linux-ext4 - Re: [PATCH v2 17/47] rcu: dynamically allocate the rcu-lazy shrinker

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Date:   Wed, 26 Jul 2023 17:24:58 +0800
From:   Qi Zheng <zhengqi.arch@...edance.com>
To:     Muchun Song <muchun.song@...ux.dev>
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, senozhatsky@...omium.org,
        yujie.liu@...el.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, 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@...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 17/47] rcu: dynamically allocate the rcu-lazy shrinker



On 2023/7/26 15:04, Muchun Song wrote:
> 
> 
>> On Jul 24, 2023, at 17:43, Qi Zheng <zhengqi.arch@...edance.com> wrote:
>>
>> Use new APIs to dynamically allocate the rcu-lazy shrinker.
>>
>> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
>> ---
>> kernel/rcu/tree_nocb.h | 19 +++++++++++--------
>> 1 file changed, 11 insertions(+), 8 deletions(-)
>>
>> diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h
>> index 43229d2b0c44..919f17561733 100644
>> --- a/kernel/rcu/tree_nocb.h
>> +++ b/kernel/rcu/tree_nocb.h
>> @@ -1397,12 +1397,7 @@ lazy_rcu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
>> return count ? count : SHRINK_STOP;
>> }
>>
>> -static struct shrinker lazy_rcu_shrinker = {
>> -	.count_objects = lazy_rcu_shrink_count,
>> -	.scan_objects = lazy_rcu_shrink_scan,
>> -	.batch = 0,
>> -	.seeks = DEFAULT_SEEKS,
>> -};
>> +static struct shrinker *lazy_rcu_shrinker;
> 
> Seems there is no users of this variable, maybe we could drop
> this.

Yeah, will change it to a local variable. And the patch #15 is
the same.

>