acrn-kernel/include/linux
Andy Whitcroft cdfd4325c0 mm: record MAP_NORESERVE status on vmas and fix small page mprotect reservations
With Mel's hugetlb private reservation support patches applied, strict
overcommit semantics are applied to both shared and private huge page
mappings.  This can be a problem if an application relied on unlimited
overcommit semantics for private mappings.  An example of this would be an
application which maps a huge area with the intention of using it very
sparsely.  These application would benefit from being able to opt-out of
the strict overcommit.  It should be noted that prior to hugetlb
supporting demand faulting all mappings were fully populated and so
applications of this type should be rare.

This patch stack implements the MAP_NORESERVE mmap() flag for huge page
mappings.  This flag has the same meaning as for small page mappings,
suppressing reservations for that mapping.

Thanks to Mel Gorman for reviewing a number of early versions of these
patches.

This patch:

When a small page mapping is created with mmap() reservations are created
by default for any memory pages required.  When the region is read/write
the reservation is increased for every page, no reservation is needed for
read-only regions (as they implicitly share the zero page).  Reservations
are tracked via the VM_ACCOUNT vma flag which is present when the region
has reservation backing it.  When we convert a region from read-only to
read-write new reservations are aquired and VM_ACCOUNT is set.  However,
when a read-only map is created with MAP_NORESERVE it is indistinguishable
from a normal mapping.  When we then convert that to read/write we are
forced to incorrectly create reservations for it as we have no record of
the original MAP_NORESERVE.

This patch introduces a new vma flag VM_NORESERVE which records the
presence of the original MAP_NORESERVE flag.  This allows us to
distinguish these two circumstances and correctly account the reserve.

As well as fixing this FIXME in the code, this makes it much easier to
introduce MAP_NORESERVE support for huge pages as this flag is available
consistantly for the life of the mapping.  VM_ACCOUNT on the other hand is
heavily used at the generic level in association with small pages.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Adam Litke <agl@us.ibm.com>
Cc: Johannes Weiner <hannes@saeurebad.de>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Michael Kerrisk <mtk.manpages@googlemail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-24 10:47:16 -07:00
..
amba
byteorder
can
dvb
hdlc
i2c
isdn
lockd
mfd Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-07-23 18:24:08 -07:00
mlx4
mmc
mtd MTD: handle pci_name() being const 2008-07-21 21:55:03 -07:00
netfilter netfilter: nfnetlink_log: send complete hardware header 2008-07-21 10:11:00 -07:00
netfilter_arp
netfilter_bridge
netfilter_ipv4
netfilter_ipv6
nfsd
raid md: Protect access to mddev->disks list using RCU 2008-07-21 17:05:25 +10:00
rtc
spi Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2008-07-22 13:13:47 -07:00
