29 Jul, 2016
40 commits
-
Pull tracing updates from Steven Rostedt:
"This is mostly clean ups and small fixes. Some of the more visible
changes are:- The function pid code uses the event pid filtering logic
- [ku]probe events have access to current->comm
- trace_printk now has sample code
- PCI devices now trace physical addresses
- stack tracing has less unnessary functions traced"* tag 'trace-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
printk, tracing: Avoiding unneeded blank lines
tracing: Use __get_str() when manipulating strings
tracing, RAS: Cleanup on __get_str() usage
tracing: Use outer () on __get_str() definition
ftrace: Reduce size of function graph entries
tracing: Have HIST_TRIGGERS select TRACING
tracing: Using for_each_set_bit() to simplify trace_pid_write()
ftrace: Move toplevel init out of ftrace_init_tracefs()
tracing/function_graph: Fix filters for function_graph threshold
tracing: Skip more functions when doing stack tracing of events
tracing: Expose CPU physical addresses (resource values) for PCI devices
tracing: Show the preempt count of when the event was called
tracing: Add trace_printk sample code
tracing: Choose static tp_printk buffer by explicit nesting count
tracing: expose current->comm to [ku]probe events
ftrace: Have set_ftrace_pid use the bitmap like events do
tracing: Move pid_list write processing into its own function
tracing: Move the pid_list seq_file functions to be global
tracing: Move filtered_pid helper functions into trace.c
tracing: Make the pid filtering helper functions global -
Pull VFIO updates from Alex Williamson:
- Enable no-iommu mode for platform devices (Peng Fan)
- Sub-page mmap for exclusive pages (Yongji Xie)
- Use-after-free fix (Ilya Lesokhin)
- Support for ACPI-based platform devices (Sinan Kaya)* tag 'vfio-v4.8-rc1' of git://github.com/awilliam/linux-vfio:
vfio: platform: check reset call return code during release
vfio: platform: check reset call return code during open
vfio, platform: make reset driver a requirement by default
vfio: platform: call _RST method when using ACPI
vfio: platform: add extra debug info argument to call reset
vfio: platform: add support for ACPI probe
vfio: platform: determine reset capability
vfio: platform: move reset call to a common function
vfio: platform: rename reset function
vfio: fix possible use after free of vfio group
vfio-pci: Allow to mmap sub-page MMIO BARs if the mmio page is exclusive
vfio: platform: support No-IOMMU mode -
Pull MD updates from Shaohua Li:
- A bunch of patches from Neil Brown to fix RCU usage
- Two performance improvement patches from Tomasz Majchrzak
- Alexey Obitotskiy fixes module refcount issue
- Arnd Bergmann fixes time granularity
- Cong Wang fixes a list corruption issue
- Guoqing Jiang fixes a deadlock in md-cluster
- A null pointer deference fix from me
- Song Liu fixes misuse of raid6 rmw
- Other trival/cleanup fixes from Guoqing Jiang and Xiao Ni* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md: (28 commits)
MD: fix null pointer deference
raid10: improve random reads performance
md: add missing sysfs_notify on array_state update
Fix kernel module refcount handling
md: use seconds granularity for error logging
md: reduce the number of synchronize_rcu() calls when multiple devices fail.
md: be extra careful not to take a reference to a Faulty device.
md/multipath: add rcu protection to rdev access in multipath_status.
md/raid5: add rcu protection to rdev accesses in raid5_status.
md/raid5: add rcu protection to rdev accesses in want_replace
md/raid5: add rcu protection to rdev accesses in handle_failed_sync.
md/raid1: add rcu protection to rdev in fix_read_error
md/raid1: small code cleanup in end_sync_write
md/raid1: small cleanup in raid1_end_read/write_request
md/raid10: simplify print_conf a little.
md/raid10: minor code improvement in fix_read_error()
md/raid10: add rcu protection to rdev access during reshape.
md/raid10: add rcu protection to rdev access in raid10_sync_request.
md/raid10: add rcu protection in raid10_status.
md/raid10: fix refounct imbalance when resyncing an array with a replacement device.
... -
Pull libnvdimm updates from Dan Williams:
- Replace pcommit with ADR / directed-flushing.
The pcommit instruction, which has not shipped on any product, is
deprecated. Instead, the requirement is that platforms implement
either ADR, or provide one or more flush addresses per nvdimm.ADR (Asynchronous DRAM Refresh) flushes data in posted write buffers
to the memory controller on a power-fail event.Flush addresses are defined in ACPI 6.x as an NVDIMM Firmware
Interface Table (NFIT) sub-structure: "Flush Hint Address Structure".
A flush hint is an mmio address that when written and fenced assures
that all previous posted writes targeting a given dimm have been
flushed to media.- On-demand ARS (address range scrub).
Linux uses the results of the ACPI ARS commands to track bad blocks
in pmem devices. When latent errors are detected we re-scrub the
media to refresh the bad block list, userspace can also request a
re-scrub at any time.- Support for the Microsoft DSM (device specific method) command
format.- Support for EDK2/OVMF virtual disk device memory ranges.
- Various fixes and cleanups across the subsystem.
