Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1448448

Re: [PATCH] update sc->nr_reclaimed after each shrink_slab

Show all headers | View raw

On Fri 22-07-16 11:43:30, Zhou Chengming wrote:
> In !global_reclaim(sc) case, we should update sc->nr_reclaimed after each
> shrink_slab in the loop. Because we need the correct sc->nr_reclaimed
> value to see if we can break out.

Does this actually change anything? Maybe I am missing something but
try_to_free_mem_cgroup_pages which is the main entry for the memcg
reclaim doesn't set reclaim_state. I don't remember why... Vladimir?

Have you observed any issues and this patch fixes it or this is just
motivated by the code inspection?

> Signed-off-by: Zhou Chengming <zhouchengming1@huawei.com>
> ---
>  mm/vmscan.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index c4a2f45..47133c3 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -2405,6 +2405,11 @@ static bool shrink_zone(struct zone *zone, struct scan_control *sc,
>  					    memcg, sc->nr_scanned - scanned,
>  					    lru_pages);
>  
> +			if (!global_reclaim(sc) && reclaim_state) {
> +				sc->nr_reclaimed += reclaim_state->reclaimed_slab;
> +				reclaim_state->reclaimed_slab = 0;
> +			}
> +
>  			/* Record the group's reclaim efficiency */
>  			vmpressure(sc->gfp_mask, memcg, false,
>  				   sc->nr_scanned - scanned,
> -- 
> 1.7.7
> 

-- 
Michal Hocko
SUSE Labs

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH] update sc->nr_reclaimed after each shrink_slab Zhou Chengming <zhouchengming1@huawei.com> - 2016-07-22 05:50 +0200
  Re: [PATCH] update sc->nr_reclaimed after each shrink_slab Michal Hocko <mhocko@kernel.org> - 2016-07-22 09:50 +0200
    Re: [PATCH] update sc->nr_reclaimed after each shrink_slab Michal Hocko <mhocko@kernel.org> - 2016-07-22 10:20 +0200

csiph-web