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Documentation: x86: convert x86_64/fake-numa-for-cpusets to reST

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This converts the plain text documentation to reStructuredText format and
add it to Sphinx TOC tree. No essential content change.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Changbin Du 2019-05-08 23:21:39 +08:00 committed by Jonathan Corbet
parent 85a3bd41cd
commit f0339db776
2 changed files with 19 additions and 7 deletions
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25
Documentation/x86/x86_64/fake-numa-for-cpusets → Documentation/x86/x86_64/fake-numa-for-cpusets.rst
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@ -1,5 +1,12 @@
.. SPDX-License-Identifier: GPL-2.0
=====================
Fake NUMA For CPUSets
=====================
:Author: David Rientjes <rientjes@cs.washington.edu>
Using numa=fake and CPUSets for Resource Management
Written by David Rientjes <rientjes@cs.washington.edu>
This document describes how the numa=fake x86_64 command-line option can be used
in conjunction with cpusets for coarse memory management. Using this feature,
@ -20,7 +27,7 @@ you become more familiar with using this combination for resource control,
you'll determine a better setup to minimize the number of nodes you have to deal
with.
A machine may be split as follows with "numa=fake=4*512," as reported by dmesg:
A machine may be split as follows with "numa=fake=4*512," as reported by dmesg::
Faking node 0 at 0000000000000000-0000000020000000 (512MB)
Faking node 1 at 0000000020000000-0000000040000000 (512MB)
@ -34,7 +41,7 @@ A machine may be split as follows with "numa=fake=4*512," as reported by dmesg:
Now following the instructions for mounting the cpusets filesystem from
Documentation/cgroup-v1/cpusets.txt, you can assign fake nodes (i.e. contiguous memory
address spaces) to individual cpusets:
address spaces) to individual cpusets::
[root@xroads /]# mkdir exampleset
[root@xroads /]# mount -t cpuset none exampleset
@ -47,7 +54,7 @@ Now this cpuset, 'ddset', will only allowed access to fake nodes 0 and 1 for
memory allocations (1G).
You can now assign tasks to these cpusets to limit the memory resources
available to them according to the fake nodes assigned as mems:
available to them according to the fake nodes assigned as mems::
[root@xroads /exampleset/ddset]# echo $$ > tasks
[root@xroads /exampleset/ddset]# dd if=/dev/zero of=tmp bs=1024 count=1G
@ -57,9 +64,13 @@ Notice the difference between the system memory usage as reported by
/proc/meminfo between the restricted cpuset case above and the unrestricted
case (i.e. running the same 'dd' command without assigning it to a fake NUMA
cpuset):
Unrestricted Restricted
MemTotal: 3091900 kB 3091900 kB
MemFree: 42113 kB 1513236 kB
======== ============ ==========
Name Unrestricted Restricted
======== ============ ==========
MemTotal 3091900 kB 3091900 kB
MemFree 42113 kB 1513236 kB
======== ============ ==========
This allows for coarse memory management for the tasks you assign to particular
cpusets. Since cpusets can form a hierarchy, you can create some pretty

1
Documentation/x86/x86_64/index.rst
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@ -11,3 +11,4 @@ x86_64 Support
uefi
mm
5level-paging
fake-numa-for-cpusets