linux-kernel - [PATCH 2/8] mm: Accept memory in __alloc_pages

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Message-ID: <20240805145940.2911011-3-kirill.shutemov@linux.intel.com>
Date: Mon,  5 Aug 2024 17:59:34 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	"Borislav Petkov (AMD)" <bp@...en8.de>,
	Mel Gorman <mgorman@...e.de>,
	Vlastimil Babka <vbabka@...e.cz>
Cc: Tom Lendacky <thomas.lendacky@....com>,
	Mike Rapoport <rppt@...nel.org>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	David Hildenbrand <david@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 2/8] mm: Accept memory in __alloc_pages_bulk().

Currently, the kernel only accepts memory in get_page_from_freelist(),
but there is another path that directly takes pages from free lists -
__alloc_page_bulk(). This function can consume all accepted memory and
will resort to __alloc_pages_noprof() if necessary.

Conditionally accepted in __alloc_pages_bulk().

The same issue may arise due to deferred page initialization. Kick the
deferred initialization machinery before abandoning the zone, as the
kernel does in get_page_from_freelist().

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 mm/page_alloc.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index aa9b1eaa638c..90a1f01d5996 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4576,12 +4576,25 @@ unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid,
 			goto failed;
 		}
 
+		cond_accept_memory(zone, 0);
+retry_this_zone:
 		mark = wmark_pages(zone, alloc_flags & ALLOC_WMARK_MASK) + nr_pages;
 		if (zone_watermark_fast(zone, 0,  mark,
 				zonelist_zone_idx(ac.preferred_zoneref),
 				alloc_flags, gfp)) {
 			break;
 		}
+
+		if (cond_accept_memory(zone, 0))
+			goto retry_this_zone;
+
+#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
+		/* Try again if zone has deferred pages */
+		if (deferred_pages_enabled()) {
+			if (_deferred_grow_zone(zone, 0))
+				goto retry_this_zone;
+		}
+#endif
 	}
 
 	/*
-- 
2.43.0