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Subject: Re: [PATCH] mm: fix comments related to node reclaim
To:     Hao Lee <haolee.swjtu@gmail.com>, akpm@linux-foundation.org
Cc:     mgorman@techsingularity.net, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
References: <20191125142018.GA21373@haolee.github.io>
From:   Anshuman Khandual <anshuman.khandual@arm.com>
Message-ID: <cf85d546-3b6c-e172-3624-0e40e0f7699c@arm.com>
Date:   Tue, 26 Nov 2019 15:13:22 +0530
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On 11/25/2019 07:50 PM, Hao Lee wrote:
> As zone reclaim has been replaced by node reclaim, this patch fixes related
> comments.
> 
> Signed-off-by: Hao Lee <haolee.swjtu@gmail.com>
> ---
>  include/linux/mmzone.h          | 2 +-
>  include/uapi/linux/capability.h | 2 +-
>  include/uapi/linux/sysctl.h     | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 9e47289a4511..7e3208f4f5bc 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -747,7 +747,7 @@ typedef struct pglist_data {
>  
>  #ifdef CONFIG_NUMA
>  	/*
> -	 * zone reclaim becomes active if more unmapped pages exist.
> +	 * node reclaim becomes active if more unmapped pages exist.
>  	 */
>  	unsigned long		min_unmapped_pages;
>  	unsigned long		min_slab_pages;
> diff --git a/include/uapi/linux/capability.h b/include/uapi/linux/capability.h
> index 240fdb9a60f6..dd6772f16eec 100644
> --- a/include/uapi/linux/capability.h
> +++ b/include/uapi/linux/capability.h
> @@ -273,7 +273,7 @@ struct vfs_ns_cap_data {
>  /* Allow enabling/disabling tagged queuing on SCSI controllers and sending
>     arbitrary SCSI commands */
>  /* Allow setting encryption key on loopback filesystem */
> -/* Allow setting zone reclaim policy */
> +/* Allow setting node reclaim policy */

Does this point to the capability for accessing vm.zone_reclaim_mode = 0
sysctl knob ? In that case we should not be changing the name here as the
interface still retains the original name 'zone_reclaim_mode'.

>  
>  #define CAP_SYS_ADMIN        21
>  
> diff --git a/include/uapi/linux/sysctl.h b/include/uapi/linux/sysctl.h
> index 87aa2a6d9125..27c1ed2822e6 100644
> --- a/include/uapi/linux/sysctl.h
> +++ b/include/uapi/linux/sysctl.h
> @@ -195,7 +195,7 @@ enum
>  	VM_MIN_UNMAPPED=32,	/* Set min percent of unmapped pages */
>  	VM_PANIC_ON_OOM=33,	/* panic at out-of-memory */
>  	VM_VDSO_ENABLED=34,	/* map VDSO into new processes? */
> -	VM_MIN_SLAB=35,		 /* Percent pages ignored by zone reclaim */
> +	VM_MIN_SLAB=35,		 /* Percent pages ignored by node reclaim */
>  };
>  
>  
>