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SubjectRe: [PATCH] mm/memcg: remove unneeded nr_scanned
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On 28.03.22 13:41, Miaohe Lin wrote:
> The local variable nr_scanned is unneeded as mem_cgroup_soft_reclaim always
> does *total_scanned += nr_scanned. So we can pass total_scanned directly to
> the mem_cgroup_soft_reclaim to simplify the code and save some cpu cycles
> of adding nr_scanned to total_scanned.
>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
> mm/memcontrol.c | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index b686ec4f42c6..79341365ec90 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3384,7 +3384,6 @@ unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
> int loop = 0;
> struct mem_cgroup_tree_per_node *mctz;
> unsigned long excess;
> - unsigned long nr_scanned;
>
> if (order > 0)
> return 0;
> @@ -3412,11 +3411,9 @@ unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
> if (!mz)
> break;
>
> - nr_scanned = 0;
> reclaimed = mem_cgroup_soft_reclaim(mz->memcg, pgdat,
> - gfp_mask, &nr_scanned);
> + gfp_mask, total_scanned);
> nr_reclaimed += reclaimed;
> - *total_scanned += nr_scanned;
> spin_lock_irq(&mctz->lock);
> __mem_cgroup_remove_exceeded(mz, mctz);
>

Reviewed-by: David Hildenbrand <david@redhat.com>

--
Thanks,

David / dhildenb

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