linux-kernel - [PATCH v2 0/2] Compute contiguous empty PTEs for mTHP efficiently

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20240916110754.1236200-1-dev.jain@arm.com>
Date: Mon, 16 Sep 2024 16:37:52 +0530
From: Dev Jain <dev.jain@....com>
To: akpm@...ux-foundation.org,
	david@...hat.com,
	willy@...radead.org
Cc: ryan.roberts@....com,
	anshuman.khandual@....com,
	baohua@...nel.org,
	hughd@...gle.com,
	ioworker0@...il.com,
	wangkefeng.wang@...wei.com,
	baolin.wang@...ux.alibaba.com,
	gshan@...hat.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Dev Jain <dev.jain@....com>
Subject: [PATCH v2 0/2] Compute contiguous empty PTEs for mTHP efficiently

We use pte_range_none() to determine whether contiguous PTEs are empty
for an mTHP allocation. Instead of iterating the while loop for every
order, use some information from the previous iteration to eliminate
some cases.

v1->v2:
 - Break into two patches

v1: https://lore.kernel.org/all/20240913091902.1160520-1-dev.jain@arm.com/

Dev Jain (2):
  mm: Make pte_range_none() return number of empty PTEs
  mm: Compute first_set_pte to eliminate evaluating redundant ranges

 mm/memory.c | 30 +++++++++++++++++++++++-------
 1 file changed, 23 insertions(+), 7 deletions(-)

-- 
2.30.2