[merged mm-stable] vmscan-add-a-vmscan-event-for-reclaim_pages.patch removed from -mm tree

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

The quilt patch titled
     Subject: vmscan: add a vmscan event for reclaim_pages
has been removed from the -mm tree.  Its filename was
     vmscan-add-a-vmscan-event-for-reclaim_pages.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Jaewon Kim <jaewon31.kim@samsung.com>
Subject: vmscan: add a vmscan event for reclaim_pages
Date: Fri, 11 Oct 2024 21:49:28 +0900

reclaim_folio_list uses a dummy reclaim_stat and is not being used.  To
know the memory stat, add a new trace event.  This is useful how how many
pages are not reclaimed or why.

This is an example:

mm_vmscan_reclaim_pages: nid=0 nr_scanned=112 nr_reclaimed=112 nr_dirty=0 nr_writeback=0 nr_congested=0 nr_immediate=0 nr_activate_anon=0 nr_activate_file=0 nr_ref_keep=0 nr_unmap_fail=0

Currently reclaim_folio_list is only called by reclaim_pages, and
reclaim_pages is used by damon and madvise.  In the latest Android,
reclaim_pages is also used by shmem to reclaim all pages in a
address_space.

[jaewon31.kim@samsung.com: use sc.nr_scanned rather than new counting]
  Link: https://lkml.kernel.org/r/20241016143227.961162-1-jaewon31.kim@samsung.com
Link: https://lkml.kernel.org/r/20241011124928.1224813-1-jaewon31.kim@samsung.com
Signed-off-by: Jaewon Kim <jaewon31.kim@samsung.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Jaewon Kim <jaewon31.kim@samsung.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/trace/events/vmscan.h |   45 ++++++++++++++++++++++++++++++++
 mm/vmscan.c                   |    5 ++-
 2 files changed, 48 insertions(+), 2 deletions(-)

--- a/include/trace/events/vmscan.h~vmscan-add-a-vmscan-event-for-reclaim_pages
+++ a/include/trace/events/vmscan.h
@@ -346,6 +346,51 @@ TRACE_EVENT(mm_vmscan_write_folio,
 		show_reclaim_flags(__entry->reclaim_flags))
 );
 
+TRACE_EVENT(mm_vmscan_reclaim_pages,
+
+	TP_PROTO(int nid,
+		unsigned long nr_scanned, unsigned long nr_reclaimed,
+		struct reclaim_stat *stat),
+
+	TP_ARGS(nid, nr_scanned, nr_reclaimed, stat),
+
+	TP_STRUCT__entry(
+		__field(int, nid)
+		__field(unsigned long, nr_scanned)
+		__field(unsigned long, nr_reclaimed)
+		__field(unsigned long, nr_dirty)
+		__field(unsigned long, nr_writeback)
+		__field(unsigned long, nr_congested)
+		__field(unsigned long, nr_immediate)
+		__field(unsigned int, nr_activate0)
+		__field(unsigned int, nr_activate1)
+		__field(unsigned long, nr_ref_keep)
+		__field(unsigned long, nr_unmap_fail)
+	),
+
+	TP_fast_assign(
+		__entry->nid = nid;
+		__entry->nr_scanned = nr_scanned;
+		__entry->nr_reclaimed = nr_reclaimed;
+		__entry->nr_dirty = stat->nr_dirty;
+		__entry->nr_writeback = stat->nr_writeback;
+		__entry->nr_congested = stat->nr_congested;
+		__entry->nr_immediate = stat->nr_immediate;
+		__entry->nr_activate0 = stat->nr_activate[0];
+		__entry->nr_activate1 = stat->nr_activate[1];
+		__entry->nr_ref_keep = stat->nr_ref_keep;
+		__entry->nr_unmap_fail = stat->nr_unmap_fail;
+	),
+
+	TP_printk("nid=%d nr_scanned=%ld nr_reclaimed=%ld nr_dirty=%ld nr_writeback=%ld nr_congested=%ld nr_immediate=%ld nr_activate_anon=%d nr_activate_file=%d nr_ref_keep=%ld nr_unmap_fail=%ld",
+		__entry->nid,
+		__entry->nr_scanned, __entry->nr_reclaimed,
+		__entry->nr_dirty, __entry->nr_writeback,
+		__entry->nr_congested, __entry->nr_immediate,
+		__entry->nr_activate0, __entry->nr_activate1,
+		__entry->nr_ref_keep, __entry->nr_unmap_fail)
+);
+
 TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
 
 	TP_PROTO(int nid,
--- a/mm/vmscan.c~vmscan-add-a-vmscan-event-for-reclaim_pages
+++ a/mm/vmscan.c
@@ -2129,7 +2129,7 @@ static void shrink_active_list(unsigned
 static unsigned int reclaim_folio_list(struct list_head *folio_list,
 				      struct pglist_data *pgdat)
 {
-	struct reclaim_stat dummy_stat;
+	struct reclaim_stat stat;
 	unsigned int nr_reclaimed;
 	struct folio *folio;
 	struct scan_control sc = {
@@ -2140,12 +2140,13 @@ static unsigned int reclaim_folio_list(s
 		.no_demotion = 1,
 	};
 
-	nr_reclaimed = shrink_folio_list(folio_list, pgdat, &sc, &dummy_stat, true);
+	nr_reclaimed = shrink_folio_list(folio_list, pgdat, &sc, &stat, true);
 	while (!list_empty(folio_list)) {
 		folio = lru_to_folio(folio_list);
 		list_del(&folio->lru);
 		folio_putback_lru(folio);
 	}
+	trace_mm_vmscan_reclaim_pages(pgdat->node_id, sc.nr_scanned, nr_reclaimed, &stat);
 
 	return nr_reclaimed;
 }
_

Patches currently in -mm which might be from jaewon31.kim@samsung.com are