On Thu, Jul 6, 2017 at 10:56 AM, Lars Kellogg-Stedman <l...@redhat.com> wrote:
> In older versions of systemd one could handle this using the directives > described in https://www.freedesktop.org/wiki/Software/systemd/ > MyServiceCantGetRealtime/, but unfortunately that document, despite being > the number 1 search result for pretty much anything involving "systemd" and > "realtime", is obsolete and those directives no longer exist. > > Is there a way to make this work correctly with modern versions of > systemd? I've hacked around it for now by creating > /etc/systemd/system/myservice.service.d/realtime.conf that moves the > service back to the root cgroup and then uses chrt to set the scheduling > policy: > It looks like systemd sets up cgroups before calling ExecStartPre, which means I can emulate the behavior of those obsolete directives by running: ExecStartPre=/bin/sh -c 'echo 550000 > /sys/fs/cgroup/cpu,cpuacct/cpu.rt_runtime_us' ExecStartPre=/bin/sh -c 'echo 200000 > /sys/fs/cgroup/cpu,cpuacct/system.slice/cpu.rt_runtime_us' ExecStartPre=/bin/sh -c 'echo 200000 > /sys/fs/cgroup/cpu,cpuacct/system.slice/myservice.service/cpu.rt_runtime_us' In an environment where CONFIG_RT_GROUP_SCHED is set, is this the best way of addressing the problem? -- Lars Kellogg-Stedman <l...@redhat.com>
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