linux-kernel - [PATCH RFC HACKS 07/11] mm/slub: Set __GFP

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Message-ID: <20250313-asi-page-alloc-v1-7-04972e046cea@google.com>
Date: Thu, 13 Mar 2025 18:11:26 +0000
From: Brendan Jackman <jackmanb@...gle.com>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	Andrew Morton <akpm@...ux-foundation.org>, David Rientjes <rientjes@...gle.com>, 
	Vlastimil Babka <vbabka@...e.cz>, David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	Mike Rapoport <rppt@...nel.org>, Junaid Shahid <junaids@...gle.com>, Reiji Watanabe <reijiw@...gle.com>, 
	Patrick Bellasi <derkling@...gle.com>, Brendan Jackman <jackmanb@...gle.com>, 
	Yosry Ahmed <yosry.ahmed@...ux.dev>
Subject: [PATCH RFC HACKS 07/11] mm/slub: Set __GFP_SENSITIVE for reclaimable slabs

It's not currently possible allocate reclaimable, nonsensitive pages.
For the moment, just add __GFP_SENSITIVE.

This will need to be fixed before this can be a [PATCH].

Signed-off-by: Brendan Jackman <jackmanb@...gle.com>
---
 mm/slub.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/slub.c b/mm/slub.c
index 1f50129dcfb3cd1fc76ac9398fa7718cedb42385..132e894e96df20f2e2d69d0b602b4719cdc072f5 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5559,7 +5559,11 @@ static int calculate_sizes(struct kmem_cache_args *args, struct kmem_cache *s)
 		s->allocflags |= GFP_DMA32;
 
 	if (s->flags & SLAB_RECLAIM_ACCOUNT)
-		s->allocflags |= __GFP_RECLAIMABLE;
+		/*
+		 * TODO: Cannot currently allocate reclaimable, nonsensitive
+		 * pages. For the moment, just add __GFP_SENSITIVE.
+		 */
+		s->allocflags |= __GFP_RECLAIMABLE | __GFP_SENSITIVE;
 
 	/*
 	 * Determine the number of objects per slab

-- 
2.49.0.rc1.451.g8f38331e32-goog