* tag 'libnvdimm-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: (41 commits)
libnvdimm-btt: Delete an unnecessary check before the function call "__nd_device_register"
nfit: do an ARS scrub on hitting a latent media error
nfit: move to nfit/ sub-directory
nfit, libnvdimm: allow an ARS scrub to be triggered on demand
libnvdimm: register nvdimm_bus devices with an nd_bus driver
pmem: clarify a debug print in pmem_clear_poison
x86/insn: remove pcommit
Revert "KVM: x86: add pcommit support"
nfit, tools/testing/nvdimm/: unify shutdown paths
libnvdimm: move ->module to struct nvdimm_bus_descriptor
nfit: cleanup acpi_nfit_init calling convention
nfit: fix _FIT evaluation memory leak + use after free
tools/testing/nvdimm: add manufacturing_{date|location} dimm properties
tools/testing/nvdimm: add virtual ramdisk range
acpi, nfit: treat virtual ramdisk SPA as pmem region
pmem: kill __pmem address space
pmem: kill wmb_pmem()
libnvdimm, pmem: use nvdimm_flush() for namespace I/O writes
fs/dax: remove wmb_pmem()
libnvdimm, pmem: flush posted-write queues on shutdown
... -
Pull pin control updates from Linus Walleij:
"This is the bulk of pin control changes for the v4.8 kernel cycle.Nothing stands out as especially exiting: new drivers, new subdrivers,
lots of cleanups and incremental features.Business as usual.
New drivers:
- New driver for Oxnas pin control and GPIO. This ARM-based chipset
is used in a few storage (NAS) type devices.- New driver for the MAX77620/MAX20024 pin controller portions.
- New driver for the Intel Merrifield pin controller.
New subdrivers:
- New subdriver for the Qualcomm MDM9615
- New subdriver for the STM32F746 MCU
- New subdriver for the Broadcom NSP SoC.
Cleanups:
- Demodularization of bool compiled-in drivers.
Apart from this there is just regular incremental improvements to a
lot of drivers, especially Uniphier and PFC"* tag 'pinctrl-v4.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: (131 commits)
pinctrl: fix pincontrol definition for marvell
pinctrl: xway: fix typo
Revert "pinctrl: amd: make it explicitly non-modular"
pinctrl: iproc: Add NSP and Stingray GPIO support
pinctrl: Update iProc GPIO DT bindings
pinctrl: bcm: add OF dependencies
pinctrl: ns2: remove redundant dev_err call in ns2_pinmux_probe()
pinctrl: Add STM32F746 MCU support
pinctrl: intel: Protect set wake flow by spin lock
pinctrl: nsp: remove redundant dev_err call in nsp_pinmux_probe()
pinctrl: uniphier: add Ethernet pin-mux settings
sh-pfc: Use PTR_ERR_OR_ZERO() to simplify the code
pinctrl: ns2: fix return value check in ns2_pinmux_probe()
pinctrl: qcom: update DT bindings with ebi2 groups
pinctrl: qcom: establish proper EBI2 pin groups
pinctrl: imx21: Remove the MODULE_DEVICE_TABLE() macro
Documentation: dt: Add new compatible to STM32 pinctrl driver bindings
includes: dt-bindings: Add STM32F746 pinctrl DT bindings
pinctrl: sunxi: fix nand0 function name for sun8i
pinctrl: uniphier: remove pointless pin-mux settings for PH1-LD11
... -
Merge more updates from Andrew Morton:
"The rest of MM"* emailed patches from Andrew Morton : (101 commits)
mm, compaction: simplify contended compaction handling
mm, compaction: introduce direct compaction priority
mm, thp: remove __GFP_NORETRY from khugepaged and madvised allocations
mm, page_alloc: make THP-specific decisions more generic
mm, page_alloc: restructure direct compaction handling in slowpath
mm, page_alloc: don't retry initial attempt in slowpath
mm, page_alloc: set alloc_flags only once in slowpath
lib/stackdepot.c: use __GFP_NOWARN for stack allocations
mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB
mm, kasan: account for object redzone in SLUB's nearest_obj()
mm: fix use-after-free if memory allocation failed in vma_adjust()
zsmalloc: Delete an unnecessary check before the function call "iput"
mm/memblock.c: fix index adjustment error in __next_mem_range_rev()
mem-hotplug: alloc new page from a nearest neighbor node when mem-offline
mm: optimize copy_page_to/from_iter_iovec
mm: add cond_resched() to generic_swapfile_activate()
Revert "mm, mempool: only set __GFP_NOMEMALLOC if there are free elements"
mm, compaction: don't isolate PageWriteback pages in MIGRATE_SYNC_LIGHT mode
mm: hwpoison: remove incorrect comments
make __section_nr() more efficient
... -
Async compaction detects contention either due to failing trylock on
zone->lock or lru_lock, or by need_resched(). Since 1f9efdef4f3f ("mm,
compaction: khugepaged should not give up due to need_resched()") the
code got quite complicated to distinguish these two up to the
__alloc_pages_slowpath() level, so different decisions could be taken
for khugepaged allocations.After the recent changes, khugepaged allocations don't check for
contended compaction anymore, so we again don't need to distinguish lock
and sched contention, and simplify the current convoluted code a lot.However, I believe it's also possible to simplify even more and
completely remove the check for contended compaction after the initial
async compaction for costly orders, which was originally aimed at THP
page fault allocations. There are several reasons why this can be done
now:- with the new defaults, THP page faults no longer do reclaim/compaction at
all, unless the system admin has overridden the default, or application has
indicated via madvise that it can benefit from THP's. In both cases, it
means that the potential extra latency is expected and worth the benefits.
