From: Shakeel Butt <shakeelb@google.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>, Linux MM <linux-mm@kvack.org>,
Cgroups <cgroups@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Kernel Team <kernel-team@fb.com>
Subject: Re: [PATCH 01/11] mm: vmscan: move inactive_list_is_low() swap check to the caller
Date: Wed, 6 Nov 2019 18:50:37 -0800 [thread overview]
Message-ID: <CALvZod64t1OGuhrvB1QChUYvUs2yQF-qAi5F=gcntHN84rr=sQ@mail.gmail.com> (raw)
In-Reply-To: <20190603210746.15800-2-hannes@cmpxchg.org>
On Mon, Jun 3, 2019 at 3:05 PM Johannes Weiner <hannes@cmpxchg.org> wrote:
>
> inactive_list_is_low() should be about one thing: checking the ratio
> between inactive and active list. Kitchensink checks like the one for
> swap space makes the function hard to use and modify its
> callsites. Luckly, most callers already have an understanding of the
> swap situation, so it's easy to clean up.
>
> get_scan_count() has its own, memcg-aware swap check, and doesn't even
> get to the inactive_list_is_low() check on the anon list when there is
> no swap space available.
>
> shrink_list() is called on the results of get_scan_count(), so that
> check is redundant too.
>
> age_active_anon() has its own totalswap_pages check right before it
> checks the list proportions.
>
> The shrink_node_memcg() site is the only one that doesn't do its own
> swap check. Add it there.
>
> Then delete the swap check from inactive_list_is_low().
>
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
> ---
> mm/vmscan.c | 9 +--------
> 1 file changed, 1 insertion(+), 8 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 84dcb651d05c..f396424850aa 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -2165,13 +2165,6 @@ static bool inactive_list_is_low(struct lruvec *lruvec, bool file,
> unsigned long refaults;
> unsigned long gb;
>
> - /*
> - * If we don't have swap space, anonymous page deactivation
> - * is pointless.
> - */
> - if (!file && !total_swap_pages)
> - return false;
> -
> inactive = lruvec_lru_size(lruvec, inactive_lru, sc->reclaim_idx);
> active = lruvec_lru_size(lruvec, active_lru, sc->reclaim_idx);
>
> @@ -2592,7 +2585,7 @@ static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memc
> * Even if we did not try to evict anon pages at all, we want to
> * rebalance the anon lru active/inactive ratio.
> */
> - if (inactive_list_is_low(lruvec, false, sc, true))
> + if (total_swap_pages && inactive_list_is_low(lruvec, false, sc, true))
> shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
> sc, LRU_ACTIVE_ANON);
> }
> --
> 2.21.0
>
next prev parent reply other threads:[~2019-11-07 2:50 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-03 21:07 [PATCH 00/11] mm: fix page aging across multiple cgroups Johannes Weiner
2019-06-03 21:07 ` [PATCH 01/11] mm: vmscan: move inactive_list_is_low() swap check to the caller Johannes Weiner
2019-11-07 2:50 ` Shakeel Butt [this message]
2019-11-08 3:43 ` Andrew Morton
2019-06-03 21:07 ` [PATCH 02/11] mm: clean up and clarify lruvec lookup procedure Johannes Weiner
2019-11-07 2:50 ` Shakeel Butt
2019-06-03 21:07 ` [PATCH 03/11] mm: vmscan: simplify lruvec_lru_size() Johannes Weiner
2019-11-07 2:51 ` Shakeel Butt
2019-06-03 21:07 ` [PATCH 04/11] mm: vmscan: naming fixes: cgroup_reclaim() and writeback_working() Johannes Weiner
2019-11-07 2:51 ` Shakeel Butt
2019-06-03 21:07 ` [PATCH 05/11] mm: vmscan: replace shrink_node() loop with a retry jump Johannes Weiner
2019-11-07 2:51 ` Shakeel Butt
2019-06-03 21:07 ` [PATCH 06/11] mm: vmscan: turn shrink_node_memcg() into shrink_lruvec() Johannes Weiner
2019-11-07 2:51 ` Shakeel Butt
2019-06-03 21:07 ` [PATCH 07/11] mm: vmscan: split shrink_node() into node part and memcgs part Johannes Weiner
2019-11-07 2:51 ` Shakeel Butt
2019-06-03 21:07 ` [PATCH 08/11] mm: vmscan: harmonize writeback congestion tracking for nodes & memcgs Johannes Weiner
2019-11-07 2:52 ` Shakeel Butt
2019-06-03 21:07 ` [PATCH 09/11] mm: vmscan: move file exhaustion detection to the node level Johannes Weiner
2019-11-07 2:52 ` Shakeel Butt
2019-06-03 21:07 ` [PATCH 10/11] mm: vmscan: detect file thrashing at the reclaim root Johannes Weiner
2019-06-03 21:07 ` [PATCH 11/11] mm: vmscan: enforce inactive:active ratio " Johannes Weiner
2019-11-07 2:50 ` [PATCH 00/11] mm: fix page aging across multiple cgroups Shakeel Butt
2019-11-07 17:45 ` Johannes Weiner
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