linux-kernel - Re: [PATCH v3 1/7] mm/lru: add per lruvec lock for memcg

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Date:   Fri, 15 Nov 2019 22:28:34 -0800
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Alex Shi <alex.shi@...ux.alibaba.com>
Cc:     Cgroups <cgroups@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Tejun Heo <tj@...nel.org>, Hugh Dickins <hughd@...gle.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Michal Hocko <mhocko@...e.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Arun KS <arunks@...eaurora.org>
Subject: Re: [PATCH v3 1/7] mm/lru: add per lruvec lock for memcg

On Fri, Nov 15, 2019 at 7:15 PM Alex Shi <alex.shi@...ux.alibaba.com> wrote:
>
> Currently memcg still use per node pgdat->lru_lock to guard its lruvec.
> That causes some lru_lock contention in a high container density system.
>
> If we can use per lruvec lock, that could relief much of the lru_lock
> contention.
>
> The later patches will replace the pgdat->lru_lock with lruvec->lru_lock
> and show the performance benefit by benchmarks.

Merge this patch with actual usage. No need to have a separate patch.

>
> Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Mel Gorman <mgorman@...hsingularity.net>
> Cc: Wei Yang <richard.weiyang@...il.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Arun KS <arunks@...eaurora.org>
> Cc: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
> Cc: Hugh Dickins <hughd@...gle.com>
> Cc: cgroups@...r.kernel.org
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  include/linux/mmzone.h | 2 ++
>  mm/mmzone.c            | 1 +
>  2 files changed, 3 insertions(+)
>
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 07b784ffbb14..a13b8a602ee5 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -267,6 +267,8 @@ struct lruvec {
>         unsigned long                   refaults;
>         /* Various lruvec state flags (enum lruvec_flags) */
>         unsigned long                   flags;
> +       /* per lruvec lru_lock for memcg */
> +       spinlock_t                      lru_lock;
>  #ifdef CONFIG_MEMCG
>         struct pglist_data *pgdat;
>  #endif
> diff --git a/mm/mmzone.c b/mm/mmzone.c
> index 4686fdc23bb9..3750a90ed4a0 100644
> --- a/mm/mmzone.c
> +++ b/mm/mmzone.c
> @@ -91,6 +91,7 @@ void lruvec_init(struct lruvec *lruvec)
>         enum lru_list lru;
>
>         memset(lruvec, 0, sizeof(struct lruvec));
> +       spin_lock_init(&lruvec->lru_lock);
>
>         for_each_lru(lru)
>                 INIT_LIST_HEAD(&lruvec->lists[lru]);
> --
> 1.8.3.1
>