Mel Gorman c78e93630d mm: do not walk all of system memory during show_mem ... It has been reported on very large machines that show_mem is taking almost 5 minutes to display information. This is a serious problem if there is an OOM storm. The bulk of the cost is in show_mem doing a very expensive PFN walk to give us the following information Total RAM: Also available as totalram_pages Highmem pages: Also available as totalhigh_pages Reserved pages: Can be inferred from the zone structure Shared pages: PFN walk required Unshared pages: PFN walk required Quick pages: Per-cpu walk required Only the shared/unshared pages requires a full PFN walk but that information is useless. It is also inaccurate as page pins of unshared pages would be accounted for as shared. Even if the information was accurate, I'm struggling to think how the shared/unshared information could be useful for debugging OOM conditions. Maybe it was useful before rmap existed when reclaiming shared pages was costly but it is less relevant today. The PFN walk could be optimised a bit but why bother as the information is useless. This patch deletes the PFN walker and infers the total RAM, highmem and reserved pages count from struct zone. It omits the shared/unshared page usage on the grounds that it is useless. It also corrects the reporting of HighMem as HighMem/MovableOnly as ZONE_MOVABLE has similar problems to HighMem with respect to lowmem/highmem exhaustion. Signed-off-by: Mel Gorman <mgorman@suse.de> Cc: David Rientjes <rientjes@google.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2013-11-13 12:09:09 +09:00
..
fonts	lib: Move fonts from drivers/video/console/ to lib/fonts/	2013-06-28 10:28:22 +02:00
lz4	lz4: fix compression/decompression signedness mismatch	2013-09-11 15:59:45 -07:00
lzo	lib/lzo: Update LZO compression to current upstream version	2013-02-20 19:36:01 +01:00
mpi	alpha: Modernize lib/mpi/longlong.h	2013-07-19 13:54:23 -07:00
raid6	md update for v3.12	2013-09-10 13:03:41 -07:00
reed_solomon
xz	decompressors: fix typo "POWERPC"	2013-03-13 15:21:48 -07:00
zlib_deflate
zlib_inflate
.gitignore	X.509: Implement simple static OID registry	2012-10-08 13:50:18 +10:30
argv_split.c	argv_split(): teach it to handle mutable strings	2013-04-29 18:28:19 -07:00
asn1_decoder.c	Nothing all that exciting; a new module-from-fd syscall for those who want	2012-12-19 07:55:08 -08:00
atomic64.c	lib: atomic64: Initialize locks statically to fix early users	2012-12-20 13:50:16 -08:00
atomic64_test.c	atomic64_test: simplify the #ifdef for atomic64_dec_if_positive() test	2012-07-30 17:25:16 -07:00
audit.c
average.c
bcd.c	usb/core: use bin2bcd() for bcdDevice in RH	2012-09-10 11:13:16 -07:00
bch.c
bitmap.c	propagate name change to comments in kernel source	2012-12-06 10:39:54 +01:00
bitrev.c
bsearch.c
btree.c	btree: catch NULL value before it does harm	2012-06-07 14:43:55 -07:00
bug.c	taint: add explicit flag to show whether lock dep is still OK.	2013-01-21 17:17:57 +10:30
build_OID_registry	X.509: do not emit any informational output	2013-06-19 17:54:06 +02:00
bust_spinlocks.c	printk: Provide a wake_up_klogd() off-case	2013-03-22 16:41:20 -07:00
check_signature.c
checksum.c	asm-generic headers: Allow yet more arch overrides in checksum.h	2013-02-11 20:00:33 +05:30
clz_ctz.c	lib: add weak clz/ctz functions	2013-07-09 10:33:30 -07:00
clz_tab.c
cmdline.c
cordic.c
cpu-notifier-error-inject.c	cpu: rewrite cpu-notifier-error-inject module	2012-07-30 17:25:22 -07:00
cpu_rmap.c	Remove GENERIC_HARDIRQ config option	2013-09-13 15:09:52 +02:00
cpumask.c	bootmem: fix wrong call parameter for free_bootmem()	2012-12-11 17:22:28 -08:00
crc-ccitt.c
crc-itu-t.c
crc-t10dif.c	crypto: crct10dif - Add fallback for broken initrds	2013-09-12 15:31:34 +10:00
crc7.c
crc8.c
crc16.c
crc32.c	lib/crc32: update the comments of crc32_{be,le}_generic()	2013-09-11 15:58:38 -07:00
crc32defs.h
ctype.c
debug_locks.c	mutex: Add support for wound/wait style locks	2013-06-26 12:10:56 +02:00
debugobjects.c	debugobjects: Make debug_object_activate() return status	2013-08-18 17:39:55 -07:00