ssb
sunrpc Merge branch 'for-2.6.27' of git://linux-nfs.org/~bfields/linux 2008-07-20 21:21:46 -07:00
tc_act
tc_ematch
unaligned
usb usb_serial: API all change 2008-07-22 13:03:22 -07:00
8250_pci.h
Kbuild
a.out.h
ac97_codec.h
acct.h
acpi.h
acpi_pmtmr.h
adb.h
adfs_fs.h
adfs_fs_i.h
adfs_fs_sb.h
aer.h
affs_hardblocks.h
agp_backend.h
agpgart.h
aio.h
aio_abi.h
amifd.h
amifdreg.h
amigaffs.h
anon_inodes.h
apm-emulation.h
apm_bios.h
arcdevice.h
arcfb.h
async_tx.h
ata.h
ata_platform.h
atalk.h
atm.h
atm_eni.h
atm_he.h
atm_idt77105.h
atm_nicstar.h
atm_suni.h
atm_tcp.h
atm_zatm.h
atmapi.h
atmarp.h
atmbr2684.h
atmclip.h
atmdev.h
atmel-ssc.h
atmel_pdc.h
atmel_pwm.h
atmel_serial.h
atmel_tc.h
atmioc.h
atmlec.h
atmmpc.h
atmppp.h
atmsap.h
atmsvc.h
attribute_container.h
audit.h
auto_fs.h
auto_fs4.h
auxvec.h execve filename: document and export via auxiliary vector 2008-07-22 09:59:40 -07:00
ax25.h
b1lli.h
b1pcmcia.h
backing-dev.h
backlight.h
baycom.h
bcd.h
bfs_fs.h
binfmts.h
bio.h
bit_spinlock.h
bitmap.h
bitops.h
bitrev.h
blkdev.h
blkpg.h
blktrace_api.h
blockgroup_lock.h
bootmem.h mm: unexport __alloc_bootmem_core() 2008-07-24 10:47:14 -07:00
bottom_half.h
bpqether.h
brcmphy.h
bsg.h
buffer_head.h
bug.h
cache.h
can.h
capability.h
capi.h
cciss_ioctl.h
cd1400.h
cdev.h
cdk.h
cdrom.h
cfag12864b.h
cgroup.h
cgroup_subsys.h
cgroupstats.h
chio.h
circ_buf.h
clk.h
clockchips.h
clocksource.h
cm4000_cs.h
cn_proc.h
coda.h
coda_cache.h
coda_fs_i.h
coda_linux.h
coda_psdev.h
coff.h
com20020.h
compat.h
compiler-gcc.h
compiler-gcc3.h
compiler-gcc4.h
compiler-intel.h
compiler.h
completion.h
comstats.h
concap.h
configfs.h
connector.h
console.h
console_struct.h
consolemap.h
const.h
cpu.h
cpufreq.h
cpuidle.h
cpumask.h Merge branch 'sched/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-23 19:36:53 -07:00
cpuset.h
cramfs_fs.h
cramfs_fs_sb.h
crash_dump.h
crc-ccitt.h
crc-itu-t.h
crc-t10dif.h
crc7.h
crc16.h
crc32.h
crc32c.h
crypto.h
cryptohash.h
ctype.h
cuda.h
cyclades.h
cyclomx.h
cycx_cfm.h
cycx_drv.h
cycx_x25.h
dca.h I/OAT: I/OAT version 3.0 support 2008-07-22 17:30:57 -07:00
dcache.h
dccp.h
dcookies.h
debug_locks.h
debugfs.h debugfs: Implement debugfs_remove_recursive() 2008-07-21 21:54:59 -07:00
debugobjects.h
delay.h
delayacct.h
device-mapper.h dm: introduce merge_bvec_fn 2008-07-21 12:00:37 +01:00
device.h driver core: remove DEVICE_ID_SIZE define 2008-07-21 21:54:53 -07:00
device_cgroup.h
devpts_fs.h
dio.h
dirent.h
display.h
dlm.h
dlm_device.h
dlm_netlink.h
dlm_plock.h
dlmconstants.h
dm-dirty-log.h
dm-io.h
dm-ioctl.h dm: introduce merge_bvec_fn 2008-07-21 12:00:37 +01:00
dm-kcopyd.h
dm9000.h
dma-attrs.h powerpc/cell: Add DMA_ATTR_WEAK_ORDERING dma attribute and use in Cell IOMMU code 2008-07-22 10:39:36 +10:00
dma-mapping.h
dmaengine.h
dmapool.h
dmar.h
dmi.h
dn.h
dnotify.h
dqblk_v1.h
dqblk_v2.h
dqblk_xfs.h
ds1wm.h
ds1286.h
ds17287rtc.h
dtlk.h
dw_dmac.h
edac.h
edd.h
eeprom_93cx6.h
efi.h
efs_fs_sb.h
efs_vh.h
eisa.h driver core: remove DEVICE_NAME_SIZE define 2008-07-21 21:54:53 -07:00
elevator.h
elf-em.h
elf-fdpic.h
elf.h
elfcore-compat.h
elfcore.h
elfnote.h
enclosure.h
err.h
errno.h
errqueue.h
etherdevice.h
ethtool.h
eventfd.h
eventpoll.h
exportfs.h
ext2_fs.h
ext2_fs_sb.h
ext3_fs.h
ext3_fs_i.h
ext3_fs_sb.h
ext3_jbd.h
f75375s.h
fadvise.h
falloc.h
fault-inject.h
fb.h
fcdevice.h
fcntl.h
fd.h
fd1772.h
fddidevice.h
fdreg.h
fdtable.h
fib_rules.h
file.h
filter.h
firewire-cdev.h
firewire-constants.h
firmware-map.h
firmware.h
flat.h
font.h
freezer.h
fs.h fix soft lock up at NFS mount via per-SB LRU-list of unused dentries 2008-07-24 10:47:15 -07:00
fs_enet_pd.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-07-22 19:09:51 -07:00
fs_stack.h
fs_struct.h
fs_uart_pd.h
fsl_devices.h
fsnotify.h
ftrace.h
fuse.h
futex.h
gameport.h
gen_stats.h
genalloc.h
generic_acl.h
generic_serial.h
genetlink.h
genhd.h
getcpu.h
gfp.h page allocator: inline some __alloc_pages() wrappers 2008-07-24 10:47:14 -07:00
gfs2_ondisk.h
gigaset_dev.h
gpio.h
gpio_keys.h
gpio_mouse.h
hardirq.h
harrier_defs.h
hash.h
hayesesp.h
hdlc.h
hdlcdrv.h
hdpu_features.h
hdreg.h
hid-debug.h
hid.h HID: add n-trig digitizer usage 2008-07-23 15:25:21 +02:00
hiddev.h
hidraw.h
highmem.h
highuid.h
hil.h
hil_mlc.h
hippidevice.h
hp_sdc.h
hpet.h
hrtimer.h
htirq.h
hugetlb.h hugetlb: guarantee that COW faults for a process that called mmap(MAP_PRIVATE) on hugetlbfs will succeed 2008-07-24 10:47:16 -07:00
hw_random.h
hwmon-sysfs.h
hwmon-vid.h
hwmon.h
hysdn_if.h
i2c-algo-bit.h
i2c-algo-pca.h
i2c-algo-pcf.h
i2c-algo-sgi.h
i2c-dev.h
i2c-gpio.h
i2c-id.h
i2c-ocores.h
i2c-pca-platform.h
i2c-pnx.h
i2c-pxa.h
i2c.h
i2o-dev.h
i2o.h
i8k.h
i8042.h
ibmtr.h
icmp.h
icmpv6.h
ide.h ide: remove unused PC_FLAG_DRQ_INTERRUPT 2008-07-23 19:56:01 +02:00
idr.h
ieee80211.h
if.h
if_addr.h
if_addrlabel.h
if_arcnet.h
if_arp.h
if_bonding.h
if_bridge.h
if_cablemodem.h
if_ec.h
if_eql.h
if_ether.h
if_fc.h
if_fddi.h
if_frad.h
if_hippi.h
if_infiniband.h
if_link.h
if_ltalk.h
if_macvlan.h
if_packet.h
if_plip.h
if_ppp.h
if_pppol2tp.h
if_pppox.h
if_slip.h
if_strip.h
if_tr.h
if_tun.h
if_tunnel.h
if_vlan.h
igmp.h
ihex.h
in.h
in6.h
in_route.h
inet.h
inet_diag.h
inet_lro.h
inetdevice.h
init.h
init_ohci1394_dma.h
init_task.h
initrd.h
inotify.h
input-polldev.h
input.h Merge master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 into next 2008-07-21 00:55:14 -04:00
interrupt.h
io.h
ioc3.h
ioc4.h
iocontext.h
ioctl.h
iommu-helper.h
ioport.h
ioprio.h
ip.h
ip6_tunnel.h
ipc.h
ipc_namespace.h
ipmi.h
ipmi_msgdefs.h
ipmi_smi.h
ipsec.h
ipv6.h ipv6: __KERNEL__ ifdef struct ipv6_devconf 2008-07-21 13:41:16 -07:00
ipv6_route.h
ipx.h
irda.h
irq.h
irq_cpustat.h
irqflags.h
irqreturn.h
isa.h
isapnp.h
iscsi_ibft.h
isdn.h
isdn_divertif.h
isdn_ppp.h
isdnif.h
isicom.h
iso_fs.h
istallion.h
ivtv.h
ivtvfb.h
ixjuser.h
jbd.h
jbd2.h
jffs2.h
jhash.h
jiffies.h
journal-head.h
joystick.h
kallsyms.h
kbd_diacr.h
kbd_kern.h
kbuild.h
kd.h
kdebug.h
kdev_t.h
kernel.h
kernel_stat.h
kernelcapi.h
kexec.h
key-type.h
key-ui.h
key.h
keyboard.h
keyctl.h
kfifo.h
kgdb.h
klist.h
kmalloc_sizes.h
kmod.h remove CONFIG_KMOD from core kernel code 2008-07-22 19:24:31 +10:00
kobj_map.h
