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mm: gfp_types: fix __GFP_ACCOUNT, GFP_KERNEL_ACCOUNT documentation

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Gregory points out that these descriptions are cursed and confusing,
considering what these flags actually do.  This is mostly due to historic
implementation choices and cgroup1 baggage.  Improve the description of
their actual effects.

Link: https://lore.kernel.org/20260701182102.1586784-1-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reported-by: Gregory Price <gourry@gourry.net>
Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Gregory Price <gourry@gourry.net>
Acked-by: SJ Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Johannes Weiner
2026-07-01 14:21:02 -04:00
committed by Andrew Morton
parent 5491b25d4a
commit f6c786a95e
1 changed files with 3 additions and 2 deletions
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5
include/linux/gfp_types.h
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@@ -136,7 +136,8 @@ enum {
* %__GFP_THISNODE forces the allocation to be satisfied from the requested
* node with no fallbacks or placement policy enforcements.
*
* %__GFP_ACCOUNT causes the allocation to be accounted to kmemcg.
* %__GFP_ACCOUNT causes the allocation to be accounted to the active
* cgroup context.
*
* %__GFP_NO_OBJ_EXT causes slab allocation to have no object extension.
* mark_obj_codetag_empty() should be called upon freeing for objects allocated
@@ -320,7 +321,7 @@ enum {
* %ZONE_NORMAL or a lower zone for direct access but can direct reclaim.
*
* %GFP_KERNEL_ACCOUNT is the same as GFP_KERNEL, except the allocation is
* accounted to kmemcg.
* accounted to the active cgroup context.
*
* %GFP_NOWAIT is for kernel allocations that should not stall for direct
* reclaim, start physical IO or use any filesystem callback. It is very