linux-kernel - Re: [RFC v3 3/3] ktest: sys_move_phys

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Message-ID: <ZfnXcbd3h3Rj4IIS@casper.infradead.org>
Date: Tue, 19 Mar 2024 18:20:33 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Gregory Price <gregory.price@...verge.com>
Cc: Gregory Price <gourry.memverge@...il.com>, linux-mm@...ck.org,
	linux-api@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
	ying.huang@...el.com, dan.j.williams@...el.com, honggyu.kim@...com,
	corbet@....net, arnd@...db.de, luto@...nel.org,
	akpm@...ux-foundation.org, shuah@...nel.org
Subject: Re: [RFC v3 3/3] ktest: sys_move_phys_pages ktest

On Tue, Mar 19, 2024 at 02:14:33PM -0400, Gregory Price wrote:
> On Tue, Mar 19, 2024 at 05:52:46PM +0000, Matthew Wilcox wrote:
> > On Tue, Mar 19, 2024 at 01:26:09PM -0400, Gregory Price wrote:
> > > Implement simple ktest that looks up the physical address via
> > > /proc/self/pagemap and migrates the page based on that information.
> > 
> > What?  LOL.  No.
> > 
> 
> Certainly the test is stupid and requires admin, but I could not
> come up an easier test to demonstrate the concept - and the docs
> say to include a test with all syscall proposals.
> 
> Am I missing something else important?
> (stupid question: of course I am, but alas I must ask it)

It's not that the test is stupid.  It's the concept that's stupid.