David Howells 8feae13110 NOMMU: Make VMAs per MM as for MMU-mode linux ... Make VMAs per mm_struct as for MMU-mode linux. This solves two problems: (1) In SYSV SHM where nattch for a segment does not reflect the number of shmat's (and forks) done. (2) In mmap() where the VMA's vm_mm is set to point to the parent mm by an exec'ing process when VM_EXECUTABLE is specified, regardless of the fact that a VMA might be shared and already have its vm_mm assigned to another process or a dead process. A new struct (vm_region) is introduced to track a mapped region and to remember the circumstances under which it may be shared and the vm_list_struct structure is discarded as it's no longer required. This patch makes the following additional changes: (1) Regions are now allocated with alloc_pages() rather than kmalloc() and with no recourse to __GFP_COMP, so the pages are not composite. Instead, each page has a reference on it held by the region. Anything else that is interested in such a page will have to get a reference on it to retain it. When the pages are released due to unmapping, each page is passed to put_page() and will be freed when the page usage count reaches zero. (2) Excess pages are trimmed after an allocation as the allocation must be made as a power-of-2 quantity of pages. (3) VMAs are added to the parent MM's R/B tree and mmap lists. As an MM may end up with overlapping VMAs within the tree, the VMA struct address is appended to the sort key. (4) Non-anonymous VMAs are now added to the backing inode's prio list. (5) Holes may be punched in anonymous VMAs with munmap(), releasing parts of the backing region. The VMA and region structs will be split if necessary. (6) sys_shmdt() only releases one attachment to a SYSV IPC shared memory segment instead of all the attachments at that addresss. Multiple shmat()'s return the same address under NOMMU-mode instead of different virtual addresses as under MMU-mode. (7) Core dumping for ELF-FDPIC requires fewer exceptions for NOMMU-mode. (8) /proc/maps is now the global list of mapped regions, and may list bits that aren't actually mapped anywhere. (9) /proc/meminfo gains a line (tagged "MmapCopy") that indicates the amount of RAM currently allocated by mmap to hold mappable regions that can't be mapped directly. These are copies of the backing device or file if not anonymous. These changes make NOMMU mode more similar to MMU mode. The downside is that NOMMU mode requires some extra memory to track things over NOMMU without this patch (VMAs are no longer shared, and there are now region structs). Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Mike Frysinger <vapier.adi@gmail.com> Acked-by: Paul Mundt <lethal@linux-sh.org>		2009-01-08 12:04:47 +00:00
..
ABI	mm: show node to memory section relationship with symlinks in sysfs	2009-01-06 15:59:00 -08:00
DocBook	wimax: Makefile, Kconfig and docbook linkage for the stack	2009-01-07 10:00:17 -08:00
PCI	PCI: Add pci_clear_master() as opposite of pci_set_master()	2009-01-07 11:13:23 -08:00
RCU	Merge branch 'core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2008-12-30 16:10:19 -08:00
accounting	.gitignore updates	2008-10-30 11:38:45 -07:00
acpi	ACPI: update debug parameter documentation	2008-11-07 21:45:29 -05:00
aoe	aoe: user can ask driver to forget previously detected devices	2008-02-08 09:22:31 -08:00
arm	Merge branch 'for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa-linux-2.6 into devel	2008-12-29 18:08:11 +00:00
auxdisplay	.gitignore updates	2008-10-30 11:38:45 -07:00
blackfin	Blackfin arch: Add document about bfin-gpio	2009-01-07 23:14:38 +08:00
block	Documentation: remove reference to ll_rw_blk.c and moved drivers/block/elevator.c	2008-12-29 08:28:43 +01:00
blockdev	Create/use more directory structure in the Documentation/ tree.	2008-11-14 17:28:53 +00:00
cdrom	doc/cdrom: Trvial documentation error, file not present	2008-10-10 08:22:44 +02:00
cgroups	freezer_cg: disable writing freezer.state of root cgroup	2008-11-12 17:17:16 -08:00
connector	.gitignore updates	2008-10-30 11:38:45 -07:00
console	Typo: fro -> from	2007-07-19 10:04:47 -07:00
controllers	sched: add hierarchical accounting to cpu accounting controller	2008-11-11 12:13:28 +01:00
cpu-freq	doc: Update sh cpufreq documentation.	2008-12-22 18:44:47 +09:00
cpuidle	cpuidle: Add Documentation	2008-02-14 00:16:13 -05:00
cris	fix random typos	2008-10-16 11:21:30 -07:00
crypto	[CRYPTO] doc: Update api-intro.txt	2008-01-11 08:16:14 +11:00
development-process	Add the development process document	2008-10-16 11:51:30 -06:00
device-mapper	dm crypt: add documentation	2008-04-25 13:27:03 +01:00
driver-model	Driver core: Update some prototypes in platform.txt	2008-02-02 15:14:49 -08:00
dvb	V4L/DVB (9812): [PATCH] short help for Technisat cards to select the right configuration	2008-12-30 09:38:35 -02:00
early-userspace	Documentation: Remove last references to BitKeeper.	2008-04-21 22:19:05 +00:00
fault-injection	fault-injection: fix example scripts in documentation	2007-07-16 09:05:45 -07:00
fb	[ARM] pxafb: add support for overlay1 and overlay2 as framebuffer devices	2008-12-29 18:00:04 +08:00
filesystems	Merge branch 'proc-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/adobriyan/proc	2009-01-07 12:01:06 -08:00
firmware_class	firmware_sample_driver.c: fix coding style	2008-04-21 22:23:30 +00:00
frv	move frv docs one level up	2008-02-03 15:54:28 +02:00
hwmon	Merge branch 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6	2009-01-07 11:59:51 -08:00
i2c	i2c: The i2c mailing list is moving	2008-10-30 15:55:47 +01:00
i2o	documentation: convert the Documentation directory to UTF-8	2007-05-09 08:58:19 +02:00
ia64	.gitignore updates	2008-10-30 11:38:45 -07:00
ide	ide: update warm-plug HOWTO	2009-01-06 17:21:00 +01:00
infiniband	IB/umad: Add P_Key index support	2007-10-09 19:59:15 -07:00
input	Merge commit 'v2.6.28-rc9' into next	2008-12-20 04:54:54 -05:00
ioctl	documentation: update header file paths	2009-01-06 15:59:28 -08:00
isdn	Rationalise Randy's address a bit	2008-10-30 11:38:47 -07:00
ja_JP	HOWTO: Sync patch for jp_JP/HOWTO	2008-10-29 15:03:50 -07:00
kbuild	kbuild: fix typos (s/bin_shipped/bin.o_shipped/) in Documentation	2009-01-07 21:44:23 +01:00
kdump	powerpc: Support for relocatable kdump kernel	2008-10-22 15:01:22 +11:00
ko_KR	HOWTO: update misspelling and word incorrected	2007-12-17 10:33:19 -08:00
laptops	trivial: fix an -> a typos in documentation and comments	2009-01-06 11:28:07 +01:00
lguest	lguest: move the initial guest page table creation code to the host	2008-12-30 09:26:11 +10:30
m68k	[SCSI] 53c7xx: fix removal fallout	2008-01-11 18:22:30 -06:00
make	Documentation/make/headers_install.txt	2007-10-17 08:43:05 -07:00
mips	documentation: update header file paths	2009-01-06 15:59:28 -08:00
mn10300	mn10300: add the MN10300/AM33 architecture to the kernel	2008-02-08 09:22:30 -08:00
mtd	[MTD] [NAND] nand_ecc.c: rewrite for improved performance	2008-08-16 10:55:33 +01:00
namespaces	The namespaces compatibility list doc	2007-11-29 09:24:53 -08:00
netlabel	Fix occurrences of "the the "	2007-05-09 08:57:56 +02:00
networking	trivial: fix an -> a typos in documentation and comments	2009-01-06 11:28:07 +01:00
parisc	…
pcmcia	.gitignore updates	2008-10-30 11:38:45 -07:00
power	pm: document use of RTC in pm_trace	2008-10-16 11:21:29 -07:00
powerpc	documentation: update header file paths	2009-01-06 15:59:28 -08:00
