Document the Atom series D2000 and N2000 (Cedar Trail) as being supported.
List and set TjMax for those series.
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: "R, Durgadoss" <durgadoss.r@intel.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Document the new Atom series (Tunnel Creek and Medfield) as being
supported, and list TjMax for the Atom E600 series.
Also enable the Atom tjmax heuristic for these Atom CPU models.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Reviewed-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Alexander Stein <alexander.stein@systec-electronic.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: "R, Durgadoss" <durgadoss.r@intel.com>
Pull networking fixes from David S. Miller:
This has the fix for the wireless issues I ran into the other week as
well as:
1) Fix CAN c_can driver transmit handling resulting in BUG check
triggers, from AnilKumar Ch.
2) Fix packet drop monitor sleeping in atomic context, from Eric
Dumazet.
3) Fix mv643xx_eth driver build regression, from Andrew Lunn.
4) Inetpeer freeing needs an RCU grace period in order to avoid races
during tree invalidation. From Eric Dumazet.
5) Fix endianness bugs in xt_HMARK netfilter module, from Hans
Schillstrom.
6) Add proper module refcounting to l2tp_eth to avoid crash on module
unload, from Eric Dumazet.
7) Fix truncation of neighbour entry dumps due to logic errors in
neigh_dump_info() and friends, from Eric Dumazet.
8) The conversion of fib6_age() to dst_neigh_lookup() accidently
reversed the logic of a flags test, fix from Thomas Graf.
9) Fix checksum configuration in newer sky2 chips, from Stephen
Hemminger.
10) Revert BQL support in NIU driver, doesn't work.
11) l2tp_ip_sendmsg() illegally uses a route without a proper reference.
From Eric Dumazet.
12) be2net driver references an SKB after it's potentially been freed,
also from Eric Dumazet.
13) Fix RCU stalls in dummy net driver init. Also from Eric Dumazet.
14) lpc_eth has several bugs in it's transmit engine leading to packet
leaks and improper queue wakes, from Eric Dumazet.
15) Apply short DMA workaround to more tg3 chips, from Matt Carlson.
16) Add tilegx network driver.
17) Bonding queue mapping for a packet can get corrupted, fix from Eric
Dumazet.
18) Fix bug in netpoll_send_udp() SKB management that can leave garbage
in the payload in certain situations. From Eric Dumazet.
19) bnx2x driver interprets chip RX checksum offload incorrectly in
encapsulation situations. Fix from Eric Dumazet.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (75 commits)
bnx2x: fix checksum validation
netpoll: fix netpoll_send_udp() bugs
bonding: Fix corrupted queue_mapping
bonding:record primary when modify it via sysfs
tilegx network driver: initial support
tg3: Apply short DMA frag workaround to 5906
net: stmmac: Fix clock en-/disable calls
lpc_eth: fix tx completion
lpc_eth: add missing ndo_change_mtu()
dummy: fix rcu_sched self-detected stalls
net: Reorder initialization in ip_route_output to fix gcc warning
virtio-net: fix a race on 32bit arches
r8169: avoid NAPI scheduling delay.
net: Make linux/tcp.h C++ friendly (trivial)
netdev: fix drivers/net/phy/ kernel-doc warnings
net/core: fix kernel-doc warnings
be2net: fix a race in be_xmit()
l2tp: fix a race in l2tp_ip_sendmsg()
mac80211: add back channel change flag
NFC: Fix possible NULL ptr deref when getting the name of a socket
...
Fixed the driver's documentation that was obsolete and didn't
report new platform fields (recently added).
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Pull embedded i2c update from Wolfram Sang:
"This only contains one new driver which had multiple dependencies
(pinctrl, i2c-mux-rework, new devm_* functions), so I decided to wait
for rc1. Plus, it had to wait a little for the ack of a devicetree
maintainer since the bindings were not trivial enough for me to pass
through.
So, given that, I hope there is still something like the "new driver
rule", so we could have the driver in 3.5 and people can start using
it. That would make merging support for some boards easier for 3.6
since the dependency on this driver is gone then."
* 'i2c-embedded/for-current' of git://git.pengutronix.de/git/wsa/linux:
i2c: Add generic I2C multiplexer using pinctrl API
In some environments, dramatic performance savings may be obtained because
swapped pages are saved in RAM (or a RAM-like device) instead of a swap disk.
This tag provides the basic infrastructure along with some changes to the
existing backends.
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Merge tag 'stable/frontswap.v16-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/mm
Pull frontswap feature from Konrad Rzeszutek Wilk:
"Frontswap provides a "transcendent memory" interface for swap pages.
In some environments, dramatic performance savings may be obtained
because swapped pages are saved in RAM (or a RAM-like device) instead
of a swap disk. This tag provides the basic infrastructure along with
some changes to the existing backends."
Fix up trivial conflict in mm/Makefile due to removal of swap token code
changing a line next to the new frontswap entry.
This pull request came in before the merge window even opened, it got
delayed to after the merge window by me just wanting to make sure it had
actual users. Apparently IBM is using this on their embedded side, and
Jan Beulich says that it's already made available for SLES and OpenSUSE
users.
Also acked by Rik van Riel, and Konrad points to other people liking it
too. So in it goes.