kobject.h kobject: reorder kobject to save space on 64 bit builds 2008-07-21 21:54:56 -07:00
kprobes.h
kref.h
ks0108.h
kthread.h
ktime.h
kvm.h
kvm_host.h
kvm_para.h
kvm_types.h
lapb.h
latencytop.h
lcd.h
leds.h
lguest.h
lguest_launcher.h
libata.h
libps2.h
license.h
limits.h
linkage.h
linux_logo.h
list.h
llc.h
lm_interface.h
lmb.h
lockdep.h
log2.h
loop.h
lp.h
lzo.h
m48t86.h
magic.h
major.h
maple.h
marker.h
math64.h
matroxfb.h
mbcache.h
mbus.h
mc6821.h
mc146818rtc.h
mca-legacy.h
mca.h
mdio-bitbang.h
memcontrol.h
memory.h
memory_hotplug.h
mempolicy.h
mempool.h
memstick.h
meye.h
migrate.h
mii.h
minix_fs.h
miscdevice.h
mm.h mm: record MAP_NORESERVE status on vmas and fix small page mprotect reservations 2008-07-24 10:47:16 -07:00
mm_inline.h
mm_types.h
mman.h
mmiotrace.h
mmtimer.h
mmzone.h
mnt_namespace.h
mod_devicetable.h
module.h module: turn longs into ints for module sizes 2008-07-22 19:24:27 +10:00
moduleloader.h
moduleparam.h
mount.h
mpage.h
mqueue.h
mroute.h
mroute6.h
msdos_fs.h
msg.h
msi.h
mtio.h
mutex-debug.h
mutex.h
mv643xx.h
mv643xx_eth.h
mv643xx_i2c.h
n_r3964.h
namei.h
nbd.h
ncp.h
ncp_fs.h
ncp_fs_i.h
ncp_fs_sb.h
ncp_mount.h
ncp_no.h
neighbour.h
net.h
netdevice.h net: Fix build failure with 'make mandocs'. 2008-07-22 14:09:06 -07:00
netfilter.h
netfilter_arp.h
netfilter_bridge.h
netfilter_decnet.h
netfilter_ipv4.h
netfilter_ipv6.h
netlink.h
netpoll.h
netrom.h
nfs.h
nfs2.h
nfs3.h
nfs4.h
nfs4_acl.h
nfs4_mount.h
nfs_fs.h
nfs_fs_i.h
nfs_fs_sb.h
nfs_idmap.h
nfs_iostat.h
nfs_mount.h
nfs_page.h
nfs_xdr.h
nfsacl.h
nfsd_idmap.h
nl80211.h
nls.h
nmi.h
node.h
nodemask.h
notifier.h
nsc_gpio.h
nsproxy.h
nubus.h
numa.h
nvram.h
of.h
of_device.h
of_gpio.h of_gpio: Should use new <linux/gpio.h> header 2008-07-22 10:39:30 +10:00
of_i2c.h
of_platform.h
oom.h
oprofile.h
page-flags.h slob: record page flag overlays explicitly 2008-07-24 10:47:15 -07:00
page-isolation.h
pageblock-flags.h
pagemap.h mapping_set_error: add unlikely() 2008-07-24 10:47:15 -07:00
pagevec.h
param.h
parport.h
parport_pc.h
parser.h
patchkey.h
path.h
pci-acpi.h
pci-aspm.h
pci.h
pci_hotplug.h
pci_ids.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx 2008-07-23 12:03:18 -07:00
pci_regs.h
pcieport_if.h
pda_power.h
percpu.h
percpu_counter.h
personality.h
pfkeyv2.h
pfn.h
pg.h
phantom.h
phonedev.h
phy.h
phy_fixed.h
pid.h
pid_namespace.h
pim.h
pipe_fs_i.h
pkt_cls.h
pkt_sched.h
pktcdvd.h
platform_device.h
plist.h
pm.h
pm_legacy.h
pm_qos_params.h
pm_wakeup.h
pmu.h
pnp.h
poison.h
poll.h
posix-timers.h
posix_acl.h
posix_acl_xattr.h
posix_types.h
power_supply.h
ppdev.h
ppp-comp.h
ppp_channel.h
ppp_defs.h
prctl.h
preempt.h
prefetch.h
prio_heap.h
prio_tree.h
proc_fs.h netns: make get_proc_net() static 2008-07-22 14:19:19 -07:00
profile.h
proportions.h
ptrace.h
pwm.h
pwm_backlight.h
qnx4_fs.h
qnxtypes.h
quicklist.h
quota.h
quotaio_v1.h
quotaio_v2.h
quotaops.h
radeonfb.h
radix-tree.h
raid_class.h
ramfs.h
random.h
raw.h
rbtree.h
rcuclassic.h
rculist.h
rcupdate.h
rcupreempt.h
rcupreempt_trace.h
reboot.h
reciprocal_div.h
regset.h
reiserfs_acl.h
reiserfs_fs.h
reiserfs_fs_i.h
reiserfs_fs_sb.h
reiserfs_xattr.h
