07 Jan, 2021
1 commit
-
Collect the time for each allocation recorded in page owner so that
allocation "surges" can be measured.Record the pid for each allocation recorded in page owner so that the
source of allocation "surges" can be better identified.The above is very useful when doing memory analysis. On a crash for
example, we can get this information from kdump (or ramdump) and parse it
to figure out memory allocation problems.Please note that on x86_64 this increases the size of struct page_owner
from 16 bytes to 32.Vlastimil: it's not a functionality intended for production, so unless
somebody says they need to enable page_owner for debugging and this
increase prevents them from fitting into available memory, let's not
complicate things with making this optional.[lmark@codeaurora.org: v3]
Link: https://lkml.kernel.org/r/20201210160357.27779-1-georgi.djakov@linaro.orgLink: https://lkml.kernel.org/r/20201209125153.10533-1-georgi.djakov@linaro.org
Signed-off-by: Liam Mark
Signed-off-by: Georgi Djakov
Acked-by: Vlastimil Babka
Acked-by: Joonsoo Kim
Cc: Jonathan Corbet
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds(cherry picked from commit 9cc7e96aa846f9086431d6c2d33ff9ab42d72b2d)
Bug: 175129313
Signed-off-by: Suren Baghdasaryan
Change-Id: I5e246ea009c7e9e34c1cc608bcd3196fc0e623b4
24 Oct, 2020
1 commit
-
Pull documentation fixes from Jonathan Corbet:
"A handful of late-arriving documentation fixes"* tag 'docs-5.10-2' of git://git.lwn.net/linux:
docs: Add two missing entries in vm sysctl index
docs/vm: trivial fixes to several spelling mistakes
docs: submitting-patches: describe preserving review/test tags
Documentation: Chinese translation of Documentation/arm64/hugetlbpage.rst
Documentation: x86: fix a missing word in x86_64/mm.rst.
docs: driver-api: remove a duplicated index entry
docs: lkdtm: Modernize and improve details
docs: deprecated.rst: Expand str*cpy() replacement notes
docs/cpu-load: format the example code.
23 Oct, 2020
1 commit
-
Fix several spelling mistakes in vm documentation.
Signed-off-by: Colin Ian King
Link: https://lore.kernel.org/r/20201022142653.254429-1-colin.king@canonical.com
Signed-off-by: Jonathan Corbet
16 Oct, 2020
1 commit
-
Literal blocks with :: markup should be indented, as otherwise
Sphinx complains:Documentation/vm/hmm.rst:363: WARNING: Literal block expected; none found.
Fixes: f7ebd9ed7767 ("mm/doc: add usage description for migrate_vma_*()")
Signed-off-by: Mauro Carvalho Chehab
15 Oct, 2020
1 commit
-
The :c:type:`foo` only works properly with structs before
Sphinx 3.x.On Sphinx 3.x, structs should now be declared using the
.. c:struct, and referenced via :c:struct tag.As we now have the automarkup.py macro, that automatically
convert:
struct foointo cross-references, let's get rid of that, solving
several warnings when building docs with Sphinx 3.x.Reviewed-by: André Almeida # blk-mq.rst
Reviewed-by: Takashi Iwai # sound
Reviewed-by: Mike Rapoport
Reviewed-by: Greg Kroah-Hartman
Signed-off-by: Mauro Carvalho Chehab
14 Oct, 2020
1 commit
-
In the context of the anonymous address space lifespan description the
'mm_users' reference counter is confused with 'mm_count'. I.e a "zombie"
mm gets released when "mm_count" becomes zero, not "mm_users".Signed-off-by: Alexander Gordeev
Signed-off-by: Andrew Morton
Cc: Jonathan Corbet
Link: https://lkml.kernel.org/r/1597040695-32633-1-git-send-email-agordeev@linux.ibm.com
Signed-off-by: Linus Torvalds
17 Sep, 2020
1 commit
-
The migrate_vma_setup(), migrate_vma_pages(), and migrate_vma_finalize()
API usage by device drivers is not well documented.
