linux-kernel - Re: [PATCH 1/1] tracing, workqueuetrace: Make workqueue tracepoints use TRACE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 13 Apr 2009 10:44:27 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Zhaolei <zhaolei@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tom Zanussi <tzanussi@...il.com>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] tracing, workqueuetrace: Make workqueue tracepoints use TRACE_EVENT macro

Hi,

hehe, I also have similar patch in my local patch queue ;)

> +TRACE_EVENT(workqueue_insertion,
> +
> +	TP_PROTO(struct task_struct *wq_thread, struct work_struct *work),
> +
> +	TP_ARGS(wq_thread, work),
> +
> +	TP_STRUCT__entry(
> +		__array(	char,			thread_comm,	TASK_COMM_LEN	)
> +		__field(	pid_t,			thread_pid			)
> +		__field(	struct work_struct *,	work				)
> +		__field(	work_func_t,		func				)
> +	),
> +
> +	TP_fast_assign(
> +		memcpy(__entry->thread_comm, wq_thread->comm, TASK_COMM_LEN);
> +		__entry->thread_pid	= wq_thread->pid;
> +		__entry->work		= work;
> +		__entry->func		= work->func;
> +	),
> +
> +	TP_printk("thread=%s:%d work=%p func=%p", __entry->thread_comm,
> +		__entry->thread_pid, __entry->work, __entry->func)
> +);

please don't display raw kernel pointer.

work: unnecessary. it's internal information and func name provide enough
      information.
func: %pF can print pritty format


> +
> +TRACE_EVENT(workqueue_execution,
> +
> +	TP_PROTO(struct task_struct *wq_thread, struct work_struct *work),
> +
> +	TP_ARGS(wq_thread, work),
> +
> +	TP_STRUCT__entry(
> +		__array(	char,			thread_comm,	TASK_COMM_LEN	)
> +		__field(	pid_t,			thread_pid			)
> +		__field(	struct work_struct *,	work				)
> +		__field(	work_func_t,		func				)
> +	),
> +
> +	TP_fast_assign(
> +		memcpy(__entry->thread_comm, wq_thread->comm, TASK_COMM_LEN);
> +		__entry->thread_pid	= wq_thread->pid;
> +		__entry->work		= work;
> +		__entry->func		= work->func;
> +	),
> +
> +	TP_printk("thread=%s:%d work=%p func=%p", __entry->thread_comm,
> +		__entry->thread_pid, __entry->work, __entry->func)
> +);

ditto.

and, I plan to rename this tracepoint to workqueue_handler_entry()
and create workqueue_handler_exit().

It's because stupid driver comsume many cputime in workqueue thread,
it make delay to after work. We need mesure it.


> +
> +/* Trace the creation of one workqueue thread on a cpu */
> +TRACE_EVENT(workqueue_creation,
> +
> +	TP_PROTO(struct task_struct *wq_thread, int cpu),
> +
> +	TP_ARGS(wq_thread, cpu),
> +
> +	TP_STRUCT__entry(
> +		__array(	char,	thread_comm,	TASK_COMM_LEN	)
> +		__field(	pid_t,	thread_pid			)
> +		__field(	int,	cpu				)
> +	),
> +
> +	TP_fast_assign(
> +		memcpy(__entry->thread_comm, wq_thread->comm, TASK_COMM_LEN);
> +		__entry->thread_pid	= wq_thread->pid;
> +		__entry->cpu		= cpu;
> +	),
> +
> +	TP_printk("thread=%s:%d cpu=%d", __entry->thread_comm,
> +		__entry->thread_pid, __entry->cpu)
> +);
> +
> +TRACE_EVENT(workqueue_destruction,
> +
> +	TP_PROTO(struct task_struct *wq_thread),
> +
> +	TP_ARGS(wq_thread),
> +
> +	TP_STRUCT__entry(
> +		__array(	char,	thread_comm,	TASK_COMM_LEN	)
> +		__field(	pid_t,	thread_pid			)
> +	),
> +
> +	TP_fast_assign(
> +		memcpy(__entry->thread_comm, wq_thread->comm, TASK_COMM_LEN);
> +		__entry->thread_pid	= wq_thread->pid;
> +	),
> +
> +	TP_printk("thread=%s:%d", __entry->thread_comm, __entry->thread_pid)
> +);
> +
> +#undef TRACE_SYSTEM
> -- 
> 1.5.5.3
> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/