- even if reclaim/compaction proceeds after this patch where it previously
wouldn't, the second compaction attempt is still async and will detect the
contention and back off, if the contention persists
- there are still heuristics like deferred compaction and pageblock skip bits
in place that prevent excessive THP page fault latenciesLink: http://lkml.kernel.org/r/20160721073614.24395-9-vbabka@suse.cz
Signed-off-by: Vlastimil Babka
Acked-by: Michal Hocko
Acked-by: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
In the context of direct compaction, for some types of allocations we
would like the compaction to either succeed or definitely fail while
trying as hard as possible. Current async/sync_light migration mode is
insufficient, as there are heuristics such as caching scanner positions,
marking pageblocks as unsuitable or deferring compaction for a zone. At
least the final compaction attempt should be able to override these
heuristics.To communicate how hard compaction should try, we replace migration mode
with a new enum compact_priority and change the relevant function
signatures. In compact_zone_order() where struct compact_control is
constructed, the priority is mapped to suitable control flags. This
patch itself has no functional change, as the current priority levels
are mapped back to the same migration modes as before. Expanding them
will be done next.Note that !CONFIG_COMPACTION variant of try_to_compact_pages() is
removed, as the only caller exists under CONFIG_COMPACTION.Link: http://lkml.kernel.org/r/20160721073614.24395-8-vbabka@suse.cz
Signed-off-by: Vlastimil Babka
Acked-by: Michal Hocko
Acked-by: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
After the previous patch, we can distinguish costly allocations that
should be really lightweight, such as THP page faults, with
__GFP_NORETRY. This means we don't need to recognize khugepaged
allocations via PF_KTHREAD anymore. We can also change THP page faults
in areas where madvise(MADV_HUGEPAGE) was used to try as hard as
khugepaged, as the process has indicated that it benefits from THP's and
is willing to pay some initial latency costs.We can also make the flags handling less cryptic by distinguishing
GFP_TRANSHUGE_LIGHT (no reclaim at all, default mode in page fault) from
GFP_TRANSHUGE (only direct reclaim, khugepaged default). Adding
__GFP_NORETRY or __GFP_KSWAPD_RECLAIM is done where needed.The patch effectively changes the current GFP_TRANSHUGE users as
follows:* get_huge_zero_page() - the zero page lifetime should be relatively
long and it's shared by multiple users, so it's worth spending some
effort on it. We use GFP_TRANSHUGE, and __GFP_NORETRY is not added.
This also restores direct reclaim to this allocation, which was
unintentionally removed by commit e4a49efe4e7e ("mm: thp: set THP defrag
by default to madvise and add a stall-free defrag option")* alloc_hugepage_khugepaged_gfpmask() - this is khugepaged, so latency
is not an issue. So if khugepaged "defrag" is enabled (the default), do
reclaim via GFP_TRANSHUGE without __GFP_NORETRY. We can remove the
PF_KTHREAD check from page alloc.As a side-effect, khugepaged will now no longer check if the initial
compaction was deferred or contended. This is OK, as khugepaged sleep
times between collapsion attempts are long enough to prevent noticeable
disruption, so we should allow it to spend some effort.* migrate_misplaced_transhuge_page() - already was masking out
__GFP_RECLAIM, so just convert to GFP_TRANSHUGE_LIGHT which is
equivalent.* alloc_hugepage_direct_gfpmask() - vma's with VM_HUGEPAGE (via madvise)
are now allocating without __GFP_NORETRY. Other vma's keep using
__GFP_NORETRY if direct reclaim/compaction is at all allowed (by default
it's allowed only for madvised vma's). The rest is conversion to
GFP_TRANSHUGE(_LIGHT).[mhocko@suse.com: suggested GFP_TRANSHUGE_LIGHT]
Link: http://lkml.kernel.org/r/20160721073614.24395-7-vbabka@suse.cz
Signed-off-by: Vlastimil Babka
Acked-by: Michal Hocko
Acked-by: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Since THP allocations during page faults can be costly, extra decisions
are employed for them to avoid excessive reclaim and compaction, if the
initial compaction doesn't look promising. The detection has never been
perfect as there is no gfp flag specific to THP allocations. At this
moment it checks the whole combination of flags that makes up
GFP_TRANSHUGE, and hopes that no other users of such combination exist,
or would mind being treated the same way. Extra care is also taken to
separate allocations from khugepaged, where latency doesn't matter that
much.It is however possible to distinguish these allocations in a simpler and
more reliable way. The key observation is that after the initial
compaction followed by the first iteration of "standard"
reclaim/compaction, both __GFP_NORETRY allocations and costly
allocations without __GFP_REPEAT are declared as failures:/* Do not loop if specifically requested */
if (gfp_mask & __GFP_NORETRY)
goto nopage;/*
* Do not retry costly high order allocations unless they are
* __GFP_REPEAT
*/
if (order > PAGE_ALLOC_COSTLY_ORDER && !(gfp_mask & __GFP_REPEAT))
goto nopage;This means we can further distinguish allocations that are costly order
*and* additionally include the __GFP_NORETRY flag. As it happens,
GFP_TRANSHUGE allocations do already fall into this category. This will
