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h=From:To:Cc:Subject:Date:From; b=Exg2M7721p0tBdyqCgso9KybEzTA8oAxesZ4mf2UMIhbm0gl3yHm2Kl6DkVg3/+Yb ox7M1f3Qz20fiOdNkTNlcL836gk8nUUtcKgWeB3JF/aucbc7utDkpX5SwT2Xo3Vheb WD+VyxUy/vBf6B1lbYUoDf6lQJzVgmVHyjf9c38E= From: Dev Jain To: akpm@linux-foundation.org, vbabka@kernel.org, harry@kernel.org, ryabinin.a.a@gmail.com Cc: Dev Jain , surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, hao.li@linux.dev, cl@gentwo.org, rientjes@google.com, roman.gushchin@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, kasan-dev@googlegroups.com, ryan.roberts@arm.com, anshuman.khandual@arm.com, catalin.marinas@arm.com Subject: [PATCH 0/3] kasan: hw_tags: some micro-optimizations Date: Wed, 13 May 2026 16:27:31 +0530 Message-Id: <20260513105734.3380544-1-dev.jain@arm.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 63662180007 X-Rspam-User: X-Stat-Signature: 7tgo1rzbid3diga4t6cdcjuzjanukszi X-HE-Tag: 1778669878-104734 X-HE-Meta: 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 TD/kjw6F wo1mX+YsUN1qJnOVbr+AWkpkycgPZ6nQJM9hemSB3leUYegCNwpBDYjMutSda2DD5tNGPRMMCwtaeKXycAFx6QoZC/cHL8MTezU/gxWeFesl9hrMYw8QfgQ46Nj59in9lomvRP8ZdZytu8ukdtubs/PuaVLvCSma+ESXAqNYd29we+8rF57CdCJkG/sWXJDM+vVG4TPkyCq0+AD/kWEBBgjfxZsDsUk0pnaD7igK3oBA9Yz2cwYwP5amMQFOjzxYpGwUm/aYoMo02YHczjxsdQfRRwGR8vRICHhl7MoL3eHCd32Kii5VP3z1a8poxDtrAuWi9B3+5/7PP/98= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Patch 1 uses GFP_SKIP_KASAN to skip unpoisoning of a slab page in the page allocator, since slab allocator itself poisons the slab page immediately. Patch 2 and 3 remove wasted work while poisoning the tail end of the vmalloc/slab allocation. --- Based on 7.1-rc2. Dev Jain (3): mm/slub: hw_tags: skip page-allocator unpoisoning on slab allocation kasan: avoid re-poisoning tag-based kmalloc redzones vmalloc: hw_tags: optimize vmalloc redzoning include/linux/kasan.h | 17 +++++++++---- mm/kasan/common.c | 55 +++++++++++++++++++++++++++++++++---------- mm/kasan/hw_tags.c | 13 ++++++---- mm/page_alloc.c | 2 +- mm/slub.c | 22 ++++++++++++----- 5 files changed, 79 insertions(+), 30 deletions(-) -- 2.43.0