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

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Message-Id: <6FE62F56-1B4E-4E2A-BEA9-0DA6907A2FA9@linux.dev>
Date:   Tue, 25 Jul 2023 11:23:54 +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 25, 2023, at 11:09, Qi Zheng <zhengqi.arch@...edance.com> wrote:
> 
> 
> 
> On 2023/7/25 10:35, Muchun Song wrote:
>>> 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.
> 
> How about putting them in the mm/internal.h file?

Either is fine to me.

> 
>> Thanks.