From: Jaewon Kim Date: Fri, 11 Oct 2024 12:49:28 +0000 (+0900) Subject: vmscan: add a vmscan event for reclaim_pages X-Git-Tag: v6.13-rc1~99^2~139 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1f2d03cc535138b7cdbed0122cdc0f9e9626c6bf;p=thirdparty%2Fkernel%2Flinux.git vmscan: add a vmscan event for reclaim_pages reclaim_folio_list uses a dummy reclaim_stat and is not being used. To know the memory stat, add a new trace event. This is useful how how many pages are not reclaimed or why. This is an example: mm_vmscan_reclaim_pages: nid=0 nr_scanned=112 nr_reclaimed=112 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 Currently reclaim_folio_list is only called by reclaim_pages, and reclaim_pages is used by damon and madvise. In the latest Android, reclaim_pages is also used by shmem to reclaim all pages in a address_space. [jaewon31.kim@samsung.com: use sc.nr_scanned rather than new counting] Link: https://lkml.kernel.org/r/20241016143227.961162-1-jaewon31.kim@samsung.com Link: https://lkml.kernel.org/r/20241011124928.1224813-1-jaewon31.kim@samsung.com Signed-off-by: Jaewon Kim Acked-by: Vlastimil Babka Cc: Jaewon Kim Cc: Kalesh Singh Cc: Minchan Kim Cc: SeongJae Park Signed-off-by: Andrew Morton --- diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h index 1a488c30afa53..490958fa10dee 100644 --- a/include/trace/events/vmscan.h +++ b/include/trace/events/vmscan.h @@ -346,6 +346,51 @@ TRACE_EVENT(mm_vmscan_write_folio, show_reclaim_flags(__entry->reclaim_flags)) ); +TRACE_EVENT(mm_vmscan_reclaim_pages, + + TP_PROTO(int nid, + unsigned long nr_scanned, unsigned long nr_reclaimed, + struct reclaim_stat *stat), + + TP_ARGS(nid, nr_scanned, nr_reclaimed, stat), + + TP_STRUCT__entry( + __field(int, nid) + __field(unsigned long, nr_scanned) + __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) + ), + + TP_fast_assign( + __entry->nid = nid; + __entry->nr_scanned = nr_scanned; + __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; + ), + + 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", + __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) +); + TRACE_EVENT(mm_vmscan_lru_shrink_inactive, TP_PROTO(int nid, diff --git a/mm/vmscan.c b/mm/vmscan.c index 6a3c498383fa1..5bec29914f122 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2129,7 +2129,7 @@ static void shrink_active_list(unsigned long nr_to_scan, static unsigned int reclaim_folio_list(struct list_head *folio_list, struct pglist_data *pgdat) { - struct reclaim_stat dummy_stat; + struct reclaim_stat stat; unsigned int nr_reclaimed; struct folio *folio; struct scan_control sc = { @@ -2140,12 +2140,13 @@ static unsigned int reclaim_folio_list(struct list_head *folio_list, .no_demotion = 1, }; - nr_reclaimed = shrink_folio_list(folio_list, pgdat, &sc, &dummy_stat, true); + nr_reclaimed = shrink_folio_list(folio_list, pgdat, &sc, &stat, true); while (!list_empty(folio_list)) { folio = lru_to_folio(folio_list); list_del(&folio->lru); folio_putback_lru(folio); } + trace_mm_vmscan_reclaim_pages(pgdat->node_id, sc.nr_scanned, nr_reclaimed, &stat); return nr_reclaimed; }