The patch titled
Subject: mm: reduce deferred struct page init ifdeffery
has been added to the -mm mm-unstable branch. Its filename is
mm-reduce-deferred-struct-page-init-ifdeffery.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-reduce-deferred-struct-page-init-ifdeffery.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: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: mm: reduce deferred struct page init ifdeffery
Date: Fri, 9 Aug 2024 14:48:48 +0300
Patch series "mm: Fix several issues with unaccepted memory", v2.
The patchset addresses several issues related to unaccepted memory.
Pacth 1/7 preparatory cleanup.
Patch 2/7 ensures that __alloc_pages_bulk() will not exhaust all
accepted memory without accepting more.
Patches 3/7-5/7 are preparations for patch 6/7, which fixes
alloc_config_page() on machines with unaccepted memory. This allows, for
example, the allocation of gigantic pages at runtime.
Patch 7/7 enables the kernel to accept memory up to the promo watermark.
This patch (of 7):
Add dummy _deferred_grow_zone() for !DEFERRED_STRUCT_PAGE_INIT and remove
#ifdefs in two places.
No functional changes.
Link: https://lkml.kernel.org/r/20240809114854.3745464-1-kirill.shutemov@xxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20240809114854.3745464-3-kirill.shutemov@xxxxxxxxxxxxxxx
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Suggested-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/mm/page_alloc.c~mm-reduce-deferred-struct-page-init-ifdeffery
+++ a/mm/page_alloc.c
@@ -322,6 +322,11 @@ static inline bool deferred_pages_enable
{
return false;
}
+
+static inline bool _deferred_grow_zone(struct zone *zone, unsigned int order)
+{
+ return false;
+}
#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
/* Return a pointer to the bitmap storing bits affecting a block of pages */
@@ -3395,7 +3400,6 @@ check_alloc_wmark:
if (cond_accept_memory(zone, order))
goto try_this_zone;
-#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
/*
* Watermark failed for this zone, but see if we can
* grow this zone if it contains deferred pages.
@@ -3404,7 +3408,6 @@ check_alloc_wmark:
if (_deferred_grow_zone(zone, order))
goto try_this_zone;
}
-#endif
/* Checked here to keep the fast path fast */
BUILD_BUG_ON(ALLOC_NO_WATERMARKS < NR_WMARK);
if (alloc_flags & ALLOC_NO_WATERMARKS)
@@ -3450,13 +3453,11 @@ try_this_zone:
if (cond_accept_memory(zone, order))
goto try_this_zone;
-#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
/* Try again if zone has deferred pages */
if (deferred_pages_enabled()) {
if (_deferred_grow_zone(zone, order))
goto try_this_zone;
}
-#endif
}
}
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
mm-fix-endless-reclaim-on-machines-with-unaccepted-memory.patch
mm-reduce-deferred-struct-page-init-ifdeffery.patch
mm-accept-memory-in-__alloc_pages_bulk.patch
mm-introduce-pageunaccepted-page-type.patch
mm-rework-accept-memory-helpers.patch
mm-add-a-helper-to-accept-page.patch
mm-page_isolation-handle-unaccepted-memory-isolation.patch
mm-accept-to-promo-watermark.patch
