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 06/11] mm: vmscan: turn shrink_node_memcg() into shrink_lruvec()
Date: Wed, 6 Nov 2019 18:51:51 -0800 [thread overview]
Message-ID: <CALvZod4fCXrNd+uruEu6J3mjzRgHuK4Mu++fp-dH63Pfb11VHw@mail.gmail.com> (raw)
In-Reply-To: <20190603210746.15800-7-hannes@cmpxchg.org>
On Mon, Jun 3, 2019 at 3:07 PM Johannes Weiner <hannes@cmpxchg.org> wrote:
>
> A lruvec holds LRU pages owned by a certain NUMA node and cgroup.
> Instead of awkwardly passing around a combination of a pgdat and a
> memcg pointer, pass down the lruvec as soon as we can look it up.
>
> Nested callers that need to access node or cgroup properties can look
> them them up if necessary, but there are only a few cases.
*them
>
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
> ---
> mm/vmscan.c | 21 ++++++++++-----------
> 1 file changed, 10 insertions(+), 11 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 304974481146..b85111474ee2 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -2210,9 +2210,10 @@ enum scan_balance {
> * nr[0] = anon inactive pages to scan; nr[1] = anon active pages to scan
> * nr[2] = file inactive pages to scan; nr[3] = file active pages to scan
> */
> -static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
> - struct scan_control *sc, unsigned long *nr)
> +static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
> + unsigned long *nr)
> {
> + struct mem_cgroup *memcg = lruvec_memcg(lruvec);
> int swappiness = mem_cgroup_swappiness(memcg);
> struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
> u64 fraction[2];
> @@ -2460,13 +2461,8 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
> }
> }
>
> -/*
> - * This is a basic per-node page freer. Used by both kswapd and direct reclaim.
> - */
> -static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memcg,
> - struct scan_control *sc)
> +static void shrink_lruvec(struct lruvec *lruvec, struct scan_control *sc)
> {
> - struct lruvec *lruvec = mem_cgroup_lruvec(memcg, pgdat);
> unsigned long nr[NR_LRU_LISTS];
> unsigned long targets[NR_LRU_LISTS];
> unsigned long nr_to_scan;
> @@ -2476,7 +2472,7 @@ static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memc
> struct blk_plug plug;
> bool scan_adjusted;
>
> - get_scan_count(lruvec, memcg, sc, nr);
> + get_scan_count(lruvec, sc, nr);
>
> /* Record the original scan target for proportional adjustments later */
> memcpy(targets, nr, sizeof(nr));
> @@ -2689,6 +2685,7 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
>
> memcg = mem_cgroup_iter(root, NULL, &reclaim);
> do {
> + struct lruvec *lruvec = mem_cgroup_lruvec(memcg, pgdat);
> unsigned long reclaimed;
> unsigned long scanned;
>
> @@ -2725,7 +2722,8 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
>
> reclaimed = sc->nr_reclaimed;
> scanned = sc->nr_scanned;
> - shrink_node_memcg(pgdat, memcg, sc);
> +
> + shrink_lruvec(lruvec, sc);
>
> if (sc->may_shrinkslab) {
> shrink_slab(sc->gfp_mask, pgdat->node_id,
> @@ -3243,6 +3241,7 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
> pg_data_t *pgdat,
> unsigned long *nr_scanned)
> {
> + struct lruvec *lruvec = mem_cgroup_lruvec(memcg, pgdat);
> struct scan_control sc = {
> .nr_to_reclaim = SWAP_CLUSTER_MAX,
> .target_mem_cgroup = memcg,
> @@ -3268,7 +3267,7 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
> * will pick up pages from other mem cgroup's as well. We hack
> * the priority and make it zero.
> */
> - shrink_node_memcg(pgdat, memcg, &sc);
> + shrink_lruvec(lruvec, &sc);
>
> trace_mm_vmscan_memcg_softlimit_reclaim_end(
> cgroup_ino(memcg->css.cgroup),
> --
> 2.21.0
>
next prev parent reply other threads:[~2019-11-07 2:52 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
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 [this message]
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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