[PATCH 02/10] freezer: skip waking up tasks with PF_FREEZER_SKIP set
tj at kernel.org
Mon Apr 29 22:08:31 UTC 2013
On Mon, Apr 29, 2013 at 03:02:19PM -0700, Colin Cross wrote:
> See the first patch in the series (which isn't available in the
> archive yet, so I can't link to it). The short version is that
It didn't arrive in my lkml folder either. Maybe vger is taking some
time distributing emails.
> 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. This patch series takes the most common userspace sleep
> points and converts them to PF_FREEZER_SKIP, which reduces the number
> of context switches for every suspend or resume event on a
> freshly-booted Android device from 1000 to 25, and reduces the time
Ah, okay, so you're spreading PF_FREEZER_SKIP. When you post patches
which touch the freezer can you please cc me and Oleg Nesterov
<oleg at redhat.com> (I'll ping him this time)? Freezer has been very
subtly broken in various ways and many kthread users are still broken,
so let's tread carefully.
> spent freezing by a factor of 5. It will have a similar effect on a
> non-Android system, although those generally don't care about
> suspend/resume optimization.
Yeah, if it's something which makes actual difference rather than
"this seems to be a good idea" thing, sure, let's find a way.
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