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charset="utf-8" X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20230924142129epcas1p4ae9161f7c20ea16408ccc8296f81104a References: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 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: isolate_mode=3D0 classzone=3D1 order=3D9 nr_reque= sted=3D4096 nr_scanned=3D431 nr_skipped=3D0 nr_taken=3D55 lru=3Danon mm_vmscan_lru_gen_evict: nid=3D0 nr_reclaimed=3D42 nr_dirty=3D0 nr_writeb= ack=3D0 nr_congested=3D0 nr_immediate=3D0 nr_activate_anon=3D13 nr_activate= _file=3D0 nr_ref_keep=3D0 nr_unmap_fail=3D0 priority=3D2 flags=3DRECLAIM_WB= _ANON|RECLAIM_WB_ASYNC mm_vmscan_lru_gen_scan: isolate_mode=3D0 classzone=3D1 order=3D9 nr_reque= sted=3D4096 nr_scanned=3D66 nr_skipped=3D0 nr_taken=3D64 lru=3Dfile mm_vmscan_lru_gen_evict: nid=3D0 nr_reclaimed=3D62 nr_dirty=3D0 nr_writeb= ack=3D0 nr_congested=3D0 nr_immediate=3D0 nr_activate_anon=3D0 nr_activate_= file=3D2 nr_ref_keep=3D0 nr_unmap_fail=3D0 priority=3D2 flags=3DRECLAIM_WB_= FILE|RECLAIM_WB_ASYNC Signed-off-by: Jaewon Kim Reviewed-by: Steven Rostedt (Google) Reviewed-by: T.J. Mercier --- v3: change printk format v2: use condition and make it aligned v1: introduce trace events --- include/trace/events/mmflags.h | 5 ++ include/trace/events/vmscan.h | 98 ++++++++++++++++++++++++++++++++++ mm/vmscan.c | 17 ++++-- 3 files changed, 115 insertions(+), 5 deletions(-) diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h index 1478b9dd05fa..44e9b38f83e7 100644 --- a/include/trace/events/mmflags.h +++ b/include/trace/events/mmflags.h @@ -274,6 +274,10 @@ IF_HAVE_VM_SOFTDIRTY(VM_SOFTDIRTY, "softdirty" ) \ EM (LRU_ACTIVE_FILE, "active_file") \ EMe(LRU_UNEVICTABLE, "unevictable") =20 +#define LRU_GEN_NAMES \ + EM (LRU_GEN_ANON, "anon") \ + EMe(LRU_GEN_FILE, "file") + /* * First define the enums in the above macros to be exported to userspace * via TRACE_DEFINE_ENUM(). @@ -288,6 +292,7 @@ COMPACTION_PRIORITY /* COMPACTION_FEEDBACK are defines not enums. Not needed here. */ ZONE_TYPE LRU_NAMES +LRU_GEN_NAMES =20 /* * 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..12eee5558016 100644 --- a/include/trace/events/vmscan.h +++ b/include/trace/events/vmscan.h @@ -327,6 +327,57 @@ TRACE_EVENT(mm_vmscan_lru_isolate, __print_symbolic(__entry->lru, LRU_NAMES)) ); =20 +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, + isolate_mode_t isolate_mode, + int lru), + + TP_ARGS(highest_zoneidx, order, nr_requested, nr_scanned, nr_skipped, nr_= taken, isolate_mode, 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(unsigned int, isolate_mode) + __field(int, lru) + ), + + TP_fast_assign( + __entry->highest_zoneidx =3D highest_zoneidx; + __entry->order =3D order; + __entry->nr_requested =3D nr_requested; + __entry->nr_scanned =3D nr_scanned; + __entry->nr_skipped =3D nr_skipped; + __entry->nr_taken =3D nr_taken; + __entry->isolate_mode =3D (__force unsigned int)isolate_mode; + __entry->lru =3D lru; + ), + + /* + * classzone is previous name of the highest_zoneidx. + * Reason not to change it is the ABI requirement of the tracepoint. + */ + TP_printk("isolate_mode=3D%u classzone=3D%d order=3D%d nr_requested=3D%lu= nr_scanned=3D%lu nr_skipped=3D%lu