linux-kernel - Cgroups, burst

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Message-ID: <CACf67ttiCBpmQEmz-MRhfJasCgs4DDLo2geCZ7i=0D2kXcY-ow@mail.gmail.com>
Date:   Thu, 27 Apr 2017 11:13:22 +0200
From:   Kamil Kamiński <kwb.kot@...il.com>
To:     tj@...nel.org, lizefan@...wei.com, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        mingo@...hat.com
Subject: Cgroups, burst

Hey,

Is there an easy way to burst CPU resources with cgroups when needed?
For example I want to restrict 20% of CPU per process and for example
i want to allow process to use 100% of CPU for 30 sec (burst).

I mean i want restrict CPU usage at 20% per process, not per group.
Restrict resources per group I can do this way:

echo 10000 > cpu.cfs.quota_us
echo 50000 > cpu.cfs_period_us

But I want to restrict usage per process, and if there is a
possibility to burst it.

Or maybe is there a function that will indicate when app will consume
all resources? Then I will just switch her PID to another cgroup (that
will have 100% CPU) for 30 seconds and then back to previous cgroup.