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mm: remove CONFIG_UNEVICTABLE_LRU config option

Browse source 
Currently, nobody wants to turn UNEVICTABLE_LRU off.  Thus this
configurability is unnecessary.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andi Kleen <andi@firstfloor.org>
Acked-by: Minchan Kim <minchan.kim@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KOSAKI Motohiro 2009-06-16 15:32:51 -07:00 committed by Linus Torvalds
parent bce7394a3e
commit 6837765963
17 changed files with 3 additions and 153 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
drivers/base/node.c
View file

@ -72,10 +72,8 @@ static ssize_t node_read_meminfo(struct sys_device * dev,
"Node %d Inactive(anon): %8lu kB\n"
"Node %d Active(file): %8lu kB\n"
"Node %d Inactive(file): %8lu kB\n"
#ifdef CONFIG_UNEVICTABLE_LRU
"Node %d Unevictable: %8lu kB\n"
"Node %d Mlocked: %8lu kB\n"
#endif
#ifdef CONFIG_HIGHMEM
"Node %d HighTotal: %8lu kB\n"
"Node %d HighFree: %8lu kB\n"
@ -105,10 +103,8 @@ static ssize_t node_read_meminfo(struct sys_device * dev,
nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
#ifdef CONFIG_UNEVICTABLE_LRU
nid, K(node_page_state(nid, NR_UNEVICTABLE)),
nid, K(node_page_state(nid, NR_MLOCK)),
#endif
#ifdef CONFIG_HIGHMEM
nid, K(i.totalhigh),
nid, K(i.freehigh),

4
fs/proc/meminfo.c
View file

@ -64,10 +64,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
"Inactive(anon): %8lu kB\n"
"Active(file): %8lu kB\n"
"Inactive(file): %8lu kB\n"
#ifdef CONFIG_UNEVICTABLE_LRU
"Unevictable: %8lu kB\n"
"Mlocked: %8lu kB\n"
#endif
#ifdef CONFIG_HIGHMEM
"HighTotal: %8lu kB\n"
"HighFree: %8lu kB\n"
@ -109,10 +107,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
K(pages[LRU_INACTIVE_ANON]),
K(pages[LRU_ACTIVE_FILE]),
K(pages[LRU_INACTIVE_FILE]),
#ifdef CONFIG_UNEVICTABLE_LRU
K(pages[LRU_UNEVICTABLE]),
K(global_page_state(NR_MLOCK)),
#endif
#ifdef CONFIG_HIGHMEM
K(i.totalhigh),
K(i.freehigh),

2
fs/proc/page.c
View file

@ -172,10 +172,8 @@ static u64 get_uflags(struct page *page)
u |= kpf_copy_bit(k, KPF_SWAPCACHE, PG_swapcache);
u |= kpf_copy_bit(k, KPF_SWAPBACKED, PG_swapbacked);
#ifdef CONFIG_UNEVICTABLE_LRU
u |= kpf_copy_bit(k, KPF_UNEVICTABLE, PG_unevictable);
u |= kpf_copy_bit(k, KPF_MLOCKED, PG_mlocked);
#endif
#ifdef CONFIG_IA64_UNCACHED_ALLOCATOR
u |= kpf_copy_bit(k, KPF_UNCACHED, PG_uncached);

13
include/linux/mmzone.h
View file

@ -83,13 +83,8 @@ enum zone_stat_item {
NR_ACTIVE_ANON, /* " " " " " */
NR_INACTIVE_FILE, /* " " " " " */
NR_ACTIVE_FILE, /* " " " " " */
#ifdef CONFIG_UNEVICTABLE_LRU
NR_UNEVICTABLE, /* " " " " " */
NR_MLOCK, /* mlock()ed pages found and moved off LRU */
#else
NR_UNEVICTABLE = NR_ACTIVE_FILE, /* avoid compiler errors in dead code */
NR_MLOCK = NR_ACTIVE_FILE,
#endif
NR_ANON_PAGES, /* Mapped anonymous pages */
NR_FILE_MAPPED, /* pagecache pages mapped into pagetables.
only modified from process context */
@ -132,11 +127,7 @@ enum lru_list {
LRU_ACTIVE_ANON = LRU_BASE + LRU_ACTIVE,
LRU_INACTIVE_FILE = LRU_BASE + LRU_FILE,
LRU_ACTIVE_FILE = LRU_BASE + LRU_FILE + LRU_ACTIVE,
#ifdef CONFIG_UNEVICTABLE_LRU
LRU_UNEVICTABLE,
#else
LRU_UNEVICTABLE = LRU_ACTIVE_FILE, /* avoid compiler errors in dead code */
#endif
NR_LRU_LISTS
};
@ -156,11 +147,7 @@ static inline int is_active_lru(enum lru_list l)
static inline int is_unevictable_lru(enum lru_list l)
{
#ifdef CONFIG_UNEVICTABLE_LRU
return (l == LRU_UNEVICTABLE);
#else
return 0;
#endif
}
enum zone_watermarks {

16
include/linux/page-flags.h
View file

@ -95,9 +95,7 @@ enum pageflags {
PG_reclaim, /* To be reclaimed asap */
PG_buddy, /* Page is free, on buddy lists */
PG_swapbacked, /* Page is backed by RAM/swap */
#ifdef CONFIG_UNEVICTABLE_LRU
PG_unevictable, /* Page is "unevictable" */
#endif
#ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT
PG_mlocked, /* Page is vma mlocked */
#endif
@ -248,14 +246,8 @@ PAGEFLAG_FALSE(SwapCache)
SETPAGEFLAG_NOOP(SwapCache) CLEARPAGEFLAG_NOOP(SwapCache)
#endif
#ifdef CONFIG_UNEVICTABLE_LRU
PAGEFLAG(Unevictable, unevictable) __CLEARPAGEFLAG(Unevictable, unevictable)
TESTCLEARFLAG(Unevictable, unevictable)
#else
PAGEFLAG_FALSE(Unevictable) TESTCLEARFLAG_FALSE(Unevictable)
SETPAGEFLAG_NOOP(Unevictable) CLEARPAGEFLAG_NOOP(Unevictable)
__CLEARPAGEFLAG_NOOP(Unevictable)
#endif
#ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT
#define MLOCK_PAGES 1
@ -382,12 +374,6 @@ static inline void __ClearPageTail(struct page *page)
#endif /* !PAGEFLAGS_EXTENDED */
#ifdef CONFIG_UNEVICTABLE_LRU
#define __PG_UNEVICTABLE (1 << PG_unevictable)
#else
#define __PG_UNEVICTABLE 0
#endif
#ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT
#define __PG_MLOCKED (1 << PG_mlocked)
#else
@ -403,7 +389,7 @@ static inline void __ClearPageTail(struct page *page)
1 << PG_private | 1 << PG_private_2 | \
1 << PG_buddy | 1 << PG_writeback | 1 << PG_reserved | \
1 << PG_slab | 1 << PG_swapcache | 1 << PG_active | \
__PG_UNEVICTABLE | __PG_MLOCKED)
1 << PG_unevictable | __PG_MLOCKED)
/*
* Flags checked when a page is prepped for return by the page allocator.

12
include/linux/pagemap.h
View file

@ -22,9 +22,7 @@ enum mapping_flags {
AS_EIO = __GFP_BITS_SHIFT + 0, /* IO error on async write */
AS_ENOSPC = __GFP_BITS_SHIFT + 1, /* ENOSPC on async write */
AS_MM_ALL_LOCKS = __GFP_BITS_SHIFT + 2, /* under mm_take_all_locks() */
#ifdef CONFIG_UNEVICTABLE_LRU
AS_UNEVICTABLE = __GFP_BITS_SHIFT + 3, /* e.g., ramdisk, SHM_LOCK */
#endif
};
static inline void mapping_set_error(struct address_space *mapping, int error)
@ -37,8 +35,6 @@ static inline void mapping_set_error(struct address_space *mapping, int error)
}
}
#ifdef CONFIG_UNEVICTABLE_LRU
static inline void mapping_set_unevictable(struct address_space *mapping)
{
set_bit(AS_UNEVICTABLE, &mapping->flags);
@ -55,14 +51,6 @@ static inline int mapping_unevictable(struct address_space *mapping)
return test_bit(AS_UNEVICTABLE, &mapping->flags);
return !!mapping;
}
#else
static inline void mapping_set_unevictable(struct address_space *mapping) { }
static inline void mapping_clear_unevictable(struct address_space *mapping) { }
static inline int mapping_unevictable(struct address_space *mapping)
{
return 0;
}
#endif
static inline gfp_t mapping_gfp_mask(struct address_space * mapping)
{

7
include/linux/rmap.h
View file

@ -105,18 +105,11 @@ unsigned long page_address_in_vma(struct page *, struct vm_area_struct *);
*/
int page_mkclean(struct page *);
#ifdef CONFIG_UNEVICTABLE_LRU
/*
* called in munlock()/munmap() path to check for other vmas holding
* the page mlocked.
*/
int try_to_munlock(struct page *);
#else
static inline int try_to_munlock(struct page *page)
{
return 0; /* a.k.a. SWAP_SUCCESS */
}
#endif
#else /* !CONFIG_MMU */

