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mm: reduce deferred struct page init ifdeffery

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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@linux.intel.com
Link: https://lkml.kernel.org/r/20240809114854.3745464-3-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Suggested-by: David Hildenbrand <david@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2024-08-09 14:48:48 +03:00 committed by Andrew Morton
parent 727d50a7e0
commit 3a80b8228f
1 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
mm/page_alloc.c
View File

@ -322,6 +322,11 @@ static inline bool deferred_pages_enabled(void)
{
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
}
}