also allow other costly allocations with similar high-order benefit vs
latency considerations to use this semantic. Furthermore, we can
distinguish THP allocations that should try a bit harder (such as from
khugepageed) by removing __GFP_NORETRY, as will be done in the next
patch.Link: http://lkml.kernel.org/r/20160721073614.24395-6-vbabka@suse.cz
Signed-off-by: Vlastimil Babka
Acked-by: Michal Hocko
Acked-by: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The retry loop in __alloc_pages_slowpath is supposed to keep trying
reclaim and compaction (and OOM), until either the allocation succeeds,
or returns with failure. Success here is more probable when reclaim
precedes compaction, as certain watermarks have to be met for compaction
to even try, and more free pages increase the probability of compaction
success. On the other hand, starting with light async compaction (if
the watermarks allow it), can be more efficient, especially for smaller
orders, if there's enough free memory which is just fragmented.Thus, the current code starts with compaction before reclaim, and to
make sure that the last reclaim is always followed by a final
compaction, there's another direct compaction call at the end of the
loop. This makes the code hard to follow and adds some duplicated
handling of migration_mode decisions. It's also somewhat inefficient
that even if reclaim or compaction decides not to retry, the final
compaction is still attempted. Some gfp flags combination also shortcut
these retry decisions by "goto noretry;", making it even harder to
follow.This patch attempts to restructure the code with only minimal functional
changes. The call to the first compaction and THP-specific checks are
now placed above the retry loop, and the "noretry" direct compaction is
removed.The initial compaction is additionally restricted only to costly orders,
as we can expect smaller orders to be held back by watermarks, and only
larger orders to suffer primarily from fragmentation. This better
matches the checks in reclaim's shrink_zones().There are two other smaller functional changes. One is that the upgrade
from async migration to light sync migration will always occur after the
initial compaction. This is how it has been until recent patch "mm,
oom: protect !costly allocations some more", which introduced upgrading
the mode based on COMPACT_COMPLETE result, but kept the final compaction
always upgraded, which made it even more special. It's better to return
to the simpler handling for now, as migration modes will be further
modified later in the series.The second change is that once both reclaim and compaction declare it's
not worth to retry the reclaim/compact loop, there is no final
compaction attempt. As argued above, this is intentional. If that
final compaction were to succeed, it would be due to a wrong retry
decision, or simply a race with somebody else freeing memory for us.The main outcome of this patch should be simpler code. Logically, the
initial compaction without reclaim is the exceptional case to the
reclaim/compaction scheme, but prior to the patch, it was the last loop
iteration that was exceptional. Now the code matches the logic better.
The change also enable the following patches.Link: http://lkml.kernel.org/r/20160721073614.24395-5-vbabka@suse.cz
Signed-off-by: Vlastimil Babka
Acked-by: Michal Hocko
Acked-by: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
After __alloc_pages_slowpath() sets up new alloc_flags and wakes up
kswapd, it first tries get_page_from_freelist() with the new
alloc_flags, as it may succeed e.g. due to using min watermark instead
of low watermark. It makes sense to to do this attempt before adjusting
zonelist based on alloc_flags/gfp_mask, as it's still relatively a fast
path if we just wake up kswapd and successfully allocate.This patch therefore moves the initial attempt above the retry label and
reorganizes a bit the part below the retry label. We still have to
attempt get_page_from_freelist() on each retry, as some allocations
cannot do that as part of direct reclaim or compaction, and yet are not
allowed to fail (even though they do a WARN_ON_ONCE() and thus should
not exist). We can reuse the call meant for ALLOC_NO_WATERMARKS attempt
and just set alloc_flags to ALLOC_NO_WATERMARKS if the context allows
it. As a side-effect, the attempts from direct reclaim/compaction will
also no longer obey watermarks once this is set, but there's little harm
in that.Kswapd wakeups are also done on each retry to be safe from potential
races resulting in kswapd going to sleep while a process (that may not
be able to reclaim by itself) is still looping.Link: http://lkml.kernel.org/r/20160721073614.24395-4-vbabka@suse.cz
Signed-off-by: Vlastimil Babka
Acked-by: Michal Hocko
Acked-by: Mel Gorman
Acked-by: David Rientjes
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
In __alloc_pages_slowpath(), alloc_flags doesn't change after it's
initialized, so move the initialization above the retry: label. Also
make the comment above the initialization more descriptive.The only exception in the alloc_flags being constant is
ALLOC_NO_WATERMARKS, which may change due to TIF_MEMDIE being set on the
allocating thread. We can fix this, and make the code simpler and a bit
more effective at the same time, by moving the part that determines