By Dan Magenheimer (4) and Konrad Rzeszutek Wilk (2)
via Konrad Rzeszutek Wilk
* tag 'stable/frontswap.v16-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/mm:
frontswap: s/put_page/store/g s/get_page/load
MAINTAINER: Add myself for the frontswap API
mm: frontswap: config and doc files
mm: frontswap: core frontswap functionality
mm: frontswap: core swap subsystem hooks and headers
mm: frontswap: add frontswap header file
Pull timer updates from Thomas Gleixner:
"The clocksource driver is pure hardware enablement and the skew option
is default off, well tested and non dangerous."
* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
tick: Move skew_tick option into the HIGH_RES_TIMER section
clocksource: em_sti: Add DT support
clocksource: em_sti: Emma Mobile STI driver
clockevents: Make clockevents_config() a global symbol
tick: Add tick skew boot option
This is useful for SoCs whose I2C module's signals can be routed to
different sets of pins at run-time, using the pinctrl API.
+-----+ +-----+
| dev | | dev |
+------------------------+ +-----+ +-----+
| SoC | | |
| /----|------+--------+
| +---+ +------+ | child bus A, on first set of pins
| |I2C|---|Pinmux| |
| +---+ +------+ | child bus B, on second set of pins
| \----|------+--------+--------+
| | | | |
+------------------------+ +-----+ +-----+ +-----+
| dev | | dev | | dev |
+-----+ +-----+ +-----+
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
and provide a simple reserve/release mechanism for userspace tools to
access thin provisioning metadata while the pool is in use.
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Merge tag 'dm-3.5-changes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm
Pull device-mapper updates from Alasdair G Kergon:
"Improve multipath's retrying mechanism in some defined circumstances
and provide a simple reserve/release mechanism for userspace tools to
access thin provisioning metadata while the pool is in use."
* tag 'dm-3.5-changes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm:
dm thin: provide userspace access to pool metadata
dm thin: use slab mempools
dm mpath: allow ioctls to trigger pg init
dm mpath: delay retry of bypassed pg
dm mpath: reduce size of struct multipath
This patch implements two new messages that can be sent to the thin
pool target allowing it to take a snapshot of the _metadata_. This,
read-only snapshot can be accessed by userland, concurrently with the
live target.
Only one metadata snapshot can be held at a time. The pool's status
line will give the block location for the current msnap.
Since version 0.1.5 of the userland thin provisioning tools, the
thin_dump program displays the msnap as follows:
thin_dump -m <msnap root> <metadata dev>
Available here: https://github.com/jthornber/thin-provisioning-tools
Now that userland can access the metadata we can do various things
that have traditionally been kernel side tasks:
i) Incremental backups.
By using metadata snapshots we can work out what blocks have
changed over time. Combined with data snapshots we can ensure
the data doesn't change while we back it up.
A short proof of concept script can be found here:
https://github.com/jthornber/thinp-test-suite/blob/master/incremental_backup_example.rb
ii) Migration of thin devices from one pool to another.
iii) Merging snapshots back into an external origin.
iv) Asyncronous replication.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Pull straggler x86 fixes from Peter Anvin:
"Three groups of patches:
- EFI boot stub documentation and the ability to print error messages;
- Removal for PTRACE_ARCH_PRCTL for x32 (obsolete interface which
should never have been ported, and the port is broken and
potentially dangerous.)
- ftrace stack corruption fixes. I'm not super-happy about the
technical implementation, but it is probably the least invasive in
the short term. In the future I would like a single method for
nesting the debug stack, however."
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86, x32, ptrace: Remove PTRACE_ARCH_PRCTL for x32
x86, efi: Add EFI boot stub documentation
x86, efi; Add EFI boot stub console support
x86, efi: Only close open files in error path
ftrace/x86: Do not change stacks in DEBUG when calling lockdep
x86: Allow nesting of the debug stack IDT setting
x86: Reset the debug_stack update counter
ftrace: Use breakpoint method to update ftrace caller
ftrace: Synchronize variable setting with breakpoints
It includes:
- driver for AUO-K1900 and AUO-K1901 epaper controller
- large updates for OMAP (e.g. decouple HDMI audio and video)
- some updates for Exynos and SH Mobile
- various other small fixes and cleanups
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Merge tag 'fbdev-updates-for-3.5' of git://github.com/schandinat/linux-2.6
Pull fbdev updates from Florian Tobias Schandinat:
- driver for AUO-K1900 and AUO-K1901 epaper controller
- large updates for OMAP (e.g. decouple HDMI audio and video)
- some updates for Exynos and SH Mobile
- various other small fixes and cleanups
* tag 'fbdev-updates-for-3.5' of git://github.com/schandinat/linux-2.6: (130 commits)
video: bfin_adv7393fb: Fix cleanup code
video: exynos_dp: reduce delay time when configuring video setting
video: exynos_dp: move sw reset prioir to enabling sw defined function
video: exynos_dp: use devm_ functions
fb: handle NULL pointers in framebuffer release
OMAPDSS: HDMI: OMAP4: Update IRQ flags for the HPD IRQ request
OMAPDSS: Apply VENC timings even if panel is disabled
OMAPDSS: VENC/DISPC: Delay dividing Y resolution for managers connected to VENC
OMAPDSS: DISPC: Support rotation through TILER
OMAPDSS: VRFB: remove compiler warnings when CONFIG_BUG=n
OMAPFB: remove compiler warnings when CONFIG_BUG=n
OMAPDSS: remove compiler warnings when CONFIG_BUG=n
OMAPDSS: DISPC: fix usage of dispc_ovl_set_accu_uv
OMAPDSS: use DSI_FIFO_BUG workaround only for manual update displays
OMAPDSS: DSI: Support command mode interleaving during video mode blanking periods
OMAPDSS: DISPC: Update Accumulator configuration for chroma plane
drivers/video: fsl-diu-fb: don't initialize the THRESHOLDS registers
video: exynos mipi dsi: support reverse panel type
video: exynos mipi dsi: Properly interpret the interrupt source flags
video: exynos mipi dsi: Avoid races in probe()
...
