linux-kernel - Re: [PATCH 2/2] sysctl: remove /proc/sys/vm/nr_pdflush

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Message-ID: <20171004072055.GO11879@quack2.suse.cz>
Date:   Wed, 4 Oct 2017 09:20:55 +0200
From:   Jan Kara <jack@...e.cz>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        hannes@...xchg.org, jack@...e.cz
Subject: Re: [PATCH 2/2] sysctl: remove /proc/sys/vm/nr_pdflush_threads

On Tue 03-10-17 09:16:21, Jens Axboe wrote:
> This tunable has been obsolete since 2.6.32, and writes to the
> file have been failing and complaining in dmesg since then:
> 
> nr_pdflush_threads exported in /proc is scheduled for removal
> 
> That was 8 years ago. Remove the file ABI obsolete notice, and
> the sysfs file.
> 
> Signed-off-by: Jens Axboe <axboe@...nel.dk>

Agreed. You can add:

Reviewed-by: Jan Kara <jack@...e.cz>

							Honza


> ---
>  Documentation/ABI/obsolete/proc-sys-vm-nr_pdflush_threads | 5 -----
>  kernel/sysctl.c                                           | 5 -----
>  2 files changed, 10 deletions(-)
>  delete mode 100644 Documentation/ABI/obsolete/proc-sys-vm-nr_pdflush_threads
> 
> diff --git a/Documentation/ABI/obsolete/proc-sys-vm-nr_pdflush_threads b/Documentation/ABI/obsolete/proc-sys-vm-nr_pdflush_threads
> deleted file mode 100644
> index b0b0eeb20fe3..000000000000
> --- a/Documentation/ABI/obsolete/proc-sys-vm-nr_pdflush_threads
> +++ /dev/null
> @@ -1,5 +0,0 @@
> -What:		/proc/sys/vm/nr_pdflush_threads
> -Date:		June 2012
> -Contact:	Wanpeng Li <liwp@...ux.vnet.ibm.com>
> -Description: Since pdflush is replaced by per-BDI flusher, the interface of old pdflush
> -             exported in /proc/sys/vm/ should be removed.
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 6648fbbb8157..a5dd8d82c253 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -1345,11 +1345,6 @@ static struct ctl_table vm_table[] = {
>  		.extra1		= &zero,
>  	},
>  	{
> -		.procname       = "nr_pdflush_threads",
> -		.mode           = 0444 /* read-only */,
> -		.proc_handler   = pdflush_proc_obsolete,
> -	},
> -	{
>  		.procname	= "swappiness",
>  		.data		= &vm_swappiness,
>  		.maxlen		= sizeof(vm_swappiness),
> -- 
> 2.7.4
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR