linux-kernel - Re: [PATCH v4 2/2] dax/kmem: allow kmem to add memory with memmap_on

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Message-ID: <0b6f739b-723a-bc53-03a3-f4a793f339b4@redhat.com>
Date:   Mon, 2 Oct 2023 11:21:46 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Vishal Verma <vishal.l.verma@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <osalvador@...e.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Jiang <dave.jiang@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        nvdimm@...ts.linux.dev, linux-cxl@...r.kernel.org,
        Huang Ying <ying.huang@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Michal Hocko <mhocko@...e.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Jeff Moyer <jmoyer@...hat.com>
Subject: Re: [PATCH v4 2/2] dax/kmem: allow kmem to add memory with
 memmap_on_memory

On 28.09.23 22:30, Vishal Verma wrote:
> Large amounts of memory managed by the kmem driver may come in via CXL,
> and it is often desirable to have the memmap for this memory on the new
> memory itself.
> 
> Enroll kmem-managed memory for memmap_on_memory semantics if the dax
> region originates via CXL. For non-CXL dax regions, retain the existing
> default behavior of hot adding without memmap_on_memory semantics.
> 
> Add a sysfs override under the dax device to control this behavior and
> override either default.
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Oscar Salvador <osalvador@...e.de>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Dave Jiang <dave.jiang@...el.com>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Huang Ying <ying.huang@...el.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: Vishal Verma <vishal.l.verma@...el.com>
> ---

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb