From d17ff438a0366f9dcd764ea94c54837873f30724 Mon Sep 17 00:00:00 2001 From: Vratislav Bendel Date: Mon, 29 Aug 2022 14:46:38 +0200 Subject: [PATCH] docs: mm: fix vm overcommit documentation for OVERCOMMIT_GUESS Commit 8c7829b04c52 "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 Signed-off-by: Vratislav Bendel Acked-by: Mike Rapoport Signed-off-by: Jonathan Corbet Link: https://lore.kernel.org/r/20220829124638.63748-1-vbendel@redhat.com --- Documentation/admin-guide/sysctl/vm.rst | 4 ++-- Documentation/mm/overcommit-accounting.rst | 3 +-- 2 files changed, 3 insertions(+), 4 deletions(-) diff --git a/Documentation/admin-guide/sysctl/vm.rst b/Documentation/admin-guide/sysctl/vm.rst index 45ba1f4dc004..c59889de122b 100644 --- a/Documentation/admin-guide/sysctl/vm.rst +++ b/Documentation/admin-guide/sysctl/vm.rst @@ -742,8 +742,8 @@ overcommit_memory This value contains a flag that enables memory overcommitment. -When this flag is 0, the kernel attempts to estimate the amount -of free memory left when userspace requests more memory. +When this flag is 0, the kernel compares the userspace memory request +size against total memory plus swap and rejects obvious overcommits. When this flag is 1, the kernel pretends there is always enough memory until it actually runs out. diff --git a/Documentation/mm/overcommit-accounting.rst b/Documentation/mm/overcommit-accounting.rst index a4895d6fc1c2..e2263477f6d5 100644 --- a/Documentation/mm/overcommit-accounting.rst +++ b/Documentation/mm/overcommit-accounting.rst @@ -8,8 +8,7 @@ The Linux kernel supports the following overcommit handling modes Heuristic overcommit handling. Obvious overcommits of address space are refused. Used for a typical system. It ensures a seriously wild allocation fails while allowing overcommit to - reduce swap usage. root is allowed to allocate slightly more - memory in this mode. This is the default. + reduce swap usage. This is the default. 1 Always overcommit. Appropriate for some scientific