prctl	generic, x86: add tests for prctl PR_GET_TSC and PR_SET_TSC	2008-04-19 19:19:55 +02:00
s390	documentation: update s390 header file paths	2009-01-06 15:59:28 -08:00
scheduler	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2008-12-28 12:27:58 -08:00
scsi	trivial: Fix misspelling of "firmware" in docs for ncr53c8xx/sym53c8xx	2009-01-06 11:28:09 +01:00
serial	Create/use more directory structure in the Documentation/ tree.	2008-11-14 17:28:53 +00:00
sh	sh: Kill off remaining CONFIG_SH_KGDB bits.	2008-12-22 18:44:05 +09:00
sound	Merge branch 'topic/oxygen' into to-push	2008-12-25 11:40:30 +01:00
sparc	sparc: Remove Documentation/sparc/sbus_drivers.txt	2008-08-29 02:15:25 -07:00
spi	hwmon: (lm70) Code streamlining and cleanup	2009-01-07 16:37:34 +01:00
sysctl	mm: add dirty_background_bytes and dirty_bytes sysctls	2009-01-06 15:59:03 -08:00
telephony	remove mention of CONFIG_KMOD from documentation	2008-07-22 19:24:29 +10:00
thermal	thermal: update the documentation	2008-04-29 02:49:47 -04:00
timers	hpet: /dev/hpet - fixes and cleanup	2008-07-31 18:45:41 +02:00
tracers	tracing, doc: update mmiotrace documentation	2008-11-23 20:33:24 +01:00
uml	Fix typos in /Documentation : 'U-Z'	2006-11-30 04:58:40 +01:00
usb	USB: add asynchronous autosuspend/autoresume support	2009-01-07 09:59:53 -08:00
video4linux	V4L/DVB (10157): Add USB ID for the Sil4701 radio from DealExtreme	2009-01-02 17:13:56 -02:00
vm	mm: remove try_to_munlock from vmscan	2009-01-06 15:59:03 -08:00
w1	hdq: documentation for OMAP HDQ	2008-11-12 17:17:18 -08:00
watchdog	.gitignore updates	2008-10-30 11:38:45 -07:00
wimax	i2400m: documentation and instructions for usage	2009-01-07 10:00:18 -08:00
x86	documentation: update header file paths	2009-01-06 15:59:28 -08:00
zh_CN	Chinese: add translation of Codingstyle	2008-01-24 20:40:04 -08:00
00-INDEX	Merge branch 'doc-subdirs' of git://git.kernel.org/pub/scm/linux/kernel/git/rdunlap/linux-docs	2008-11-15 11:51:03 -08:00
BUG-HUNTING	Documentation: add hint about call traces & module symbols to BUG-HUNTING	2008-02-06 10:41:09 -08:00
Changes	[x86 setup] Document grub < 0.93 as broken	2007-08-02 13:50:43 -04:00
CodingStyle	documentation: update CodingStyle tips for Emacs users	2008-07-25 10:53:29 -07:00
DMA-API.txt	DMA-API.txt: fix description of pci_map_sg/dma_map_sg scatterlists handling	2008-12-01 19:55:24 -08:00
DMA-ISA-LPC.txt	Fix typos in /Documentation : 'T''	2006-11-30 04:55:36 +01:00
DMA-attributes.txt	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.txt	documentation: update header file paths	2009-01-06 15:59:28 -08:00
HOWTO	Remove Andrew Morton's http://www.zip.com.au/~akpm/	2008-10-16 11:21:32 -07:00
IO-mapping.txt	…
IPMI.txt	IPMI: new NMI handling	2007-10-18 14:37:32 -07:00
IRQ-affinity.txt	genirq: Expose default irq affinity mask (take 3)	2008-06-05 15:18:30 +02:00
IRQ.txt	[PATCH] genirq: irq: document what an IRQ is	2006-06-29 10:26:25 -07:00
Intel-IOMMU.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
Makefile	docsrc: build Documentation/ sources	2008-08-12 16:07:30 -07:00
ManagementStyle	docs: fix ManagementStyle book name	2008-10-30 11:38:46 -07:00
SAK.txt	Remove Andrew Morton's old email accounts	2008-10-16 11:21:32 -07:00
SELinux.txt	selinux: add support for installing a dummy policy (v2)	2008-08-27 08:54:08 +10:00
SM501.txt	Tweak Documentation/SM501.txt	2007-10-17 08:43:06 -07:00
SecurityBugs	…
Smack.txt	Smack: Simplified Mandatory Access Control Kernel	2008-02-05 09:44:20 -08:00
SubmitChecklist	documentation: explain memory barriers	2008-10-16 11:21:32 -07:00
SubmittingDrivers	Remove Andrew Morton's old email accounts	2008-10-16 11:21:32 -07:00
SubmittingPatches	Merge branch 'docs' of git://git.lwn.net/linux-2.6	2008-10-16 12:18:16 -07:00
