linux-kernel - Re: [PATCH v2 5/6] mm/mm_init.c: remove unneeded calc_memmap

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Date: Thu, 28 Mar 2024 09:24:01 +0800
From: Baoquan He <bhe@...hat.com>
To: Mike Rapoport <rppt@...nel.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, x86@...nel.org,
	linuxppc-dev@...ts.ozlabs.org, akpm@...ux-foundation.org
Subject: Re: [PATCH v2 5/6] mm/mm_init.c: remove unneeded calc_memmap_size()

On 03/27/24 at 06:21pm, Mike Rapoport wrote:
> On Mon, Mar 25, 2024 at 10:56:45PM +0800, Baoquan He wrote:
> > Nobody calls calc_memmap_size() now.
> > 
> > Signed-off-by: Baoquan He <bhe@...hat.com>
> 
> Reviewed-by: Mike Rapoport (IBM) <rppt@...nel.org>
> 
> Looks like I replied to patch 6/6 twice by mistake and missed this one.

Thanks for your careful reviewing.

> 
> > ---
> >  mm/mm_init.c | 20 --------------------
> >  1 file changed, 20 deletions(-)
> > 
> > diff --git a/mm/mm_init.c b/mm/mm_init.c
> > index 7f71e56e83f3..e269a724f70e 100644
> > --- a/mm/mm_init.c
> > +++ b/mm/mm_init.c
> > @@ -1331,26 +1331,6 @@ static void __init calculate_node_totalpages(struct pglist_data *pgdat,
> >  	pr_debug("On node %d totalpages: %lu\n", pgdat->node_id, realtotalpages);
> >  }
> >  
> > -static unsigned long __init calc_memmap_size(unsigned long spanned_pages,
> > -						unsigned long present_pages)
> > -{
> > -	unsigned long pages = spanned_pages;
> > -
> > -	/*
> > -	 * Provide a more accurate estimation if there are holes within
> > -	 * the zone and SPARSEMEM is in use. If there are holes within the
> > -	 * zone, each populated memory region may cost us one or two extra
> > -	 * memmap pages due to alignment because memmap pages for each
> > -	 * populated regions may not be naturally aligned on page boundary.
> > -	 * So the (present_pages >> 4) heuristic is a tradeoff for that.
> > -	 */
> > -	if (spanned_pages > present_pages + (present_pages >> 4) &&
> > -	    IS_ENABLED(CONFIG_SPARSEMEM))
> > -		pages = present_pages;
> > -
> > -	return PAGE_ALIGN(pages * sizeof(struct page)) >> PAGE_SHIFT;
> > -}
> > -
> >  #ifdef CONFIG_TRANSPARENT_HUGEPAGE
> >  static void pgdat_init_split_queue(struct pglist_data *pgdat)
> >  {
> > -- 
> > 2.41.0
> > 
> 
> -- 
> Sincerely yours,
> Mike.
>