Re: [PATCH v3 5/8] mm: don't track number of pages during deferred initialization

[Alexander Duyck]

On Wed, May 27, 2020 at 10:37 AM Daniel Jordan
<daniel.m.jordan@xxxxxxxxxx> wrote:
>
> Deferred page init used to report the number of pages initialized:
>
>   node 0 initialised, 32439114 pages in 97ms
>
> Tracking this makes the code more complicated when using multiple
> threads.  Given that the statistic probably has limited value,
> especially since a zone grows on demand so that the page count can vary,
> just remove it.
>
> The boot message now looks like
>
>   node 0 deferred pages initialised in 97ms
>
> Signed-off-by: Daniel Jordan <daniel.m.jordan@xxxxxxxxxx>
> Suggested-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx>

This looks good to me.

Reviewed-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx>

> ---
>  mm/page_alloc.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index d0c0d9364aa6d..d64f3027fdfa6 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1819,7 +1819,7 @@ static int __init deferred_init_memmap(void *data)
>  {
>         pg_data_t *pgdat = data;
>         const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id);
> -       unsigned long spfn = 0, epfn = 0, nr_pages = 0;
> +       unsigned long spfn = 0, epfn = 0;
>         unsigned long first_init_pfn, flags;
>         unsigned long start = jiffies;
>         struct zone *zone;
> @@ -1868,15 +1868,15 @@ static int __init deferred_init_memmap(void *data)
>          * allocator.
>          */
>         while (spfn < epfn) {
> -               nr_pages += deferred_init_maxorder(&i, zone, &spfn, &epfn);
> +               deferred_init_maxorder(&i, zone, &spfn, &epfn);
>                 cond_resched();
>         }
>  zone_empty:
>         /* Sanity check that the next zone really is unpopulated */
>         WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone));
>
> -       pr_info("node %d initialised, %lu pages in %ums\n",
> -               pgdat->node_id, nr_pages, jiffies_to_msecs(jiffies - start));
> +       pr_info("node %d deferred pages initialised in %ums\n",
> +               pgdat->node_id, jiffies_to_msecs(jiffies - start));
>
>         pgdat_init_report_one_done();
>         return 0;
> --
> 2.26.2
>
>