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This is the same as bf72eda5 except that it's a different file. Sync
documentation with changes made by 730c9eec in 2009.
Link: http://lkml.kernel.org/r/148577165630.9801.6081791213151121657.stgit@pluto.themaw.net
Signed-off-by: Tomohiro Kusumi <tkusumi@tuxera.com>
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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This is the same as d8732841 except that it's a different file. A caller
has no devid input, and devid is obtained via superblock.
Link: http://lkml.kernel.org/r/148577165119.9801.16967562019122274820.stgit@pluto.themaw.net
Signed-off-by: Tomohiro Kusumi <tkusumi@tuxera.com>
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Link: http://lkml.kernel.org/r/148577164606.9801.12571810310561599401.stgit@pluto.themaw.net
Signed-off-by: Tomohiro Kusumi <tkusumi@tuxera.com>
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Adds perf events support for L2 cache PMU.
The L2 cache PMU driver is named 'l2cache_0' and can be used
with perf events to profile L2 events such as cache hits
and misses on Qualcomm Technologies processors.
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Neil Leeder <nleeder@codeaurora.org>
[will: minimise nesting in l2_cache_associate_cpu_with_cluster]
[will: use kstrtoul for unsigned long, remove redunant .owner setting]
Signed-off-by: Will Deacon <will.deacon@arm.com>
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'regulator/topic/pv88090', 'regulator/topic/qcom-smd', 'regulator/topic/rc5t583' and 'regulator/topic/rn5t618' into regulator-next
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'regulator/topic/fan53555', 'regulator/topic/gpio', 'regulator/topic/hi655x' and 'regulator/topic/lp8755' into regulator-next
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'asoc/topic/simple', 'asoc/topic/sunxi' and 'asoc/topic/tlv320aic3x' into asoc-next
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'asoc/topic/rockchip' and 'asoc/topic/rt5514' into asoc-next
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'asoc/topic/nau8540' and 'asoc/topic/omap' into asoc-next
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'asoc/topic/fsl' and 'asoc/topic/graph' into asoc-next
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'asoc/topic/cq93vc' and 'asoc/topic/da7218' into asoc-next
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LED Mode:
Microsemi PHY support 2 LEDs (LED[0] and LED[1]) to display different
status information that can be selected by setting LED mode.
LED Mode parameter (vsc8531, led-0-mode) and (vsc8531, led-1-mode) get
from Device Tree.
Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@microsemi.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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SSD1306 needs VBAT when it is wired in charge pump configuration. This
patch adds support to the driver to enable VBAT regulator at init time.
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Benoît Cousson <bcousson@baylibre.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
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Make reset gpio devicetree property optional. Depending on the board
designing there may not be a dedicated gpio for resetting the
display. Without a proper reset there may be some junk in the display
memory at probe time, so in such a case the display memory is cleared
before turning it on. The devicetree binding document is also updated.
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Benoît Cousson <bcousson@baylibre.com>
Signed-off-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
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Remove reset-active-low from the devicetree binding document. The actual
implementation has never been there in the driver code and there is no
reason to add it because the gpiod API supports gpio flags, including
GPIO_ACTIVE_LOW, directly trough its own devicetree binding.
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Benoît Cousson <bcousson@baylibre.com>
Signed-off-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
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* pm-devfreq:
PM / devfreq: Modify the device name as devfreq(X) for sysfs
PM / devfreq: Simplify the sysfs name of devfreq-event device
PM / devfreq: Remove unnecessary separate _remove_devfreq()
PM / devfreq: Fix wrong trans_stat of passive devfreq device
PM / devfreq: Fix available_governor sysfs
PM / devfreq: exynos-ppmu: Show the registred device for ppmu device
PM / devfreq: Fix the wrong description for userspace governor
PM / devfreq: Fix the checkpatch warnings
PM / devfreq: exynos-bus: Print the real clock rate of bus
PM / devfreq: exynos-ppmu: Use the regmap interface to handle the registers
PM / devfreq: exynos-bus: Add the detailed correlation for Exynos5433
PM / devfreq: Don't delete sysfs group twice
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This patch adds DT binding documentation for STMicroelectronics
DELTA V4L2 video decoder.
Acked-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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The idea is that without doing more calculations we extend zero pages to
same element pages for zram. zero page is special case of same element
page with zero element.
1. the test is done under android 7.0
2. startup too many applications circularly
3. sample the zero pages, same pages (none-zero element)
and total pages in function page_zero_filled
the result is listed as below:
ZERO SAME TOTAL
36214 17842 598196
ZERO/TOTAL SAME/TOTAL (ZERO+SAME)/TOTAL ZERO/SAME
AVERAGE 0.060631909 0.024990816 0.085622726 2.663825038
STDEV 0.00674612 0.005887625 0.009707034 2.115881328
MAX 0.069698422 0.030046087 0.094975336 7.56043956
MIN 0.03959586 0.007332205 0.056055193 1.928985507
from the above data, the benefit is about 2.5% and up to 3% of total
swapout pages.