VGA-softcursor.txt	…
applying-patches.txt	[PATCH] Docs update: typos, corrections and additions to applying-patches.txt	2006-01-10 08:01:54 -08:00
atomic_ops.txt	documentation: atomic_add_unless() doesn't imply mb() on failure	2008-02-23 17:52:36 -08:00
basic_profiling.txt	…
binfmt_misc.txt	documentation: convert the Documentation directory to UTF-8	2007-05-09 08:58:19 +02:00
braille-console.txt	Basic braille screen reader support	2008-04-30 08:29:52 -07:00
bt8xxgpio.txt	gpio: add bt8xxgpio driver	2008-07-25 10:53:30 -07:00
c2port.txt	Add c2 port support	2008-11-12 17:17:18 -08:00
cachetlb.txt	remove unused flush_tlb_pgtables	2007-10-19 11:53:34 -07:00
cpu-hotplug.txt	x86: use possible_cpus=NUM to extend the possible cpus allowed	2008-12-18 12:08:05 +01:00
cpu-load.txt	[PATCH] Documentation: CPU load calculation description	2007-03-01 14:53:39 -08:00
cpusets.txt	container freezer: document the cgroup freezer subsystem.	2008-10-20 08:52:34 -07:00
cputopology.txt	sysfs: add documentation to cputopology.txt for system cpumasks	2008-12-19 17:47:12 +10:30
credentials.txt	CRED: Documentation	2008-11-14 10:39:26 +11:00
dcdbas.txt	[PATCH] dcdbas: add Dell Systems Management Base Driver with sysfs support	2005-09-07 16:57:27 -07:00
debugging-modules.txt	Documentation: Clarify when module debugging actually works.	2008-02-03 15:27:38 +02:00
debugging-via-ohci1394.txt	firewire: fw-ohci: add option for remote debugging	2008-04-18 17:55:33 +02:00
dell_rbu.txt	trivial: fix an -> a typos in documentation and comments	2009-01-06 11:28:07 +01:00
devices.txt	USB: add USB test and measurement class driver	2008-10-17 14:40:51 -07:00
dontdiff	dontdiff: more updates to be closer to gitignore	2008-10-16 11:21:31 -07:00
edac.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
eisa.txt	Fix typos in /Documentation : 'U-Z'	2006-11-30 04:58:40 +01:00
email-clients.txt	Documentation/email-clients.txt: add some info about gmail	2008-11-06 15:41:19 -08:00
exception.txt	Documentation: remove duplicated words	2006-10-03 22:57:56 +02:00
feature-removal-schedule.txt	hwmon: Deprecate the fscher and fscpos drivers	2009-01-07 16:37:33 +01:00
ftrace.txt	ftrace: improve documentation	2008-11-28 13:15:14 +01:00
gpio.txt	gpiolib: request/free hooks	2008-10-16 11:21:40 -07:00
highuid.txt	[SPARC]: Remove SunOS and Solaris binary support.	2008-04-21 15:10:15 -07:00
hw_random.txt	hw_random doc updates	2008-03-24 19:22:19 -07:00
ics932s401	ics932s401: new clock generator chip driver	2008-11-12 17:17:18 -08:00
initrd.txt	use the newc archive format as requested by initramfs	2008-02-03 14:54:41 +02:00
io-mapping.txt	io mapping: improve documentation	2008-11-03 18:21:44 +01:00
io_ordering.txt	…
iostats.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
irqflags-tracing.txt	[PATCH] lockdep: irqtrace subsystem, docs	2006-07-03 15:27:03 -07:00
isapnp.txt	…
java.txt	Documentation/java.txt: typo and grammar fixes	2007-10-20 02:37:21 +02:00
kernel-doc-nano-HOWTO.txt	documentation: how to use DOC: section blocks	2009-01-06 15:59:28 -08:00
kernel-docs.txt	doc: update to URL and status of kernel-docs.txt entry	2008-06-06 11:29:10 -07:00
kernel-parameters.txt	Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6	2009-01-07 15:41:01 -08:00
keys-request-key.txt	keys: allow the callout data to be passed as a blob rather than a string	2008-04-29 08:06:16 -07:00
keys.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
kobject.txt	kobject: Make Documentation/kobject.txt a little more coherent.	2009-01-06 10:44:32 -08:00
kprobes.txt	kprobes: support probing module __exit function	2009-01-06 15:59:21 -08:00
kref.txt	docs: convert kref semaphore to mutex	2008-02-06 10:41:09 -08:00
