linux-kernel - Re: [PATCH] selftests/vm: Add tests validating mremap mirror functionality

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Message-ID: <0facab37-cdb3-1670-abc3-f4fdcc2e4e19@osg.samsung.com>
Date:   Wed, 1 Nov 2017 15:35:32 -0600
From:   Shuah Khan <shuahkh@....samsung.com>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     mike.kravetz@...cle.com, mhocko@...nel.org,
        Shuah Khan <shuahkh@....samsung.com>,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH] selftests/vm: Add tests validating mremap mirror
 functionality

On 10/29/2017 09:18 PM, Anshuman Khandual wrote:
> This adds two tests to validate mirror functionality with mremap()
> system call on shared and private anon mappings. After the commit
> dba58d3b8c5 ("mm/mremap: fail map duplication attempts for private
> mappings"), any attempt to mirror private anon mapping will fail.
> 
> Suggested-by: Mike Kravetz <mike.kravetz@...cle.com>
> Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
> Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
> ---
> Changes in V4:
> 
> - Folded these two test files into just one as per Mike
> - Did some renaming of functions, cleans ups etc
> 
> Changes in V3: (https://patchwork.kernel.org/patch/10013469/)
> 
> - Fail any attempts to mirror an existing anon private mapping
> - Updated run_vmtests to include these new mremap tests
> - Updated the commit message
> 
> Changes in V2: (https://patchwork.kernel.org/patch/9861259/)
> 
> - Added a test for private anon mappings
> - Used sysconf(_SC_PAGESIZE) instead of hard coding page size
> - Used MREMAP_MAYMOVE instead of hard coding the flag value 1
> 
> Original V1: (https://patchwork.kernel.org/patch/9854415/)

Thanks. I will queue this up for 4.15-rc1

-- Shuah