From 9ffd83c333bdc7741bfa1a73b3461f1b51208c5f Mon Sep 17 00:00:00 2001 From: Lukas Nykryn Date: Tue, 12 Feb 2019 16:58:16 +0100 Subject: [PATCH] rules: add elevator= kernel command line parameter Kernel removed the elevator= option, so let's reintroduce it for rhel8 via udev rule. RHEL-only Related: #2138081 --- rules.d/40-elevator.rules | 20 ++++++++++++++++++++ rules.d/meson.build | 3 ++- 2 files changed, 22 insertions(+), 1 deletion(-) create mode 100644 rules.d/40-elevator.rules diff --git a/rules.d/40-elevator.rules b/rules.d/40-elevator.rules new file mode 100644 index 0000000000..dbe8fc81a4 --- /dev/null +++ b/rules.d/40-elevator.rules @@ -0,0 +1,20 @@ +# We aren't adding devices skip the elevator check +ACTION!="add", GOTO="sched_out" + +SUBSYSTEM!="block", GOTO="sched_out" +ENV{DEVTYPE}!="disk", GOTO="sched_out" + +# Technically, dm-multipath can be configured to use an I/O scheduler. +# However, there are races between the 'add' uevent and the linking in +# of the queue/scheduler sysfs file. For now, just skip dm- devices. +KERNEL=="dm-*|md*", GOTO="sched_out" + +# Skip bio-based devices, which don't support an I/O scheduler. +ATTR{queue/scheduler}=="none", GOTO="sched_out" + +# If elevator= is specified on the kernel command line, change the +# scheduler to the one specified. +IMPORT{cmdline}="elevator" +ENV{elevator}!="", ATTR{queue/scheduler}="$env{elevator}" + +LABEL="sched_out" \ No newline at end of file diff --git a/rules.d/meson.build b/rules.d/meson.build index 70f48e877b..4e88400d02 100644 --- a/rules.d/meson.build +++ b/rules.d/meson.build @@ -5,7 +5,8 @@ install_data( install_dir : udevrulesdir) rules = [ - [files('40-redhat.rules', + [files('40-elevator.rules', + '40-redhat.rules', '60-autosuspend.rules', '60-block.rules', '60-cdrom_id.rules',