mirror of
https://github.com/systemd/systemd.git
synced 2025-01-03 05:18:09 +03:00
7fd45eec37
This commit add the `-i` option to `udevadm trigger` that force it to match parent devices even if they're excluded from filters. The rationale is that some embedded devices have a huge number of platform devices ( ~ 4k for MX8 ) they are there because they're defined in the device tree but there isn't any action or udev rules associated with them. So at boot a significant time is spend triggering and processing rules for devices that don't produce any effect and we would like to filter them by calling: ``` udevadm trigger --type=device --action=add -s block -s tty ``` instead of the normal ``` udevadm trigger --type=device --action=add ``` so we can use filter to filter out only subsystems for we we know that we have rules in place that do something useful. On the other side action / rules are not triggered until the parent is triggered ( which is part of another subsystem), so the additional option will allows udev to complete the coldplug with only the devices we care. Example on iMX8: .Without the new option ``` root@dev:~# udevadm trigger --dry-run -s block --action=add -v /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0boot0 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0boot1 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p1 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p2 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p3 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p4 ``` .With the new option ``` root@dev:~# udevadm trigger --dry-run -i -s block --action=add -v /sys/devices/platform /sys/devices/platform/bus@5b000000 /sys/devices/platform/bus@5b000000/5b010000.mmc /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0boot0 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0boot1 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p1 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p2 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p3 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p4 ``` Boot time reduction with this is place is ~ 1 second. |
||
|---|---|---|
| .. | ||
| _bootctl | ||
| _busctl | ||
| _coredumpctl | ||
| _hostnamectl | ||
| _journalctl | ||
| _kernel-install | ||
| _localectl | ||
| _loginctl | ||
| _machinectl | ||
| _networkctl | ||
| _oomctl | ||
| _resolvectl | ||
| _run0 | ||
| _sd_hosts_or_user_at_host | ||
| _sd_machines | ||
| _sd_outputmodes | ||
| _sd_unit_files | ||
| _systemctl.in | ||
| _systemd | ||
| _systemd-analyze | ||
| _systemd-delta | ||
| _systemd-inhibit | ||
| _systemd-nspawn | ||
| _systemd-path | ||
| _systemd-run | ||
| _systemd-tmpfiles | ||
| _timedatectl | ||
| _udevadm | ||
| _varlinkctl | ||
| meson.build | ||