linux-kernel - Re: [PATCH v5 1/4] mm/sparse: Add a static variable nr_present

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Date:   Wed, 27 Jun 2018 23:10:41 -0400
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     bhe@...hat.com
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        dave.hansen@...el.com, pagupta@...hat.com,
        Linux Memory Management List <linux-mm@...ck.org>,
        kirill.shutemov@...ux.intel.com
Subject: Re: [PATCH v5 1/4] mm/sparse: Add a static variable nr_present_sections

Reviewed-by: Pavel Tatashin <pasha.tatashin@...cle.com>
On Tue, Jun 26, 2018 at 9:31 PM Baoquan He <bhe@...hat.com> wrote:
>
> It's used to record how many memory sections are marked as present
> during system boot up, and will be used in the later patch.
>
> Signed-off-by: Baoquan He <bhe@...hat.com>
> ---
>  mm/sparse.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/mm/sparse.c b/mm/sparse.c
> index f13f2723950a..6314303130b0 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -200,6 +200,12 @@ static inline int next_present_section_nr(int section_nr)
>               (section_nr <= __highest_present_section_nr));    \
>              section_nr = next_present_section_nr(section_nr))
>
> +/*
> + * Record how many memory sections are marked as present
> + * during system bootup.
> + */
> +static int __initdata nr_present_sections;
> +
>  /* Record a memory area against a node. */
>  void __init memory_present(int nid, unsigned long start, unsigned long end)
>  {
> @@ -229,6 +235,7 @@ void __init memory_present(int nid, unsigned long start, unsigned long end)
>                         ms->section_mem_map = sparse_encode_early_nid(nid) |
>                                                         SECTION_IS_ONLINE;
>                         section_mark_present(ms);
> +                       nr_present_sections++;
>                 }
>         }
>  }
> --
> 2.13.6
>