linux-kernel - Re: [PATCH V3] selftests: vm: Add test for Soft-Dirty PTE bit

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Date:   Mon, 28 Feb 2022 10:37:46 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>
Cc:     kernel@...labora.com, kernelci@...ups.io,
        Will Deacon <will@...nel.org>,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH V3] selftests: vm: Add test for Soft-Dirty PTE bit

On 24.02.22 22:23, Muhammad Usama Anjum wrote:
> This introduces three tests:
> 1) Sanity check soft dirty basic semantics: allocate area, clean, dirty,
> check if the SD bit flipped.
> 2) Check VMA reuse: validate the VM_SOFTDIRTY usage
> 3) Check soft-dirty on huge pages
> 
> This was motivated by Will Deacon's fix commit 912efa17e512 ("mm: proc:
> Invalidate TLB after clearing soft-dirty page state"). I was tracking the
> same issue that he fixed, and this test would have caught it.
> 

A note that madv_populate.c already contains some SOFTDIRTY tests
regarding MADV_POPULATE. Eventually we want to factor out
softdirty/pagemap handling+checks for easier reuse.


-- 
Thanks,

David / dhildenb