19
include/linux/swap.h
View file

@ -235,7 +235,6 @@ static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order)
}
#endif
#ifdef CONFIG_UNEVICTABLE_LRU
extern int page_evictable(struct page *page, struct vm_area_struct *vma);
extern void scan_mapping_unevictable_pages(struct address_space *);
@ -244,24 +243,6 @@ extern int scan_unevictable_handler(struct ctl_table *, int, struct file *,
void __user *, size_t *, loff_t *);
extern int scan_unevictable_register_node(struct node *node);
extern void scan_unevictable_unregister_node(struct node *node);
#else
static inline int page_evictable(struct page *page,
struct vm_area_struct *vma)
{
return 1;
}
static inline void scan_mapping_unevictable_pages(struct address_space *mapping)
{
}
static inline int scan_unevictable_register_node(struct node *node)
{
return 0;
}
static inline void scan_unevictable_unregister_node(struct node *node) { }
#endif
extern int kswapd_run(int nid);

2
include/linux/vmstat.h
View file

@ -41,7 +41,6 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
#ifdef CONFIG_HUGETLB_PAGE
HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
#endif
#ifdef CONFIG_UNEVICTABLE_LRU
UNEVICTABLE_PGCULLED, /* culled to noreclaim list */
UNEVICTABLE_PGSCANNED, /* scanned for reclaimability */
UNEVICTABLE_PGRESCUED, /* rescued from noreclaim list */
@ -50,7 +49,6 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
UNEVICTABLE_PGCLEARED, /* on COW, page truncate */
UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */
UNEVICTABLE_MLOCKFREED,
#endif
NR_VM_EVENT_ITEMS
};

2
kernel/sysctl.c
View file

@ -1325,7 +1325,6 @@ static struct ctl_table vm_table[] = {
.extra2 = &one,
},
#endif
#ifdef CONFIG_UNEVICTABLE_LRU
{
.ctl_name = CTL_UNNUMBERED,
.procname = "scan_unevictable_pages",
@ -1334,7 +1333,6 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = &scan_unevictable_handler,
},
#endif
/*
* NOTE: do not add new entries to this table unless you have read
* Documentation/sysctl/ctl_unnumbered.txt

14
mm/Kconfig
View file

@ -203,25 +203,13 @@ config VIRT_TO_BUS
def_bool y
depends on !ARCH_NO_VIRT_TO_BUS
config UNEVICTABLE_LRU
bool "Add LRU list to track non-evictable pages"
default y
help
Keeps unevictable pages off of the active and inactive pageout
lists, so kswapd will not waste CPU time or have its balancing
algorithms thrown off by scanning these pages. Selecting this
will use one page flag and increase the code size a little,
say Y unless you know what you are doing.
See Documentation/vm/unevictable-lru.txt for more information.
config HAVE_MLOCK
bool
default y if MMU=y
config HAVE_MLOCKED_PAGE_BIT
bool
default y if HAVE_MLOCK=y && UNEVICTABLE_LRU=y
default y if HAVE_MLOCK=y
config MMU_NOTIFIER
bool

6
mm/internal.h
View file

@ -73,7 +73,6 @@ static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
}
#endif
#ifdef CONFIG_UNEVICTABLE_LRU
/*
* unevictable_migrate_page() called only from migrate_page_copy() to
* migrate unevictable flag to new page.
@ -85,11 +84,6 @@ static inline void unevictable_migrate_page(struct page *new, struct page *old)
if (TestClearPageUnevictable(old))
SetPageUnevictable(new);
}
#else
static inline void unevictable_migrate_page(struct page *new, struct page *old)
{
}
#endif
#ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT
/*

22
mm/mlock.c
View file

@ -31,7 +31,6 @@ int can_do_mlock(void)
}
EXPORT_SYMBOL(can_do_mlock);
#ifdef CONFIG_UNEVICTABLE_LRU
/*
* Mlocked pages are marked with PageMlocked() flag for efficient testing
* in vmscan and, possibly, the fault path; and to support semi-accurate
@ -261,27 +260,6 @@ static int __mlock_posix_error_return(long retval)
return retval;
}
#else /* CONFIG_UNEVICTABLE_LRU */
/*
* Just make pages present if VM_LOCKED. No-op if unlocking.
*/
static long __mlock_vma_pages_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end,
int mlock)
{
if (mlock && (vma->vm_flags & VM_LOCKED))
return make_pages_present(start, end);
return 0;
}
static inline int __mlock_posix_error_return(long retval)
{
return 0;
}
#endif /* CONFIG_UNEVICTABLE_LRU */
/**
* mlock_vma_pages_range() - mlock pages in specified vma range.
* @vma - the vma containing the specfied address range

