The patch titled
Subject: mm/page_alloc.c: allow __GFP_NOFAIL requests deeper access to reserves
has been added to the -mm mm-unstable branch. Its filename is
mm-page_allocc-allow-__gfp_nofail-requests-deeper-access-to-reserves.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_allocc-allow-__gfp_nofail-requests-deeper-access-to-reserves.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Subject: mm/page_alloc.c: allow __GFP_NOFAIL requests deeper access to reserves
Date: Mon, 9 Jan 2023 15:16:29 +0000
Currently __GFP_NOFAIL allocations without any other flags can access 25%
of the reserves but these requests imply that the system cannot make
forward progress until the allocation succeeds. Allow __GFP_NOFAIL access
to 75% of the min reserve.
Link: https://lkml.kernel.org/r/20230109151631.24923-6-mgorman@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: NeilBrown <neilb@xxxxxxx>
Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/page_alloc.c~mm-page_allocc-allow-__gfp_nofail-requests-deeper-access-to-reserves
+++ a/mm/page_alloc.c
@@ -5323,7 +5323,7 @@ nopage:
* could deplete whole memory reserves which would just make
* the situation worse
*/
- page = __alloc_pages_cpuset_fallback(gfp_mask, order, ALLOC_HARDER, ac);
+ page = __alloc_pages_cpuset_fallback(gfp_mask, order, ALLOC_MIN_RESERVE|ALLOC_HARDER, ac);
if (page)
goto got_pg;
_
Patches currently in -mm which might be from mgorman@xxxxxxxxxxxxxxxxxxx are
mm-page_alloc-rename-alloc_high-to-alloc_min_reserve.patch
mm-page_alloc-treat-rt-tasks-similar-to-__gfp_high.patch
mm-page_alloc-explicitly-record-high-order-atomic-allocations-in-alloc_flags.patch
mm-page_alloc-explicitly-define-what-alloc-flags-deplete-min-reserves.patch
mm-page_allocc-allow-__gfp_nofail-requests-deeper-access-to-reserves.patch
mm-page_alloc-give-gfp_atomic-and-non-blocking-allocations-access-to-reserves.patch
