The patch titled
Subject: mm: memcontrol: clarify swapaccount=0 deprecation warning
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-memcontrol-clarify-swapaccount=0-deprecation-warning.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memcontrol-clarify-swapaccount=0-deprecation-warning.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: memcontrol: clarify swapaccount=0 deprecation warning
Date: Tue, 13 Feb 2024 03:16:34 -0500
The swapaccount deprecation warning is throwing false positives. Since we
deprecated the knob and defaulted to enabling, the only reports we've been
getting are from folks that set swapaccount=1. While this is a nice
affirmation that always-enabling was the right choice, we certainly don't
want to warn when users request the supported mode.
Only warn when disabling is requested, and clarify the warning.
Link: https://lkml.kernel.org/r/20240213081634.3652326-1-hannes@xxxxxxxxxxx
Fixes: b25806dcd3d5 ("mm: memcontrol: deprecate swapaccounting=0 mode")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: "Jonas Schäfer" <jonas@xxxxxxxxxxxxx>
Reported-by: Narcis Garcia <debianlists@xxxxxxxxx>
Suggested-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Reviewed-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
--- a/mm/memcontrol.c~mm-memcontrol-clarify-swapaccount=0-deprecation-warning
+++ a/mm/memcontrol.c
@@ -7971,9 +7971,13 @@ bool mem_cgroup_swap_full(struct folio *
static int __init setup_swap_account(char *s)
{
- pr_warn_once("The swapaccount= commandline option is deprecated. "
- "Please report your usecase to linux-mm@xxxxxxxxx if you "
- "depend on this functionality.\n");
+ bool res;
+
+ if (!kstrtobool(s, &res) && !res)
+ pr_warn_once("The swapaccount=0 commdandline option is deprecated "
+ "in favor of configuring swap control via cgroupfs. "
+ "Please report your usecase to linux-mm@xxxxxxxxx if you "
+ "depend on this functionality.\n");
return 1;
}
__setup("swapaccount=", setup_swap_account);
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
mm-memcontrol-clarify-swapaccount=0-deprecation-warning.patch
mm-zswap-rename-zswap_free_entry-to-zswap_entry_free.patch
mm-zswap-inline-and-remove-zswap_entry_find_get.patch
mm-zswap-move-zswap_invalidate_entry-to-related-functions.patch
mm-zswap-warn-when-referencing-a-dead-entry.patch
mm-zswap-clean-up-zswap_entry_put.patch
mm-zswap-rename-__zswap_load-to-zswap_decompress.patch
mm-zswap-break-out-zwap_compress.patch
mm-zswap-further-cleanup-zswap_store.patch
mm-zswap-simplify-zswap_invalidate.patch
mm-zswap-function-ordering-pool-alloc-free.patch
mm-zswap-function-ordering-pool-refcounting.patch
mm-zswap-function-ordering-zswap_pools.patch
mm-zswap-function-ordering-pool-params.patch
mm-zswap-function-ordering-public-lru-api.patch
mm-zswap-function-ordering-move-entry-sections-out-of-lru-section.patch
mm-zswap-function-ordering-move-entry-section-out-of-tree-section.patch
mm-zswap-function-ordering-compress-decompress-functions.patch
mm-zswap-function-ordering-per-cpu-compression-infra.patch
mm-zswap-function-ordering-writeback.patch
mm-zswap-function-ordering-shrink_memcg_cb.patch
