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Date: Tue, 26 Sep 2023 13:22:50 +0900
From: Jaewon Kim <jaewon31.kim@...sung.com>
To: rostedt@...dmis.org, tjmercier@...gle.com, yuzhao@...gle.com,
kaleshsingh@...gle.com, akpm@...ux-foundation.org, vbabka@...e.cz,
hannes@...xchg.org, sj@...nel.org
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
linux-mm@...ck.org, jaewon31.kim@...il.com,
Jaewon Kim <jaewon31.kim@...sung.com>
Subject: [PATCH v4] vmscan: add trace events for lru_gen
As the legacy lru provides, the lru_gen needs some trace events for
debugging.
This commit introduces 2 trace events.
trace_mm_vmscan_lru_gen_scan
trace_mm_vmscan_lru_gen_evict
Each event is similar to the following legacy events.
trace_mm_vmscan_lru_isolate,
trace_mm_vmscan_lru_shrink_[in]active
Here's an example
mm_vmscan_lru_gen_scan: classzone=2 order=0 nr_requested=4096 nr_scanned=64 nr_skipped=0 nr_taken=64 lru=anon
mm_vmscan_lru_gen_evict: nid=0 nr_reclaimed=64 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=2 flags=RECLAIM_WB_ANON|RECLAIM_WB_ASYNC
mm_vmscan_lru_gen_scan: classzone=1 order=0 nr_requested=4096 nr_scanned=64 nr_skipped=0 nr_taken=64 lru=file
mm_vmscan_lru_gen_evict: nid=0 nr_reclaimed=64 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=12 flags=RECLAIM_WB_FILE|RECLAIM_WB_ASYNC
Signed-off-by: Jaewon Kim <jaewon31.kim@...sung.com>
---
v4: wrap with #ifdef CONFIG_LRU_GEN
v3: change printk format
v2: use condition and make it aligned
v1: introduce trace events
---
include/trace/events/mmflags.h | 9 ++++
include/trace/events/vmscan.h | 96 ++++++++++++++++++++++++++++++++++
mm/vmscan.c | 20 +++++--
3 files changed, 120 insertions(+), 5 deletions(-)
diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index 1478b9dd05fa..6dfe85bd4e81 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h
@@ -274,6 +274,12 @@ IF_HAVE_VM_SOFTDIRTY(VM_SOFTDIRTY, "softdirty" ) \
EM (LRU_ACTIVE_FILE, "active_file") \
EMe(LRU_UNEVICTABLE, "unevictable")
+#ifdef CONFIG_LRU_GEN
+#define LRU_GEN_NAMES \
+ EM (LRU_GEN_ANON, "anon") \
+ EMe(LRU_GEN_FILE, "file")
+#endif
+
/*
* First define the enums in the above macros to be exported to userspace
* via TRACE_DEFINE_ENUM().
@@ -288,6 +294,9 @@ COMPACTION_PRIORITY
/* COMPACTION_FEEDBACK are defines not enums. Not needed here. */
ZONE_TYPE
LRU_NAMES
+#ifdef CONFIG_LRU_GEN
+LRU_GEN_NAMES
+#endif
/*
* Now redefine the EM() and EMe() macros to map the enums to the strings
diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index d2123dd960d5..2080ef742f89 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -327,6 +327,102 @@ TRACE_EVENT(mm_vmscan_lru_isolate,
__print_symbolic(__entry->lru, LRU_NAMES))
);
+#ifdef CONFIG_LRU_GEN
+TRACE_EVENT_CONDITION(mm_vmscan_lru_gen_scan,
+ TP_PROTO(int highest_zoneidx,
+ int order,
+ unsigned long nr_requested,
+ unsigned long nr_scanned,
+ unsigned long nr_skipped,
+ unsigned long nr_taken,
+ int lru),
+
+ TP_ARGS(highest_zoneidx, order, nr_requested, nr_scanned, nr_skipped, nr_taken, lru),
+
+ TP_CONDITION(nr_scanned),
+
+ TP_STRUCT__entry(
+ __field(int, highest_zoneidx)
+ __field(int, order)
+ __field(unsigned long, nr_requested)
+ __field(unsigned long, nr_scanned)
+ __field(unsigned long, nr_skipped)
+ __field(unsigned long, nr_taken)
+ __field(int, lru)
+ ),
+
+ TP_fast_assign(
+ __entry->highest_zoneidx = highest_zoneidx;
+ __entry->order = order;
+ __entry->nr_requested = nr_requested;
+ __entry->nr_scanned = nr_scanned;
+ __entry->nr_skipped = nr_skipped;
+ __entry->nr_taken = nr_taken;
+ __entry->lru = lru;
+ ),
+
+ /*
+ * classzone is previous name of the highest_zoneidx.