The defect of the patch is that when we recovery a page from non-zero
element the operations are low efficient for partial read.
This patch extends zero_page to same_page so if there is any user to have
monitored zero_pages, he will be surprised if the number is increased but
it's not harmful, I believe.
Link: http://lkml.kernel.org/r/1483692145-75357-1-git-send-email-zhouxianrong@huawei.com
Link: http://lkml.kernel.org/r/1486307804-27903-1-git-send-email-minchan@kernel.org
Signed-off-by: zhouxianrong <zhouxianrong@huawei.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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If madvise(2) advice will result in the underlying vma being split and the
number of areas mapped by the process will exceed
/proc/sys/vm/max_map_count as a result, return ENOMEM instead of EAGAIN.
EAGAIN is returned by madvise(2) when a kernel resource, such as slab, is
temporarily unavailable. It indicates that userspace should retry the
advice in the near future. This is important for advice such as
MADV_DONTNEED which is often used by malloc implementations to free memory
back to the system: we really do want to free memory back when madvise(2)
returns EAGAIN because slab allocations (for vmas, anon_vmas, or
mempolicies) cannot be allocated.
Encountering /proc/sys/vm/max_map_count is not a temporary failure,
however, so return ENOMEM to indicate this is a more serious issue. A
followup patch to the man page will specify this behavior.
Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1701241431120.42507@chino.kir.corp.google.com
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Michael Kerrisk <mtk.manpages@googlemail.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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This patch adds the needed documentation for the use_zero_pages property.
Link: http://lkml.kernel.org/r/1484927522-1964-1-git-send-email-imbrenda@linux.vnet.ibm.com
Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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We had a deprecated_attr_warn() warning for 2 years and now the time has
come and we finally can do the cleanup.
The plan was as follows:
: per-stat sysfs attributes are considered to be deprecated.
: The basic strategy is:
: -- the existing RW nodes will be downgraded to WO nodes (in linux 4.11)
: -- deprecated RO sysfs nodes will eventually be removed (in linux 4.11)
:
: The list of deprecated attributes can be found here:
: Documentation/ABI/obsolete/sysfs-block-zram
:
: Basically, every attribute that has its own read accessible sysfs
: node (e.g. num_reads) *AND* is accessible via one of the stat files
: (zram<id>/stat or zram<id>/io_stat or zram<id>/mm_stat) is considered
: to be deprecated.
The patch also removes `obsolete/sysfs-block-zram', clean ups
`testing/sysfs-block-zram' and tweaks zram.txt files.
Link: http://lkml.kernel.org/r/20170118035838.11090-1-sergey.senozhatsky@gmail.com
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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There is no thp defrag option that currently allows MADV_HUGEPAGE regions
to do direct compaction and reclaim while all other thp allocations simply
trigger kswapd and kcompactd in the background and fail immediately.
The "defer" setting simply triggers background reclaim and compaction for
all regions, regardless of MADV_HUGEPAGE, which makes it unusable for our
userspace where MADV_HUGEPAGE is being used to indicate the application is
willing to wait for work for thp memory to be available.
The "madvise" setting will do direct compaction and reclaim for these
MADV_HUGEPAGE regions, but does not trigger kswapd and kcompactd in the
background for anybody else.
For reasonable usage, there needs to be a mesh between the two options.
This patch introduces a fifth mode, "defer+madvise", that will do direct
reclaim and compaction for MADV_HUGEPAGE regions and trigger background
reclaim and compaction for everybody else so that hugepages may be
available in the near future.
A proposal to allow direct reclaim and compaction for MADV_HUGEPAGE
regions as part of the "defer" mode, making it a very powerful setting and
avoids breaking userspace, was offered:
http://marc.info/?t=148236612700003. This additional mode is a
compromise.
A second proposal to allow both "defer" and "madvise" to be selected at
the same time was also offered: http://marc.info/?t=148357345300001. This
is possible, but there was a concern that it might break existing
userspaces the parse the output of the defrag mode, so the fifth option
was introduced instead.
This patch also cleans up the helper function for storing to "enabled" and
"defrag" since the former supports three modes while the latter supports
five and triple_flag_store() was getting unnecessarily messy.
Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1701101614330.41805@chino.kir.corp.google.com
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Both mm_vmscan_lru_shrink_active and mm_vmscan_lru_isolate have changed
so the script needs to be update to reflect those changes
Link: http://lkml.kernel.org/r/20170105151737.GU21618@dhcp22.suse.cz
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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SLUB creates a per-cache directory under /sys/kernel/slab which hosts a
bunch of debug files. Usually, there aren't that many caches on a system
and this doesn't really matter; however, if memcg is in use, each cache
can have per-cgroup sub-caches. SLUB creates the same directories for
these sub-caches under /sys/kernel/slab/$CACHE/cgroup.
Unfortunately, because there can be a lot of cgroups, active or draining,
the product of the numbers of caches, cgroups and files in each directory
can reach a very high number - hundreds of thousands is commonplace.
Millions and beyond aren't difficult to reach either.