- Updates to mxc_nand and gpmi drivers to support new boards and device tree
- Improve consistency of information about ECC strength in NAND devices
- Clean up partition handling of plat_nand
- Support NAND drivers without dedicated access to OOB area
- BCH hardware ECC support for OMAP
- Other fixes and cleanups, and a few new device IDs
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Merge tag 'for-linus-3.5-20120601' of git://git.infradead.org/linux-mtd
Pull mtd update from David Woodhouse:
- More robust parsing especially of xattr data in JFFS2
- Updates to mxc_nand and gpmi drivers to support new boards and device tree
- Improve consistency of information about ECC strength in NAND devices
- Clean up partition handling of plat_nand
- Support NAND drivers without dedicated access to OOB area
- BCH hardware ECC support for OMAP
- Other fixes and cleanups, and a few new device IDs
Fixed trivial conflict in drivers/mtd/nand/gpmi-nand/gpmi-nand.c due to
added include files next to each other.
* tag 'for-linus-3.5-20120601' of git://git.infradead.org/linux-mtd: (75 commits)
mtd: mxc_nand: move ecc strengh setup before nand_scan_tail
mtd: block2mtd: fix recursive call of mtd_writev
mtd: gpmi-nand: define ecc.strength
mtd: of_parts: fix breakage in Kconfig
mtd: nand: fix scan_read_raw_oob
mtd: docg3 fix in-middle of blocks reads
mtd: cfi_cmdset_0002: Slight cleanup of fixup messages
mtd: add fixup for S29NS512P NOR flash.
jffs2: allow to complete xattr integrity check on first GC scan
jffs2: allow to discriminate between recoverable and non-recoverable errors
mtd: nand: omap: add support for hardware BCH ecc
ARM: OMAP3: gpmc: add BCH ecc api and modes
mtd: nand: check the return code of 'read_oob/read_oob_raw'
mtd: nand: remove 'sndcmd' parameter of 'read_oob/read_oob_raw'
mtd: m25p80: Add support for Winbond W25Q80BW
jffs2: get rid of jffs2_sync_super
jffs2: remove unnecessary GC pass on sync
jffs2: remove unnecessary GC pass on umount
jffs2: remove lock_super
mtd: gpmi: add gpmi support for mx6q
...
Pull slab updates from Pekka Enberg:
"Mainly a bunch of SLUB fixes from Joonsoo Kim"
* 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux:
slub: use __SetPageSlab function to set PG_slab flag
slub: fix a memory leak in get_partial_node()
slub: remove unused argument of init_kmem_cache_node()
slub: fix a possible memory leak
Documentations: Fix slabinfo.c directory in vm/slub.txt
slub: fix incorrect return type of get_any_partial()
Pull vfs changes from Al Viro.
"A lot of misc stuff. The obvious groups:
* Miklos' atomic_open series; kills the damn abuse of
->d_revalidate() by NFS, which was the major stumbling block for
all work in that area.
* ripping security_file_mmap() and dealing with deadlocks in the
area; sanitizing the neighborhood of vm_mmap()/vm_munmap() in
general.
* ->encode_fh() switched to saner API; insane fake dentry in
mm/cleancache.c gone.
* assorted annotations in fs (endianness, __user)
* parts of Artem's ->s_dirty work (jff2 and reiserfs parts)
* ->update_time() work from Josef.
* other bits and pieces all over the place.
Normally it would've been in two or three pull requests, but
signal.git stuff had eaten a lot of time during this cycle ;-/"
Fix up trivial conflicts in Documentation/filesystems/vfs.txt (the
'truncate_range' inode method was removed by the VM changes, the VFS
update adds an 'update_time()' method), and in fs/btrfs/ulist.[ch] (due
to sparse fix added twice, with other changes nearby).
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (95 commits)
nfs: don't open in ->d_revalidate
vfs: retry last component if opening stale dentry
vfs: nameidata_to_filp(): don't throw away file on error
vfs: nameidata_to_filp(): inline __dentry_open()
vfs: do_dentry_open(): don't put filp
vfs: split __dentry_open()
vfs: do_last() common post lookup
vfs: do_last(): add audit_inode before open
vfs: do_last(): only return EISDIR for O_CREAT
vfs: do_last(): check LOOKUP_DIRECTORY
vfs: do_last(): make ENOENT exit RCU safe
vfs: make follow_link check RCU safe
vfs: do_last(): use inode variable
vfs: do_last(): inline walk_component()
vfs: do_last(): make exit RCU safe
vfs: split do_lookup()
Btrfs: move over to use ->update_time
fs: introduce inode operation ->update_time
reiserfs: get rid of resierfs_sync_super
reiserfs: mark the superblock as dirty a bit later
...
Since we can't expect every user to read the EFI boot stub code it
seems prudent to have a couple of paragraphs explaining what it is and
how it works.
