linux-kernel - [PATCH 19/45] fs/proc: Enable gather_pte

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Message-ID: <20240704043132.28501-20-osalvador@suse.de>
Date: Thu,  4 Jul 2024 06:31:06 +0200
From: Oscar Salvador <osalvador@...e.de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Peter Xu <peterx@...hat.com>,
	Muchun Song <muchun.song@...ux.dev>,
	David Hildenbrand <david@...hat.com>,
	SeongJae Park <sj@...nel.org>,
	Miaohe Lin <linmiaohe@...wei.com>,
	Michal Hocko <mhocko@...e.com>,
	Matthew Wilcox <willy@...radead.org>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Oscar Salvador <osalvador@...e.de>
Subject: [PATCH 19/45] fs/proc: Enable gather_pte_stats to handle hugetlb vmas

PMD-mapped hugetlb vmas will also reach gather_pte_stats.
Add the required code so it knows how to handle those there.

Signed-off-by: Oscar Salvador <osalvador@...e.de>
---
 fs/proc/task_mmu.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 3785a44b97fa..e13754d3246e 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -3141,7 +3141,7 @@ static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
 	return page;
 }
 
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#ifdef CONFIG_PGTABLE_HAS_HUGE_LEAVES
 static struct page *can_gather_numa_stats_pmd(pmd_t pmd,
 					      struct vm_area_struct *vma,
 					      unsigned long addr)
@@ -3176,15 +3176,21 @@ static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
 	pte_t *orig_pte;
 	pte_t *pte;
 
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	ptl = pmd_trans_huge_lock(pmd, vma);
+#ifdef CONFIG_PGTABLE_HAS_HUGE_LEAVES
+	ptl = pmd_huge_lock(pmd, vma);
 	if (ptl) {
+		unsigned long nr_pages;
 		struct page *page;
 
+		if (is_vm_hugetlb_page(vma))
+			nr_pages = 1;
+		else
+			nr_pages = HPAGE_PMD_SIZE / PAGE_SIZE;
+
 		page = can_gather_numa_stats_pmd(*pmd, vma, addr);
 		if (page)
 			gather_stats(page, md, pmd_dirty(*pmd),
-				     HPAGE_PMD_SIZE/PAGE_SIZE);
+				     nr_pages);
 		spin_unlock(ptl);
 		return 0;
 	}
-- 
2.26.2