From: Andrew Morton <akpm@linux-foundation.org>
To: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: sj@kernel.org, damon@lists.linux.dev, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm/damon: Validate if the pmd entry is present before accessing
Date: Wed, 17 Aug 2022 09:07:22 -0700 [thread overview]
Message-ID: <20220817090722.3a04da77a280c74cccde6b2c@linux-foundation.org> (raw)
In-Reply-To: <2838b6737bc259cf575ff11fd1c4b7fdb340fa73.1660717122.git.baolin.wang@linux.alibaba.com>
On Wed, 17 Aug 2022 14:21:12 +0800 Baolin Wang <baolin.wang@linux.alibaba.com> wrote:
> The pmd_huge() is used to validate if the pmd entry is mapped by a huge
> page, also including the case of non-present (migration or hwpoisoned)
> pmd entry on arm64 or x86 architectures. Thus we should validate if it
> is present before making the pmd entry old or getting young state,
> otherwise we can not get the correct corresponding page.
>
What are the user-visible runtime effects of this change?
next prev parent reply other threads:[~2022-08-17 16:07 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-17 6:21 [PATCH] mm/damon: Validate if the pmd entry is present before accessing Baolin Wang
2022-08-17 16:07 ` Andrew Morton [this message]
2022-08-17 16:09 ` SeongJae Park
2022-08-18 1:05 ` Baolin Wang
2022-08-18 2:29 ` SeongJae Park
2022-08-18 2:39 ` Baolin Wang
2022-08-18 2:41 ` Muchun Song
2022-08-18 2:57 ` Baolin Wang
2022-08-18 3:39 ` Muchun Song
2022-08-18 5:07 ` Baolin Wang
2022-08-18 5:12 ` Muchun Song
2022-08-18 5:45 ` Baolin Wang
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