+ * Reason not to change it is the ABI requirement of the tracepoint.
+ */
+ TP_printk("classzone=%d order=%d nr_requested=%lu nr_scanned=%lu nr_skipped=%lu nr_taken=%lu lru=%s",
+ __entry->highest_zoneidx,
+ __entry->order,
+ __entry->nr_requested,
+ __entry->nr_scanned,
+ __entry->nr_skipped,
+ __entry->nr_taken,
+ __print_symbolic(__entry->lru, LRU_GEN_NAMES))
+);
+
+TRACE_EVENT(mm_vmscan_lru_gen_evict,
+
+ TP_PROTO(int nid, unsigned long nr_reclaimed,
+ struct reclaim_stat *stat, int priority, int file),
+
+ TP_ARGS(nid, nr_reclaimed, stat, priority, file),
+
+ TP_STRUCT__entry(
+ __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)
+ __field(int, nid)
+ __field(int, priority)
+ __field(int, reclaim_flags)
+ ),
+
+ TP_fast_assign(
+ __entry->nid = nid;
+ __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;
+ __entry->priority = priority;
+ __entry->reclaim_flags = trace_reclaim_flags(file);
+ ),
+
+ TP_printk("nid=%d nr_reclaimed=%lu nr_dirty=%lu nr_writeback=%lu nr_congested=%lu nr_immediate=%lu nr_activate_anon=%u nr_activate_file=%u nr_ref_keep=%lu nr_unmap_fail=%lu priority=%d flags=%s",
+ __entry->nid, __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,
+ show_reclaim_flags(__entry->reclaim_flags))
+);
+#endif
+
TRACE_EVENT(mm_vmscan_write_folio,
TP_PROTO(struct folio *folio),
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6f13394b112e..0c8b48bcb461 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -5005,6 +5005,7 @@ static int scan_folios(struct lruvec *lruvec, struct scan_control *sc,
int sorted = 0;
int scanned = 0;
int isolated = 0;
+ int skipped = 0;
int remaining = MAX_LRU_BATCH;
struct lru_gen_folio *lrugen = &lruvec->lrugen;
struct mem_cgroup *memcg = lruvec_memcg(lruvec);
@@ -5018,7 +5019,7 @@ static int scan_folios(struct lruvec *lruvec, struct scan_control *sc,
for (i = MAX_NR_ZONES; i > 0; i--) {
LIST_HEAD(moved);
- int skipped = 0;
+ int skipped_zone = 0;
int zone = (sc->reclaim_idx + i) % MAX_NR_ZONES;
struct list_head *head = &lrugen->folios[gen][type][zone];
@@ -5040,16 +5041,17 @@ static int scan_folios(struct lruvec *lruvec, struct scan_control *sc,
isolated += delta;
} else {
list_move(&folio->lru, &moved);
- skipped += delta;
+ skipped_zone += delta;
}
- if (!--remaining || max(isolated, skipped) >= MIN_LRU_BATCH)
+ if (!--remaining || max(isolated, skipped_zone) >= MIN_LRU_BATCH)
break;
}
- if (skipped) {
+ if (skipped_zone) {
list_splice(&moved, head);
- __count_zid_vm_events(PGSCAN_SKIP, zone, skipped);
+ __count_zid_vm_events(PGSCAN_SKIP, zone, skipped_zone);
+ skipped += skipped_zone;
}
if (!remaining || isolated >= MIN_LRU_BATCH)
@@ -5065,6 +5067,10 @@ static int scan_folios(struct lruvec *lruvec, struct scan_control *sc,
__count_memcg_events(memcg, PGREFILL, sorted);
__count_vm_events(PGSCAN_ANON + type, isolated);
+#ifdef CONFIG_LRU_GEN
+ trace_mm_vmscan_lru_gen_scan(sc->reclaim_idx, sc->order, MAX_LRU_BATCH,
+ scanned, skipped, isolated, type);
+#endif
/*
* There might not be eligible folios due to reclaim_idx. Check the
* remaining to prevent livelock if it's not making progress.
@@ -5194,6 +5200,10 @@ static int evict_folios(struct lruvec *lruvec, struct scan_control *sc, int swap
retry:
reclaimed = shrink_folio_list(&list, pgdat, sc, &stat, false);
sc->nr_reclaimed += reclaimed;
+#ifdef CONFIG_LRU_GEN
+ trace_mm_vmscan_lru_gen_evict(pgdat->node_id, reclaimed, &stat,
+ sc->priority, type);
+#endif
list_for_each_entry_safe_reverse(folio, next, &list, lru) {
if (!folio_evictable(folio)) {
--
2.17.1
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