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charset="utf-8" When approaching the end of an rmap_walk traversal, we may need to perform some resource statistics or cleanup work, and these operations need to be done under lock. This patch adds a new exit hook to rmap_walk_control. Note that currently, the exit hook only be used in the anon and file rmap_walk implementations, as ksm no need it. Signed-off-by: Huan Yang --- include/linux/rmap.h | 2 ++ mm/rmap.c | 6 ++++++ 2 files changed, 8 insertions(+) diff --git a/include/linux/rmap.h b/include/linux/rmap.h index a305811d6310..594dc4df3bfb 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -999,6 +999,7 @@ void remove_migration_ptes(struct folio *src, struct fo= lio *dst, int flags); * locked: already locked before invoke rmap_walk * rmap_one: executed on each vma where page is mapped * done: for checking traversing termination condition + * exit: do some clean work below lock before leave rmap_walk * anon_lock: for getting anon_lock by optimized way rather than default * invalid_vma: for skipping uninterested vma */ @@ -1014,6 +1015,7 @@ struct rmap_walk_control { bool (*rmap_one)(struct folio *folio, struct vm_area_struct *vma, unsigned long addr, void *arg); int (*done)(struct folio *folio, struct rmap_walk_control *rwc); + void (*exit)(struct folio *folio, struct rmap_walk_control *rwc); struct anon_vma *(*anon_lock)(const struct folio *folio, struct rmap_walk_control *rwc); bool (*invalid_vma)(struct vm_area_struct *vma, void *arg); diff --git a/mm/rmap.c b/mm/rmap.c index e590f4071eca..66b48ab192f5 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -2832,6 +2832,9 @@ static void rmap_walk_anon(struct folio *folio, struc= t rmap_walk_control *rwc) break; } =20 + if (rwc->exit) + rwc->exit(folio, rwc); + if (!locked) anon_vma_unlock_read(anon_vma); } @@ -2895,6 +2898,9 @@ static void __rmap_walk_file(struct folio *folio, str= uct address_space *mapping, goto done; } done: + if (rwc->exit) + rwc->exit(folio, rwc); + if (!locked) i_mmap_unlock_read(mapping); } --=20 2.34.1