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| author | Brian Masney <bmasney@redhat.com> | 2026-05-28 09:45:10 -0400 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-05-28 21:32:05 -0700 |
| commit | 404fb4f38e8f38469dfff4df0205c9d18eeb1f57 (patch) | |
| tree | 78752ed239444a5a1ca8417affd515db1176c83a /Documentation | |
| parent | cae28ae57e3fa559ec994262974d8b285d4d0174 (diff) | |
| download | linux-next-history-404fb4f38e8f38469dfff4df0205c9d18eeb1f57.tar.gz | |
docs: mm: clarify that user_reserve_kbytes has no effect when overcommit_memory is set to 0 or 1
Looking at __vm_enough_memory() in mm/util.c, user_reserve_kbytes has no
effect when overcommit_memory is set to 0 or 1. The documentation for
overcommit_memory already references user_reserve_kbytes when the flag
is set to 2.
Let's go ahead and add a clarification to user_reserve_kbytes in vm.rst
that it has no effect when overcommit_memory is set to 0 or 1.
Link: https://lore.kernel.org/20260528-mm-clarify-docs-v1-1-aa88e83b4bfd@redhat.com
Signed-off-by: Brian Masney <bmasney@redhat.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/sysctl/vm.rst | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/admin-guide/sysctl/vm.rst b/Documentation/admin-guide/sysctl/vm.rst index 97e12359775c9..b9b0c218bfb44 100644 --- a/Documentation/admin-guide/sysctl/vm.rst +++ b/Documentation/admin-guide/sysctl/vm.rst @@ -1034,6 +1034,8 @@ min(3% of current process size, user_reserve_kbytes) of free memory. This is intended to prevent a user from starting a single memory hogging process, such that they cannot recover (kill the hog). +This setting has no effect when overcommit_memory is set to 0 or 1. + user_reserve_kbytes defaults to min(3% of the current process size, 128MB). If this is reduced to zero, then the user will be allowed to allocate |