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@xxxxxxxxxx>
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@xxxxxxxxxx
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxx>
Reviewed-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxx are
mm-numa_balancing-teach-mpol_to_str-about-the-balancing-mode.patch
