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The key steps > of memory reclamation include > 1.shrink_lruvec > * shrink_active_list, moves folios from the active LRU to the inactive LRU > * shrink_inactive_list, shrink lru from inactive LRU list > 2.shrink_slab > * shrinker->count_objects(), calculates the freeable memory > * shrinker->scan_objects(), reclaims the slab memory > > The existing tracers in the vmscan are as follows: > > --do_try_to_free_pages > --shrink_zones > --trace_mm_vmscan_node_reclaim_begin (tracer) > --shrink_node > --shrink_node_memcgs > --trace_mm_vmscan_memcg_shrink_begin (tracer) > --shrink_lruvec > --shrink_list > --shrink_active_list > --trace_mm_vmscan_lru_shrink_active (tracer) > --shrink_inactive_list > --trace_mm_vmscan_lru_shrink_inactive (tracer) > --shrink_active_list > --shrink_slab > --do_shrink_slab > --shrinker->count_objects() > --trace_mm_shrink_slab_start (tracer) > --shrinker->scan_objects() > --trace_mm_shrink_slab_end (tracer) > --trace_mm_vmscan_memcg_shrink_end (tracer) > --trace_mm_vmscan_node_reclaim_end (tracer) > > If we get the duration and quantity of shrink lru and slab, > then we can measure the memory recycling, as follows > > Measuring memory reclamation with bpf: > LRU FILE: > CPU COMM ShrinkActive(us) ShrinkInactive(us) Reclaim(page) > 7 kswapd0 26 51 32 > 7 kswapd0 52 47 13 > SLAB: > CPU COMM OBJ_NAME Count_Dur(us) Freeable(page) Scan_Dur(us) Reclaim(page) > 1 kswapd0 super_cache_scan.cfi_jt 2 341 3225 128 > 7 kswapd0 super_cache_scan.cfi_jt 0 2247 8524 1024 > 7 kswapd0 super_cache_scan.cfi_jt 2367 0 0 0 > > For this, add the new tracer to shrink_active_list/shrink_inactive_list > and shrinker->count_objects(). > > Changes: > v6: * Add Reviewed-by from Steven Rostedt. > v5: * Use 'DECLARE_EVENT_CLASS(mm_vmscan_lru_shrink_start_template' to > replace 'RACE_EVENT(mm_vmscan_lru_shrink_inactive/active_start' > * Add the explanation for adding new shrink lru events into 'mm: vmscan: add new event to trace shrink lru' > v4: Add Reviewed-by and Changlog to every patch. > v3: Swap the positions of 'nid' and 'freeable' to prevent the hole in the trace event. > v2: Modify trace_mm_vmscan_lru_shrink_inactive() in evict_folios() at the same time to fix build error. > > cuibixuan (2): > mm: shrinker: add new event to trace shrink count > mm: vmscan: add new event to trace shrink lru > > include/trace/events/vmscan.h | 80 ++++++++++++++++++++++++++++++++++- > mm/shrinker.c | 4 ++ > mm/vmscan.c | 11 +++-- > 3 files changed, 90 insertions(+), 5 deletions(-) >