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docs/vm: clarify overcommit amount sysctl behavior

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Documentation/vm/overcommit-accounting.rst says that the overcommit
amount can be set via vm.overcommit_ratio and vm.overcommit_kbytes.

Add a clarification that those only take effect in overcommit handling
mode 2 ("Don't overcommit"), i.e. they do not act as an "additional"
limit that is always enforced.

Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20211211194159.3137362-1-anssi.hannula@iki.fi
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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Anssi Hannula 2021-12-11 21:41:59 +02:00 committed by Jonathan Corbet
parent 0650092605
commit dc10ec9879
1 changed files with 2 additions and 1 deletions
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Documentation/vm/overcommit-accounting.rst
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@ -34,7 +34,8 @@ The Linux kernel supports the following overcommit handling modes
The overcommit policy is set via the sysctl ``vm.overcommit_memory``.
The overcommit amount can be set via ``vm.overcommit_ratio`` (percentage)
or ``vm.overcommit_kbytes`` (absolute value).
or ``vm.overcommit_kbytes`` (absolute value). These only have an effect
when ``vm.overcommit_memory`` is set to 2.
The current overcommit limit and amount committed are viewable in
``/proc/meminfo`` as CommitLimit and Committed_AS respectively.