linux-kernel - Re: [PATCH -V9 2/3] NOT kernel/man2/set_mempolicy.2: Add mode flag MPOL_F_NUMA

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Date:   Thu, 21 Jan 2021 21:39:40 +0100
From:   "Alejandro Colomar (man-pages)" <alx.manpages@...il.com>
To:     Huang Ying <ying.huang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>,
        "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -V9 2/3] NOT kernel/man2/set_mempolicy.2: Add mode flag
 MPOL_F_NUMA_BALANCING

Hi Huang Ying,

On 1/20/21 7:12 AM, Huang Ying wrote:
> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
> Cc: "Alejandro Colomar" <alx.mailinglists@...il.com>

Sorry, for the confusion.
I have a different email for reading lists.
I use alx.manpages@ for everything,
and alx.mailinglists@ just for reading lists, but sometimes,
when I answer emails not sent to me,
I forget to change the reply address,
and you see that address (which I intended to be readonly).

Please, use alx.manpages@...il.com,
or your mail might get lost between many list emails ;)

> ---
>  man2/set_mempolicy.2 | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/man2/set_mempolicy.2 b/man2/set_mempolicy.2
> index 68011eecb..fa64a1820 100644
> --- a/man2/set_mempolicy.2
> +++ b/man2/set_mempolicy.2
> @@ -113,6 +113,22 @@ A nonempty
>  .I nodemask
>  specifies node IDs that are relative to the set of
>  node IDs allowed by the process's current cpuset.
> +.TP
> +.BR MPOL_F_NUMA_BALANCING " (since Linux 5.12)"
> +When
> +.I mode
> +is
> +.BR MPOL_BIND ,
> +enable the kernel NUMA balancing for the task if it is supported by
> +the kernel.
> +If the flag isn't supported by the kernel, or is used with
> +.I mode
> +other than
> +.BR MPOL_BIND ,
> +return \-1 and
> +.I errno
> +is set to
> +.BR EINVAL .

The wording here is a bit weird:
[return // is set].  It would be better as
[return // set] or [returns // sets] or [is returned // is set].

The same page, has:

[
RETURN VALUE
       On success, set_mempolicy() returns 0; on error, -1 is  re‐
       turned and errno is set to indicate the error.
]

so I'd use the latter for consistency.

>  .PP
>  .I nodemask
>  points to a bit mask of node IDs that contains up to
> @@ -293,6 +309,12 @@ argument specified both
>  .B MPOL_F_STATIC_NODES
>  and
>  .BR MPOL_F_RELATIVE_NODES .
> +Or, the
> +.B MPOL_F_NUMA_BALANCING
> +isn't supported by the kernel, or is used with
> +.I mode
> +other than
> +.BR MPOL_BIND .
>  .TP
>  .B ENOMEM
>  Insufficient kernel memory was available.
> 

Other than that, it's good for me.

Thanks,

Alex

Just a reminder for myself (please ignore it):
- Break EINVAL into multiple paragraphs.
- (Maybe) reorder lists to be in alphabetical order.

-- 
Alejandro Colomar
Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/
http://www.alejandro-colomar.es/