linux-kernel - Re: [PATCH v2 01/47] mm: vmscan: move shrinker-related code into a separate file

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Message-Id: <97E80C37-8872-4C5A-A027-A0B35F39152A@linux.dev>
Date:   Tue, 25 Jul 2023 10:35:01 +0800
From:   Muchun Song <muchun.song@...ux.dev>
To:     Qi Zheng <zhengqi.arch@...edance.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, david@...morbit.com,
        tkhai@...ru, Vlastimil Babka <vbabka@...e.cz>,
        Roman Gushchin <roman.gushchin@...ux.dev>, djwong@...nel.org,
        Christian Brauner <brauner@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>, tytso@....edu,
        steven.price@....com, cel@...nel.org,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        yujie.liu@...el.com, Greg KH <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        x86@...nel.org, kvm@...r.kernel.org,
        xen-devel@...ts.xenproject.org, linux-erofs@...ts.ozlabs.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-nfs@...r.kernel.org, linux-mtd@...ts.infradead.org,
        rcu@...r.kernel.org, netdev <netdev@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        dm-devel@...hat.com, linux-raid@...r.kernel.org,
        linux-bcache@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: Re: [PATCH v2 01/47] mm: vmscan: move shrinker-related code into a
 separate file



> On Jul 24, 2023, at 17:43, Qi Zheng <zhengqi.arch@...edance.com> wrote:
> 
> The mm/vmscan.c file is too large, so separate the shrinker-related
> code from it into a separate file. No functional changes.
> 
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
> ---
> include/linux/shrinker.h |   3 +
> mm/Makefile              |   4 +-
> mm/shrinker.c            | 707 +++++++++++++++++++++++++++++++++++++++
> mm/vmscan.c              | 701 --------------------------------------
> 4 files changed, 712 insertions(+), 703 deletions(-)
> create mode 100644 mm/shrinker.c
> 
> diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h
> index 224293b2dd06..961cb84e51f5 100644
> --- a/include/linux/shrinker.h
> +++ b/include/linux/shrinker.h
> @@ -96,6 +96,9 @@ struct shrinker {
>  */
> #define SHRINKER_NONSLAB (1 << 3)
> 
> +unsigned long shrink_slab(gfp_t gfp_mask, int nid, struct mem_cgroup *memcg,
> +			   int priority);

A good cleanup, vmscan.c is so huge.

I'd like to introduce a new header in mm/ directory and contains those
declarations of functions (like this and other debug function in
shrinker_debug.c) since they are used internally across mm.

Thanks.