From: Michal Hocko <mhocko@kernel.org>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: "David S. Miller" <davem@davemloft.net>,
Andrew Morton <akpm@linux-foundation.org>,
Vladimir Davydov <vdavydov@virtuozzo.com>,
Tejun Heo <tj@kernel.org>,
netdev@vger.kernel.org, linux-mm@kvack.org,
cgroups@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 6/8] mm: vmscan: simplify memcg vs. global shrinker invocation
Date: Fri, 23 Oct 2015 15:26:22 +0200 [thread overview]
Message-ID: <20151023132622.GB15375@dhcp22.suse.cz> (raw)
In-Reply-To: <1445487696-21545-7-git-send-email-hannes@cmpxchg.org>
On Thu 22-10-15 00:21:34, Johannes Weiner wrote:
> Letting shrink_slab() handle the root_mem_cgroup, and implicitely the
> !CONFIG_MEMCG case, allows shrink_zone() to invoke the shrinkers
> unconditionally from within the memcg iteration loop.
>
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
> ---
> include/linux/memcontrol.h | 2 ++
> mm/vmscan.c | 31 ++++++++++++++++---------------
> 2 files changed, 18 insertions(+), 15 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 6f1e0f8..d66ae18 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -482,6 +482,8 @@ void mem_cgroup_split_huge_fixup(struct page *head);
> #else /* CONFIG_MEMCG */
> struct mem_cgroup;
>
> +#define root_mem_cgroup NULL
> +
> static inline void mem_cgroup_events(struct mem_cgroup *memcg,
> enum mem_cgroup_events_index idx,
> unsigned int nr)
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 9b52ecf..ecc2125 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -411,6 +411,10 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
> struct shrinker *shrinker;
> unsigned long freed = 0;
>
> + /* Global shrinker mode */
> + if (memcg == root_mem_cgroup)
> + memcg = NULL;
> +
> if (memcg && !memcg_kmem_is_active(memcg))
> return 0;
>
> @@ -2417,11 +2421,22 @@ static bool shrink_zone(struct zone *zone, struct scan_control *sc,
> shrink_lruvec(lruvec, swappiness, sc, &lru_pages);
> zone_lru_pages += lru_pages;
>
> - if (memcg && is_classzone)
> + /*
> + * Shrink the slab caches in the same proportion that
> + * the eligible LRU pages were scanned.
> + */
> + if (is_classzone) {
> shrink_slab(sc->gfp_mask, zone_to_nid(zone),
> memcg, sc->nr_scanned - scanned,
> lru_pages);
>
> + if (reclaim_state) {
> + sc->nr_reclaimed +=
> + reclaim_state->reclaimed_slab;
> + reclaim_state->reclaimed_slab = 0;
> + }
> + }
> +
> /*
> * Direct reclaim and kswapd have to scan all memory
> * cgroups to fulfill the overall scan target for the
> @@ -2439,20 +2454,6 @@ static bool shrink_zone(struct zone *zone, struct scan_control *sc,
> }
> } while ((memcg = mem_cgroup_iter(root, memcg, &reclaim)));
>
> - /*
> - * Shrink the slab caches in the same proportion that
> - * the eligible LRU pages were scanned.