Add a description for how device drivers are expected to use it.Signed-off-by: Ralph Campbell
Reviewed-by: Alistair Popple
Link: https://lore.kernel.org/r/20200909212956.20104-1-rcampbell@nvidia.com
Signed-off-by: Jonathan Corbet
11 Sep, 2020
1 commit
-
There were some new file additions for Kernel 5.7 and 5.8
that weren't added at the corresponding index file.Signed-off-by: Mauro Carvalho Chehab
Link: https://lore.kernel.org/r/9fd4d04f0d122ff38b5342a0098d99cc2f546652.1599660067.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet
10 Sep, 2020
1 commit
-
Add Sphinx reference links to HMM and CPUSETS, and numerous small
editorial changes to make the page_migration.rst document more readable.Signed-off-by: Ralph Campbell
Reviewed-by: Randy Dunlap
Link: https://lore.kernel.org/r/20200902225247.15213-1-rcampbell@nvidia.com
Signed-off-by: Jonathan Corbet
13 Aug, 2020
1 commit
-
Add following new vmstat events which will help in validating THP
migration without split. Statistics reported through these new VM events
will help in performance debugging.1. THP_MIGRATION_SUCCESS
2. THP_MIGRATION_FAILURE
3. THP_MIGRATION_SPLITIn addition, these new events also update normal page migration statistics
appropriately via PGMIGRATE_SUCCESS and PGMIGRATE_FAILURE. While here,
this updates current trace event 'mm_migrate_pages' to accommodate now
available THP statistics.[akpm@linux-foundation.org: s/hpage_nr_pages/thp_nr_pages/]
[ziy@nvidia.com: v2]
Link: http://lkml.kernel.org/r/C5E3C65C-8253-4638-9D3C-71A61858BB8B@nvidia.com
[anshuman.khandual@arm.com: s/thp_nr_pages/hpage_nr_pages/]
Link: http://lkml.kernel.org/r/1594287583-16568-1-git-send-email-anshuman.khandual@arm.comSigned-off-by: Anshuman Khandual
Signed-off-by: Zi Yan
Signed-off-by: Andrew Morton
Reviewed-by: Daniel Jordan
Cc: Hugh Dickins
Cc: Matthew Wilcox
Cc: Zi Yan
Cc: John Hubbard
Cc: Naoya Horiguchi
Link: http://lkml.kernel.org/r/1594080415-27924-1-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Linus Torvalds
08 Aug, 2020
6 commits
-
After removal of CONFIG_HAVE_MEMBLOCK_NODE_MAP we have two equivalent
functions that call memory_present() for each region in memblock.memory:
sparse_memory_present_with_active_regions() and membocks_present().Moreover, all architectures have a call to either of these functions
preceding the call to sparse_init() and in the most cases they are called
one after the other.Mark the regions from memblock.memory as present during sparce_init() by
making sparse_init() call memblocks_present(), make memblocks_present()
and memory_present() functions static and remove redundant
sparse_memory_present_with_active_regions() function.Also remove no longer required HAVE_MEMORY_PRESENT configuration option.
Signed-off-by: Mike Rapoport
Signed-off-by: Andrew Morton
Link: http://lkml.kernel.org/r/20200712083130.22919-1-rppt@kernel.org
Signed-off-by: Linus Torvalds -
There are many instances where vmemap allocation is often switched between
regular memory and device memory just based on whether altmap is available
or not. vmemmap_alloc_block_buf() is used in various platforms to
allocate vmemmap mappings. Lets also enable it to handle altmap based
device memory allocation along with existing regular memory allocations.
This will help in avoiding the altmap based allocation switch in many
places. To summarize there are two different methods to call
vmemmap_alloc_block_buf().vmemmap_alloc_block_buf(size, node, NULL) /* Allocate from system RAM */
vmemmap_alloc_block_buf(size, node, altmap) /* Allocate from altmap */This converts altmap_alloc_block_buf() into a static function, drops it's
entry from the header and updates Documentation/vm/memory-model.rst.Suggested-by: Robin Murphy
Signed-off-by: Anshuman Khandual
Signed-off-by: Andrew Morton
Tested-by: Jia He
Reviewed-by: Catalin Marinas
Cc: Jonathan Corbet
Cc: Will Deacon
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: Dave Hansen
Cc: Andy Lutomirski
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Borislav Petkov
Cc: "H. Peter Anvin"
Cc: Dan Williams
Cc: David Hildenbrand
Cc: Fenghua Yu
Cc: Hsin-Yi Wang
Cc: "Kirill A. Shutemov"
Cc: Mark Rutland
Cc: "Matthew Wilcox (Oracle)"
Cc: Michal Hocko
Cc: Mike Rapoport
Cc: Palmer Dabbelt
Cc: Paul Walmsley
Cc: Pavel Tatashin
Cc: Steve Capper
Cc: Tony Luck
Cc: Yu Zhao
Link: http://lkml.kernel.org/r/1594004178-8861-3-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Linus Torvalds -
This adds a specific description file for all arch page table helpers which
is in sync with the semantics being tested via CONFIG_DEBUG_VM_PGTABLE. All
future changes either to these descriptions here or the debug test should
always remain in sync.[anshuman.khandual@arm.com: fold in Mike's patch for the rst document, fix typos in the rst document]
Link: http://lkml.kernel.org/r/1594610587-4172-5-git-send-email-anshuman.khandual@arm.comSuggested-by: Mike Rapoport
Signed-off-by: Anshuman Khandual
Signed-off-by: Andrew Morton
Acked-by: Mike Rapoport
Cc: Jonathan Corbet
Cc: Mike Rapoport
Cc: Vineet Gupta
Cc: Catalin Marinas
Cc: Will Deacon
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: Heiko Carstens
Cc: Vasily Gorbik
Cc: Christian Borntraeger
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Borislav Petkov
Cc: "H. Peter Anvin"
Cc: Kirill A. Shutemov
Cc: Paul Walmsley
Cc: Palmer Dabbelt
Cc: Zi Yan
Link: http://lkml.kernel.org/r/1593996516-7186-5-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Linus Torvalds -
SLUB_DEBUG creates several files under /sys/kernel/slab// that can
be read to check if the respective debugging options are enabled for given
cache. Some options, namely sanity_checks, trace, and failslab can be
also enabled and disabled at runtime by writing into the files.The runtime toggling is racy. Some options disable __CMPXCHG_DOUBLE when
enabled, which means that in case of concurrent allocations, some can
still use __CMPXCHG_DOUBLE and some not, leading to potential corruption.
