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authorArjan van de Ven <arjan@linux.intel.com>2010-08-21 13:07:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-21 13:19:37 -0700
commite36c886a0f9d624377977fa6cae309cfd7f362fa (patch)
treef75e7c3e50a48c671ed4dff33103f601a2204af9 /lib
parent69b26c7ad00fd5b6129400725e2ffb95134a0e1b (diff)
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workqueue: Add basic tracepoints to track workqueue execution
With the introduction of the new unified work queue thread pools, we lost one feature: It's no longer possible to know which worker is causing the CPU to wake out of idle. The result is that PowerTOP now reports a lot of "kworker/a:b" instead of more readable results. This patch adds a pair of tracepoints to the new workqueue code, similar in style to the timer/hrtimer tracepoints. With this pair of tracepoints, the next PowerTOP can correctly report which work item caused the wakeup (and how long it took): Interrupt (43) i915 time 3.51ms wakeups 141 Work ieee80211_iface_work time 0.81ms wakeups 29 Work do_dbs_timer time 0.55ms wakeups 24 Process Xorg time 21.36ms wakeups 4 Timer sched_rt_period_timer time 0.01ms wakeups 1 Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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