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 07/11] mm: vmscan: split shrink_node() into node part and memcgs part
Date: Wed, 6 Nov 2019 18:51:59 -0800 [thread overview]
Message-ID: <CALvZod7EFBD0SCoUFHacEtZqi7hcZ3S6FEZRmfJJORre3dxRtQ@mail.gmail.com> (raw)
In-Reply-To: <20190603210746.15800-8-hannes@cmpxchg.org>
On Mon, Jun 3, 2019 at 3:00 PM Johannes Weiner <hannes@cmpxchg.org> wrote:
>
> This function is getting long and unwieldy. The new shrink_node()
> handles the generic (node) reclaim aspects:
> - global vmpressure notifications
> - writeback and congestion throttling
> - reclaim/compaction management
> - kswapd giving up on unreclaimable nodes
>
> It then calls shrink_node_memcgs() which handles cgroup specifics:
> - the cgroup tree traversal
> - memory.low considerations
> - per-cgroup slab shrinking callbacks
> - per-cgroup vmpressure notifications
>
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
> ---
> mm/vmscan.c | 29 ++++++++++++++++++-----------
> 1 file changed, 18 insertions(+), 11 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index b85111474ee2..ee79b39d0538 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -2665,24 +2665,15 @@ static bool pgdat_memcg_congested(pg_data_t *pgdat, struct mem_cgroup *memcg)
> (memcg && memcg_congested(pgdat, memcg));
> }
>
> -static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
> +static void shrink_node_memcgs(pg_data_t *pgdat, struct scan_control *sc)
> {
> - struct reclaim_state *reclaim_state = current->reclaim_state;
> struct mem_cgroup *root = sc->target_mem_cgroup;
> struct mem_cgroup_reclaim_cookie reclaim = {
> .pgdat = pgdat,
> .priority = sc->priority,
> };
> - unsigned long nr_reclaimed, nr_scanned;
> - bool reclaimable = false;
> struct mem_cgroup *memcg;
>
> -again:
> - memset(&sc->nr, 0, sizeof(sc->nr));
> -
> - nr_reclaimed = sc->nr_reclaimed;
> - nr_scanned = sc->nr_scanned;
> -
> memcg = mem_cgroup_iter(root, NULL, &reclaim);
> do {
> struct lruvec *lruvec = mem_cgroup_lruvec(memcg, pgdat);
> @@ -2750,6 +2741,22 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
> break;
> }
> } while ((memcg = mem_cgroup_iter(root, memcg, &reclaim)));
> +}
> +
> +static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
> +{
> + struct reclaim_state *reclaim_state = current->reclaim_state;
> + struct mem_cgroup *root = sc->target_mem_cgroup;
> + unsigned long nr_reclaimed, nr_scanned;
> + bool reclaimable = false;
> +
> +again:
> + memset(&sc->nr, 0, sizeof(sc->nr));
> +
> + nr_reclaimed = sc->nr_reclaimed;
> + nr_scanned = sc->nr_scanned;
> +
> + shrink_node_memcgs(pgdat, sc);
>
> if (reclaim_state) {
> sc->nr_reclaimed += reclaim_state->reclaimed_slab;
> @@ -2757,7 +2764,7 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
> }
>
> /* Record the subtree's reclaim efficiency */
> - vmpressure(sc->gfp_mask, sc->target_mem_cgroup, true,
> + vmpressure(sc->gfp_mask, root, true,
> sc->nr_scanned - nr_scanned,
> sc->nr_reclaimed - nr_reclaimed);
>
> --
> 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
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 [this message]
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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