nr_taken=3D%lu lru=3D%s", + __entry->isolate_mode, + __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_write_folio, =20 TP_PROTO(struct folio *folio), @@ -437,6 +488,53 @@ TRACE_EVENT(mm_vmscan_lru_shrink_active, show_reclaim_flags(__entry->reclaim_flags)) ); =20 +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 =3D nid; + __entry->nr_reclaimed =3D nr_reclaimed; + __entry->nr_dirty =3D stat->nr_dirty; + __entry->nr_writeback =3D stat->nr_writeback; + __entry->nr_congested =3D stat->nr_congested; + __entry->nr_immediate =3D stat->nr_immediate; + __entry->nr_activate0 =3D stat->nr_activate[0]; + __entry->nr_activate1 =3D stat->nr_activate[1]; + __entry->nr_ref_keep =3D stat->nr_ref_keep; + __entry->nr_unmap_fail =3D stat->nr_unmap_fail; + __entry->priority =3D priority; + __entry->reclaim_flags =3D trace_reclaim_flags(file); + ), + + TP_printk("nid=3D%d nr_reclaimed=3D%lu nr_dirty=3D%lu nr_writeback=3D%lu = nr_congested=3D%lu nr_immediate=3D%lu nr_activate_anon=3D%u nr_activate_fil= e=3D%u nr_ref_keep=3D%lu nr_unmap_fail=3D%lu priority=3D%d flags=3D%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)) +); + TRACE_EVENT(mm_vmscan_node_reclaim_begin, =20 TP_PROTO(int nid, int order, gfp_t gfp_flags), diff --git a/mm/vmscan.c b/mm/vmscan.c index 6f13394b112e..f453a0f8ceef 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 =3D 0; int scanned =3D 0; int isolated =3D 0; + int skipped =3D 0; int remaining =3D MAX_LRU_BATCH; struct lru_gen_folio *lrugen =3D &lruvec->lrugen; struct mem_cgroup *memcg =3D lruvec_memcg(lruvec); @@ -5018,7 +5019,7 @@ static int scan_folios(struct lruvec *lruvec, struct = scan_control *sc, =20 for (i =3D MAX_NR_ZONES; i > 0; i--) { LIST_HEAD(moved); - int skipped =3D 0; + int skipped_zone =3D 0; int zone =3D (sc->reclaim_idx + i) % MAX_NR_ZONES; struct list_head *head =3D &lrugen->folios[gen][type][zone]; =20 @@ -5040,16 +5041,17 @@ static int scan_folios(struct lruvec *lruvec, struc= t scan_control *sc, isolated +=3D delta; } else { list_move(&folio->lru, &moved); - skipped +=3D delta; + skipped_zone +=3D delta; } =20 - if (!--remaining || max(isolated, skipped) >=3D MIN_LRU_BATCH) + if (!--remaining || max(isolated, skipped_zone) >=3D MIN_LRU_BATCH) break; } =20 - 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 +=3D skipped_zone; } =20 if (!remaining || isolated >=3D MIN_LRU_BATCH) @@ -5065,6 +5067,9 @@ static int scan_folios(struct lruvec *lruvec, struct = scan_control *sc, __count_memcg_events(memcg, PGREFILL, sorted); __count_vm_events(PGSCAN_ANON + type, isolated); =20 + trace_mm_vmscan_lru_gen_scan(sc->reclaim_idx, sc->order, MAX_LRU_BATCH, + scanned, skipped, isolated, + sc->may_unmap ? 0 : ISOLATE_UNMAPPED, type); /* * There might not be eligible folios due to reclaim_idx. Check the * remaining to prevent livelock if it's not making progress. @@ -5194,6 +5199,8 @@ static int evict_folios(struct lruvec *lruvec, struct= scan_control *sc, int swap retry: reclaimed =3D shrink_folio_list(&list, pgdat, sc, &stat, false); sc->nr_reclaimed +=3D reclaimed; + trace_mm_vmscan_lru_gen_evict(pgdat->node_id, reclaimed, &stat, + sc->priority, type); =20 list_for_each_entry_safe_reverse(folio, next, &list, lru) { if (!folio_evictable(folio)) { --=20 2.17.1