Re: [RFC] vmscan: initialize sc->nr_reclaimed in do_try_to_free_pages()

[KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>]

> ---
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 9a27c44..18406ee 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1699,6 +1699,7 @@ unsigned long try_to_free_pages(struct zonelist
> *zonelist, int order,
>                 .order = order,
>                 .mem_cgroup = NULL,
>                 .isolate_pages = isolate_pages_global,
> +               .nr_reclaimed = 0,
>         };
> 
>         return do_try_to_free_pages(zonelist, &sc);
> @@ -1719,6 +1720,7 @@ unsigned long
> try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
>                 .order = 0,
>                 .mem_cgroup = mem_cont,
>                 .isolate_pages = mem_cgroup_isolate_pages,
> +               .nr_reclaimed = 0;
>         };
>         struct zonelist *zonelist;

I think this code is better.

and, I think we also need to 


static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
{
        /* Minimum pages needed in order to stay on node */
        const unsigned long nr_pages = 1 << order;
        struct task_struct *p = current;
        struct reclaim_state reclaim_state;
        int priority;
        struct scan_control sc = {
                .may_writepage = !!(zone_reclaim_mode & RECLAIM_WRITE),
                .may_swap = !!(zone_reclaim_mode & RECLAIM_SWAP),
                .swap_cluster_max = max_t(unsigned long, nr_pages,
                                        SWAP_CLUSTER_MAX),
                .gfp_mask = gfp_mask,
                .swappiness = vm_swappiness,
                .isolate_pages = isolate_pages_global,
+               .nr_reclaimed = 0;
        };




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