relay.h
res_counter.h
resource.h
resume-trace.h
rfkill.h
rio.h
rio_drv.h
rio_ids.h
rio_regs.h
rmap.h
romfs_fs.h
root_dev.h
rose.h
route.h
rslib.h
rtc-v3020.h
rtc.h
rtmutex.h
rtnetlink.h
rwsem-spinlock.h
rwsem.h
rxrpc.h
sc26198.h
scatterlist.h sg: reimplement sg mapping iterator 2008-07-23 14:42:09 +02:00
scc.h
sched.h add a helper function to test if an object is on the stack 2008-07-24 10:47:14 -07:00
screen_info.h
sctp.h
scx200.h
scx200_gpio.h
sdla.h
seccomp.h
securebits.h
security.h
selection.h
selinux.h
selinux_netlink.h
sem.h
semaphore.h
seq_file.h
seq_file_net.h
seqlock.h
serial.h
serial167.h
serialP.h
serial_8250.h
serial_core.h
serial_pnx8xxx.h
serial_reg.h
serial_sci.h
serio.h
shm.h
shmem_fs.h
signal.h
signalfd.h
skbuff.h
slab.h
slab_def.h
slob_def.h
slub_def.h
sm501-regs.h
sm501.h
smb.h
smb_fs.h
smb_fs_i.h
smb_fs_sb.h
smb_mount.h
smbno.h
smc91x.h
smc911x.h
smp.h
smp_lock.h
snmp.h
socket.h
sockios.h
som.h
sonet.h
sony-laptop.h
sonypi.h
sort.h
sound.h
soundcard.h
spinlock.h
spinlock_api_smp.h
spinlock_api_up.h
spinlock_types.h
spinlock_types_up.h
spinlock_up.h
splice.h
srcu.h
stacktrace.h
stallion.h
start_kernel.h
stat.h
statfs.h
stddef.h
stop_machine.h
string.h move memory_read_from_buffer() from fs.h to string.h 2008-07-24 10:47:13 -07:00
stringify.h
superhyway.h
suspend.h
suspend_ioctls.h
svga.h
swap.h
swapops.h
synclink.h synclink_gt: add serial bit order control 2008-07-22 13:03:29 -07:00
sys.h
syscalls.h
sysctl.h
sysdev.h sysdev: Add utility functions for simple int/ulong variable sysdev attributes 2008-07-21 21:55:02 -07:00
sysfs.h driver core: Suppress sysfs warnings for device_rename(). 2008-07-21 21:55:01 -07:00
sysrq.h
sysv_fs.h
task_io_accounting.h
task_io_accounting_ops.h
taskstats.h
taskstats_kern.h
tc.h
tcp.h
telephony.h
termios.h
textsearch.h
textsearch_fsm.h
tfrc.h
thermal.h
thread_info.h
threads.h
tick.h
tifm.h
time.h
timer.h
timerfd.h
times.h
timex.h
tiocl.h
tipc.h
tipc_config.h
topology.h
toshiba.h
transport_class.h
trdevice.h
tsacct_kern.h
tty.h tty: Split ldisc code into its own file 2008-07-22 13:03:27 -07:00
tty_driver.h tty: rework break handling 2008-07-22 13:03:28 -07:00
tty_flip.h
tty_ldisc.h
types.h
uaccess.h
udf_fs_i.h
udp.h
uinput.h
uio.h
uio_driver.h UIO: minor style and comment fixes 2008-07-21 21:54:55 -07:00
ultrasound.h
un.h
unistd.h
unwind.h
usb.h USB: Force unbinding of drivers lacking reset_resume or other methods 2008-07-21 15:16:40 -07:00
usb_usual.h
usbdevice_fs.h USB: remove CVS keywords 2008-07-21 15:15:55 -07:00
user.h
user_namespace.h
utime.h
uts.h
utsname.h
vermagic.h
veth.h
vfs.h
via.h
video_decoder.h
video_encoder.h
video_output.h
videodev.h
videodev2.h
videotext.h
virtio.h
virtio_9p.h
virtio_balloon.h
virtio_blk.h
virtio_config.h
virtio_console.h
virtio_net.h
virtio_pci.h
virtio_ring.h
virtio_rng.h
vmalloc.h
vmstat.h mm/vmstat.c: proper externs 2008-07-24 10:47:14 -07:00
vt.h
vt_buffer.h
vt_kern.h
w1-gpio.h
wait.h
wanrouter.h
watchdog.h
wireless.h
wm97xx.h
workqueue.h
writeback.h
x25.h
xattr.h
xfrm.h
xilinxfb.h
yam.h
zconf.h
zlib.h
zorro.h
zorro_ids.h
zutil.h