9
mm/page_alloc.c
View file

@ -2077,19 +2077,14 @@ void show_free_areas(void)
printk("Active_anon:%lu active_file:%lu inactive_anon:%lu\n"
" inactive_file:%lu"
//TODO: check/adjust line lengths
#ifdef CONFIG_UNEVICTABLE_LRU
" unevictable:%lu"
#endif
" dirty:%lu writeback:%lu unstable:%lu\n"
" free:%lu slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n",
global_page_state(NR_ACTIVE_ANON),
global_page_state(NR_ACTIVE_FILE),
global_page_state(NR_INACTIVE_ANON),
global_page_state(NR_INACTIVE_FILE),
#ifdef CONFIG_UNEVICTABLE_LRU
global_page_state(NR_UNEVICTABLE),
#endif
global_page_state(NR_FILE_DIRTY),
global_page_state(NR_WRITEBACK),
global_page_state(NR_UNSTABLE_NFS),
@ -2113,9 +2108,7 @@ void show_free_areas(void)
" inactive_anon:%lukB"
" active_file:%lukB"
" inactive_file:%lukB"
#ifdef CONFIG_UNEVICTABLE_LRU
" unevictable:%lukB"
#endif
" present:%lukB"
" pages_scanned:%lu"
" all_unreclaimable? %s"
@ -2129,9 +2122,7 @@ void show_free_areas(void)
K(zone_page_state(zone, NR_INACTIVE_ANON)),
K(zone_page_state(zone, NR_ACTIVE_FILE)),
K(zone_page_state(zone, NR_INACTIVE_FILE)),
#ifdef CONFIG_UNEVICTABLE_LRU
K(zone_page_state(zone, NR_UNEVICTABLE)),
#endif
K(zone->present_pages),
zone->pages_scanned,
(zone_is_all_unreclaimable(zone) ? "yes" : "no")

3
mm/rmap.c
View file

@ -1202,7 +1202,6 @@ int try_to_unmap(struct page *page, int migration)
return ret;
}
#ifdef CONFIG_UNEVICTABLE_LRU
/**
* try_to_munlock - try to munlock a page
* @page: the page to be munlocked
@ -1226,4 +1225,4 @@ int try_to_munlock(struct page *page)
else
return try_to_unmap_file(page, 1, 0);
}
#endif

17
mm/vmscan.c
View file

@ -514,7 +514,6 @@ int remove_mapping(struct address_space *mapping, struct page *page)
*
* lru_lock must not be held, interrupts must be enabled.
*/
#ifdef CONFIG_UNEVICTABLE_LRU
void putback_lru_page(struct page *page)
{
int lru;
@ -568,20 +567,6 @@ redo:
put_page(page); /* drop ref from isolate */
}
#else /* CONFIG_UNEVICTABLE_LRU */
void putback_lru_page(struct page *page)
{
int lru;
VM_BUG_ON(PageLRU(page));
lru = !!TestClearPageActive(page) + page_is_file_cache(page);
lru_cache_add_lru(page, lru);
put_page(page);
}
#endif /* CONFIG_UNEVICTABLE_LRU */
/*
* shrink_page_list() returns the number of reclaimed pages
*/
@ -2470,7 +2455,6 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
}
#endif
#ifdef CONFIG_UNEVICTABLE_LRU
/*
* page_evictable - test whether a page is evictable
* @page: the page to test
@ -2717,4 +2701,3 @@ void scan_unevictable_unregister_node(struct node *node)
sysdev_remove_file(&node->sysdev, &attr_scan_unevictable_pages);
}
#endif

4
mm/vmstat.c
View file

@ -629,10 +629,8 @@ static const char * const vmstat_text[] = {
"nr_active_anon",
"nr_inactive_file",
"nr_active_file",
#ifdef CONFIG_UNEVICTABLE_LRU
"nr_unevictable",
"nr_mlock",
#endif
"nr_anon_pages",
"nr_mapped",
"nr_file_pages",
@ -687,7 +685,6 @@ static const char * const vmstat_text[] = {
"htlb_buddy_alloc_success",
"htlb_buddy_alloc_fail",
#endif
#ifdef CONFIG_UNEVICTABLE_LRU
"unevictable_pgs_culled",
"unevictable_pgs_scanned",
"unevictable_pgs_rescued",
@ -697,7 +694,6 @@ static const char * const vmstat_text[] = {
"unevictable_pgs_stranded",
"unevictable_pgs_mlockfreed",
#endif
#endif
};
static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,