linux-kernel - Re: [PATCH] memblock: Introduce memblock_reserve

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Message-ID: <ZJkudvnGz+Tt5Qml@kernel.org>
Date:   Mon, 26 Jun 2023 09:21:42 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Yajun Deng <yajun.deng@...ux.dev>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memblock: Introduce memblock_reserve_node()

On Sun, Jun 25, 2023 at 07:39:10AM +0000, Yajun Deng wrote:
> June 25, 2023 1:08 PM, "Mike Rapoport" <rppt@...nel.org> wrote:
> 
> > On Sat, Jun 24, 2023 at 10:46:22AM +0800, Yajun Deng wrote:
> > 
> >> It only returns address now in memblock_find_in_range_node(), we can add a
> >> parameter pointing to integer for node id of the range, which can be used
> >> to pass the node id to the new reserve region.
> >> 
> >> Introduce memblock_reserve_node() so that the node id can be passed to
> >> the reserve region in memblock_alloc_range_nid().
> >> 
> >> Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
> > 
> > What problem does this patch solve?
> >
> 
> If we set nid and flags in memblock_alloc_range_nid(), we may not need
> memblock_set_node() in memmap_init_reserved_pages().

When memblock_reserve() is called before NUMA setup, the node ids are still
unset in memblock.memory, so very early reservations will be missed and we
still have to update node ids in memblock.reserved later.
 
> I tested this patch and delete memblock_set_node() in memmap_init_reserved_pages().
> It works fine. I did not delete memblock_set_node() in this patch just in case.

-- 
Sincerely yours,
Mike.