linux-kernel - [RFC PATCH 08/16] mm/madvise: pass madvise_behavior struct to madvise_dontneed

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Message-Id: <20250305181611.54484-9-sj@kernel.org>
Date: Wed,  5 Mar 2025 10:16:03 -0800
From: SeongJae Park <sj@...nel.org>
To: 
Cc: SeongJae Park <sj@...nel.org>,
	"Liam R. Howlett" <howlett@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Vlastimil Babka <vbabka@...e.cz>,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH 08/16] mm/madvise: pass madvise_behavior struct to madvise_dontneed_free()

madvise_dontneed_free() can be optimized to batch tlb flushes by
receiving mmu_gather object that initialized and finished outside, and
doing only gathering of tlb entries that need to be flushed into the
received mmu_gather object.  But the function is receiving only one
single behavior integer value.  Update it to receive
'struct madvise_behavior' object so that upcoming tlb flushes batching
optimization can pass the mmu_gather object.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/madvise.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/mm/madvise.c b/mm/madvise.c
index 6fa7dabe5bad..73a4323197e2 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -890,11 +890,16 @@ static bool madvise_dontneed_free_valid_vma(struct vm_area_struct *vma,
 	return true;
 }
 
+struct madvise_behavior {
+	int behavior;
+};
+
 static long madvise_dontneed_free(struct vm_area_struct *vma,
 				  struct vm_area_struct **prev,
 				  unsigned long start, unsigned long end,
-				  int behavior)
+				  struct madvise_behavior *madv_behavior)
 {
+	int behavior = madv_behavior->behavior;
 	struct mm_struct *mm = vma->vm_mm;
 
 	*prev = vma;
@@ -1241,10 +1246,6 @@ static long madvise_guard_remove(struct vm_area_struct *vma,
 			       &guard_remove_walk_ops, NULL);
 }
 
-struct madvise_behavior {
-	int behavior;
-};
-
 /*
  * Apply an madvise behavior to a region of a vma.  madvise_update_vma
  * will handle splitting a vm area into separate areas, each area with its own
@@ -1276,7 +1277,7 @@ static int madvise_vma_behavior(struct vm_area_struct *vma,
 	case MADV_FREE:
 	case MADV_DONTNEED:
 	case MADV_DONTNEED_LOCKED:
-		return madvise_dontneed_free(vma, prev, start, end, behavior);
+		return madvise_dontneed_free(vma, prev, start, end, arg);
 	case MADV_NORMAL:
 		new_flags = new_flags & ~VM_RAND_READ & ~VM_SEQ_READ;
 		break;
-- 
2.39.5