linux-kernel - [PATCH -V7 2/3] NOT kernel/man2/set_mempolicy.2: Add mode flag MPOL_F_NUMA

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Message-Id: <20201204091534.72239-3-ying.huang@intel.com>
Date:   Fri,  4 Dec 2020 17:15:33 +0800
From:   Huang Ying <ying.huang@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>, Mel Gorman <mgorman@...e.de>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Huang Ying <ying.huang@...el.com>,
        "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: [PATCH -V7 2/3] NOT kernel/man2/set_mempolicy.2: Add mode flag MPOL_F_NUMA_BALANCING

Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
---
 man2/set_mempolicy.2 | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/man2/set_mempolicy.2 b/man2/set_mempolicy.2
index 68011eecb..fb2e6fd96 100644
--- a/man2/set_mempolicy.2
+++ b/man2/set_mempolicy.2
@@ -113,6 +113,15 @@ 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)"
+When
+.I mode
+is MPOL_BIND, enable the Linux kernel NUMA balancing for the task if
+it is supported by kernel.
+If the flag isn't supported by Linux kernel, or is used with
+.I mode
+other than MPOL_BIND, 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 +302,11 @@ 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, or is used with
+.I mode
+other than MPOL_BIND.
 .TP
 .B ENOMEM
 Insufficient kernel memory was available.
-- 
2.29.2