> - */
> - if (global_reclaim(sc) && is_classzone)
> - shrink_slab(sc->gfp_mask, zone_to_nid(zone), NULL,
> - sc->nr_scanned - nr_scanned,
> - zone_lru_pages);
> -
> - if (reclaim_state) {
> - sc->nr_reclaimed += reclaim_state->reclaimed_slab;
> - reclaim_state->reclaimed_slab = 0;
> - }
> -
> vmpressure(sc->gfp_mask, sc->target_mem_cgroup,
> sc->nr_scanned - nr_scanned,
> sc->nr_reclaimed - nr_reclaimed);
> --
> 2.6.1
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2015-10-23 13:26 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-22 4:21 [PATCH 0/8] mm: memcontrol: account socket memory in unified hierarchy Johannes Weiner
2015-10-22 4:21 ` [PATCH 1/8] mm: page_counter: let page_counter_try_charge() return bool Johannes Weiner
2015-10-23 11:31 ` Michal Hocko
2015-10-22 4:21 ` [PATCH 2/8] mm: memcontrol: export root_mem_cgroup Johannes Weiner
2015-10-23 11:32 ` Michal Hocko
2015-10-22 4:21 ` [PATCH 3/8] net: consolidate memcg socket buffer tracking and accounting Johannes Weiner
2015-10-22 18:46 ` Vladimir Davydov
2015-10-22 19:09 ` Johannes Weiner
2015-10-23 13:42 ` Vladimir Davydov
2015-10-23 12:38 ` Michal Hocko
2015-10-22 4:21 ` [PATCH 4/8] mm: memcontrol: prepare for unified hierarchy socket accounting Johannes Weiner
2015-10-23 12:39 ` Michal Hocko
2015-10-22 4:21 ` [PATCH 5/8] mm: memcontrol: account socket memory on unified hierarchy Johannes Weiner
2015-10-22 18:47 ` Vladimir Davydov
2015-10-23 13:19 ` Michal Hocko
2015-10-23 13:59 ` David Miller
2015-10-26 16:56 ` Johannes Weiner
2015-10-27 12:26 ` Michal Hocko
2015-10-27 13:49 ` David Miller
2015-10-27 15:41 ` Johannes Weiner
2015-10-27 16:15 ` Michal Hocko
2015-10-27 16:42 ` Johannes Weiner
2015-10-28 0:45 ` David Miller
2015-10-28 3:05 ` Johannes Weiner
2015-10-29 15:25 ` Michal Hocko
2015-10-29 16:10 ` Johannes Weiner
2015-11-04 10:42 ` Michal Hocko
2015-11-04 19:50 ` Johannes Weiner
2015-11-05 14:40 ` Michal Hocko
2015-11-05 16:16 ` David Miller
2015-11-05 16:28 ` Michal Hocko
2015-11-05 16:30 ` David Miller
2015-11-05 22:32 ` Johannes Weiner
2015-11-06 12:51 ` Michal Hocko
2015-11-05 20:55 ` Johannes Weiner
2015-11-05 22:52 ` Johannes Weiner
2015-11-06 10:57 ` Michal Hocko
2015-11-06 16:19 ` Johannes Weiner
2015-11-06 16:46 ` Michal Hocko
2015-11-06 17:45 ` Johannes Weiner
2015-11-07 3:45 ` David Miller
2015-11-12 18:36 ` Mel Gorman
2015-11-12 19:12 ` Johannes Weiner
2015-11-06 9:05 ` Vladimir Davydov
2015-11-06 13:29 ` Michal Hocko
2015-11-06 16:35 ` Johannes Weiner
2015-11-06 13:21 ` Michal Hocko
2015-10-22 4:21 ` [PATCH 6/8] mm: vmscan: simplify memcg vs. global shrinker invocation Johannes Weiner
2015-10-23 13:26 ` Michal Hocko [this message]
2015-10-22 4:21 ` [PATCH 7/8] mm: vmscan: report vmpressure at the level of reclaim activity Johannes Weiner
2015-10-22 18:48 ` Vladimir Davydov
2015-10-23 13:49 ` Michal Hocko
2015-10-22 4:21 ` [PATCH 8/8] mm: memcontrol: hook up vmpressure to socket pressure Johannes Weiner
2015-10-22 18:57 ` Vladimir Davydov
2015-10-22 18:45 ` [PATCH 0/8] mm: memcontrol: account socket memory in unified hierarchy Vladimir Davydov
2015-10-26 17:22 ` Johannes Weiner
2015-10-27 8:43 ` Vladimir Davydov
2015-10-27 16:01 ` Johannes Weiner
2015-10-28 8:20 ` Vladimir Davydov
2015-10-28 18:58 ` Johannes Weiner
2015-10-29 9:27 ` Vladimir Davydov
2015-10-29 17:52 ` Johannes Weiner
2015-11-02 14:47 ` Vladimir Davydov
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