linux-kernel - Re: [PATCH 03/11] mm: vmscan: simplify lruvec_lru

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Message-ID: <CALvZod5ac0fmfD+92kg8nu4zV31ow95DJmvsTp8Rh4Ff+FhcXg@mail.gmail.com>
Date:   Wed, 6 Nov 2019 18:51:02 -0800
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Michal Hocko <mhocko@...e.com>, Linux MM <linux-mm@...ck.org>,
        Cgroups <cgroups@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH 03/11] mm: vmscan: simplify lruvec_lru_size()

On Mon, Jun 3, 2019 at 2:59 PM Johannes Weiner <hannes@...xchg.org> wrote:
>
> This function currently takes the node or lruvec size and subtracts
> the zones that are excluded by the classzone index of the
> allocation. It uses four different types of counters to do this.
>
> Just add up the eligible zones.
>
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

I think this became part of other series. Anyways:

Reviewed-by: Shakeel Butt <shakeelb@...gle.com>


> ---
>  mm/vmscan.c | 19 +++++--------------
>  1 file changed, 5 insertions(+), 14 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 853be16ee5e2..69c4c82a9b5a 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -342,30 +342,21 @@ unsigned long zone_reclaimable_pages(struct zone *zone)
>   */
>  unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru, int zone_idx)
>  {
> -       unsigned long lru_size;
> +       unsigned long size = 0;
>         int zid;
>
> -       if (!mem_cgroup_disabled())
> -               lru_size = lruvec_page_state_local(lruvec, NR_LRU_BASE + lru);
> -       else
> -               lru_size = node_page_state(lruvec_pgdat(lruvec), NR_LRU_BASE + lru);
> -
> -       for (zid = zone_idx + 1; zid < MAX_NR_ZONES; zid++) {
> +       for (zid = 0; zid <= zone_idx; zid++) {
>                 struct zone *zone = &lruvec_pgdat(lruvec)->node_zones[zid];
> -               unsigned long size;
>
>                 if (!managed_zone(zone))
>                         continue;
>
>                 if (!mem_cgroup_disabled())
> -                       size = mem_cgroup_get_zone_lru_size(lruvec, lru, zid);
> +                       size += mem_cgroup_get_zone_lru_size(lruvec, lru, zid);
>                 else
> -                       size = zone_page_state(&lruvec_pgdat(lruvec)->node_zones[zid],
> -                                      NR_ZONE_LRU_BASE + lru);
> -               lru_size -= min(size, lru_size);
> +                       size += zone_page_state(zone, NR_ZONE_LRU_BASE + lru);
>         }
> -
> -       return lru_size;
> +       return size;
>
>  }
>
> --
> 2.21.0
>