Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Catalin Marinas <catalin.marinas@arm.com>
To:     Baolin Wang <baolin.wang@linux.alibaba.com>, will@kernel.org
Cc:     christophe.leroy@csgroup.eu, anshuman.khandual@arm.com,
        akpm@linux-foundation.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        mike.kravetz@oracle.com, willy@infradead.org,
        songmuchun@bytedance.com
Subject: Re: [PATCH v3 0/2] Implement arm64 specific huge_ptep_get()
Date:   Mon, 16 May 2022 23:53:15 +0100
Message-Id: <165274157825.4033361.18236433604256004496.b4-ty@arm.com>
In-Reply-To: <cover.1652496622.git.baolin.wang@linux.alibaba.com>
References: <cover.1652496622.git.baolin.wang@linux.alibaba.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit
Precedence: bulk

On Mon, 16 May 2022 08:55:56 +0800, Baolin Wang wrote:
> As Mike pointed out [1], the huge_ptep_get() will only return one specific
> pte value for the CONT-PTE or CONT-PMD size hugetlb on ARM64 system, which
> will not take into account the subpages' dirty or young bits of a CONT-PTE/PMD
> size hugetlb page. That will make us miss dirty or young flags of a CONT-PTE/PMD
> size hugetlb page for those functions that want to check the dirty or
> young flags of a hugetlb page. For example, the gather_hugetlb_stats() will
> get inaccurate dirty hugetlb page statistics, and the DAMON for hugetlb monitoring
> will also get inaccurate access statistics.
> 
> [...]

Applied to arm64 (for-next/misc), thanks!

[1/2] arm64/hugetlb: Use ptep_get() to get the pte value of a huge page
      https://git.kernel.org/arm64/c/f0d9d79ec793
[2/2] arm64/hugetlb: Implement arm64 specific huge_ptep_get()
      https://git.kernel.org/arm64/c/bc5dfb4fd7bd

-- 
Catalin