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@xxxxxxxxx>
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@xxxxxxxxx
Signed-off-by: Matthew Cassell <mcassell411@xxxxxxxxx>
Cc: Domenico Cerasuolo <cerasuolodomenico@xxxxxxxxx>
Cc: "Huang, Ying" <ying.huang@xxxxxxxxx>
Cc: Li Zhijian <lizhijian@xxxxxxxxxxx>
Cc: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxx are
mm-added-node_reclaim-successes-to-vm-event-counters.patch
