_COMM_LEN);
+		__entry->pid = t->pid;
+		__entry->start = start;
+		__entry->duration = duration;
+	),
+
+	TP_printk("%8s:%d start %llu.%09u duration %llu ns",
+		__entry->comm,
+		__entry->pid,
+		__print_ns_to_secs(__entry->start),
+		__print_ns_without_secs(__entry->start),
+		__entry->duration)
+);
+
+TRACE_EVENT(softirq_noise,
+
+	TP_PROTO(int vector, u64 start, u64 duration),
+
+	TP_ARGS(vector, start, duration),
+
+	TP_STRUCT__entry(
+		__field(	u64,		start	)
+		__field(	u64,		duration)
+		__field(	int,		vector	)
+	),
+
+	TP_fast_assign(
+		__entry->vector = vector;
+		__entry->start = start;
+		__entry->duration = duration;
+	),
+
+	TP_printk("%8s:%d start %llu.%09u duration %llu ns",
+		show_softirq_name(__entry->vector),
+		__entry->vector,
+		__print_ns_to_secs(__entry->start),
+		__print_ns_without_secs(__entry->start),
+		__entry->duration)
+);
+
+TRACE_EVENT(irq_noise,
+
+	TP_PROTO(int vector, const char *desc, u64 start, u64 duration),
+
+	TP_ARGS(vector, desc, start, duration),
+
+	TP_STRUCT__entry(
+		__field(	u64,		start	)
+		__field(	u64,		duration)
+		__string(	desc,		desc    )
+		__field(	int,		vector	)
+
+	),
+
+	TP_fast_assign(
+		__assign_str(desc, desc);
+		__entry->vector = vector;
+		__entry->start = start;
+		__entry->duration = duration;
+	),
+
+	TP_printk("%s:%d start %llu.%09u duration %llu ns",
+		__get_str(desc),
+		__entry->vector,
+		__print_ns_to_secs(__entry->start),
+		__print_ns_without_secs(__entry->start),
+		__entry->duration)
+);
+
+TRACE_EVENT(nmi_noise,
+
+	TP_PROTO(u64 start, u64 duration),
+
+	TP_ARGS(start, duration),
+
+	TP_STRUCT__entry(
+		__field(	u64,		start	)
+		__field(	u64,		duration)
+	),
+
+	TP_fast_assign(
+		__entry->start = start;
+		__entry->duration = duration;
+	),
+
+	TP_printk("start %llu.%09u duration %llu ns",
+		__print_ns_to_secs(__entry->start),
+		__print_ns_without_secs(__entry->start),
+		__entry->duration)
+);
+
+TRACE_EVENT(sample_threshold,
+
+	TP_PROTO(u64 start, u64 duration, u64 interference),
+
+	TP_ARGS(start, duration, interference),
+
+	TP_STRUCT__entry(
+		__field(	u64,		start	)
+		__field(	u64,		duration)
+		__field(	u64,		interference)
+	),
+
+	TP_fast_assign(
+		__entry->start = start;
+		__entry->duration = duration;
+		__entry->interference = interference;
+	),
+
+	TP_printk("start %llu.%09u duration %llu ns interference %llu",
+		__print_ns_to_secs(__entry->start),
+		__print_ns_without_secs(__entry->start),
+		__entry->duration,
+		__entry->interference)
+);
+
+#endif /* _TRACE_OSNOISE_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>

include/trace/events/rpcgss.h

@@ -152,7 +152,7 @@ DECLARE_EVENT_CLASS(rpcgss_ctx_class,
 	TP_fast_assign(
 		__entry->cred = gc;
 		__entry->service = gc->gc_service;
-		__assign_str(principal, gc->gc_principal)
+		__assign_str(principal, gc->gc_principal);
 	),
 
 	TP_printk("cred=%p service=%s principal='%s'",
@@ -535,7 +535,7 @@ TRACE_EVENT(rpcgss_upcall_msg,
 	),
 
