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Message-Id: <20231020084358.463846-2-link@vivo.com>
Date: Fri, 20 Oct 2023 16:43:50 +0800
From: Huan Yang <link@...o.com>
To: Yu Zhao <yuzhao@...gle.com>, Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Huan Yang <link@...o.com>,
Suren Baghdasaryan <surenb@...gle.com>,
Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org, linux-mm@...ck.org
Cc: opensource.kernel@...o.com
Subject: [PATCH 1/2] tracing: mm: multigen-lru: fix mglru trace
This patch add reclaim stat:
nr_promote: nr_pages shrink before promote by folio_update_gen.
And then, use correct nr_scanned which evict_folios passed into
trace_mm_vmscan_lru_shrink_inactive.
Mistake info like this:
```
kswapd0-89 [000] 64.887613: mm_vmscan_lru_shrink_inactive:
nid=0 nr_scanned=64 nr_reclaimed=0 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 priority=4
flags=RECLAIM_WB_FILE|RECLAIM_WB_ASYNC
```
Correct info like this:
```
<...>-9041 [006] 43.738481: mm_vmscan_lru_shrink_inactive:
nid=0 nr_scanned=13 nr_reclaimed=0 nr_dirty=0 nr_writeback=0
nr_congested=0 nr_immediate=0 nr_activate_anon=9 nr_activate_file=0
nr_ref_keep=0 nr_unmap_fail=0 nr_promote=4 priority=12
flags=RECLAIM_WB_ANON|RECLAIM_WB_ASYNC
```
Signed-off-by: Huan Yang <link@...o.com>
---
include/linux/vmstat.h | 1 +
include/trace/events/vmscan.h | 7 +++++--
mm/vmscan.c | 25 ++++++++++++++++++++-----
3 files changed, 26 insertions(+), 7 deletions(-)
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index fed855bae6d8..a3710ce08434 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -32,6 +32,7 @@ struct reclaim_stat {
unsigned nr_ref_keep;
unsigned nr_unmap_fail;
unsigned nr_lazyfree_fail;
+ unsigned nr_promote;
};
enum writeback_stat_item {
diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index 1a488c30afa5..ffcf288879e0 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -366,6 +366,7 @@ TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
__field(unsigned int, nr_activate1)
__field(unsigned long, nr_ref_keep)
__field(unsigned long, nr_unmap_fail)
+ __field(unsigned long, nr_promote)
__field(int, priority)
__field(int, reclaim_flags)
),
@@ -382,18 +383,20 @@ TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
__entry->nr_activate1 = stat->nr_activate[1];
__entry->nr_ref_keep = stat->nr_ref_keep;
__entry->nr_unmap_fail = stat->nr_unmap_fail;
+ __entry->nr_promote = stat->nr_promote;
__entry->priority = priority;
__entry->reclaim_flags = trace_reclaim_flags(file);
),
- 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 priority=%d flags=%s",
+ 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 nr_promote=%ld priority=%d flags=%s",
__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,
- __entry->priority,
+ __entry->nr_promote, __entry->priority,
show_reclaim_flags(__entry->reclaim_flags))
);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 2cc0cb41fb32..fb5df298c955 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1063,8 +1063,10 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
/* folio_update_gen() tried to promote this page? */
if (lru_gen_enabled() && !ignore_references &&
- folio_mapped(folio) && folio_test_referenced(folio))
+ folio_mapped(folio) && folio_test_referenced(folio)) {
+ stat->nr_promote += nr_pages;
goto keep_locked;
+ }
/*
* The number of dirty pages determines if a node is marked
@@ -4495,6 +4497,8 @@ static int evict_folios(struct lruvec *lruvec, struct scan_control *sc, int swap
int type;
int scanned;
int reclaimed;
+ unsigned long nr_taken = sc->nr_scanned;
+ unsigned int total_reclaimed = 0;
LIST_HEAD(list);
LIST_HEAD(clean);
struct folio *folio;
@@ -4521,10 +4525,7 @@ static int evict_folios(struct lruvec *lruvec, struct scan_control *sc, int swap
return scanned;
retry:
reclaimed = shrink_folio_list(&list, pgdat, sc, &stat, false);
- sc->nr_reclaimed += reclaimed;
- trace_mm_vmscan_lru_shrink_inactive(pgdat->node_id,
- scanned, reclaimed, &stat, sc->priority,
- type ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON);
+ total_reclaimed += reclaimed;
list_for_each_entry_safe_reverse(folio, next, &list, lru) {
if (!folio_evictable(folio)) {
@@ -4582,6 +4583,20 @@ static int evict_folios(struct lruvec *lruvec, struct scan_control *sc, int swap
goto retry;
}
+ /**
+ * MGLRU scan_folios return nr_scanned no only contains
+ * isolated folios. To get actually touched folios in
+ * shrink_folios_list, we can record last nr_scanned which
+ * sc saved, and sc nr_scanned will update for each folios
+ * which we touched. New count sub last can get right nr_taken
+ */
+ nr_taken = sc->nr_scanned - nr_taken;
+
+ sc->nr_reclaimed += total_reclaimed;
+ trace_mm_vmscan_lru_shrink_inactive(pgdat->node_id, nr_taken,
+ total_reclaimed, &stat,
+ sc->priority, type);
+
return scanned;
}
--
2.34.1
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