On Wed 30-06-21 05:00:21, Matthew Wilcox wrote:
> memcg_check_events only uses the page's nid, so call page_to_nid in the
> callers to make the folio conversion easier.
It will also make the interface slightly easier to follow as there
shouldn't be any real reason to take the page for these events.
So this is a good cleanup in general.
> Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Thanks.
> ---
> mm/memcontrol.c | 23 ++++++++++++-----------
> 1 file changed, 12 insertions(+), 11 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 29fdb70dca42..5d143d46a8a4 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -846,7 +846,7 @@ static bool mem_cgroup_event_ratelimit(struct mem_cgroup *memcg,
> * Check events in order.
> *
> */
> -static void memcg_check_events(struct mem_cgroup *memcg, struct page *page)
> +static void memcg_check_events(struct mem_cgroup *memcg, int nid)
> {
> /* threshold event is triggered in finer grain than soft limit */
> if (unlikely(mem_cgroup_event_ratelimit(memcg,
> @@ -857,7 +857,7 @@ static void memcg_check_events(struct mem_cgroup *memcg, struct page *page)
> MEM_CGROUP_TARGET_SOFTLIMIT);
> mem_cgroup_threshold(memcg);
> if (unlikely(do_softlimit))
> - mem_cgroup_update_tree(memcg, page_to_nid(page));
> + mem_cgroup_update_tree(memcg, nid);
> }
> }
>
> @@ -5573,7 +5573,7 @@ static int mem_cgroup_move_account(struct page *page,
> struct lruvec *from_vec, *to_vec;
> struct pglist_data *pgdat;
> unsigned int nr_pages = compound ? thp_nr_pages(page) : 1;
> - int ret;
> + int nid, ret;
>
> VM_BUG_ON(from == to);
> VM_BUG_ON_PAGE(PageLRU(page), page);
> @@ -5662,12 +5662,13 @@ static int mem_cgroup_move_account(struct page *page,
> __unlock_page_memcg(from);
>
> ret = 0;
> + nid = page_to_nid(page);
>
> local_irq_disable();
> mem_cgroup_charge_statistics(to, nr_pages);
> - memcg_check_events(to, page);
> + memcg_check_events(to, nid);
> mem_cgroup_charge_statistics(from, -nr_pages);
> - memcg_check_events(from, page);
> + memcg_check_events(from, nid);
> local_irq_enable();
> out_unlock:
> unlock_page(page);
> @@ -6688,7 +6689,7 @@ static int __mem_cgroup_charge(struct page *page, struct mem_cgroup *memcg,
>
> local_irq_disable();
> mem_cgroup_charge_statistics(memcg, nr_pages);
> - memcg_check_events(memcg, page);
> + memcg_check_events(memcg, page_to_nid(page));
> local_irq_enable();
> out:
> return ret;
> @@ -6796,7 +6797,7 @@ struct uncharge_gather {
> unsigned long nr_memory;
> unsigned long pgpgout;
> unsigned long nr_kmem;
> - struct page *dummy_page;
> + int nid;
> };
>
> static inline void uncharge_gather_clear(struct uncharge_gather *ug)
> @@ -6820,7 +6821,7 @@ static void uncharge_batch(const struct uncharge_gather *ug)
> local_irq_save(flags);
> __count_memcg_events(ug->memcg, PGPGOUT, ug->pgpgout);
> __this_cpu_add(ug->memcg->vmstats_percpu->nr_page_events, ug->nr_memory);
> - memcg_check_events(ug->memcg, ug->dummy_page);
> + memcg_check_events(ug->memcg, ug->nid);
> local_irq_restore(flags);
>
> /* drop reference from uncharge_page */
> @@ -6861,7 +6862,7 @@ static void uncharge_page(struct page *page, struct uncharge_gather *ug)
> uncharge_gather_clear(ug);
> }
> ug->memcg = memcg;
> - ug->dummy_page = page;
> + ug->nid = page_to_nid(page);
>
> /* pairs with css_put in uncharge_batch */
> css_get(&memcg->css);
> @@ -6979,7 +6980,7 @@ void mem_cgroup_migrate(struct page *oldpage, struct page *newpage)
>
> local_irq_save(flags);
> mem_cgroup_charge_statistics(memcg, nr_pages);
> - memcg_check_events(memcg, newpage);
> + memcg_check_events(memcg, page_to_nid(newpage));
> local_irq_restore(flags);
> }
>
> @@ -7209,7 +7210,7 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
> */
> VM_BUG_ON(!irqs_disabled());
> mem_cgroup_charge_statistics(memcg, -nr_entries);
> - memcg_check_events(memcg, page);
> + memcg_check_events(memcg, page_to_nid(page));
>
> css_put(&memcg->css);
> }
> --
> 2.30.2
--
Michal Hocko
SUSE Labs
