linux-kernel - [PATCH v2 0/3] Optimizations for khugepaged

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Message-Id: <20250625055806.82645-1-dev.jain@arm.com>
Date: Wed, 25 Jun 2025 11:28:03 +0530
From: Dev Jain <dev.jain@....com>
To: akpm@...ux-foundation.org,
	david@...hat.com
Cc: ziy@...dia.com,
	baolin.wang@...ux.alibaba.com,
	lorenzo.stoakes@...cle.com,
	Liam.Howlett@...cle.com,
	npache@...hat.com,
	ryan.roberts@....com,
	baohua@...nel.org,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Dev Jain <dev.jain@....com>
Subject: [PATCH v2 0/3] Optimizations for khugepaged

This patch series uses PTE batching to optimize two functions, and
also addresses a race condition.

---
@David I did not make the clear_full_ptes clean up since that will require
some more work than I originally thought :)

v1->v2:
 - Use for loop instead of do-while loop (Lorenzo)
 - Remove folio_test_large check since the subpage-check condition
   will imply that (Baolin)
 - Combine patch 1 and 2 into this series, add new patch 3

Dev Jain (3):
  khugepaged: Optimize __collapse_huge_page_copy_succeeded() by PTE
    batching
  khugepaged: Optimize collapse_pte_mapped_thp() for large folios by PTE
    batching
  khugepaged: Reduce race probability between migration and khugepaged

 mm/khugepaged.c | 77 ++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 57 insertions(+), 20 deletions(-)

-- 
2.30.2