ALLOC_NO_WATERMARKS from gfp_to_alloc_flags() to gfp_pfmemalloc_allowed().This means we don't have to mask out ALLOC_NO_WATERMARKS in numerous
places in __alloc_pages_slowpath() anymore. The only two tests for the
flag can instead call gfp_pfmemalloc_allowed().Link: http://lkml.kernel.org/r/20160721073614.24395-3-vbabka@suse.cz
Signed-off-by: Vlastimil Babka
Acked-by: Michal Hocko
Acked-by: Mel Gorman
Acked-by: David Rientjes
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This (large, atomic) allocation attempt can fail. We expect and handle
that, so avoid the scary warning.Link: http://lkml.kernel.org/r/20160720151905.GB19146@node.shutemov.name
Cc: Andrey Ryabinin
Cc: Alexander Potapenko
Cc: Michal Hocko
Cc: Rik van Riel
Cc: David Rientjes
Cc: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
For KASAN builds:
- switch SLUB allocator to using stackdepot instead of storing the
allocation/deallocation stacks in the objects;
- change the freelist hook so that parts of the freelist can be put
into the quarantine.[aryabinin@virtuozzo.com: fixes]
Link: http://lkml.kernel.org/r/1468601423-28676-1-git-send-email-aryabinin@virtuozzo.com
Link: http://lkml.kernel.org/r/1468347165-41906-3-git-send-email-glider@google.com
Signed-off-by: Alexander Potapenko
Cc: Andrey Konovalov
Cc: Christoph Lameter
Cc: Dmitry Vyukov
Cc: Steven Rostedt (Red Hat)
Cc: Joonsoo Kim
Cc: Kostya Serebryany
Cc: Andrey Ryabinin
Cc: Kuthonuzo Luruo
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
When looking up the nearest SLUB object for a given address, correctly
calculate its offset if SLAB_RED_ZONE is enabled for that cache.Previously, when KASAN had detected an error on an object from a cache
with SLAB_RED_ZONE set, the actual start address of the object was
miscalculated, which led to random stacks having been reported.When looking up the nearest SLUB object for a given address, correctly
calculate its offset if SLAB_RED_ZONE is enabled for that cache.Fixes: 7ed2f9e663854db ("mm, kasan: SLAB support")
Link: http://lkml.kernel.org/r/1468347165-41906-2-git-send-email-glider@google.com
Signed-off-by: Alexander Potapenko
Cc: Andrey Konovalov
Cc: Christoph Lameter
Cc: Dmitry Vyukov
Cc: Steven Rostedt (Red Hat)
Cc: Joonsoo Kim
Cc: Kostya Serebryany
Cc: Andrey Ryabinin
Cc: Kuthonuzo Luruo
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
There's one case when vma_adjust() expands the vma, overlapping with
*two* next vma. See case 6 of mprotect, described in the comment to
vma_merge().To handle this (and only this) situation we iterate twice over main part
of the function. See "goto again".Vegard reported[1] that he sees out-of-bounds access complain from
KASAN, if anon_vma_clone() on the *second* iteration fails.This happens because we free 'next' vma by the end of first iteration
and don't have a way to undo this if anon_vma_clone() fails on the
second iteration.The solution is to do all required allocations upfront, before we touch
vmas.The allocation on the second iteration is only required if first two
vmas don't have anon_vma, but third does. So we need, in total, one
anon_vma_clone() call.It's easy to adjust 'exporter' to the third vma for such case.
[1] http://lkml.kernel.org/r/1469514843-23778-1-git-send-email-vegard.nossum@oracle.com
Link: http://lkml.kernel.org/r/1469625255-126641-1-git-send-email-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov
Reported-by: Vegard Nossum
Cc: Rik van Riel
Cc: Vlastimil Babka
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
iput() tests whether its argument is NULL and then returns immediately.
Thus the test around the call is not needed.This issue was detected by using the Coccinelle software.
Link: http://lkml.kernel.org/r/559cf499-4a01-25f9-c87f-24d906626a57@users.sourceforge.net
Signed-off-by: Markus Elfring
Reviewed-by: Sergey Senozhatsky
Acked-by: Minchan Kim
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Fix region index adjustment error when parameter type_b of
__next_mem_range_rev() == NULL.Signed-off-by: zijun_hu
Cc: Alexander Kuleshov
Cc: Ard Biesheuvel
Cc: Tang Chen
Cc: Wei Yang
Cc: Tang Chen
Cc: Richard Leitner
Cc: David Gibson
Cc: Tejun Heo
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
If we offline a node, alloc the new page from a nearest neighbor node
instead of the current node or other remote nodes, because re-migrate is
a waste of time and the distance of the remote nodes is often very
large.Also use GFP_HIGHUSER_MOVABLE to alloc new page if the zone is movable
zone or highmem zone.Link: http://lkml.kernel.org/r/5795E18B.5060302@huawei.com
Signed-off-by: Xishi Qiu
Cc: Joonsoo Kim
Cc: Vlastimil Babka
Cc: Naoya Horiguchi
Cc: David Rientjes
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
copy_page_to_iter_iovec() and copy_page_from_iter_iovec() copy some data
to userspace or from userspace. These functions have a fast path where
they map a page using kmap_atomic and a slow path where they use kmap.kmap is slower than kmap_atomic, so the fast path is preferred.
However, on kernels without highmem support, kmap just calls
page_address, so there is no need to avoid kmap. On kernels without
highmem support, the fast path just increases code size (and cache
footprint) and it doesn't improve copy performance in any way.This patch enables the fast path only if CONFIG_HIGHMEM is defined.
