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docs: mm: fix vm overcommit documentation for OVERCOMMIT_GUESS 

Commit 8c7829b04c "mm: fix false-positive OVERCOMMIT_GUESS failures"
changed the behavior of the default OVERCOMMIT_GUESS setting.
Reflect the change also in the Documentation, namely files:
    Documentation/admin-guide/sysctl/vm.rst
    Documentation/mm/overcommit-accounting.rst

Reported-by: Jozef Bacik <jobacik@redhat.com>
Signed-off-by: Vratislav Bendel <vbendel@redhat.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20220829124638.63748-1-vbendel@redhat.com
This commit is contained in:
Vratislav Bendel 2022-08-29 14:46:38 +02:00 committed by Jonathan Corbet
parent a3c12cf3a6
commit d17ff438a0
2 changed files with 3 additions and 4 deletions
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4
Documentation/admin-guide/sysctl/vm.rst
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@ -742,8 +742,8 @@ overcommit_memory
This value contains a flag that enables memory overcommitment. This value contains a flag that enables memory overcommitment.
When this flag is 0, the kernel attempts to estimate the amount When this flag is 0, the kernel compares the userspace memory request
of free memory left when userspace requests more memory. size against total memory plus swap and rejects obvious overcommits.
When this flag is 1, the kernel pretends there is always enough When this flag is 1, the kernel pretends there is always enough
memory until it actually runs out. memory until it actually runs out.

3
Documentation/mm/overcommit-accounting.rst
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@ -8,8 +8,7 @@ The Linux kernel supports the following overcommit handling modes
Heuristic overcommit handling. Obvious overcommits of address Heuristic overcommit handling. Obvious overcommits of address
space are refused. Used for a typical system. It ensures a space are refused. Used for a typical system. It ensures a
seriously wild allocation fails while allowing overcommit to seriously wild allocation fails while allowing overcommit to
reduce swap usage. root is allowed to allocate slightly more reduce swap usage. This is the default.
memory in this mode. This is the default.
1 1
Always overcommit. Appropriate for some scientific Always overcommit. Appropriate for some scientific