linux-kernel - Re: [PATCH -V6 RESEND 2/3] NOT kernel/man-pages: man2/set_mempolicy.2: Add mode flag MPOL_F_NUMA

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Date:   Wed, 2 Dec 2020 13:33:13 +0100
From:   "Alejandro Colomar (mailing lists; readonly)" 
        <alx.mailinglists@...il.com>
To:     Huang Ying <ying.huang@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Mel Gorman <mgorman@...e.de>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Rafael Aquini <aquini@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        Rik van Riel <riel@...riel.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Michal Hocko <mhocko@...e.com>,
        David Rientjes <rientjes@...gle.com>, linux-api@...r.kernel.org
Subject: Re: [PATCH -V6 RESEND 2/3] NOT kernel/man-pages:
 man2/set_mempolicy.2: Add mode flag MPOL_F_NUMA_BALANCING

Hi Huang Ying,

Please see a few fixes below.

Michael, as always, some question for you too ;)

Thanks,

Alex

On 12/2/20 9:42 AM, Huang Ying wrote:
> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
> ---
>  man2/set_mempolicy.2 | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/man2/set_mempolicy.2 b/man2/set_mempolicy.2
> index 68011eecb..3754b3e12 100644
> --- a/man2/set_mempolicy.2
> +++ b/man2/set_mempolicy.2
> @@ -113,6 +113,12 @@ 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 5.11)"

I'd prefer it to be in alphabetical order (rather than just adding at
the bottom).

That way, when lists grow, it's easier to find things.

> +Enable the Linux kernel NUMA balancing for the task if it is supported
> +by kernel.

I'd s/Linux kernel/kernel/ when it doesn't specifically refer to the
Linux kernel to differentiate it from other kernels.  It only adds noise
(IMHO).  mtk?

wfix:

... supported by _the_ kernel.

> +If the flag isn't supported by Linux kernel, return -1 and errno is

wfix:

If the flag isn't supported by _the_ kernel, ...

> +set to EINVAL.

errno and EINVAL should use .I and .B respectively

>  .PP
>  .I nodemask
>  points to a bit mask of node IDs that contains up to
> @@ -293,6 +299,9 @@ 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 Linux kernel.
>  .TP
>  .B ENOMEM
>  Insufficient kernel memory was available.
>