dec_and_lock.c
decompress.c	lib: add support for LZ4-compressed kernel	2013-07-09 10:33:30 -07:00
decompress_bunzip2.c
decompress_inflate.c	lib/decompressors: fix "no limit" output buffer length	2013-09-11 15:58:38 -07:00
decompress_unlz4.c	lib: add support for LZ4-compressed kernel	2013-07-09 10:33:30 -07:00
decompress_unlzma.c
decompress_unlzo.c	lib/lzo: Rename lzo1x_decompress.c to lzo1x_decompress_safe.c	2013-02-20 19:36:00 +01:00
decompress_unxz.c
devres.c	lib/devres.c: fix misplaced #endif	2013-02-27 19:10:09 -08:00
digsig.c	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2013-02-21 08:18:12 -08:00
div64.c	math64: New separate div64_u64_rem helper	2013-08-23 09:02:14 -04:00
dma-debug.c	dma-debug: update DMA debug API to better handle multiple mappings of a buffer	2013-03-22 16:41:20 -07:00
dump_stack.c	x86, asmlinkage: Make dump_stack visible	2013-08-06 14:21:01 -07:00
dynamic_debug.c	dynamic debug: line queries failing due to uninitialized local variable	2013-08-28 12:10:53 -07:00
dynamic_queue_limits.c	bql: Avoid possible inconsistent calculation.	2012-05-31 18:18:17 -04:00
earlycpio.c	earlycpio.c: Fix the confusing comment of find_cpio_data().	2013-08-14 23:24:01 +02:00
extable.c
fault-inject.c	debugfs: add get/set for atomic types	2013-06-03 13:55:01 -07:00
fdt.c	of/lib: Allow scripts/dtc/libfdt to be used from kernel code	2012-07-23 13:54:52 +01:00
fdt_ro.c	of/lib: Allow scripts/dtc/libfdt to be used from kernel code	2012-07-23 13:54:52 +01:00
fdt_rw.c	of/lib: Allow scripts/dtc/libfdt to be used from kernel code	2012-07-23 13:54:52 +01:00
fdt_strerror.c	of/lib: Allow scripts/dtc/libfdt to be used from kernel code	2012-07-23 13:54:52 +01:00
fdt_sw.c	of/lib: Allow scripts/dtc/libfdt to be used from kernel code	2012-07-23 13:54:52 +01:00
fdt_wip.c	of/lib: Allow scripts/dtc/libfdt to be used from kernel code	2012-07-23 13:54:52 +01:00
find_last_bit.c
find_next_bit.c
flex_array.c
flex_proportions.c	lib/flex_proportions.c: fix corruption of denominator in flexible proportions	2012-09-25 08:59:21 -07:00
gcd.c	lib/gcd.c: prevent possible div by 0	2012-10-06 03:04:57 +09:00
gen_crc32table.c	sections: fix const sections for crc32 table	2012-10-06 03:04:46 +09:00
genalloc.c	lib/genalloc.c: correct dev_get_gen_pool documentation	2013-09-11 15:58:38 -07:00
halfmd4.c
hexdump.c	lib: introduce upper case hex ascii helpers	2013-09-20 15:38:26 -04:00
hweight.c
idr.c	idr: print a stack dump after ida_remove warning	2013-07-03 16:08:04 -07:00
inflate.c
int_sqrt.c	lib/int_sqrt.c: optimize square root algorithm	2013-04-29 18:28:19 -07:00
interval_tree.c	mm: interval tree updates	2012-10-09 16:22:40 +09:00
interval_tree_test_main.c	random32: rename random32 to prandom	2012-12-17 17:15:26 -08:00
iomap.c
iomap_copy.c
iommu-helper.c
ioremap.c
iovec.c	Hoist memcpy_fromiovec/memcpy_toiovec into lib/	2013-05-20 10:24:22 +09:30
irq_regs.c
is_single_threaded.c
jedec_ddr_data.c
kasprintf.c	lib/kasprintf.c: use kmalloc_track_caller() to get accurate traces for kvasprintf	2012-10-11 08:50:15 +09:00
Kconfig	Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2013-09-07 14:31:18 -07:00
Kconfig.debug	TTY/Serial driver updates for 3.13-rc1	2013-11-07 12:17:06 +09:00
Kconfig.kgdb	treewide: Fix typo in printk	2013-06-18 13:48:45 +02:00
Kconfig.kmemcheck
kfifo.c	kfifo: fix kfifo_alloc() and kfifo_init()	2013-02-27 19:10:23 -08:00
klist.c	klist: del waiter from klist_remove_waiters before wakeup waitting process	2013-05-21 10:16:39 -07:00
kobject.c	Revert "sysfs: drop kobj_ns_type handling"	2013-11-07 20:47:28 +09:00
kobject_uevent.c	netlink: hide struct module parameter in netlink_kernel_create	2012-09-08 18:46:30 -04:00
kstrtox.c	kstrto*: add documentation	2012-12-17 17:15:22 -08:00
kstrtox.h
lcm.c
libcrc32c.c
list_debug.c	rcu: Fix broken strings in RCU's source code.	2012-07-06 06:01:49 -07:00
list_sort.c	lib/: rename random32() to prandom_u32()	2013-04-29 18:28:42 -07:00
llist.c	llist: fix/simplify llist_add() and llist_add_batch()	2013-07-13 13:29:24 +04:00
locking-selftest-hardirq.h
locking-selftest-mutex.h
locking-selftest-rlock-hardirq.h
