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From: Kiryl Shutsemau <kirill@shutemov.name>
To: Andrew Morton <akpm@linux-foundation.org>,
	David Hildenbrand <david@kernel.org>,
	Lorenzo Stoakes <ljs@kernel.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	kernel-team@meta.com, Zi Yan <ziy@nvidia.com>,
	Baolin Wang <baolin.wang@linux.alibaba.com>,
	"Liam R . Howlett" <liam@infradead.org>,
	Nico Pache <nico.pache@linux.dev>,
	Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
	Barry Song <baohua@kernel.org>, Lance Yang <lance.yang@linux.dev>,
	Usama Arif <usama.arif@linux.dev>,
	Vlastimil Babka <vbabka@kernel.org>, Jann Horn <jannh@google.com>,
	"Kiryl Shutsemau (Meta)" <kas@kernel.org>
Subject: [PATCH 07/12] mm/collapse: name the per-table scan reset for what it resets
Date: Fri,  4 Sep 2026 16:10:21 +0100	[thread overview]
Message-ID: <ec3d193817dfa5d0e4fa2f31642c066ebfdd3151.1788533997.git.kas@kernel.org> (raw)
In-Reply-To: <cover.1788533997.git.kas@kernel.org>

From: "Kiryl Shutsemau (Meta)" <kas@kernel.org>

collapse_control_init_scan() resets what one scan accumulates: the node
load, the allocation nodemask and the eligible-PTE bitmap.  It runs before
every PTE table a scan is given, not once per control, so its name points
at the wrong thing.

Call it collapse_scan_reset().

Preparation for giving a control a real init and release, run once each
for a whole series of scans.  Two names a word apart would then stand for
two different jobs.

No functional change.

Assisted-by: Claude-Code:claude-opus-5
Signed-off-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
---
 mm/khugepaged.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 22272cfe97e6..511ffb381fe9 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -550,7 +550,7 @@ void __khugepaged_exit(struct mm_struct *mm)
 	}
 }
 
-static void collapse_control_init_scan(struct collapse_control *cc)
+static void collapse_scan_reset(struct collapse_control *cc)
 {
 	memset(cc->node_load, 0, sizeof(cc->node_load));
 	nodes_clear(cc->alloc_nmask);
@@ -1579,7 +1579,7 @@ static enum scan_result collapse_scan_pmd(struct mm_struct *mm,
 		goto out;
 	}
 
-	collapse_control_init_scan(cc);
+	collapse_scan_reset(cc);
 
 	enabled_orders = collapse_possible_orders(vma, vma->vm_flags, tva_flags);
 
@@ -2660,7 +2660,7 @@ static enum scan_result collapse_scan_file(struct mm_struct *mm,
 
 	present = 0;
 	swap = 0;
-	collapse_control_init_scan(cc);
+	collapse_scan_reset(cc);
 	rcu_read_lock();
 	xas_for_each(&xas, folio, start + HPAGE_PMD_NR - 1) {
 		if (xas_retry(&xas, folio))
-- 
2.54.0


  parent reply	other threads:[~2026-09-04 15:10 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-04 15:10 [PATCH 00/12] mm/collapse: separate a collapse from its callers Kiryl Shutsemau
2026-09-04 15:10 ` [PATCH 01/12] mm/khugepaged: drop redundant mm_struct pin in madvise_collapse() Kiryl Shutsemau
2026-09-04 15:58   ` Zi Yan
2026-09-04 15:10 ` [PATCH 02/12] mm/khugepaged: count collapses where khugepaged makes them Kiryl Shutsemau
2026-09-05  2:25   ` Zi Yan
2026-09-04 15:10 ` [PATCH 03/12] mm/khugepaged: rename mthp_present_ptes bitmap to eligible_ptes Kiryl Shutsemau
2026-09-05  2:28   ` Zi Yan
2026-09-04 15:10 ` [PATCH 04/12] mm/collapse: add collapse.h for the collapse interface Kiryl Shutsemau
2026-09-05  2:36   ` Zi Yan
2026-09-04 15:10 ` [PATCH 05/12] mm/collapse: state what a collapse may do in the policy Kiryl Shutsemau
2026-09-05  2:44   ` Zi Yan
2026-09-04 15:10 ` [PATCH 06/12] mm/collapse: drop the collapse_possible() wrapper Kiryl Shutsemau
2026-09-05  2:45   ` Zi Yan
2026-09-04 15:10 ` Kiryl Shutsemau [this message]
2026-09-05 18:05   ` [PATCH 07/12] mm/collapse: name the per-table scan reset for what it resets Zi Yan
2026-09-04 15:10 ` [PATCH 08/12] mm/collapse: separate scanning a PTE table from collapsing it Kiryl Shutsemau
2026-09-04 15:10 ` [PATCH 09/12] mm/collapse: open-code collapse_single_pmd() in its two callers Kiryl Shutsemau
2026-09-04 15:10 ` [PATCH 10/12] mm/collapse: work out the orders a VMA allows once per VMA Kiryl Shutsemau
2026-09-04 15:10 ` [PATCH 11/12] mm/collapse: declare the collapse interface in collapse.h Kiryl Shutsemau
2026-09-04 15:10 ` [PATCH 12/12] mm/collapse: implement MADV_COLLAPSE in madvise.c Kiryl Shutsemau

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