linux-kernel - Re: [PATCH] selftests/mm: Introduce a test program to assess swap entry allocation for thp

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Date: Thu, 20 Jun 2024 15:24:30 +0800
From: "Huang, Ying" <ying.huang@...el.com>
To: David Hildenbrand <david@...hat.com>
Cc: Barry Song <21cnbao@...il.com>,  akpm@...ux-foundation.org,
  shuah@...nel.org,  linux-mm@...ck.org,  ryan.roberts@....com,
  chrisl@...nel.org,  hughd@...gle.com,  kaleshsingh@...gle.com,
  kasong@...cent.com,  linux-kernel@...r.kernel.org,
  linux-kselftest@...r.kernel.org,  Barry Song <v-songbaohua@...o.com>
Subject: Re: [PATCH] selftests/mm: Introduce a test program to assess swap
 entry allocation for thp_swapout

David Hildenbrand <david@...hat.com> writes:

> On 20.06.24 03:53, Huang, Ying wrote:
>> Barry Song <21cnbao@...il.com> writes:
>> 
>>> From: Barry Song <v-songbaohua@...o.com>
>>>
>>> Both Ryan and Chris have been utilizing the small test program to aid
>>> in debugging and identifying issues with swap entry allocation. While
>>> a real or intricate workload might be more suitable for assessing the
>>> correctness and effectiveness of the swap allocation policy, a small
>>> test program presents a simpler means of understanding the problem and
>>> initially verifying the improvements being made.
>>>
>>> Let's endeavor to integrate it into the self-test suite. Although it
>>> presently only accommodates 64KB and 4KB, I'm optimistic that we can
>>> expand its capabilities to support multiple sizes and simulate more
>>> complex systems in the future as required.
>> IIUC, this is a performance test program instead of functionality
>> test
>> program.  Does it match the purpose of the kernel selftest?
>
> We do have the similar tests at least for ksm (ksm_tests.c) and
> probably others:
>
> $ git grep -l clock_gettime
> ksm_tests.c
> migration.c
> mremap_test.c
> transhuge-stress.c
>
>
> I recall that gup_test.c also measures performance things.

Good to know that!  Thanks for your information!

--
Best Regards,
Huang, Ying