The s->flags field is also not updated or checked atomically. The
simplest solution is to remove the runtime toggling. The extended
slub_debug boot parameter syntax introduced by earlier patch should allow
to fine-tune the debugging configuration during boot with same
granularity.Signed-off-by: Vlastimil Babka
Signed-off-by: Andrew Morton
Reviewed-by: Kees Cook
Acked-by: Roman Gushchin
Cc: Christoph Lameter
Cc: Jann Horn
Cc: Vijayanand Jitta
Cc: David Rientjes
Cc: Joonsoo Kim
Cc: Pekka Enberg
Link: http://lkml.kernel.org/r/20200610163135.17364-5-vbabka@suse.cz
Signed-off-by: Linus Torvalds -
SLUB_DEBUG creates several files under /sys/kernel/slab// that can
be read to check if the respective debugging options are enabled for given
cache. The options can be also toggled at runtime by writing into the
files. Some of those, namely red_zone, poison, and store_user can be
toggled only when no objects yet exist in the cache.Vijayanand reports [1] that there is a problem with freelist randomization
if changing the debugging option's state results in different number of
objects per page, and the random sequence cache needs thus needs to be
recomputed.However, another problem is that the check for "no objects yet exist in
the cache" is racy, as noted by Jann [2] and fixing that would add
overhead or otherwise complicate the allocation/freeing paths. Thus it
would be much simpler just to remove the runtime toggling support. The
documentation describes it's "In case you forgot to enable debugging on
the kernel command line", but the neccessity of having no objects limits
its usefulness anyway for many caches.Vijayanand describes an use case [3] where debugging is enabled for all
but zram caches for memory overhead reasons, and using the runtime toggles
was the only way to achieve such configuration. After the previous patch
it's now possible to do that directly from the kernel boot option, so we
can remove the dangerous runtime toggles by making the /sys attribute
files read-only.While updating it, also improve the documentation of the debugging /sys files.
[1] https://lkml.kernel.org/r/1580379523-32272-1-git-send-email-vjitta@codeaurora.org
[2] https://lore.kernel.org/r/CAG48ez31PP--h6_FzVyfJ4H86QYczAFPdxtJHUEEan+7VJETAQ@mail.gmail.com
[3] https://lore.kernel.org/r/1383cd32-1ddc-4dac-b5f8-9c42282fa81c@codeaurora.orgReported-by: Vijayanand Jitta
Reported-by: Jann Horn
Signed-off-by: Vlastimil Babka
Signed-off-by: Andrew Morton
Reviewed-by: Kees Cook
Acked-by: Roman Gushchin
Cc: Christoph Lameter
Cc: David Rientjes
Cc: Joonsoo Kim
Cc: Pekka Enberg
Link: http://lkml.kernel.org/r/20200610163135.17364-3-vbabka@suse.cz
Signed-off-by: Linus Torvalds -
Patch series "slub_debug fixes and improvements".
