From: Sarthak Sharma <sarthak.sharma@arm.com>
To: "Gregory Price (Meta)" <gourry@gourry.net>,
linux-kselftest@vger.kernel.org
Cc: linux-mm@kvack.org, 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 v3 4/7] selftests/mm: check that MADV_COLD and MADV_PAGEOUT preserve shared memory
Date: Wed, 28 Oct 2026 16:54:12 +0530 [thread overview]
Message-ID: <f3e0403f-07cf-49be-acb9-671a1467d1cd@arm.com> (raw)
In-Reply-To: <20261019171206.3331374-5-gourry@gourry.net>
On 10/19/26 10:42 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 differently:
>
> Test the following:
> - a dirty shared file page must be written back or left resident,
> - shared anonymous memory is paged out through shmem
> - a SHM_LOCK'd segment is unevictable without its VMA being VM_LOCKED.
>
> MADV_PAGEOUT unmaps a shmem page before it tries to swap it out
> so none of these needs swap.
>
> The SHM_LOCK test confirms the page is unevictable and skips otherwise.
>
> Signed-off-by: Gregory Price (Meta) <gourry@gourry.net>
> ---
> v3: Dropped Sarthak's Reviewed-by from v2 5/8: added the fixture check
> for hidden PFNs and create_temp_file(), and the shared anonymous
> test now fails rather than skips when the page is not unmapped.
LGTM, so:
Reviewed-by: Sarthak Sharma <sarthak.sharma@arm.com>
next prev parent reply other threads:[~2026-10-28 11:24 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-19 17:11 [PATCH v3 0/7] selftests/mm: add MADV_COLD and MADV_PAGEOUT contract tests Gregory Price (Meta)
2026-10-19 17:12 ` [PATCH v3 1/7] " Gregory Price (Meta)
2026-10-28 11:22 ` Sarthak Sharma
2026-10-28 13:43 ` Gregory Price (Meta)
2026-10-19 17:12 ` [PATCH v3 2/7] selftests/mm: check MADV_COLD and MADV_PAGEOUT range handling Gregory Price (Meta)
2026-10-28 11:23 ` Sarthak Sharma
2026-10-19 17:12 ` [PATCH v3 3/7] selftests/mm: check that MADV_COLD and MADV_PAGEOUT reject hugetlb Gregory Price (Meta)
2026-10-19 17:12 ` [PATCH v3 4/7] selftests/mm: check that MADV_COLD and MADV_PAGEOUT preserve shared memory Gregory Price (Meta)
2026-10-28 11:24 ` Sarthak Sharma [this message]
2026-10-19 17:12 ` [PATCH v3 5/7] selftests/mm: check MADV_COLD and MADV_PAGEOUT on partly advised THPs Gregory Price (Meta)
2026-10-19 17:12 ` [PATCH v3 6/7] selftests/mm: check MADV_PAGEOUT file permissions Gregory Price (Meta)
2026-10-28 11:25 ` Sarthak Sharma
2026-10-19 17:12 ` [PATCH v3 7/7] selftests/mm: check that unauthorized MADV_PAGEOUT skips large file folios Gregory Price (Meta)
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