Messages in this thread Patch in this message | | | Subject | [patch 2/2] stats for orphaned pages (-mm only) | From | Nick Piggin <> | Date | Mon, 20 Jun 2005 17:24:29 +1000 |
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And this.
-- SUSE Labs, Novell Inc.
Index: linux-2.6/mm/swap.c =================================================================== --- linux-2.6.orig/mm/swap.c 2005-06-20 17:20:28.216728238 +1000 +++ linux-2.6/mm/swap.c 2005-06-20 17:21:38.253021265 +1000 @@ -114,8 +114,16 @@ struct zone *zone = page_zone(page); spin_lock_irqsave(&zone->lru_lock, flags); - ClearPageReferenced(page); + if (PageLRU(page)) + SetPageOrphaned(page); + if (PageReferenced(page)) { + if (PageLRU(page)) + inc_page_state(pg_orph_stripped); + ClearPageReferenced(page); + } + if (PageLRU(page) && PageActive(page)) { + inc_page_state(pg_orph_rotated); list_move(&page->lru, &zone->inactive_list); ClearPageActive(page); } Index: linux-2.6/include/linux/page-flags.h =================================================================== --- linux-2.6.orig/include/linux/page-flags.h 2005-06-20 17:20:28.216728238 +1000 +++ linux-2.6/include/linux/page-flags.h 2005-06-20 17:20:56.005273542 +1000 @@ -77,6 +77,8 @@ #define PG_nosave_free 19 /* Free, should not be written */ #define PG_uncached 20 /* Page has been mapped as uncached */ +#define PG_orphaned 21 + /* * Global page accounting. One instance per CPU. Only unsigned longs are * allowed. @@ -132,6 +134,11 @@ unsigned long pgrotated; /* pages rotated to tail of the LRU */ unsigned long nr_bounce; /* pages for bounce buffers */ + + unsigned long pg_orph_stripped; /* Removed ref bit from orphaned page */ + unsigned long pg_orph_rotated; /* Deactivated orphaned page */ + unsigned long pg_orph_busy; /* Found orphans still busy */ + unsigned long pg_orph_reclaim; /* Reclaimed orphan at first sight */ }; extern void get_page_state(struct page_state *ret); @@ -306,6 +313,10 @@ #define SetPageUncached(page) set_bit(PG_uncached, &(page)->flags) #define ClearPageUncached(page) clear_bit(PG_uncached, &(page)->flags) +#define PageOrphaned(page) test_bit(PG_orphaned, &(page)->flags) +#define SetPageOrphaned(page) set_bit(PG_orphaned, &(page)->flags) +#define ClearPageOrphaned(page) clear_bit(PG_orphaned, &(page)->flags) + struct page; /* forward declaration */ int test_clear_page_dirty(struct page *page); Index: linux-2.6/mm/page_alloc.c =================================================================== --- linux-2.6.orig/mm/page_alloc.c 2005-06-20 17:20:28.216728238 +1000 +++ linux-2.6/mm/page_alloc.c 2005-06-20 17:20:56.006273417 +1000 @@ -1899,6 +1899,11 @@ "pgrotated", "nr_bounce", + + "pg_orph_stripped", + "pg_orph_rotated", + "pg_orph_busy", + "pg_orph_reclaim", }; static void *vmstat_start(struct seq_file *m, loff_t *pos) Index: linux-2.6/mm/vmscan.c =================================================================== --- linux-2.6.orig/mm/vmscan.c 2005-06-20 17:20:28.216728238 +1000 +++ linux-2.6/mm/vmscan.c 2005-06-20 17:21:26.171523247 +1000 @@ -522,6 +522,11 @@ __put_page(page); free_it: + if (PageOrphaned(page)) { + inc_page_state(pg_orph_reclaim); + ClearPageOrphaned(page); + } + unlock_page(page); reclaimed++; if (!pagevec_add(&freed_pvec, page)) @@ -534,6 +539,11 @@ keep_locked: unlock_page(page); keep: + if (PageOrphaned(page)) { + inc_page_state(pg_orph_busy); + ClearPageOrphaned(page); + } + list_add(&page->lru, &ret_pages); BUG_ON(PageLRU(page)); } | |