Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Sun, 13 May 2018 19:57:56 +0300
From:   Vladimir Davydov <vdavydov.dev@gmail.com>
To:     Kirill Tkhai <ktkhai@virtuozzo.com>
Cc:     akpm@linux-foundation.org, shakeelb@google.com,
        viro@zeniv.linux.org.uk, hannes@cmpxchg.org, mhocko@kernel.org,
        tglx@linutronix.de, pombredanne@nexb.com, stummala@codeaurora.org,
        gregkh@linuxfoundation.org, sfr@canb.auug.org.au, guro@fb.com,
        mka@chromium.org, penguin-kernel@I-love.SAKURA.ne.jp,
        chris@chris-wilson.co.uk, longman@redhat.com, minchan@kernel.org,
        ying.huang@intel.com, mgorman@techsingularity.net, jbacik@fb.com,
        linux@roeck-us.net, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, willy@infradead.org, lirongqing@baidu.com,
        aryabinin@virtuozzo.com
Subject: Re: [PATCH v5 06/13] fs: Propagate shrinker::id to list_lru
Message-ID: <20180513165756.obsexfkvnyoylq6v@esperanza>
References: <152594582808.22949.8353313986092337675.stgit@localhost.localdomain>
 <152594598693.22949.2394903594690437296.stgit@localhost.localdomain>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <152594598693.22949.2394903594690437296.stgit@localhost.localdomain>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, May 10, 2018 at 12:53:06PM +0300, Kirill Tkhai wrote:
> The patch adds list_lru::shrinker_id field, and populates
> it by registered shrinker id.
> 
> This will be used to set correct bit in memcg shrinkers
> map by lru code in next patches, after there appeared
> the first related to memcg element in list_lru.
> 
> Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
> ---
>  fs/super.c               |    4 ++++
>  include/linux/list_lru.h |    3 +++
>  mm/list_lru.c            |    6 ++++++
>  mm/workingset.c          |    3 +++
>  4 files changed, 16 insertions(+)
> 
> diff --git a/fs/super.c b/fs/super.c
> index 2ccacb78f91c..dfa85e725e45 100644
> --- a/fs/super.c
> +++ b/fs/super.c
> @@ -258,6 +258,10 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags,
>  		goto fail;
>  	if (list_lru_init_memcg(&s->s_inode_lru))
>  		goto fail;
> +#ifdef CONFIG_MEMCG_SHRINKER
> +	s->s_dentry_lru.shrinker_id = s->s_shrink.id;
> +	s->s_inode_lru.shrinker_id = s->s_shrink.id;
> +#endif

I don't like this. Can't you simply pass struct shrinker to
list_lru_init_memcg() and let it extract the id?