What's under /sys/kernel/slab is primarily for debugging and the
information and control on the a root cache already cover its sub-caches.
While having a separate directory for each sub-cache can be helpful for
development, it doesn't make much sense to pay this amount of overhead by
default.
This patch introduces a boot parameter slub_memcg_sysfs which determines
whether to create sysfs directories for per-memcg sub-caches. It also
adds CONFIG_SLUB_MEMCG_SYSFS_ON which determines the boot parameter's
default value and defaults to 0.
Link: http://lkml.kernel.org/r/20170204145203.GB26958@mtj.duckdns.org
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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The conflict was an interaction between a bug fix in the
netvsc driver in 'net' and an optimization of the RX path
in 'net-next'.
Signed-off-by: David S. Miller <davem@davemloft.net>
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Both of these options are poorly named. The features they provide are
necessary for system security and should not be considered debug only.
Change the names to CONFIG_STRICT_KERNEL_RWX and
CONFIG_STRICT_MODULE_RWX to better describe what these options do.
Signed-off-by: Laura Abbott <labbott@redhat.com>
Acked-by: Jessica Yu <jeyu@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
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There are multiple architectures that support CONFIG_DEBUG_RODATA and
CONFIG_SET_MODULE_RONX. These options also now have the ability to be
turned off at runtime. Move these to an architecture independent
location and make these options def_bool y for almost all of those
arches.
Signed-off-by: Laura Abbott <labbott@redhat.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
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Add the documentation to avoid PHY lane swapping. This is a boolean
entry to notify the phy device drivers that the TX/RX lanes NO need
to be swapped.
The use case for this binding mostly happens after wrong HW
configuration of PHY IC during bootstrap.
Signed-off-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Shaohua Li <shli@fb.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/kvm-mips into HEAD
KVM: MIPS: GVA/GPA page tables, dirty logging, SYNC_MMU etc
Numerous MIPS KVM fixes, improvements, and features for 4.11, many of
which continue to pave the way for VZ support, the most interesting of
which are:
- Add GVA->HPA page tables for T&E, to cache GVA mappings.
- Generate fast-path TLB refill exception handler which loads host TLB
entries from GVA page table, avoiding repeated guest memory
translation and guest TLB lookups.
- Use uaccess macros when T&E needs to access guest memory, which with
GVA page tables and the Linux TLB refill handler improves robustness
against TLB faults and fixes EVA hosts.
- Use BadInstr/BadInstrP registers when available to obtain instruction
encodings after a synchronous trap.
- Add GPA->HPA page tables to replace the inflexible linear array,
allowing for multiple sparsely arranged memory regions.
- Properly implement dirty page logging.
- Add KVM_CAP_SYNC_MMU support so that changes in GPA mappings become
effective in guests even if they are already running, allowing for
copy-on-write, KSM, idle page tracking, swapping, and guest memory
ballooning.
- Add KVM_CAP_READONLY_MEM support, so writes to specified memory
regions are treated as MMIO.
- Implement proper CP0_EBase support in T&E.
- Expose a few more missing CP0 registers to userland.
- Add KVM_CAP_NR_VCPUS and KVM_CAP_MAX_VCPUS support, and allow up to 8
VCPUs to be created in a VM.
- Various cleanups and dropping of dead and duplicated code.
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git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into HEAD
The big feature this time is support for POWER9 using the radix-tree
MMU for host and guest. This required some changes to arch/powerpc
code, so I talked with Michael Ellerman and he created a topic branch
with this patchset, which I merged into kvm-ppc-next and which Michael
will pull into his tree. Michael also put in some patches from Nick
Piggin which fix bugs in the interrupt vector code in relocatable
kernels when coming from a KVM guest.
Other notable changes include:
* Add the ability to change the size of the hashed page table,
from David Gibson.
* XICS (interrupt controller) emulation fixes and improvements,
from Li Zhong.
* Bug fixes from myself and Thomas Huth.
These patches define some new KVM capabilities and ioctls, but there
should be no conflicts with anything else currently upstream, as far
as I am aware.
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Add a hypercall to retrieve the host realtime clock and the TSC value
used to calculate that clock read.
Used to implement clock synchronization between host and guest.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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* next/defconfig:
ARM: sunxi: Add CONFIG_THERMAL_OF
* next/drivers:
soc: samsung: pmu: Add register defines for pad retention control
reset: make zx2967 explicitly non-modular
reset: core: fix reset_control_put
soc: samsung: pm_domains: Read domain name from the new label property
soc: samsung: pm_domains: Remove message about failed memory allocation
soc: samsung: pm_domains: Remove unused name field
soc: samsung: pm_domains: Use full names in subdomains registration log
* next/soc:
ARM: ep93xx: Disable TS-72xx watchdog before uncompressing
ARM: ux500: cut some platform data
MAINTAINERS: Update for the current location of the bcm2835 tree.
arm: mvebu: support for SMP on 98DX3336 SoC
arm: sunxi: add support for V3s SoC
ARM: sunxi: add support for H2+ SoC
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