From: Sarthak Sharma <sarthak.sharma@arm.com>
To: "Gregory Price (Meta)" <gourry@gourry.net>,
linux-kselftest@vger.kernel.org, linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com,
akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org,
liam@infradead.org, vbabka@kernel.org, rppt@kernel.org,
surenb@google.com, mhocko@suse.com, shuah@kernel.org
Subject: Re: [PATCH 5/8] selftests/mm: check that MADV_COLD and MADV_PAGEOUT preserve shared memory
Date: Mon, 19 Oct 2026 10:43:14 +0530 [thread overview]
Message-ID: <d67a7c38-5f35-47db-8ddd-e84e01f63388@arm.com> (raw)
In-Reply-To: <20261014175756.2035176-6-gourry@gourry.net>
On 10/14/26 11:27 PM, Gregory Price (Meta) wrote:
> Both hints are non-destructive, but the tests so far only check that for
> private anonymous memory. Shared memory reaches reclaim through different
> paths: a dirty shared file page must be written back or left resident,
> shared anonymous memory is paged out through shmem, and a SHM_LOCK'd
> segment is unevictable without its VMA being VM_LOCKED.
>
> Check that MADV_COLD and MADV_PAGEOUT preserve a dirty shared file page,
> that MADV_PAGEOUT preserves a shared anonymous page, and that it leaves a
> SHM_LOCK'd page resident. The SHM_LOCK test needs root to confirm through
> /proc/kpageflags that the page is unevictable, and skips if it is not.
>
> Signed-off-by: Gregory Price (Meta) <gourry@gourry.net>
> ---
> tools/testing/selftests/mm/madvise.c | 138 +++++++++++++++++++++++++++
> tools/testing/selftests/mm/vm_util.h | 1 +
> 2 files changed, 139 insertions(+)
LGTM
Reviewed-by: Sarthak Sharma <sarthak.sharma@arm.com>
next prev parent reply other threads:[~2026-10-19 5:13 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-14 17:57 [PATCH 0/8] selftests/mm: add MADV_COLD and MADV_PAGEOUT contract tests Gregory Price (Meta)
2026-10-14 17:57 ` [PATCH 1/8] " Gregory Price (Meta)
2026-10-19 4:59 ` Sarthak Sharma
2026-10-14 17:57 ` [PATCH 2/8] selftests/mm: check that MADV_PAGEOUT skips holes and swapped pages Gregory Price (Meta)
2026-10-19 5:00 ` Sarthak Sharma
2026-10-14 17:57 ` [PATCH 3/8] selftests/mm: check MADV_COLD and MADV_PAGEOUT range handling Gregory Price (Meta)
2026-10-14 21:31 ` [PATCH] fixup! " Gregory Price (Meta)
2026-10-16 12:17 ` [PATCH 3/8] " Sarthak Sharma
2026-10-16 13:22 ` Gregory Price
2026-10-16 14:07 ` Gregory Price
2026-10-19 4:48 ` Sarthak Sharma
2026-10-14 17:57 ` [PATCH 4/8] selftests/mm: check that MADV_COLD and MADV_PAGEOUT reject hugetlb Gregory Price (Meta)
2026-10-19 5:02 ` Sarthak Sharma
2026-10-14 17:57 ` [PATCH 5/8] selftests/mm: check that MADV_COLD and MADV_PAGEOUT preserve shared memory Gregory Price (Meta)
2026-10-19 5:13 ` Sarthak Sharma [this message]
2026-10-14 17:57 ` [PATCH 6/8] selftests/mm: check MADV_COLD and MADV_PAGEOUT on partly advised THPs Gregory Price (Meta)
2026-10-19 5:16 ` Sarthak Sharma
2026-10-14 17:57 ` [PATCH 7/8] selftests/mm: check MADV_PAGEOUT file permissions Gregory Price (Meta)
2026-10-16 12:18 ` Sarthak Sharma
2026-10-16 13:48 ` Gregory Price
2026-10-19 4:51 ` Sarthak Sharma
2026-10-14 17:57 ` [PATCH 8/8] selftests/mm: check that unauthorized MADV_PAGEOUT skips large file folios Gregory Price (Meta)
2026-10-14 21:26 ` Gregory Price
2026-10-19 5:19 ` Sarthak Sharma
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