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| author | Colin Cross <ccross@android.com> | 2013-05-06 23:50:11 +0000 |
|---|---|---|
| committer | Arve Hjønnevåg <arve@android.com> | 2013-07-01 15:40:39 -0700 |
| commit | 44e77f70f60bdbea4c2b833ae895d6c0357953f4 (patch) | |
| tree | 0b2965c12b3e6f674f705e7a6d1c128d58cd183f /kernel/mutex-debug.h | |
| parent | a57d997d090d0abe8317dca02320ea08bb773e80 (diff) | |
| download | olio-linux-3.10-44e77f70f60bdbea4c2b833ae895d6c0357953f4.tar.xz olio-linux-3.10-44e77f70f60bdbea4c2b833ae895d6c0357953f4.zip | |
freezer: skip waking up tasks with PF_FREEZER_SKIP set
Android goes through suspend/resume very often (every few seconds when
on a busy wifi network with the screen off), and a significant portion
of the energy used to go in and out of suspend is spent in the
freezer. If a task has called freezer_do_not_count(), don't bother
waking it up. If it happens to wake up later it will call
freezer_count() and immediately enter the refrigerator.
Combined with patches to convert freezable helpers to use
freezer_do_not_count() and convert common sites where idle userspace
tasks are blocked to use the freezable helpers, this reduces the
time and energy required to suspend and resume.
Change-Id: I6ba019d24273619849af757a413271da3261d7db
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/mutex-debug.h')
0 files changed, 0 insertions, 0 deletions