diff options
| -rw-r--r-- | Documentation/vm/transhuge.txt | 5 | ||||
| -rw-r--r-- | include/linux/vm_event_item.h | 1 | ||||
| -rw-r--r-- | mm/huge_memory.c | 1 | ||||
| -rw-r--r-- | mm/vmstat.c | 1 |
4 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/vm/transhuge.txt b/Documentation/vm/transhuge.txt index 21cf34f3ddb2..0dc8632aa01e 100644 --- a/Documentation/vm/transhuge.txt +++ b/Documentation/vm/transhuge.txt @@ -229,6 +229,11 @@ thp_split_page is incremented every time a huge page is split into base thp_split_page_failed is is incremented if kernel fails to split huge page. This can happen if the page was pinned by somebody. +thp_deferred_split_page is incremented when a huge page is put onto split + queue. This happens when a huge page is partially unmapped and + splitting it would free up some memory. Pages on split queue are + going to be split under memory pressure. + thp_split_pmd is incremented every time a PMD split into table of PTEs. This can happen, for instance, when application calls mprotect() or munmap() on part of huge page. It doesn't split huge page, only diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h index 58ecc056ee45..ec084321fe09 100644 --- a/include/linux/vm_event_item.h +++ b/include/linux/vm_event_item.h @@ -72,6 +72,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, THP_COLLAPSE_ALLOC_FAILED, THP_SPLIT_PAGE, THP_SPLIT_PAGE_FAILED, + THP_DEFERRED_SPLIT_PAGE, THP_SPLIT_PMD, THP_ZERO_PAGE_ALLOC, THP_ZERO_PAGE_ALLOC_FAILED, diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 1ea21e203a70..1dddfb21fc22 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -3455,6 +3455,7 @@ void deferred_split_huge_page(struct page *page) spin_lock_irqsave(&pgdata->split_queue_lock, flags); if (list_empty(page_deferred_list(page))) { + count_vm_event(THP_DEFERRED_SPLIT_PAGE); list_add_tail(page_deferred_list(page), &pgdata->split_queue); pgdata->split_queue_len++; } diff --git a/mm/vmstat.c b/mm/vmstat.c index f80066248c94..5e4300482897 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -848,6 +848,7 @@ const char * const vmstat_text[] = { "thp_collapse_alloc_failed", "thp_split_page", "thp_split_page_failed", + "thp_deferred_split_page", "thp_split_pmd", "thp_zero_page_alloc", "thp_zero_page_alloc_failed", |