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e1d8aa9f1d
Impact: new tracer The workqueue tracer provides some statistical informations about each cpu workqueue thread such as the number of the works inserted and executed since their creation. It can help to evaluate the amount of work each of them have to perform. For example it can help a developer to decide whether he should choose a per cpu workqueue instead of a singlethreaded one. It only traces statistical informations for now but it will probably later provide event tracing too. Such a tracer could help too, and be improved, to help rt priority sorted workqueue development. To have a snapshot of the workqueues state at any time, just do cat /debugfs/tracing/trace_stat/workqueues Ie: 1 125 125 reiserfs/1 1 0 0 scsi_tgtd/1 1 0 0 aio/1 1 0 0 ata/1 1 114 114 kblockd/1 1 0 0 kintegrityd/1 1 2147 2147 events/1 0 0 0 kpsmoused 0 105 105 reiserfs/0 0 0 0 scsi_tgtd/0 0 0 0 aio/0 0 0 0 ata_aux 0 0 0 ata/0 0 0 0 cqueue 0 0 0 kacpi_notify 0 0 0 kacpid 0 149 149 kblockd/0 0 0 0 kintegrityd/0 0 1000 1000 khelper 0 2270 2270 events/0 Changes in V2: _ Drop the static array based on NR_CPU and dynamically allocate the stat array with num_possible_cpus() and other cpu mask facilities.... _ Trace workqueue insertion at a bit lower level (insert_work instead of queue_work) to handle even the workqueue barriers. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
26 lines
728 B
C
26 lines
728 B
C
#ifndef __TRACE_WORKQUEUE_H
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#define __TRACE_WORKQUEUE_H
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#include <linux/tracepoint.h>
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#include <linux/workqueue.h>
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#include <linux/sched.h>
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DECLARE_TRACE(workqueue_insertion,
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TPPROTO(struct task_struct *wq_thread, struct work_struct *work),
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TPARGS(wq_thread, work));
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DECLARE_TRACE(workqueue_execution,
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TPPROTO(struct task_struct *wq_thread, struct work_struct *work),
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TPARGS(wq_thread, work));
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/* Trace the creation of one workqueue thread on a cpu */
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DECLARE_TRACE(workqueue_creation,
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TPPROTO(struct task_struct *wq_thread, int cpu),
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TPARGS(wq_thread, cpu));
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DECLARE_TRACE(workqueue_destruction,
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TPPROTO(struct task_struct *wq_thread),
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TPARGS(wq_thread));
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#endif /* __TRACE_WORKQUEUE_H */
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