+ mm-numa_balancing-teach-mpol_to_str-about-the-balancing-mode.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/numa_balancing: teach mpol_to_str about the balancing mode
has been added to the -mm mm-unstable branch.  Its filename is
     mm-numa_balancing-teach-mpol_to_str-about-the-balancing-mode.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-numa_balancing-teach-mpol_to_str-about-the-balancing-mode.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Subject: mm/numa_balancing: teach mpol_to_str about the balancing mode
Date: Tue, 25 Jun 2024 14:26:05 +0100

If a task has had MPOL_F_NUMA_BALANCING set it is useful to show that in
procfs.  Teach the mpol_to_str() helper about its existence and while at
it update the comment to account for "weighted interleave" when suggesting
a recommended buffer size.

Link: https://lkml.kernel.org/r/20240625132605.38428-1-tursulin@igalia.com
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mempolicy.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

--- a/mm/mempolicy.c~mm-numa_balancing-teach-mpol_to_str-about-the-balancing-mode
+++ a/mm/mempolicy.c
@@ -3297,8 +3297,9 @@ out:
  * @pol:  pointer to mempolicy to be formatted
  *
  * Convert @pol into a string.  If @buffer is too short, truncate the string.
- * Recommend a @maxlen of at least 32 for the longest mode, "interleave", the
- * longest flag, "relative", and to display at least a few node ids.
+ * Recommend a @maxlen of at least 42 for the longest mode, "weighted
+ * interleave", the longest flag, "balancing", and to display at least a few
+ * node ids.
  */
 void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
 {
@@ -3335,12 +3336,15 @@ void mpol_to_str(char *buffer, int maxle
 		p += snprintf(p, buffer + maxlen - p, "=");
 
 		/*
-		 * Currently, the only defined flags are mutually exclusive
+		 * The below two flags are mutually exclusive:
 		 */
 		if (flags & MPOL_F_STATIC_NODES)
 			p += snprintf(p, buffer + maxlen - p, "static");
 		else if (flags & MPOL_F_RELATIVE_NODES)
 			p += snprintf(p, buffer + maxlen - p, "relative");
+
+		if (flags & MPOL_F_NUMA_BALANCING)
+			p += snprintf(p, buffer + maxlen - p, "balancing");
 	}
 
 	if (!nodes_empty(nodes))
_

Patches currently in -mm which might be from tvrtko.ursulin@igalia.com are

mm-numa_balancing-teach-mpol_to_str-about-the-balancing-mode.patch