The "initrd=" option in particular is tricky because it only
understands absolute EFI-style paths (backslashes as directory
separators), and until now this hasn't been documented anywhere. This
has tripped up a couple of users.
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Link: http://lkml.kernel.org/r/1331907517-3985-4-git-send-email-matt@console-pimps.org
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Btrfs has to make sure we have space to allocate new blocks in order to modify
the inode, so updating time can fail. We've gotten around this by having our
own file_update_time but this is kind of a pain, and Christoph has indicated he
would like to make xfs do something different with atime updates. So introduce
->update_time, where we will deal with i_version an a/m/c time updates and
indicate which changes need to be made. The normal version just does what it
has always done, updates the time and marks the inode dirty, and then
filesystems can choose to do something different.
I've gone through all of the users of file_update_time and made them check for
errors with the exception of the fault code since it's complicated and I wasn't
quite sure what to do there, also Jan is going to be pushing the file time
updates into page_mkwrite for those who have it so that should satisfy btrfs and
make it not a big deal to check the file_update_time() return code in the
generic fault path. Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
Merge misc patches from Andrew Morton:
- the "misc" tree - stuff from all over the map
- checkpatch updates
- fatfs
- kmod changes
- procfs
- cpumask
- UML
- kexec
- mqueue
- rapidio
- pidns
- some checkpoint-restore feature work. Reluctantly. Most of it
delayed a release. I'm still rather worried that we don't have a
clear roadmap to completion for this work.
* emailed from Andrew Morton <akpm@linux-foundation.org>: (78 patches)
kconfig: update compression algorithm info
c/r: prctl: add ability to set new mm_struct::exe_file
c/r: prctl: extend PR_SET_MM to set up more mm_struct entries
c/r: procfs: add arg_start/end, env_start/end and exit_code members to /proc/$pid/stat
syscalls, x86: add __NR_kcmp syscall
fs, proc: introduce /proc/<pid>/task/<tid>/children entry
sysctl: make kernel.ns_last_pid control dependent on CHECKPOINT_RESTORE
aio/vfs: cleanup of rw_copy_check_uvector() and compat_rw_copy_check_uvector()
eventfd: change int to __u64 in eventfd_signal()
fs/nls: add Apple NLS
pidns: make killed children autoreap
pidns: use task_active_pid_ns in do_notify_parent
rapidio/tsi721: add DMA engine support
rapidio: add DMA engine support for RIO data transfers
ipc/mqueue: add rbtree node caching support
tools/selftests: add mq_perf_tests
ipc/mqueue: strengthen checks on mqueue creation
ipc/mqueue: correct mq_attr_ok test
ipc/mqueue: improve performance of send/recv
selftests: add mq_open_tests
...
We would like to have an ability to restore command line arguments and
program environment pointers but first we need to obtain them somehow.
Thus we put these values into /proc/$pid/stat. The exit_code is needed to
restore zombie tasks.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andrew Vagin <avagin@openvz.org>
Cc: Vasiliy Kulikov <segoon@openwall.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
When we do checkpoint of a task we need to know the list of children the
task, has but there is no easy and fast way to generate reverse
parent->children chain from arbitrary <pid> (while a parent pid is
provided in "PPid" field of /proc/<pid>/status).
So instead of walking over all pids in the system (creating one big
process tree in memory, just to figure out which children a task has) --
we add explicit /proc/<pid>/task/<tid>/children entry, because the kernel
already has this kind of information but it is not yet exported.
This is a first level children, not the whole process tree.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commit b231cca438 ("message queues: increase range limits") changed
mqueue default value when attr parameter is specified NULL from hard
coded value to fs.mqueue.{msg,msgsize}_max sysctl value.
This made large side effect. When user need to use two mqueue
applications 1) using !NULL attr parameter and it require big message
size and 2) using NULL attr parameter and only need small size message,
app (1) require to raise fs.mqueue.msgsize_max and app (2) consume large
memory size even though it doesn't need.
Doug Ledford propsed to switch back it to static hard coded value.
However it also has a compatibility problem. Some applications might
started depend on the default value is tunable.
The solution is to separate default value from maximum value.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Acked-by: Doug Ledford <dledford@redhat.com>
Acked-by: Joe Korty <joe.korty@ccur.com>
Cc: Amerigo Wang <amwang@redhat.com>
Acked-by: Serge E. Hallyn <serue@us.ibm.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This is an implementation of Andrew's proposal to extend the pagemap file
bits to report what is missing about tasks' working set.
The problem with the working set detection is multilateral. In the criu
(checkpoint/restore) project we dump the tasks' memory into image files
and to do it properly we need to detect which pages inside mappings are
really in use. The mincore syscall I though could help with this did not.
First, it doesn't report swapped pages, thus we cannot find out which
parts of anonymous mappings to dump. Next, it does report pages from page
cache as present even if they are not mapped, and it doesn't make that has
not been cow-ed.
Note, that issue with swap pages is critical -- we must dump swap pages to
image file. But the issues with file pages are optimization -- we can
take all file pages to image, this would be correct, but if we know that a
page is not mapped or not cow-ed, we can remove them from dump file. The
dump would still be self-consistent, though significantly smaller in size
(up to 10 times smaller on real apps).
Andrew noticed, that the proc pagemap file solved 2 of 3 above issues --
it reports whether a page is present or swapped and it doesn't report not
mapped page cache pages. But, it doesn't distinguish cow-ed file pages
from not cow-ed.
I would like to make the last unused bit in this file to report whether the
page mapped into respective pte is PageAnon or not.
[comment stolen from Pavel Emelyanov's v1 patch]
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@redhat.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>
Add the new kmalloc_array() to the list of general-purpose memory
allocators in chapter 14.
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Acked-by: Jesper Juhl <jj@chaosbits.net>
Acked-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Merge tag 'for-v3.5' of git://git.infradead.org/battery-2.6
Pull battery updates from Anton Vorontsov:
"A bunch of fixes for v3.5, nothing extraordinary."
* tag 'for-v3.5' of git://git.infradead.org/battery-2.6: (27 commits)
smb347-charger: Include missing <linux/err.h>
smb347-charger: Clean up battery attributes
max17042_battery: Add support for max17047/50 chip
sbs-battery.c: Capacity attr = remaining relative capacity
isp1704_charger: Use after free on probe error
ds2781_battery: Use DS2781_PARAM_EEPROM_SIZE and DS2781_USER_EEPROM_SIZE
power_supply: Fix a typo in BATTERY_DS2781 Kconfig entry
charger-manager: Provide cm_notify_event function for in-kernel use
charger-manager: Poll battery health in normal state
smb347-charger: Convert to regmap API
smb347-charger: Move IRQ enabling to the end of probe
smb347-charger: Rename few functions to match better what they are doing
smb347-charger: Convert to use module_i2c_driver()
smb347_charger: Cleanup power supply registration code in probe
ab8500: Clean up probe routines
ab8500_fg: Harden platform data check
ab8500_btemp: Harden platform data check
ab8500_charger: Harden platform data check
MAINTAINERS: Fix 'F' entry for the power supply class
max17042_battery: Handle irq request failure case
...
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Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull final round of SCSI updates from James Bottomley:
"This is primarily another round of driver updates (bnx2fc, qla2xxx,
qla4xxx) including the target mode driver for qla2xxx. We've also got
a couple of regression fixes (async scanning, broken this merge window
and a fix to a long standing break in the scsi_wait_scan module)."
* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (45 commits)
[SCSI] fix scsi_wait_scan
[SCSI] fix async probe regression
[SCSI] be2iscsi: fix dma free size mismatch regression
[SCSI] qla4xxx: Update driver version to 5.02.00-k17
[SCSI] qla4xxx: Capture minidump for ISP82XX on firmware failure
[SCSI] qla4xxx: Add change_queue_depth API support
[SCSI] qla4xxx: Fix clear ddb mbx command failure issue.
[SCSI] qla4xxx: Fix kernel panic during discovery logout.
[SCSI] qla4xxx: Correct early completion of pending mbox.
[SCSI] fcoe, bnx2fc, libfcoe: SW FCoE and bnx2fc use FCoE Syfs
[SCSI] libfcoe: Add fcoe_sysfs
[SCSI] bnx2fc: Allocate fcoe_ctlr with bnx2fc_interface, not as a member
[SCSI] fcoe: Allocate fcoe_ctlr with fcoe_interface, not as a member
[SCSI] Fix dm-multipath starvation when scsi host is busy
[SCSI] ufs: fix potential NULL pointer dereferencing error in ufshcd_prove.
[SCSI] qla2xxx: don't free pool that wasn't allocated
[SCSI] mptfusion: unlock on error in mpt_config()
[SCSI] tcm_qla2xxx: Add >= 24xx series fabric module for target-core
[SCSI] qla2xxx: Add LLD target-mode infrastructure for >= 24xx series
[SCSI] Revert "qla2xxx: During loopdown perform Diagnostic loopback."
...
Pull follow-up block updates from Jens Axboe:
"Includes the fix from Eric to resolve the infinite loop in looking up
or creating an IO context for an exiting task.
Also a bunch of mtip32xx patches. Fairly trivial stuff. It's fairly
new though, but no point in keeping it out of the tree until 3.6 imho.
I've thrown it through basic testing locally as well, works fine. The
one contentious part is the patch that Greg complained about (sysfs
file with multiple values, should be a debugfs file), which is
perfectly valid, but not a regression from what the file contains now.
That will be fixed up separately."
* 'for-linus' of git://git.kernel.dk/linux-block:
block: avoid infinite loop in get_task_io_context()
mtip32xx: Changes to sysfs entries
mtip32xx: Convert macro definitions for flag bits to enum
mtip32xx: minor performance tweak
mtip32xx: Fix to support more than one sector in exec_drive_command()
mtip32xx: Use plain spinlock for 'cmd_issue_lock'
mtip32xx: Set block queue boundary variables
mtip32xx: Fix to handle TFE for PIO(IOCTL/internal) commands
mtip32xx: Change HDIO_GET_IDENTITY to return stored data
mtip32xx: Set custom timeouts for PIO commands
mtip32xx: fix clearing an incorrect register in mtip_init_port
Pull networking changes from David S. Miller:
1) Fix IPSEC header length calculation for transport mode in ESP. The
issue is whether to do the calculation before or after alignment.
Fix from Benjamin Poirier.
2) Fix regression in IPV6 IPSEC fragment length calculations, from Gao
Feng. This is another transport vs tunnel mode issue.
3) Handle AF_UNSPEC connect()s properly in L2TP to avoid OOPSes. Fix
from James Chapman.
4) Fix USB ASIX driver's reception of full sized VLAN packets, from
Eric Dumazet.
