linux-kernel - Re: [RFC PATCH 3/3] mm/migrate: Create move_phys

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Date:   Tue, 19 Sep 2023 12:37:35 -0400
From:   Gregory Price <gregory.price@...verge.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Gregory Price <gourry.memverge@...il.com>,
        linux-mm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
        linux-cxl@...r.kernel.org, luto@...nel.org, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
        arnd@...db.de, akpm@...ux-foundation.org, x86@...nel.org
Subject: Re: [RFC PATCH 3/3] mm/migrate: Create move_phys_pages syscall

On Tue, Sep 19, 2023 at 02:17:15AM +0200, Thomas Gleixner wrote:
> On Thu, Sep 07 2023 at 03:54, Gregory Price wrote:
> > +	/* All tasks mapping each page is checked in phys_page_migratable */
> > +	nodes_setall(target_nodes);
> 
> How is the comment related to nodes_setall() and why is nodes_setall()
> unconditional when target_nodes is only used in the @nodes != NULL case?
> 

Short follow up, sorry for the spam.  I realized there is a better way
to do this by simply bypassing the task node check in do_pages_moves if
the mm_struct is NULL.  This removes the need for this struct
all-together.

Will simplify down for a v2 and add comments to do_pages_move
accordingly.

~Gregory