diff options
author | Arjan van de Ven <arjan@linux.intel.com> | 2010-08-21 13:07:26 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-21 13:19:37 -0700 |
commit | e36c886a0f9d624377977fa6cae309cfd7f362fa (patch) | |
tree | f75e7c3e50a48c671ed4dff33103f601a2204af9 /net | |
parent | 69b26c7ad00fd5b6129400725e2ffb95134a0e1b (diff) | |
download | op-kernel-dev-e36c886a0f9d624377977fa6cae309cfd7f362fa.zip op-kernel-dev-e36c886a0f9d624377977fa6cae309cfd7f362fa.tar.gz |
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>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions