| Message ID | 20230921062206.14429-1-jaewon31.kim@samsung.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2] vmscan: add trace events for lru_gen | expand |
>On Thu, 21 Sep 2023 09:12:30 -0700 >"T.J. Mercier" <tjmercier@google.com> wrote: > >> > + 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=%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", >> >> Many of these values are unsigned so I think many of these format >> specifiers should be %lu instead of %ld. Hello T.J. Thank you for your comment As you expected I got this from the legacy lru trace. I've changed as you recommended. Actually I changed isolate_mode, too. Please let me know if this is not actually needed. --- a/include/trace/events/vmscan.h +++ b/include/trace/events/vmscan.h @@ -367,7 +367,7 @@ TRACE_EVENT_CONDITION(mm_vmscan_lru_gen_scan, * classzone is previous name of the highest_zoneidx. * Reason not to change it is the ABI requirement of the tracepoint. */ - TP_printk("isolate_mode=%d classzone=%d order=%d nr_requested=%lu nr_scanned=%lu nr_skipped=%lu nr_taken=%lu lru=%s", + TP_printk("isolate_mode=%u classzone=%d order=%d nr_requested=%lu nr_scanned=%lu nr_skipped=%lu nr_taken=%lu lru=%s", __entry->isolate_mode, __entry->highest_zoneidx, __entry->order, @@ -525,7 +525,7 @@ TRACE_EVENT(mm_vmscan_lru_gen_evict, __entry->reclaim_flags = trace_reclaim_flags(file); ), - TP_printk("nid=%d 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_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, > >Other than this, from the tracing POV: > >Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Hello Steven I've appreciated your Reviewed-by, let me take this on my next v3 patch. > >-- Steve
On Thu, Sep 21, 2023 at 7:27 PM 김재원 <jaewon31.kim@samsung.com> wrote: > > >On Thu, 21 Sep 2023 09:12:30 -0700 > >"T.J. Mercier" <tjmercier@google.com> wrote: > > > >> > + 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=%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", > >> > >> Many of these values are unsigned so I think many of these format > >> specifiers should be %lu instead of %ld. > > Hello T.J. > Thank you for your comment > As you expected I got this from the legacy lru trace. > I've changed as you recommended. > Actually I changed isolate_mode, too. Please let me know if this is not actually needed. > Great, looks good to me. Reviewed-by: T.J. Mercier <tjmercier@google.com> > --- a/include/trace/events/vmscan.h > +++ b/include/trace/events/vmscan.h > @@ -367,7 +367,7 @@ TRACE_EVENT_CONDITION(mm_vmscan_lru_gen_scan, > * classzone is previous name of the highest_zoneidx. > * Reason not to change it is the ABI requirement of the tracepoint. > */ > - TP_printk("isolate_mode=%d classzone=%d order=%d nr_requested=%lu nr_scanned=%lu nr_skipped=%lu nr_taken=%lu lru=%s", > + TP_printk("isolate_mode=%u classzone=%d order=%d nr_requested=%lu nr_scanned=%lu nr_skipped=%lu nr_taken=%lu lru=%s", > __entry->isolate_mode, > __entry->highest_zoneidx, > __entry->order, > @@ -525,7 +525,7 @@ TRACE_EVENT(mm_vmscan_lru_gen_evict, > __entry->reclaim_flags = trace_reclaim_flags(file); > ), > > - TP_printk("nid=%d 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_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, > > > > >Other than this, from the tracing POV: > > > >Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> > > > Hello Steven > I've appreciated your Reviewed-by, let me take this on my next v3 patch. > > > > >-- Steve
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") +#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 /* * 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..f0c3a4bd72db 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)) ); +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 = 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->isolate_mode = (__force unsigned int)isolate_mode; + __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("isolate_mode=%d classzone=%d order=%d nr_requested=%lu nr_scanned=%lu nr_skipped=%lu nr_taken=%lu lru=%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, TP_PROTO(struct folio *folio), @@ -437,6 +488,53 @@ TRACE_EVENT(mm_vmscan_lru_shrink_active, show_reclaim_flags(__entry->reclaim_flags)) ); +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=%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", + __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, 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 = 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 +5067,9 @@ static int scan_folios(struct lruvec *lruvec, struct scan_control *sc, __count_memcg_events(memcg, PGREFILL, sorted); __count_vm_events(PGSCAN_ANON + type, isolated); + 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 = shrink_folio_list(&list, pgdat, sc, &stat, false); sc->nr_reclaimed += reclaimed; + trace_mm_vmscan_lru_gen_evict(pgdat->node_id, reclaimed, &stat, + sc->priority, type); list_for_each_entry_safe_reverse(folio, next, &list, lru) { if (!folio_evictable(folio)) {
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=0 classzone=1 order=9 nr_requested=4096 nr_scanned=431 nr_skipped=0 nr_taken=55 lru=anon mm_vmscan_lru_gen_evict: nid=0 nr_reclaimed=42 nr_dirty=0 nr_writeback=0 nr_congested=0 nr_immediate=0 nr_activate_anon=13 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: isolate_mode=0 classzone=1 order=9 nr_requested=4096 nr_scanned=66 nr_skipped=0 nr_taken=64 lru=file mm_vmscan_lru_gen_evict: nid=0 nr_reclaimed=62 nr_dirty=0 nr_writeback=0 nr_congested=0 nr_immediate=0 nr_activate_anon=0 nr_activate_file=2 nr_ref_keep=0 nr_unmap_fail=0 priority=2 flags=RECLAIM_WB_FILE|RECLAIM_WB_ASYNC Signed-off-by: Jaewon Kim <jaewon31.kim@samsung.com> --- 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(-)