From: Mel Gorman <mgorman@suse.de>
To: Huang Ying <ying.huang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
"Matthew Wilcox (Oracle)" <willy@infradead.org>,
Rafael Aquini <aquini@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@redhat.com>, Rik van Riel <riel@surriel.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Dave Hansen <dave.hansen@intel.com>,
Andi Kleen <ak@linux.intel.com>, Michal Hocko <mhocko@suse.com>,
David Rientjes <rientjes@google.com>,
linux-api@vger.kernel.org
Subject: Re: [PATCH -V6 RESEND 2/3] NOT kernel/man-pages: man2/set_mempolicy.2: Add mode flag MPOL_F_NUMA_BALANCING
Date: Wed, 2 Dec 2020 11:43:57 +0000 [thread overview]
Message-ID: <20201202114357.GW3306@suse.de> (raw)
In-Reply-To: <20201202084234.15797-3-ying.huang@intel.com>
On Wed, Dec 02, 2020 at 04:42:33PM +0800, Huang Ying wrote:
> Signed-off-by: "Huang, Ying" <ying.huang@intel.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)"
> +Enable the Linux kernel NUMA balancing for the task if it is supported
> +by kernel.
> +If the flag isn't supported by Linux kernel, return -1 and errno is
> +set to EINVAL.
> .PP
> .I nodemask
> points to a bit mask of node IDs that contains up to
> @@ -293,6 +299,9 @@ argument specified both
Should this be expanded more to clarify it applies to MPOL_BIND
specifically?
Maybe the first patch should be expanded more and explictly fail if
MPOL_F_NUMA_BALANCING is used with anything other than MPOL_BIND?
> .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.
This will be difficult for an app to distinguish but we can't go back in
time and make this ENOSYS :(
The linux-api people might have more guidance but it may go to the
extent of including a small test program in the manual page for a
sequence that tests whether MPOL_F_NUMA_BALANCING works. They might have
a better recommendation on how it should be handled.
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2020-12-02 11:44 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-02 8:42 [PATCH -V6 RESEND 0/3] numa balancing: Migrate on fault among multiple bound nodes Huang Ying
2020-12-02 8:42 ` [PATCH -V6 RESEND 1/3] " Huang Ying
2020-12-02 11:40 ` Mel Gorman
2020-12-03 10:25 ` Peter Zijlstra
2020-12-03 10:53 ` Mel Gorman
2020-12-04 9:19 ` Huang, Ying
2020-12-10 8:21 ` Huang, Ying
2020-12-02 8:42 ` [PATCH -V6 RESEND 2/3] NOT kernel/man-pages: man2/set_mempolicy.2: Add mode flag MPOL_F_NUMA_BALANCING Huang Ying
2020-12-02 11:43 ` Mel Gorman [this message]
2020-12-03 1:49 ` Huang, Ying
2020-12-03 9:37 ` Mel Gorman
2020-12-02 12:33 ` Alejandro Colomar (mailing lists; readonly)
2020-12-08 8:13 ` Huang, Ying
2020-12-18 10:21 ` Alejandro Colomar (mailing lists; readonly)
2020-12-21 1:31 ` Huang, Ying
2020-12-02 8:42 ` [PATCH -V6 RESEND 3/3] NOT kernel/numactl: Support to enable Linux kernel NUMA balancing Huang Ying
2020-12-02 11:45 ` Mel Gorman
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