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Message-ID: <CAGsJ_4y5+3jKx78-TWh_3jWoXQW4mmx=uKHbBSHWpvMj1eYW7A@mail.gmail.com>
Date: Mon, 15 Apr 2024 15:29:34 +1200
From: Barry Song <21cnbao@...il.com>
To: xu.xin16@....com.cn, yang.shi@...ux.alibaba.com
Cc: v-songbaohua@...o.com, mhocko@...nel.org, ryan.roberts@....com,
david@...hat.com, roman.gushchin@...ux.dev, shakeel.butt@...ux.dev,
muchun.song@...ux.dev, akpm@...ux-foundation.org, cgroups@...r.kernel.org,
linux-mm@...ck.org, linux-kernel@...r.kernel.org, ran.xiaokai@....com.cn,
yang.yang29@....com.cn, lu.zhongjun@....com.cn
Subject: Re: [PATCH] mm: thp: makes the memcg THP deferred split shrinker
aware of node_id
On Mon, Apr 15, 2024 at 3:11 PM <xu.xin16@....com.cn> wrote:
>
> From: Ran Xiaokai <ran.xiaokai@....com.cn>
>
> Since commit 87eaceb3faa5 ("mm: thp: make deferred split shrinker
> memcg aware"), the THP deferred split queue is per memcg but not
> per mem_cgroup_per_node. This has two aspects of impact:
>
> Impact1: for kswapd reclaim
> =====================
> kswapd
> balance_pgdat
> kswapd_shrink_node
> shrink_node(pgdat, sc);
> shrink_node_memcgs(pgdat, sc);
> shrink_slab(sc->gfp_mask, pgdat->node_id, memcg...);
> the parameter "pgdat->node_id" does not take effectct for
> THP deferred_split_shrinker, as the deferred_split_queue of
> specified memcg is not for a certain numa node but for all the nodes.
> We want to makes the memcg THP deferred split shrinker aware of
> node_id.
>
> Impact2: thp-deferred_split shrinker debugfs interface
> =========================================
> for the "count" file:
> <cgroup inode id> <objects on node 0> <objects on node 1>
> the output is acctually the sum of all numa nodes.
> for the "scan" file:
> <cgroup inode id> <numa id> <number of objects to scan>
> Also the "numa id" input does not take effect here.
>
> This patch makes memcg deferred_split_queue per mem_cgroup_per_node
> so try to conform to semantic logic.
This seems to be a correct fix to me, + Yang Shi, the original author of
commit 87eaceb3faa5.
>
> Reviewed-by: Lu Zhongjun <lu.zhongjun@....com.cn>
> Signed-off-by: Ran Xiaokai <ran.xiaokai@....com.cn>
> Cc: xu xin <xu.xin16@....com.cn>
> Cc: Yang Yang <yang.yang29@....com.cn>
> ---
> include/linux/memcontrol.h | 7 +++----
> mm/huge_memory.c | 6 +++---
> mm/memcontrol.c | 11 +++++------
> 3 files changed, 11 insertions(+), 13 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 394fd0a887ae..7282861d5a5d 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -130,6 +130,9 @@ struct mem_cgroup_per_node {
> bool on_tree;
> struct mem_cgroup *memcg; /* Back pointer, we cannot */
> /* use container_of */
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> + struct deferred_split deferred_split_queue;
> +#endif
> };
>
> struct mem_cgroup_threshold {
> @@ -327,10 +330,6 @@ struct mem_cgroup {
> struct list_head event_list;
> spinlock_t event_list_lock;
>
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> - struct deferred_split deferred_split_queue;
> -#endif
> -
> #ifdef CONFIG_LRU_GEN_WALKS_MMU
> /* per-memcg mm_struct list */
> struct lru_gen_mm_list mm_list;
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 9859aa4f7553..338d071070a6 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -774,7 +774,7 @@ struct deferred_split *get_deferred_split_queue(struct folio *folio)
> struct pglist_data *pgdat = NODE_DATA(folio_nid(folio));
>
> if (memcg)
> - return &memcg->deferred_split_queue;
> + return &memcg->nodeinfo[pgdat->node_id]->deferred_split_queue;
> else
> return &pgdat->deferred_split_queue;
> }
> @@ -3305,7 +3305,7 @@ static unsigned long deferred_split_count(struct shrinker *shrink,
>
> #ifdef CONFIG_MEMCG
> if (sc->memcg)
> - ds_queue = &sc->memcg->deferred_split_queue;
> + ds_queue = &sc->memcg->nodeinfo[sc->nid]->deferred_split_queue;
> #endif
> return READ_ONCE(ds_queue->split_queue_len);
> }
> @@ -3322,7 +3322,7 @@ static unsigned long deferred_split_scan(struct shrinker *shrink,
>
> #ifdef CONFIG_MEMCG
> if (sc->memcg)
> - ds_queue = &sc->memcg->deferred_split_queue;
> + ds_queue = &sc->memcg->nodeinfo[sc->nid]->deferred_split_queue;
> #endif
>
> spin_lock_irqsave(&ds_queue->split_queue_lock, flags);
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index fabce2b50c69..cdf9f5fa3b8e 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -5445,7 +5445,11 @@ static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
> kfree(pn);
> return 1;
> }
> -
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> + spin_lock_init(&pn->deferred_split_queue.split_queue_lock);
> + INIT_LIST_HEAD(&pn->deferred_split_queue.split_queue);
> + pn->deferred_split_queue.split_queue_len = 0;
> +#endif
> lruvec_init(&pn->lruvec);
> pn->memcg = memcg;
>
> @@ -5545,11 +5549,6 @@ static struct mem_cgroup *mem_cgroup_alloc(struct mem_cgroup *parent)
> for (i = 0; i < MEMCG_CGWB_FRN_CNT; i++)
> memcg->cgwb_frn[i].done =
> __WB_COMPLETION_INIT(&memcg_cgwb_frn_waitq);
> -#endif
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> - spin_lock_init(&memcg->deferred_split_queue.split_queue_lock);
> - INIT_LIST_HEAD(&memcg->deferred_split_queue.split_queue);
> - memcg->deferred_split_queue.split_queue_len = 0;
> #endif
> lru_gen_init_memcg(memcg);
> return memcg;
> --
> 2.15.2
>
Thanks
Barry
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