 	TP_fast_assign(
-		__assign_str(msg, buf)
+		__assign_str(msg, buf);
 	),
 
 	TP_printk("msg='%s'", __get_str(msg))

include/trace/events/sched.h

@@ -148,7 +148,6 @@ DECLARE_EVENT_CLASS(sched_wakeup_template,
 		__array(	char,	comm,	TASK_COMM_LEN	)
 		__field(	pid_t,	pid			)
 		__field(	int,	prio			)
-		__field(	int,	success			)
 		__field(	int,	target_cpu		)
 	),
 
@@ -156,7 +155,6 @@ DECLARE_EVENT_CLASS(sched_wakeup_template,
 		memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
 		__entry->pid		= p->pid;
 		__entry->prio		= p->prio; /* XXX SCHED_DEADLINE */
-		__entry->success	= 1; /* rudiment, kill when possible */
 		__entry->target_cpu	= task_cpu(p);
 	),
 

include/trace/events/sunrpc.h

@@ -154,8 +154,8 @@ TRACE_EVENT(rpc_clnt_new,
 		__entry->client_id = clnt->cl_clid;
 		__assign_str(addr, xprt->address_strings[RPC_DISPLAY_ADDR]);
 		__assign_str(port, xprt->address_strings[RPC_DISPLAY_PORT]);
-		__assign_str(program, program)
-		__assign_str(server, server)
+		__assign_str(program, program);
+		__assign_str(server, server);
 	),
 
 	TP_printk("client=%u peer=[%s]:%s program=%s server=%s",
@@ -180,8 +180,8 @@ TRACE_EVENT(rpc_clnt_new_err,
 
 	TP_fast_assign(
 		__entry->error = error;
-		__assign_str(program, program)
-		__assign_str(server, server)
+		__assign_str(program, program);
+		__assign_str(server, server);
 	),
 
 	TP_printk("program=%s server=%s error=%d",
@@ -284,8 +284,8 @@ TRACE_EVENT(rpc_request,
 		__entry->client_id = task->tk_client->cl_clid;
 		__entry->version = task->tk_client->cl_vers;
 		__entry->async = RPC_IS_ASYNC(task);
-		__assign_str(progname, task->tk_client->cl_program->name)
-		__assign_str(procname, rpc_proc_name(task))
+		__assign_str(progname, task->tk_client->cl_program->name);
+		__assign_str(procname, rpc_proc_name(task));
 	),
 
 	TP_printk("task:%u@%u %sv%d %s (%ssync)",
@@ -494,10 +494,10 @@ DECLARE_EVENT_CLASS(rpc_reply_event,
 		__entry->task_id = task->tk_pid;
 		__entry->client_id = task->tk_client->cl_clid;
 		__entry->xid = be32_to_cpu(task->tk_rqstp->rq_xid);
-		__assign_str(progname, task->tk_client->cl_program->name)
+		__assign_str(progname, task->tk_client->cl_program->name);
 		__entry->version = task->tk_client->cl_vers;
-		__assign_str(procname, rpc_proc_name(task))
-		__assign_str(servername, task->tk_xprt->servername)
+		__assign_str(procname, rpc_proc_name(task));
+		__assign_str(servername, task->tk_xprt->servername);
 	),
 
