kernel-packages team mailing list archive

[Dmitrijs Ledkovs <launchpad@xxxxxxxxxxxx>]

On 10 October 2013 14:37, Dmitrijs Ledkovs <launchpad@xxxxxxxxxxxx> wrote:
> On 10 October 2013 14:15, Colin King <1234743@xxxxxxxxxxxxxxxxxx> wrote:
>> I believe the library /vendor/lib/hw/hwcomposer.omap4.so depends on
>> these VSYNCs, I'm unsure how the plumbing works between the kernel and
>> this library - is this proprietary code?
>>
>> The kernel just shoves these VSYNC uevents outs for the
>> hwcompiser.omap4.so to handle. I am of the current understanding that it
>> is not used by anything else.
>>
>
> Proprietary or not it's source code is here:
>
> https://android.googlesource.com/platform/hardware/ti/omap4-aah/+/master/hwc/hwc.c
>
> Or at least appears to be and/or similarish.

Which appears to be getting a FD to "kernel" event source, via socket created by
https://android.googlesource.com/platform/hardware/libhardware_legacy/+/android-4.3_r3/uevent/uevent.c

so if we filter those VSYNC events on the "udev" source, systemd-udev
& upstart & et al user space shouldn't be spammed with those and the
driver will still work.

Regards,

Dmitrijs.

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https://bugs.launchpad.net/bugs/1234743

Title:
  omapfb module floods system with udev events on samsung galaxy nexus

Status in Upstart:
  New
Status in “linux” package in Ubuntu:
  Incomplete
Status in “powerd” package in Ubuntu:
  Fix Released

Bug description:
  Playing an mp4 on a Samsung Galaxy Nexus using today's image (3 Oct
  2013) for 30 minutes I observed that init is busy and also consuming
  heap quite rapidly.

  Attached is the output from running health-check (found in PPA:colin-
  king/white) on init pid 1114.

  Key points:

  1. messages being read/written at ~600 messages a second, hence the high context switch rate and ~4.9% CPU load. 
  2. heap consumption: ~30K a second using brk() and 2K a second via mmap

  To reproduce:

  Install health-check:

  sudo add-apt-repository ppa:colin-king/white
  sudo apt-get update && sudo apt-get install health-check

  Download a large mp4 to the phone. Keep screen from blanking using:

  sudo powerd-cli display on bright &

  then play the mp4:

  dbus-launch mediaplayer-app test.mp4
  --desktop_file_hint=/usr/share/applications/mediaplayer-app.desktop
  --stage_hint=main_stage

  And then observe that init is busy for 300 seconds:

  ps -e | grep init
      1 ?        00:02:56 init
    348 ?        00:00:00 init
   1114 ?        00:03:22 init

  sudo health-check -p 1114 -d 300

  Attached are my results for a 30 minute run.

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