linux-kernel - Re: [RFC PATCH] mm/mbind: Introduce process_mbind() syscall for external memory binding

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Date:   Wed, 22 Nov 2023 16:45:08 -0500
From:   Gregory Price <gregory.price@...verge.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Vinicius Petrucci <vpetrucci@...il.com>, linux-mm@...r.kernel.org,
        linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
        minchan@...nel.org, dave.hansen@...ux.intel.com, x86@...nel.org,
        Jonathan.Cameron@...wei.com, aneesh.kumar@...ux.ibm.com,
        ying.huang@...el.com, dan.j.williams@...el.com,
        hezhongkun.hzk@...edance.com, fvdl@...gle.com, surenb@...gle.com,
        rientjes@...gle.com, hannes@...xchg.org, mhocko@...e.com,
        Hasan.Maruf@....com, jgroves@...ron.com, ravis.opensrc@...ron.com,
        sthanneeru@...ron.com, emirakhur@...ron.com,
        vtavarespetr@...ron.com
Subject: Re: [RFC PATCH] mm/mbind: Introduce process_mbind() syscall for
 external memory binding

On Wed, Nov 22, 2023 at 01:39:44PM -0800, Andrew Morton wrote:
> On Wed, 22 Nov 2023 15:31:05 -0600 Vinicius Petrucci <vpetrucci@...il.com> wrote:
> 
> > From: Vinicius Tavares Petrucci <vtavarespetr@...ron.com>
> > 
> > This patch introduces `process_mbind()` to enable a userspace orchestrator with 
> > an understanding of another process's memory layout to alter its memory policy. 
> 
> 
> I'm having deja vu.  Not 10 minutes ago, Gregory sent out a patchset
> which does the same thing.
> 
> https://lkml.kernel.org/r/20231122211200.31620-1-gregory.price@memverge.com
> 
> Please share notes ;)

Heh, we discussed doing this at linux plumbers, as well as a long set of
RFC's related to weighted mempolicies.

Guess we were in a bit of a race to RFC without knowing!

more context: mhocko suggested this interface would be welcome and useful
before the introduction of weighted inteleave.

link: https://lore.kernel.org/linux-mm/ZVNBMW8iJIGDyp0y@tiehlicka/

~Gregory