> 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. Note, ideally we would already filter them at the "kernel" netlink source, so that udevd doesn't have to wake up 60 times a second. Filtering them at the "libudev" source would avoid waking up clients, but not udevd itself. However, that requires matching (kernel) properties in the netlink packet with only the rather limited set of instructions from http://www.gsp.com/cgi- bin/man.cgi?section=4&topic=bpf#5 . I'll try that, but if it turns out to be impractical, I'll instead add a hack to at least short-circuit those in udevd, avoid all rules processing, and not forward them to the libudev netlink source. That'll keep the udevd wakeups but at least minimize the resources spent for each one. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1234743 Title: omapfb module floods system with udev events on samsung galaxy nexus Status in Upstart: Fix Released Status in “linux” package in Ubuntu: Invalid Status in “lxc-android-config” package in Ubuntu: In Progress Status in “powerd” package in Ubuntu: Fix Released Status in “systemd” package in Ubuntu: In Progress 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. To manage notifications about this bug go to: https://bugs.launchpad.net/upstart/+bug/1234743/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