ldm.txt	LDM: Fix for Windows Vista dynamic disks	2007-05-21 09:58:40 -07:00
leds-class.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
local_ops.txt	documentation: local_ops fix on_each_cpu	2008-12-01 13:51:26 +01:00
lockdep-design.txt	[PATCH] fix lockdep-design.txt	2006-10-11 11:14:24 -07:00
lockstat.txt	lockstat: contend with points	2008-10-20 15:43:10 +02:00
logo.gif	…
logo.txt	…
magic-number.txt	documentation: update header file paths	2009-01-06 15:59:28 -08:00
markers.txt	markers: comment marker_synchronize_unregister() on data dependency	2008-11-28 16:47:41 +01:00
mca.txt	The ps2esdi driver was marked as BROKEN more than two years ago due to being	2008-03-17 09:03:05 +01:00
md.txt	md: Tidy up rdev_size_store a bit:	2008-07-21 14:22:18 +10:00
memory-barriers.txt	read_barrier_depends arch fixlets	2008-05-14 10:05:18 -07:00
memory-hotplug.txt	mm: show node to memory section relationship with symlinks in sysfs	2009-01-06 15:59:00 -08:00
memory.txt	…
mono.txt	Fix "can not" in Documentation and Kconfig	2006-10-03 22:53:09 +02:00
mutex-design.txt	Documentation: Add nested versions of mutex locks to docs	2007-10-20 00:15:26 +02:00
nmi_watchdog.txt	x86, nmi-watchdog: update procfs nmi_watchdog file documentation v2	2008-10-30 19:07:04 +01:00
nommu-mmap.txt	NOMMU: Make VMAs per MM as for MMU-mode linux	2009-01-08 12:04:47 +00:00
numastat.txt	…
oops-tracing.txt	Taint kernel after WARN_ON(condition)	2008-04-29 08:05:59 -07:00
parport-lowlevel.txt	plip: fix parport_register_device name parameter	2007-11-26 19:39:01 -08:00
parport.txt	…
pi-futex.txt	fix a typo in Documentation/pi-futex.txt	2006-10-03 23:39:02 +02:00
pnp.txt	Documentation: Replace obsolete "driverfs" with "sysfs".	2008-01-24 20:40:04 -08:00
preempt-locking.txt	…
printk-formats.txt	DOC: add printk-formats.txt	2008-11-12 17:17:17 -08:00
prio_tree.txt	Documentation: remove duplicated words	2006-10-03 22:57:56 +02:00
rbtree.txt	[PATCH] Documentation/rbtree.txt	2007-02-11 10:51:35 -08:00
rfkill.txt	rfkill: add master_switch_mode and EPO lock to rfkill and rfkill-input	2008-10-31 19:00:09 -04:00
robust-futex-ABI.txt	Fix typos in /Documentation : 'U-Z'	2006-11-30 04:58:40 +01:00
robust-futexes.txt	Fix typos in /Documentation : Misc	2006-11-30 05:21:10 +01:00
rt-mutex-design.txt	[PATCH] typo fixes for rt-mutex-design.txt	2006-10-01 00:39:24 -07:00
rt-mutex.txt	[PATCH] pi-futex: rt mutex docs	2006-06-27 17:32:47 -07:00
rtc.txt	rtc: cleanup example code	2008-02-06 10:41:14 -08:00
serial-console.txt	[PATCH] doc: more serial-console info	2006-03-25 08:23:00 -08:00
sgi-ioc4.txt	…
sgi-visws.txt	…
sparse.txt	kbuild: sparse needs CF not CHECKFLAGS	2008-07-25 22:12:39 +02:00
spinlocks.txt	Add additional examples in Documentation/spinlocks.txt	2008-04-11 13:21:14 -06:00
stable_api_nonsense.txt	stable_api_nonsense.txt: Disambiguate the use of "this" by using "that" to refer to the syscall interface	2007-07-30 14:25:12 -07:00
stable_kernel_rules.txt	Update stable tree documentation	2008-10-29 15:03:49 -07:00
svga.txt	…
sysfs-rules.txt	sysfs-rules.txt: reword API stability statement	2008-07-21 21:54:59 -07:00
sysrq.txt	Merge branch 'v28-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2008-10-20 13:19:56 -07:00
tracepoints.txt	tracepoints: Documentation TPPROTO misspelt in Documentation/tracepoints.txt	2008-11-29 15:13:42 +01:00
unaligned-memory-access.txt	introduce HAVE_EFFICIENT_UNALIGNED_ACCESS Kconfig symbol	2008-07-25 10:53:27 -07:00
unicode.txt	…
unshare.txt	Documentation: remove duplicated words	2006-10-03 22:57:56 +02:00
video-output.txt	output: Add output class document	2006-12-20 01:46:58 -05:00
volatile-considered-harmful.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
voyager.txt	…
zorro.txt	…