locking-selftest-rlock-softirq.h
locking-selftest-rlock.h
locking-selftest-rsem.h
locking-selftest-softirq.h
locking-selftest-spin-hardirq.h
locking-selftest-spin-softirq.h
locking-selftest-spin.h
locking-selftest-wlock-hardirq.h
locking-selftest-wlock-softirq.h
locking-selftest-wlock.h
locking-selftest-wsem.h
locking-selftest.c	sched: Introduce preempt_count accessor functions	2013-09-25 14:07:32 +02:00
lockref.c	The main feature of interest this time is quota updates. There are	2013-11-11 07:11:00 +09:00
lru_cache.c	lru_cache: introduce lc_get_cumulative()	2013-03-22 22:17:36 -06:00
Makefile	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2013-09-12 16:11:45 -07:00
md5.c
memory-notifier-error-inject.c	memory: memory notifier error injection module	2012-07-30 17:25:22 -07:00
memweight.c	string: introduce memweight()	2012-07-30 17:25:16 -07:00
net_utils.c	net: core: move mac_pton() to lib/net_utils.c	2013-06-05 12:00:27 -07:00
nlattr.c	netlink: add minlen validation for the new signed types	2012-08-30 13:11:46 -04:00
notifier-error-inject.c	mode_t, whack-a-mole at 11...	2013-04-09 14:13:05 -04:00
notifier-error-inject.h	fault-injection: notifier error injection	2012-07-30 17:25:22 -07:00
of-reconfig-notifier-error-inject.c	powerpc+of: Rename and fix OF reconfig notifier error inject module	2012-12-14 10:32:52 +11:00
oid_registry.c	Give the OID registry file module info to avoid kernel tainting	2013-05-05 14:38:00 -07:00
parser.c	lib/parser.c: fix up comments for valid return values from match_number	2013-02-21 17:22:25 -08:00
pci_iomap.c
percpu-refcount.c	percpu_refcount: export symbols	2013-10-16 21:35:53 -07:00
percpu-rwsem.c	percpu_rw_semaphore: add lockdep annotations	2012-12-17 17:15:18 -08:00
percpu_counter.c	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
percpu_ida.c	idr: Percpu ida	2013-09-09 14:29:15 -07:00
plist.c	lib/plist.c: make plist test announcements KERN_DEBUG	2012-10-06 03:04:58 +09:00
pm-notifier-error-inject.c	PM: PM notifier error injection module	2012-07-30 17:25:22 -07:00
prio_heap.c
proportions.c
radix-tree.c	lib/radix-tree.c: make radix_tree_node_alloc() work correctly within interrupt	2013-09-11 15:59:36 -07:00
random32.c	prandom: introduce prandom_bytes() and prandom_bytes_state()	2012-12-17 17:15:26 -08:00
ratelimit.c
rational.c
rbtree.c	rbtree: add postorder iteration functions	2013-09-11 15:59:19 -07:00
rbtree_test.c	rbtree_test: add test for postorder iteration	2013-09-11 15:59:20 -07:00
reciprocal_div.c
rwsem-spinlock.c	rwsem: simplify __rwsem_do_wake	2013-05-07 07:20:16 -07:00
rwsem.c	rwsem: check counter to avoid cmpxchg calls	2013-05-07 16:11:51 -07:00
scatterlist.c	lib/scatterlist.c: don't flush_kernel_dcache_page on slab page	2013-10-31 16:58:13 -07:00
sha1.c
show_mem.c	mm: do not walk all of system memory during show_mem	2013-11-13 12:09:09 +09:00
smp_processor_id.c	sched: Introduce preempt_count accessor functions	2013-09-25 14:07:32 +02:00
sort.c
spinlock_debug.c	lib/spinlock_debug: avoid livelock in do_raw_spin_lock()	2012-10-06 03:04:57 +09:00
stmp_device.c
string.c
string_helpers.c	lib/string_helpers: introduce generic string_unescape	2013-04-30 17:04:03 -07:00
strncpy_from_user.c	word-at-a-time: make the interfaces truly generic	2012-05-26 11:33:40 -07:00
strnlen_user.c	lib: Fix generic strnlen_user for 32-bit big-endian machines	2012-05-27 20:59:46 -07:00
swiotlb.c	swiotlb: replace dma_length with sg_dma_len() macro	2013-08-09 11:28:42 -04:00
syscall.c
test-kstrtox.c	lib/test-kstrtox.c: mark const init data with __initconst instead of __initdata	2012-05-29 16:22:32 -07:00
test-string_helpers.c	lib/string_helpers: introduce generic string_unescape	2013-04-30 17:04:03 -07:00
textsearch.c
timerqueue.c
ts_bm.c
ts_fsm.c
ts_kmp.c
ucs2_string.c	Move utf16 functions to kernel core and rename	2013-04-15 21:23:03 +01:00
usercopy.c	Kconfig: consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS	2013-04-30 17:04:09 -07:00
uuid.c	uuid: use prandom_bytes()	2013-04-29 18:28:42 -07:00
vsprintf.c	add formats for dentry/file pathnames	2013-09-04 00:13:11 -04:00