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SubjectRe: [PATCH] Cgroup: Fix memory accounting scalability in shrink_page_list
On Thu 19-07-12 16:34:26, Tim Chen wrote:
[...]
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 33dc256..aac5672 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -779,6 +779,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
>
> cond_resched();
>
> + mem_cgroup_uncharge_start();
> while (!list_empty(page_list)) {
> enum page_references references;
> struct address_space *mapping;

Is this safe? We have a scheduling point few lines below. What prevents
from task move while we are in the middle of the batch?

> @@ -1026,6 +1027,7 @@ keep_lumpy:
>
> list_splice(&ret_pages, page_list);
> count_vm_events(PGACTIVATE, pgactivate);
> + mem_cgroup_uncharge_end();
> *ret_nr_dirty += nr_dirty;
> *ret_nr_writeback += nr_writeback;
> return nr_reclaimed;
>
>
> --
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--
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9
Czech Republic


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