Re: [PATCH] mbind.2: Add mode flag MPOL_F_NUMA_BALANCING

Re: [PATCH] mbind.2: Add mode flag MPOL_F_NUMA_BALANCING

[Alejandro Colomar]

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Hello Yafang,

On Fri, Dec 08, 2023 at 09:05:53AM +0000, Yafang Shao wrote:
> In Linux Kernel 5.12, a new mode flag, MPOL_F_NUMA_BALANCING, was
> added to set_mempolicy() to optimize the page placement among the
> NUMA nodes with the NUMA balancing mechanism even if the memory of
> the applications is bound with MPOL_BIND.
> 
> In Linux Kernel 5.15, this mode flag was extended to mbind(2). Let's
> also add man-page for mbind(2). It is copied from set_mempoicy(2)
> man-page with subtle modifications.
> 
> Related kernel commits:
> bda420b985054a3badafef23807c4b4fa38a3dff
> 6d2aec9e123bb9c49cb5c7fc654f25f81e688e8c
> 
> Suggested-by: "Huang, Ying" <ying.huang@intel.com>
> Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
> Cc: "Huang, Ying" <ying.huang@intel.com>
> Cc: Alejandro Colomar <alx.manpages@gmail.com>
> Cc: Michael Kerrisk <mtk.manpages@gmail.com>
> ---

Patch applied.

Thanks,
Alex

>  man2/mbind.2 | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/man2/mbind.2 b/man2/mbind.2
> index ba1b81ae9..dac784389 100644
> --- a/man2/mbind.2
> +++ b/man2/mbind.2
> @@ -142,6 +142,23 @@ The supported
>  .I "mode flags"
>  are:
>  .TP
> +.BR MPOL_F_NUMA_BALANCING " (since Linux 5.15)"
> +.\" commit bda420b985054a3badafef23807c4b4fa38a3dff
> +.\" commit 6d2aec9e123bb9c49cb5c7fc654f25f81e688e8c
> +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 ,
> +\-1 is returned and
> +.I errno
> +is set to
> +.BR EINVAL .
> +.TP
>  .BR MPOL_F_STATIC_NODES " (since Linux-2.6.26)"
>  A nonempty
>  .I nodemask
> -- 
> 2.30.1 (Apple Git-130)
> 

-- 
<https://www.alejandro-colomar.es/>

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