+ mm-added-node_reclaim-successes-to-vm-event-counters.patch added to mm-unstable branch

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

The patch titled
     Subject: mm: add node_reclaim successes to VM event counters
has been added to the -mm mm-unstable branch.  Its filename is
     mm-added-node_reclaim-successes-to-vm-event-counters.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-added-node_reclaim-successes-to-vm-event-counters.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: Matthew Cassell <mcassell411@gmail.com>
Subject: mm: add node_reclaim successes to VM event counters
Date: Mon, 22 Jul 2024 17:13:16 +0000

/proc/vmstat currently shows the number of node_reclaim() failures when
vm.zone_reclaim_mode is set appropriately.  It would be convenient to have
the number of successes right next to zone_reclaim_failed (similar to
compaction and migration).

While just a trivially addition to the vmstat file.  It was helpful during
benchmarking to not have to probe node_reclaim() to observe the
success/failure ratio.

Link: https://lkml.kernel.org/r/20240722171316.7517-1-mcassell411@gmail.com
Signed-off-by: Matthew Cassell <mcassell411@gmail.com>
Cc: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Li Zhijian <lizhijian@fujitsu.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/vm_event_item.h |    1 +
 mm/vmscan.c                   |    4 +++-
 mm/vmstat.c                   |    1 +
 3 files changed, 5 insertions(+), 1 deletion(-)

--- a/include/linux/vm_event_item.h~mm-added-node_reclaim-successes-to-vm-event-counters
+++ a/include/linux/vm_event_item.h
@@ -50,6 +50,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS
 		PGSTEAL_ANON,
 		PGSTEAL_FILE,
 #ifdef CONFIG_NUMA
+		PGSCAN_ZONE_RECLAIM_SUCCESS,
 		PGSCAN_ZONE_RECLAIM_FAILED,
 #endif
 		PGINODESTEAL, SLABS_SCANNED, KSWAPD_INODESTEAL,
--- a/mm/vmscan.c~mm-added-node_reclaim-successes-to-vm-event-counters
+++ a/mm/vmscan.c
@@ -7548,7 +7548,9 @@ int node_reclaim(struct pglist_data *pgd
 	ret = __node_reclaim(pgdat, gfp_mask, order);
 	clear_bit(PGDAT_RECLAIM_LOCKED, &pgdat->flags);
 
-	if (!ret)
+	if (ret)
+		count_vm_event(PGSCAN_ZONE_RECLAIM_SUCCESS);
+	else
 		count_vm_event(PGSCAN_ZONE_RECLAIM_FAILED);
 
 	return ret;
--- a/mm/vmstat.c~mm-added-node_reclaim-successes-to-vm-event-counters
+++ a/mm/vmstat.c
@@ -1296,6 +1296,7 @@ const char * const vmstat_text[] = {
 	"pgsteal_file",
 
 #ifdef CONFIG_NUMA
+	"zone_reclaim_success",
 	"zone_reclaim_failed",
 #endif
 	"pginodesteal",
_

Patches currently in -mm which might be from mcassell411@gmail.com are

mm-added-node_reclaim-successes-to-vm-event-counters.patch