Code size reduced by this patch:
x86 (without highmem) 928
x86-64 960
sparc64 848
alpha 1136
pa-risc 1200[akpm@linux-foundation.org: use IS_ENABLED(), per Andi]
Link: http://lkml.kernel.org/r/alpine.LRH.2.02.1607221711410.4818@file01.intranet.prod.int.rdu2.redhat.com
Signed-off-by: Mikulas Patocka
Cc: Hugh Dickins
Cc: Michal Hocko
Cc: Alexander Viro
Cc: Mel Gorman
Cc: Johannes Weiner
Cc: Andi Kleen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
generic_swapfile_activate() can take quite long time, it iterates over
all blocks of a file, so add cond_resched to it. I observed about 1
second stalls when activating a swapfile that was almost unfragmented -
this patch fixes it.Link: http://lkml.kernel.org/r/alpine.LRH.2.02.1607221710580.4818@file01.intranet.prod.int.rdu2.redhat.com
Signed-off-by: Mikulas Patocka
Acked-by: Michal Hocko
Cc: Hugh Dickins
Cc: Alexander Viro
Cc: Mel Gorman
Cc: Johannes Weiner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This reverts commit f9054c70d28b ("mm, mempool: only set __GFP_NOMEMALLOC
if there are free elements").There has been a report about OOM killer invoked when swapping out to a
dm-crypt device. The primary reason seems to be that the swapout out IO
managed to completely deplete memory reserves. Ondrej was able to
bisect and explained the issue by pointing to f9054c70d28b ("mm,
mempool: only set __GFP_NOMEMALLOC if there are free elements").The reason is that the swapout path is not throttled properly because
the md-raid layer needs to allocate from the generic_make_request path
which means it allocates from the PF_MEMALLOC context. dm layer uses
mempool_alloc in order to guarantee a forward progress which used to
inhibit access to memory reserves when using page allocator. This has
changed by f9054c70d28b ("mm, mempool: only set __GFP_NOMEMALLOC if
there are free elements") which has dropped the __GFP_NOMEMALLOC
protection when the memory pool is depleted.If we are running out of memory and the only way forward to free memory
is to perform swapout we just keep consuming memory reserves rather than
throttling the mempool allocations and allowing the pending IO to
complete up to a moment when the memory is depleted completely and there
is no way forward but invoking the OOM killer. This is less than
optimal.The original intention of f9054c70d28b was to help with the OOM
situations where the oom victim depends on mempool allocation to make a
forward progress. David has mentioned the following backtrace:schedule
schedule_timeout
io_schedule_timeout
mempool_alloc
__split_and_process_bio
dm_request
generic_make_request
submit_bio
mpage_readpages
ext4_readpages
__do_page_cache_readahead
ra_submit
filemap_fault
handle_mm_fault
__do_page_fault
do_page_fault
page_faultWe do not know more about why the mempool is depleted without being
replenished in time, though. In any case the dm layer shouldn't depend
on any allocations outside of the dedicated pools so a forward progress
should be guaranteed. If this is not the case then the dm should be
fixed rather than papering over the problem and postponing it to later
by accessing more memory reserves.mempools are a mechanism to maintain dedicated memory reserves to
guaratee forward progress. Allowing them an unbounded access to the
page allocator memory reserves is going against the whole purpose of
this mechanism.Bisected by Ondrej Kozina.
[akpm@linux-foundation.org: coding-style fixes]
Link: http://lkml.kernel.org/r/20160721145309.GR26379@dhcp22.suse.cz
Signed-off-by: Michal Hocko
Reported-by: Ondrej Kozina
Reviewed-by: Johannes Weiner
Acked-by: NeilBrown
Cc: David Rientjes
Cc: Mikulas Patocka
Cc: Ondrej Kozina
Cc: Tetsuo Handa
Cc: Mel Gorman
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
At present MIGRATE_SYNC_LIGHT is allowing __isolate_lru_page() to
isolate a PageWriteback page, which __unmap_and_move() then rejects with
-EBUSY: of course the writeback might complete in between, but that's
not what we usually expect, so probably better not to isolate it.When tested by stress-highalloc from mmtests, this has reduced the
number of page migrate failures by 60-70%.Link: http://lkml.kernel.org/r/20160721073614.24395-2-vbabka@suse.cz
Signed-off-by: Hugh Dickins
Signed-off-by: Vlastimil Babka
Acked-by: Michal Hocko
Acked-by: Mel Gorman
Acked-by: David Rientjes
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
dequeue_hwpoisoned_huge_page() can be called without page lock hold, so
let's remove incorrect comment.The reason why the page lock is not really needed is that
dequeue_hwpoisoned_huge_page() checks page_huge_active() inside
hugetlb_lock, which allows us to avoid trying to dequeue a hugepage that
are just allocated but not linked to active list yet, even without
taking page lock.Link: http://lkml.kernel.org/r/20160720092901.GA15995@www9186uo.sakura.ne.jp
Signed-off-by: Naoya Horiguchi
Reported-by: Zhan Chen
Acked-by: Michal Hocko
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
When CONFIG_SPARSEMEM_EXTREME is disabled, __section_nr can get the
section number with a subtraction directly.Link: http://lkml.kernel.org/r/1468988310-11560-1-git-send-email-zhouchengming1@huawei.com
Signed-off-by: Zhou Chengming
Cc: Dave Hansen
Cc: Tejun Heo
Cc: Hanjun Guo
Cc: Li Bin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
If the user tries to disable automatic scanning early in the boot
process using e.g.:echo scan=off > /sys/kernel/debug/kmemleak
then this command will hang until SECS_FIRST_SCAN (= 60) seconds have
elapsed, even though the system is fully initialised.We can fix this using interruptible sleep and checking if we're supposed
to stop whenever we wake up (like the rest of the code does).Link: http://lkml.kernel.org/r/1468835005-2873-1-git-send-email-vegard.nossum@oracle.com
Signed-off-by: Vegard Nossum
Acked-by: Catalin Marinas
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
When booting an ACPI enabled kernel with 'mem=x', there is the
possibility that ACPI data regions from the firmware will lie above the
memory limit. Ordinarily these will be removed by
memblock_enforce_memory_limit(.).Unfortunately, this means that these regions will then be mapped by
acpi_os_ioremap(.) as device memory (instead of normal) thus unaligned
accessess will then provoke alignment faults.In this patch we adopt memblock_mem_limit_remove_map instead, and this
preserves these ACPI data regions (marked NOMAP) thus ensuring that
these regions are not mapped as device memory.For example, below is an alignment exception observed on ARM platform
when booting the kernel with 'acpi=on mem=8G':...
Unable to handle kernel paging request at virtual address ffff0000080521e7
pgd = ffff000008aa0000
[ffff0000080521e7] *pgd=000000801fffe003, *pud=000000801fffd003, *pmd=000000801fffc003, *pte=00e80083ff1c1707
Internal error: Oops: 96000021 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.7.0-rc3-next-20160616+ #172
Hardware name: AMD Overdrive/Supercharger/Default string, BIOS ROD1001A 02/09/2016
task: ffff800001ef0000 ti: ffff800001ef8000 task.ti: ffff800001ef8000
PC is at acpi_ns_lookup+0x520/0x734
LR is at acpi_ns_lookup+0x4a4/0x734
pc : [] lr : [] pstate: 60000045
sp : ffff800001efb8b0
x29: ffff800001efb8c0 x28: 000000000000001b
x27: 0000000000000001 x26: 0000000000000000
x25: ffff800001efb9e8 x24: ffff000008a10000
x23: 0000000000000001 x22: 0000000000000001
x21: ffff000008724000 x20: 000000000000001b
x19: ffff0000080521e7 x18: 000000000000000d
x17: 00000000000038ff x16: 0000000000000002
x15: 0000000000000007 x14: 0000000000007fff
x13: ffffff0000000000 x12: 0000000000000018
x11: 000000001fffd200 x10: 00000000ffffff76
x9 : 000000000000005f x8 : ffff000008725fa8
x7 : ffff000008a8df70 x6 : ffff000008a8df70
x5 : ffff000008a8d000 x4 : 0000000000000010
x3 : 0000000000000010 x2 : 000000000000000c
x1 : 0000000000000006 x0 : 0000000000000000
...
acpi_ns_lookup+0x520/0x734
acpi_ds_load1_begin_op+0x174/0x4fc
acpi_ps_build_named_op+0xf8/0x220
acpi_ps_create_op+0x208/0x33c
acpi_ps_parse_loop+0x204/0x838
acpi_ps_parse_aml+0x1bc/0x42c
acpi_ns_one_complete_parse+0x1e8/0x22c
acpi_ns_parse_table+0x8c/0x128
acpi_ns_load_table+0xc0/0x1e8
acpi_tb_load_namespace+0xf8/0x2e8
acpi_load_tables+0x7c/0x110
acpi_init+0x90/0x2c0
do_one_initcall+0x38/0x12c
kernel_init_freeable+0x148/0x1ec
kernel_init+0x10/0xec
ret_from_fork+0x10/0x40
Code: b9009fbc 2a00037b 36380057 3219037b (b9400260)
---[ end trace 03381e5eb0a24de4 ]---
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000bWith 'efi=debug', we can see those ACPI regions loaded by firmware on
that board as:efi: 0x0083ff185000-0x0083ff1b4fff [Reserved | | | | | | | | |WB|WT|WC|UC]*
efi: 0x0083ff1b5000-0x0083ff1c2fff [ACPI Reclaim Memory| | | | | | | | |WB|WT|WC|UC]*
efi: 0x0083ff223000-0x0083ff224fff [ACPI Memory NVS | | | | | | | | |WB|WT|WC|UC]*Link: http://lkml.kernel.org/r/1468475036-5852-3-git-send-email-dennis.chen@arm.com
Acked-by: Steve Capper
Signed-off-by: Dennis Chen
Cc: Catalin Marinas
Cc: Ard Biesheuvel
Cc: Pekka Enberg
Cc: Mel Gorman
Cc: Tang Chen
Cc: Tony Luck
Cc: Ingo Molnar
Cc: Rafael J. Wysocki
Cc: Will Deacon
Cc: Mark Rutland
Cc: Matt Fleming
Cc: Kaly Xin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
In some cases, memblock is queried by kernel to determine whether a
specified address is RAM or not. For example, the ACPI core needs this
information to determine which attributes to use when mapping ACPI
regions(acpi_os_ioremap). Use of incorrect memory types can result in
faults, data corruption, or other issues.Removing memory with memblock_enforce_memory_limit() throws away this
information, and so a kernel booted with 'mem=' may suffer from the
issues described above. To avoid this, we need to keep those NOMAP
regions instead of removing all above the limit, which preserves the
information we need while preventing other use of those regions.This patch adds new infrastructure to retain all NOMAP memblock regions
while removing others, to cater for this.Link: http://lkml.kernel.org/r/1468475036-5852-2-git-send-email-dennis.chen@arm.com
Signed-off-by: Dennis Chen
Acked-by: Steve Capper
Cc: Catalin Marinas
Cc: Ard Biesheuvel
Cc: Pekka Enberg
Cc: Mel Gorman
Cc: Tang Chen
Cc: Tony Luck
Cc: Ingo Molnar
Cc: Rafael J. Wysocki
Cc: Will Deacon
Cc: Mark Rutland
Cc: Matt Fleming
Cc: Kaly Xin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
We currently show:
task: ti: task.ti: "
"ti" and "task.ti" are redundant, and neither is actually what we want
to show, which the the base of the thread stack. Change the display to
show the stack pointer explicitly.Link: http://lkml.kernel.org/r/543ac5bd66ff94000a57a02e11af7239571a3055.1468523549.git.luto@kernel.org
Signed-off-by: Andy Lutomirski
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
We'll need this cleanup to make the cpu field in thread_info be
optional.Link: http://lkml.kernel.org/r/da298328dc77ea494576c2f20a934218e758a6fa.1468523549.git.luto@kernel.org
Signed-off-by: Andy Lutomirski
Cc: Jason Wessel
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
We should account for stacks regardless of stack size, and we need to
account in sub-page units if THREAD_SIZE < PAGE_SIZE. Change the units
to kilobytes and Move it into account_kernel_stack().Fixes: 12580e4b54ba8 ("mm: memcontrol: report kernel stack usage in cgroup2 memory.stat")
Link: http://lkml.kernel.org/r/9b5314e3ee5eda61b0317ec1563768602c1ef438.1468523549.git.luto@kernel.org
Signed-off-by: Andy Lutomirski
Cc: Vladimir Davydov
Acked-by: Johannes Weiner
Cc: Michal Hocko
Reviewed-by: Josh Poimboeuf
Reviewed-by: Vladimir Davydov
Acked-by: Michal Hocko
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Currently, NR_KERNEL_STACK tracks the number of kernel stacks in a zone.
This only makes sense if each kernel stack exists entirely in one zone,
and allowing vmapped stacks could break this assumption.Since frv has THREAD_SIZE < PAGE_SIZE, we need to track kernel stack
allocations in a unit that divides both THREAD_SIZE and PAGE_SIZE on all
architectures. Keep it simple and use KiB.Link: http://lkml.kernel.org/r/083c71e642c5fa5f1b6898902e1b2db7b48940d4.1468523549.git.luto@kernel.org
Signed-off-by: Andy Lutomirski
Cc: Vladimir Davydov
Acked-by: Johannes Weiner
Cc: Michal Hocko
Reviewed-by: Josh Poimboeuf
Reviewed-by: Vladimir Davydov
Acked-by: Michal Hocko
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Now that ZONE_DEVICE depends on SPARSEMEM_VMEMMAP we can simplify some
ifdef guards to just ZONE_DEVICE.Link: http://lkml.kernel.org/r/146687646788.39261.8020536391978771940.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams
Reported-by: Vlastimil Babka
Cc: Eric Sandeen
Cc: Jeff Moyer
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
When it was first introduced CONFIG_ZONE_DEVICE depended on disabling
CONFIG_ZONE_DMA, a configuration choice reserved for "experts".
However, now that the ZONE_DMA conflict has been eliminated it no longer
makes sense to require CONFIG_EXPERT.Link: http://lkml.kernel.org/r/146687646274.39261.14267596518720371009.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams
Reported-by: Eric Sandeen
Reported-by: Jeff Moyer
Acked-by: Jeff Moyer
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
asm-generic headers are generic implementations for architecture
specific code and should not be included by common code. Thus use the
asm/ version of sections.h to get at the linker sections.Link: http://lkml.kernel.org/r/1468285103-7470-1-git-send-email-hch@lst.de
Signed-off-by: Christoph Hellwig
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The definition of return value of madvise_free_huge_pmd is not clear
before. According to the suggestion of Minchan Kim, change the type of
return value to bool and return true if we do MADV_FREE successfully on
entire pmd page, otherwise, return false. Comments are added too.Link: http://lkml.kernel.org/r/1467135452-16688-2-git-send-email-ying.huang@intel.com
Signed-off-by: "Huang, Ying"
Acked-by: Minchan Kim
Cc: "Kirill A. Shutemov"
Cc: Jerome Marchand
Cc: Vlastimil Babka
Cc: Dan Williams
Cc: Mel Gorman
Cc: Andrea Arcangeli
Cc: Ebru Akagunduz
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Use ClearPagePrivate/ClearPagePrivate2 helpers to clear
PG_private/PG_private_2 in page->flagsLink: http://lkml.kernel.org/r/1467882338-4300-7-git-send-email-opensource.ganesh@gmail.com
Signed-off-by: Ganesh Mahendran
Acked-by: Minchan Kim
Reviewed-by: Sergey Senozhatsky
Cc: Vlastimil Babka
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add __init,__exit attribute for function that only called in module
init/exit to save memory.Link: http://lkml.kernel.org/r/1467882338-4300-6-git-send-email-opensource.ganesh@gmail.com
Signed-off-by: Ganesh Mahendran
Cc: Sergey Senozhatsky
Cc: Minchan Kim
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Some minor commebnt changes:
1). update zs_malloc(),zs_create_pool() function header
2). update "Usage of struct page fields"Link: http://lkml.kernel.org/r/1467882338-4300-5-git-send-email-opensource.ganesh@gmail.com
Signed-off-by: Ganesh Mahendran
Reviewed-by: Sergey Senozhatsky
Acked-by: Minchan Kim
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
