Memory offline and memory failure handling dissolve free hugetlb folios
and lower nr_hugepages. Nothing records this, so when the pool shrinks
it is hard to tell whether that or a write to nr_hugepages caused it.
Add an htlb_dissolve event, counted for each folio that
dissolve_free_hugetlb_folio() frees.
Signed-off-by: Mark Bundschuh <mkbund@amazon.com>
---
include/linux/vm_event_item.h | 1 +
mm/hugetlb.c | 1 +
mm/vmstat.c | 1 +
3 files changed, 3 insertions(+)
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 2628ccda076a..822fe862e5b3 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -71,6 +71,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
#endif
#ifdef CONFIG_HUGETLB_PAGE
HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
+ HTLB_DISSOLVE,
#endif
#ifdef CONFIG_CMA
CMA_ALLOC_SUCCESS,
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index da5d04edf7c1..7c79523b2a3c 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2047,6 +2047,7 @@ int dissolve_free_hugetlb_folio(struct folio *folio)
}
update_and_free_hugetlb_folio(h, folio, false);
+ count_vm_event(HTLB_DISSOLVE);
return rc;
}
out:
diff --git a/mm/vmstat.c b/mm/vmstat.c
index a3e809c57f29..6282eef7074a 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1397,6 +1397,7 @@ const char * const vmstat_text[] = {
#ifdef CONFIG_HUGETLB_PAGE
[I(HTLB_BUDDY_PGALLOC)] = "htlb_buddy_alloc_success",
[I(HTLB_BUDDY_PGALLOC_FAIL)] = "htlb_buddy_alloc_fail",
+ [I(HTLB_DISSOLVE)] = "htlb_dissolve",
#endif
#ifdef CONFIG_CMA
[I(CMA_ALLOC_SUCCESS)] = "cma_alloc_success",
base-commit: 05441d697f7f9a927264f4058cbbc6a03dfcac9d
--
2.50.1