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cgroups: add support for CPUs isolation

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Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>
This commit is contained in:
Patrick Bellasi 2016-08-26 16:29:43 +01:00
parent 21d18f8b78
commit 75a086d77a
1 changed files with 35 additions and 0 deletions
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35
devlib/module/cgroups.py
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@ -388,3 +388,38 @@ class CgroupsModule(Module):
'cgroups_tasks_move {} {} {}'.format(srcg, dstg, exclude), 'cgroups_tasks_move {} {} {}'.format(srcg, dstg, exclude),
as_root=True) as_root=True)
def isolate(self, cpus, exclude=[]):
"""
Remove all userspace tasks from specified CPUs.
A list of CPUs can be specified where we do not want userspace tasks
running. This functions creates a sandbox cpuset CGroup where all
user-space tasks and not-pinned kernel-space tasks are moved into.
This should allows to isolate the specified CPUs which will not get
tasks running unless explicitely moved into the isolated group.
:param cpus: the list of CPUs to isolate
:type cpus: list(int)
:return: the (sandbox, isolated) tuple, where:
sandbox is the CGroup of sandboxed CPUs
isolated is the CGroup of isolated CPUs
"""
all_cpus = set(range(self.target.number_of_cpus))
sbox_cpus = list(all_cpus - set(cpus))
isol_cpus = list(all_cpus - set(sbox_cpus))
# Create Sandbox and Isolated cpuset CGroups
cpuset = self.controller('cpuset')
sbox_cg = cpuset.cgroup('/DEVLIB_SBOX')
isol_cg = cpuset.cgroup('/DEVLIB_ISOL')
# Set CPUs for Sandbox and Isolated CGroups
sbox_cg.set(cpus=sbox_cpus, mems=0)
isol_cg.set(cpus=isol_cpus, mems=0)
# Move all currently running tasks to the Sandbox CGroup
cpuset.move_all_tasks_to('/DEVLIB_SBOX', exclude)
return sbox_cg, isol_cg