5) Allow drop monitor (and, more generically, all generic netlink
protocols) to be automatically loaded as a module. From Neil
Horman.
Fix up trivial conflict in Documentation/feature-removal-schedule.txt
due to new entries added next to each other at the end. As usual.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (38 commits)
net/smsc911x: Repair broken failure paths
virtio-net: remove useless disable on freeze
netdevice: Update netif_dbg for CONFIG_DYNAMIC_DEBUG
drop_monitor: Add module alias to enable automatic module loading
genetlink: Build a generic netlink family module alias
net: add MODULE_ALIAS_NET_PF_PROTO_NAME
r6040: Do a Proper deinit at errorpath and also when driver unloads (calling r6040_remove_one)
r6040: disable pci device if the subsequent calls (after pci_enable_device) fails
skb: avoid unnecessary reallocations in __skb_cow
net: sh_eth: fix the rxdesc pointer when rx descriptor empty happens
asix: allow full size 8021Q frames to be received
rds_rdma: don't assume infiniband device is PCI
l2tp: fix oops in L2TP IP sockets for connect() AF_UNSPEC case
mac80211: fix ADDBA declined after suspend with wowlan
wlcore: fix undefined symbols when CONFIG_PM is not defined
mac80211: fix flag check for QoS NOACK frames
ath9k_hw: apply internal regulator settings on AR933x
ath9k_hw: update AR933x initvals to fix issues with high power devices
ath9k: fix a use-after-free-bug when ath_tx_setup_buffer() fails
ath9k: stop rx dma before stopping tx
...
* Formatted the output of 'registers' entry
* Added "Commands in Q' to output of 'registers' entry
* Added a new entry 'flags'
Signed-off-by: Asai Thambi S P <asamymuthupa@micron.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Pull ceph updates from Sage Weil:
"There are some updates and cleanups to the CRUSH placement code, a bug
fix with incremental maps, several cleanups and fixes from Josh Durgin
in the RBD block device code, a series of cleanups and bug fixes from
Alex Elder in the messenger code, and some miscellaneous bounds
checking and gfp cleanups/fixes."
Fix up trivial conflicts in net/ceph/{messenger.c,osdmap.c} due to the
networking people preferring "unsigned int" over just "unsigned".
* git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (45 commits)
libceph: fix pg_temp updates
libceph: avoid unregistering osd request when not registered
ceph: add auth buf in prepare_write_connect()
ceph: rename prepare_connect_authorizer()
ceph: return pointer from prepare_connect_authorizer()
ceph: use info returned by get_authorizer
ceph: have get_authorizer methods return pointers
ceph: ensure auth ops are defined before use
ceph: messenger: reduce args to create_authorizer
ceph: define ceph_auth_handshake type
ceph: messenger: check return from get_authorizer
ceph: messenger: rework prepare_connect_authorizer()
ceph: messenger: check prepare_write_connect() result
ceph: don't set WRITE_PENDING too early
ceph: drop msgr argument from prepare_write_connect()
ceph: messenger: send banner in process_connect()
ceph: messenger: reset connection kvec caller
libceph: don't reset kvec in prepare_write_banner()
ceph: ignore preferred_osd field
ceph: fully initialize new layout
...
Pull i2c updates from Jean Delvare.
* 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
i2c: Split I2C_M_NOSTART support out of I2C_FUNC_PROTOCOL_MANGLING
i2c-dev: Add support for I2C_M_RECV_LEN
Pull second set of watchdog updates from Wim Van Sebroeck:
"This changeset contains following changes:
* Add support for multiple watchdog devices. We use dynamically
allocated device id's for this.
* Add locking into the generic watchdog infrastructure.
* Add support for dynamically allocated watchdog_device structs so
that we can deal with devices that get unbound.
* convert following drivers to the generic watchdog framework:
sch5627, sch5636 and sp805_wdt.
* Add DA9052/53 PMIC watchdog support
* Fix printk format warnings for iTCO_wdt.c"
* git://www.linux-watchdog.org/linux-watchdog:
watchdog: iTCO_wdt.c: fix printk format warnings
watchdog: sp805_wdt: Add clk_{un}prepare support
watchdog: sp805_wdt: convert to watchdog core
hwmon/sch56xx: Depend on watchdog for watchdog core functions
watchdog: sch56xx-common: set correct bits in register()
Watchdog: DA9052/53 PMIC watchdog support
watchdog: sch56xx-common: Add proper ref-counting of watchdog data
watchdog: sch56xx: Remove unnecessary checks for register changes
watchdog: sch56xx: Use watchdog core
watchdog: Add support for dynamically allocated watchdog_device structs
watchdog: Add Locking support
watchdog: watchdog_dev: Rewrite wrapper code
watchdog: use dev_ functions
watchdog: create all the proper device files
watchdog: Add a flag to indicate the watchdog doesn't reboot things
watchdog: Add multiple device support
watchdog: watchdog_core.h: make functions extern
watchdog: correct the name of the watchdog_core inlude file
watchdog: Add watchdog_active() routine
watchdog: watchdog_dev: include private header to pickup global symbol prototypes
Not much stuff this time. The only change to the IOMMU core code is the
addition of a handle to the fault handling code. A few updates to the
AMD IOMMU driver to work around new errata. The other patches are mostly
fixes and enhancements to the existing ARM IOMMU drivers and
documentation updates.
A new IOMMU driver for the Exynos platform was also underway but got
merged via the Samsung tree and is not part of this tree.
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Merge tag 'iommu-updates-v3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
Pull IOMMU updates from Joerg Roedel:
"Not much stuff this time. The only change to the IOMMU core code is
the addition of a handle to the fault handling code. A few updates to
the AMD IOMMU driver to work around new errata. The other patches are
mostly fixes and enhancements to the existing ARM IOMMU drivers and
documentation updates.
A new IOMMU driver for the Exynos platform was also underway but got
merged via the Samsung tree and is not part of this tree."
* tag 'iommu-updates-v3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
Documentation: kernel-parameters.txt Add amd_iommu_dump
iommu/core: pass a user-provided token to fault handlers
iommu/tegra: gart: Fix register offset correctly
iommu: OMAP: device detach on domain destroy
iommu: tegra/gart: Add device tree support
iommu: tegra/gart: use correct gart_device
iommu/tegra: smmu: Print device name correctly
iommu/amd: Add workaround for event log erratum
iommu/amd: Check for the right TLP prefix bit
dma-debug: release free_entries_lock before saving stack trace
Since there are uses for I2C_M_NOSTART which are much more sensible and
standard than most of the protocol mangling functionality (the main one
being gather writes to devices where something like a register address
needs to be inserted before a block of data) create a new I2C_FUNC_NOSTART
for this feature and update all the users to use it.
Also strengthen the disrecommendation of the protocol mangling while we're
at it.
In the case of regmap-i2c we remove the requirement for mangling as
I2C_M_NOSTART is the only mangling feature which is being used.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This driver adds support for the watchdog functionality provided by
the Dialog Semiconductor DA9052 PMIC chip.
Tested on samsung smdkv6410 and i.mx53 QS boards.
Signed-off-by: Anthony Olech <Anthony.Olech@diasemi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
If a driver's watchdog_device struct is part of a dynamically allocated
struct (which it often will be), merely locking the module is not enough,
even with a drivers module locked, the driver can be unbound from the device,
examples:
1) The root user can unbind it through sysfd
2) The i2c bus master driver being unloaded for an i2c watchdog
I will gladly admit that these are corner cases, but we still need to handle
them correctly.
The fix for this consists of 2 parts:
1) Add ref / unref operations, so that the driver can refcount the struct
holding the watchdog_device struct and delay freeing it until any
open filehandles referring to it are closed
2) Most driver operations will do IO on the device and the driver should not
do any IO on the device after it has been unbound. Rather then letting each
driver deal with this internally, it is better to ensure at the watchdog
core level that no operations (other then unref) will get called after
the driver has called watchdog_unregister_device(). This actually is the
bulk of this patch.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This patch fixes some potential multithreading issues, despite only
allowing one process to open the /dev/watchdog device, we can still get
called multiple times at the same time, since a program could be using thread,
or could share the fd after a fork.
This causes 2 potential problems:
1) watchdog_start / open do an unlocked test_n_set / test_n_clear,
if these 2 race, the watchdog could be stopped while the active
bit indicates it is running or visa versa.
2) Most watchdog_dev drivers probably assume that only one
watchdog-op will get called at a time, this is not necessary
true atm.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Create the watchdog class and it's associated devices.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
We keep the old /dev/watchdog interface file for the first watchdog via
miscdev. This is basically a cut and paste of the relevant interface code
from the rtc driver layer tweaked for watchdog.
Revised to fix problems noted by Hans de Goede
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Pull MIPS updates from Ralf Baechle:
"The whole series has been sitting in -next for quite a while with no
complaints. The last change to the series was before the weekend the
removal of an SPI patch which Grant - even though previously acked by
himself - appeared to raise objections. So I removed it until the
situation is clarified. Other than that all the patches have the acks
from their respective maintainers, all MIPS and x86 defconfigs are
building fine and I'm not aware of any problems introduced by this
series.
Among the key features for this patch series is a sizable patchset for
Lantiq which among other things introduces support for Lantiq's
flagship product, the FALCON SOC. It also means that the opensource
developers behind this patchset have overtaken Lantiq's competing
inhouse development team that was working behind closed doors.
Less noteworthy the ath79 patchset which adds support for a few more
chip variants, cleanups and fixes. Finally the usual dose of tweaking
of generic code."
Fix up trivial conflicts in arch/mips/lantiq/xway/gpio_{ebu,stp}.c where
printk spelling fixes clashed with file move and eventual removal of the
printk.
* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (81 commits)
MIPS: lantiq: remove orphaned code
MIPS: Remove all -Wall and almost all -Werror usage from arch/mips.
MIPS: lantiq: implement support for FALCON soc
MTD: MIPS: lantiq: verify that the NOR interface is available on falcon soc
MTD: MIPS: lantiq: implement OF support
watchdog: MIPS: lantiq: implement OF support and minor fixes
SERIAL: MIPS: lantiq: implement OF support
GPIO: MIPS: lantiq: convert gpio-stp-xway to OF
GPIO: MIPS: lantiq: convert gpio-mm-lantiq to OF and of_mm_gpio
GPIO: MIPS: lantiq: move gpio-stp and gpio-ebu to the subsystem folder
MIPS: pci: convert lantiq driver to OF
MIPS: lantiq: convert dma to platform driver
MIPS: lantiq: implement support for clkdev api
MIPS: lantiq: drop ltq_gpio_request() and gpio_to_irq()
OF: MIPS: lantiq: implement irq_domain support
OF: MIPS: lantiq: implement OF support
MIPS: lantiq: drop mips_machine support
OF: PCI: const usage needed by MIPS
MIPS: Cavium: Remove smp_reserve_lock.
MIPS: Move cache setup to setup_arch().
...
Adds device tree support for rtc-lpc32xx.c
Signed-off-by: Roland Stigge <stigge@antcom.de>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
SPEAr platforms now support DT and so must convert all drivers support DT.
This patch adds DT probing support for rtc and updates its documentation
too.
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Rajeev Kumar <rajeev-dlh.kumar@st.com>
Cc: Rob Herring <robherring2@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Add sub-driver for the LEDs on National Semiconductor / TI LM3533 lighting
power chips.
The chip provides 256 brightness levels, hardware accelerated blinking as
well as ambient-light-sensor and pwm input control.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Rob Landley <rob@landley.net>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Bryan Wu <bryan.wu@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The leds timer trigger does not currently have an interface to activate a
one shot timer. The current support allows for setting two timers, one
for specifying how long a state to be on, and the second for how long the
state to be off. The delay_on value specifies the time period an LED
should stay in on state, followed by a delay_off value that specifies how
long the LED should stay in off state. The on and off cycle repeats until
the trigger gets deactivated. There is no provision for one time
activation to implement features that require an on or off state to be
held just once and then stay in the original state forever.
Without one shot timer interface, user space can still use timer trigger
to set a timer to hold a state, however when user space application
crashes or goes away without deactivating the timer, the hardware will be
left in that state permanently.
As a specific example of this use-case, let's look at vibrate feature on
phones. Vibrate function on phones is implemented using PWM pins on SoC
or PMIC. There is a need to activate one shot timer to control the
vibrate feature, to prevent user space crashes leaving the phone in
vibrate mode permanently causing the battery to drain.
This trigger exports three properties, activate, state, and duration When
transient trigger is activated these properties are set to default values.
- duration allows setting timer value in msecs. The initial value is 0.
- activate allows activating and deactivating the timer specified by
duration as needed. The initial and default value is 0. This will allow
duration to be set after trigger activation.
- state allows user to specify a transient state to be held for the specified
duration.
Signed-off-by: Shuah Khan <shuahkhan@gmail.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: NeilBrown <neilb@suse.de>
Cc: Bryan Wu <bryan.wu@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Add sub-driver for the backlights on National Semiconductor / TI LM3533
lighting power chips.
The chip provides 256 brightness levels and ambient-light-sensor and pwm
input control.
[akpm@linux-foundation.org: fix warning]
[akpm@linux-foundation.org: fix the type of `mode']
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Rob Landley <rob@landley.net>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Presently, at removal of cgroup, ->pre_destroy() is called and moves
charges to the parent cgroup. A major reason for returning -EBUSY from
->pre_destroy() is that the 'moving' hits the parent's resource
limitation. It happens only when use_hierarchy=0.
Considering use_hierarchy=0, all cgroups should be flat. So, no one
cannot justify moving charges to parent...parent and children are in flat
configuration, not hierarchical.
This patch modifes the code to move charges to the root cgroup at
rmdir/force_empty if use_hierarchy==0. This will much simplify rmdir()
and reduce error in ->pre_destroy.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ying Han <yinghan@google.com>
Cc: Glauber Costa <glommer@parallels.com>
Reviewed-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
When killing a res_counter which is a child of other counter, we need to
do
res_counter_uncharge(child, xxx)
res_counter_charge(parent, xxx)
This is not atomic and wastes CPU. This patch adds
res_counter_uncharge_until(). This function's uncharge propagates to
ancestors until specified res_counter.
res_counter_uncharge_until(child, parent, xxx)
Now the operation is atomic and efficient.
Signed-off-by: Frederic Weisbecker <fweisbec@redhat.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Ying Han <yinghan@google.com>
Cc: Glauber Costa <glommer@parallels.com>
Reviewed-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This patch changes memcg's behavior at task_move().
At task_move(), the kernel scans a task's page table and move the changes
for mapped pages from source cgroup to target cgroup. There has been a
bug at handling shared anonymous pages for a long time.
Before patch:
- The spec says 'shared anonymous pages are not moved.'
- The implementation was 'shared anonymoys pages may be moved'.
If page_mapcount <=2, shared anonymous pages's charge were moved.
After patch:
- The spec says 'all anonymous pages are moved'.
- The implementation is 'all anonymous pages are moved'.
Considering usage of memcg, this will not affect user's experience.
'shared anonymous' pages only exists between a tree of processes which
don't do exec(). Moving one of process without exec() seems not sane.
For example, libcgroup will not be affected by this change. (Anyway, no
one noticed the implementation for a long time...)
Below is a discussion log:
- current spec/implementation are complex
- Now, shared file caches are moved
- It adds unclear check as page_mapcount(). To do correct check,
we should check swap users, etc.
- No one notice this implementation behavior. So, no one get benefit
from the design.
- In general, once task is moved to a cgroup for running, it will not
be moved....
- Finally, we have control knob as memory.move_charge_at_immigrate.
Here is a patch to allow moving shared pages, completely. This makes
memcg simpler and fix current broken code.
Suggested-by: Hugh Dickins <hughd@google.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Glauber Costa <glommer@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
