linux-kernel - Re: [PATCH v3 22/49] sunrpc: dynamically allocate the sunrpc

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Message-ID: <1eb30b9e-c43b-b81e-4d96-5d6fa4f2894a@bytedance.com>
Date:   Thu, 27 Jul 2023 17:10:57 +0800
From:   Qi Zheng <zhengqi.arch@...edance.com>
To:     akpm@...ux-foundation.org, david@...morbit.com, tkhai@...ru,
        vbabka@...e.cz, roman.gushchin@...ux.dev, djwong@...nel.org,
        brauner@...nel.org, paulmck@...nel.org, tytso@....edu,
        steven.price@....com, cel@...nel.org, senozhatsky@...omium.org,
        yujie.liu@...el.com, gregkh@...uxfoundation.org,
        muchun.song@...ux.dev
Cc:     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,
        Muchun Song <songmuchun@...edance.com>
Subject: Re: [PATCH v3 22/49] sunrpc: dynamically allocate the sunrpc_cred
 shrinker



On 2023/7/27 16:04, Qi Zheng wrote:
> Use new APIs to dynamically allocate the sunrpc_cred shrinker.
> 
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
> Reviewed-by: Muchun Song <songmuchun@...edance.com>
> ---
>   net/sunrpc/auth.c | 19 +++++++++++--------
>   1 file changed, 11 insertions(+), 8 deletions(-)
> 
> diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
> index 2f16f9d17966..6b898b1be6f5 100644
> --- a/net/sunrpc/auth.c
> +++ b/net/sunrpc/auth.c
> @@ -861,11 +861,7 @@ rpcauth_uptodatecred(struct rpc_task *task)
>   		test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0;
>   }
>   
> -static struct shrinker rpc_cred_shrinker = {
> -	.count_objects = rpcauth_cache_shrink_count,
> -	.scan_objects = rpcauth_cache_shrink_scan,
> -	.seeks = DEFAULT_SEEKS,
> -};
> +static struct shrinker *rpc_cred_shrinker;
>   
>   int __init rpcauth_init_module(void)
>   {
> @@ -874,9 +870,16 @@ int __init rpcauth_init_module(void)
>   	err = rpc_init_authunix();
>   	if (err < 0)
>   		goto out1;
> -	err = register_shrinker(&rpc_cred_shrinker, "sunrpc_cred");
> -	if (err < 0)
> +	rpc_cred_shrinker = shrinker_alloc(0, "sunrpc_cred");
> +	if (!rpc_cred_shrinker)

Here should set err to -ENOMEM, will fix.

>   		goto out2;
> +
> +	rpc_cred_shrinker->count_objects = rpcauth_cache_shrink_count;
> +	rpc_cred_shrinker->scan_objects = rpcauth_cache_shrink_scan;
> +	rpc_cred_shrinker->seeks = DEFAULT_SEEKS;
> +
> +	shrinker_register(rpc_cred_shrinker);
> +
>   	return 0;
>   out2:
>   	rpc_destroy_authunix();
> @@ -887,5 +890,5 @@ int __init rpcauth_init_module(void)
>   void rpcauth_remove_module(void)
>   {
>   	rpc_destroy_authunix();
> -	unregister_shrinker(&rpc_cred_shrinker);
> +	shrinker_free(rpc_cred_shrinker);
>   }