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SubjectRe: [PATCH -V9 2/3] NOT kernel/man2/set_mempolicy.2: Add mode flag MPOL_F_NUMA_BALANCING
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Hi Huang Ying,

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

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