 	TP_printk("task:%u@%d server=%s xid=0x%08x %sv%d %s",
@@ -622,8 +622,8 @@ TRACE_EVENT(rpc_stats_latency,
 		__entry->task_id = task->tk_pid;
 		__entry->xid = be32_to_cpu(task->tk_rqstp->rq_xid);
 		__entry->version = task->tk_client->cl_vers;
-		__assign_str(progname, task->tk_client->cl_program->name)
-		__assign_str(procname, rpc_proc_name(task))
+		__assign_str(progname, task->tk_client->cl_program->name);
+		__assign_str(procname, rpc_proc_name(task));
 		__entry->backlog = ktime_to_us(backlog);
 		__entry->rtt = ktime_to_us(rtt);
 		__entry->execute = ktime_to_us(execute);
@@ -669,15 +669,15 @@ TRACE_EVENT(rpc_xdr_overflow,
 			__entry->task_id = task->tk_pid;
 			__entry->client_id = task->tk_client->cl_clid;
 			__assign_str(progname,
-				     task->tk_client->cl_program->name)
+				     task->tk_client->cl_program->name);
 			__entry->version = task->tk_client->cl_vers;
-			__assign_str(procedure, task->tk_msg.rpc_proc->p_name)
+			__assign_str(procedure, task->tk_msg.rpc_proc->p_name);
 		} else {
 			__entry->task_id = 0;
 			__entry->client_id = 0;
-			__assign_str(progname, "unknown")
+			__assign_str(progname, "unknown");
 			__entry->version = 0;
-			__assign_str(procedure, "unknown")
+			__assign_str(procedure, "unknown");
 		}
 		__entry->requested = requested;
 		__entry->end = xdr->end;
@@ -735,9 +735,9 @@ TRACE_EVENT(rpc_xdr_alignment,
 		__entry->task_id = task->tk_pid;
 		__entry->client_id = task->tk_client->cl_clid;
 		__assign_str(progname,
-			     task->tk_client->cl_program->name)
+			     task->tk_client->cl_program->name);
 		__entry->version = task->tk_client->cl_vers;
-		__assign_str(procedure, task->tk_msg.rpc_proc->p_name)
+		__assign_str(procedure, task->tk_msg.rpc_proc->p_name);
 
 		__entry->offset = offset;
 		__entry->copied = copied;
@@ -1107,9 +1107,9 @@ TRACE_EVENT(xprt_retransmit,
 		__entry->xid = be32_to_cpu(rqst->rq_xid);
 		__entry->ntrans = rqst->rq_ntrans;
 		__assign_str(progname,
-			     task->tk_client->cl_program->name)
+			     task->tk_client->cl_program->name);
 		__entry->version = task->tk_client->cl_vers;
-		__assign_str(procedure, task->tk_msg.rpc_proc->p_name)
+		__assign_str(procedure, task->tk_msg.rpc_proc->p_name);
 	),
 
 	TP_printk(
@@ -1842,7 +1842,7 @@ TRACE_EVENT(svc_xprt_accept,
 
 	TP_fast_assign(
 		__assign_str(addr, xprt->xpt_remotebuf);
-		__assign_str(protocol, xprt->xpt_class->xcl_name)
+		__assign_str(protocol, xprt->xpt_class->xcl_name);
 		__assign_str(service, service);
 	),
 

include/trace/events/writeback.h

@@ -36,7 +36,8 @@
 	EM( WB_REASON_PERIODIC,			"periodic")		\
 	EM( WB_REASON_LAPTOP_TIMER,		"laptop_timer")		\
 	EM( WB_REASON_FS_FREE_SPACE,		"fs_free_space")	\
-	EMe(WB_REASON_FORKER_THREAD,		"forker_thread")
+	EM( WB_REASON_FORKER_THREAD,		"forker_thread")	\
+	EMe(WB_REASON_FOREIGN_FLUSH,		"foreign_flush")
 
 WB_WORK_REASON
 

include/trace/trace_events.h

@@ -358,6 +358,21 @@ TRACE_MAKE_SYSTEM_STR();
 	trace_print_hex_dump_seq(p, prefix_str, prefix_type,		\
 				 rowsize, groupsize, buf, len, ascii)
 
+#undef __print_ns_to_secs
+#define __print_ns_to_secs(value)			\
+	({						\
+		u64 ____val = (u64)(value);		\
+		do_div(____val, NSEC_PER_SEC);		\
+		____val;				\
+	})
+
+#undef __print_ns_without_secs
+#define __print_ns_without_secs(value)			\
+	({						\
+		u64 ____val = (u64)(value);		\
+		(u32) do_div(____val, NSEC_PER_SEC);	\
+	})
+
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
 static notrace enum print_line_t					\
@@ -736,6 +751,16 @@ static inline void ftrace_test_probe_##call(void)			\
 #undef __print_array
 #undef __print_hex_dump
 
+/*
+ * The below is not executed in the kernel. It is only what is
+ * displayed in the print format for userspace to parse.
+ */
+#undef __print_ns_to_secs
+#define __print_ns_to_secs(val) (val) / 1000000000UL
+
+#undef __print_ns_without_secs
+#define __print_ns_without_secs(val) (val) % 1000000000UL
+
 #undef TP_printk
 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)