The slub_debug kernel boot parameter can either apply a single set of
options to all caches or a list of caches. There is a use case where
debugging is applied for all caches and then disabled at runtime for
specific caches, for performance and memory consumption reasons [1]. As
runtime changes are dangerous, extend the boot parameter syntax so that
multiple blocks of either global or slab-specific options can be
specified, with blocks delimited by ';'. This will also support the use
case of [1] without runtime changes.For details see the updated Documentation/vm/slub.rst
[1] https://lore.kernel.org/r/1383cd32-1ddc-4dac-b5f8-9c42282fa81c@codeaurora.org
[weiyongjun1@huawei.com: make parse_slub_debug_flags() static]
Link: http://lkml.kernel.org/r/20200702150522.4940-1-weiyongjun1@huawei.comSigned-off-by: Vlastimil Babka
Signed-off-by: Andrew Morton
Reviewed-by: Kees Cook
Cc: Vlastimil Babka
Cc: Christoph Lameter
Cc: Jann Horn
Cc: Roman Gushchin
Cc: Vijayanand Jitta
Cc: Pekka Enberg
Cc: David Rientjes
Cc: Joonsoo Kim
Link: http://lkml.kernel.org/r/20200610163135.17364-2-vbabka@suse.cz
Signed-off-by: Linus Torvalds
13 Jul, 2020
1 commit
-
Drop the doubled word "the".
Signed-off-by: Randy Dunlap
Reviewed-by: Mike Rapoport
Cc: Jonathan Corbet
Cc: linux-doc@vger.kernel.org
Cc: Andrew Morton
Cc: linux-mm@kvack.org
Link: https://lore.kernel.org/r/20200707180414.10467-20-rdunlap@infradead.org
Signed-off-by: Jonathan Corbet
11 Jun, 2020
1 commit
-
Pull more documentation updates from Jonathan Corbet:
"A handful of late-arriving docs fixes, along with a patch changing a
lot of HTTP links to HTTPS that had to be yanked and redone before the
first pull"* tag 'docs-5.8-2' of git://git.lwn.net/linux:
docs/memory-barriers.txt/kokr: smp_mb__{before,after}_atomic(): update Documentation
Documentation: devres: add missing entry for devm_platform_get_and_ioremap_resource()
Replace HTTP links with HTTPS ones: documentation
docs: it_IT: address invalid reference warnings
doc: zh_CN: use doc reference to resolve undefined label warning
docs: Update the location of the LF NDA program
docs: dev-tools: coccinelle: underlines
10 Jun, 2020
2 commits
-
Convert comments that reference mmap_sem to reference mmap_lock instead.
[akpm@linux-foundation.org: fix up linux-next leftovers]
[akpm@linux-foundation.org: s/lockaphore/lock/, per Vlastimil]
[akpm@linux-foundation.org: more linux-next fixups, per Michel]Signed-off-by: Michel Lespinasse
Signed-off-by: Andrew Morton
Reviewed-by: Vlastimil Babka
Reviewed-by: Daniel Jordan
Cc: Davidlohr Bueso
Cc: David Rientjes
Cc: Hugh Dickins
Cc: Jason Gunthorpe
Cc: Jerome Glisse
Cc: John Hubbard
Cc: Laurent Dufour
Cc: Liam Howlett
Cc: Matthew Wilcox
Cc: Peter Zijlstra
Cc: Ying Han
Link: http://lkml.kernel.org/r/20200520052908.204642-13-walken@google.com
Signed-off-by: Linus Torvalds -
Convert comments that reference old mmap_sem APIs to reference
corresponding new mmap locking APIs instead.Signed-off-by: Michel Lespinasse
Signed-off-by: Andrew Morton
Reviewed-by: Vlastimil Babka
Reviewed-by: Davidlohr Bueso
Reviewed-by: Daniel Jordan
Cc: David Rientjes
Cc: Hugh Dickins
Cc: Jason Gunthorpe
Cc: Jerome Glisse
Cc: John Hubbard
Cc: Laurent Dufour
Cc: Liam Howlett
Cc: Matthew Wilcox
Cc: Peter Zijlstra
Cc: Ying Han
Link: http://lkml.kernel.org/r/20200520052908.204642-12-walken@google.com
Signed-off-by: Linus Torvalds
08 Jun, 2020
1 commit
-
Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.Deterministic algorithm:
For each file:
For each line:
If doesn't contain `\bxmlns\b`:
For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
If both the HTTP and HTTPS versions
return 200 OK and serve the same content:
Replace HTTP with HTTPS.Signed-off-by: Alexander A. Klimov
Link: https://lore.kernel.org/r/20200526060544.25127-1-grandmaster@al2klimov.de
Signed-off-by: Jonathan Corbet
04 Jun, 2020
2 commits
-
To see a sorted result from page_owner, there must be a tiresome
preprocessing step before running page_owner_sort. This patch simply
filters out lines which start with "PFN" while reading the page owner
report.Signed-off-by: Changhee Han
Signed-off-by: Andrew Morton
Reviewed-by: Andrew Morton
Cc: Vlastimil Babka
Cc: Joonsoo Kim
Cc: Jonathan Corbet
Link: http://lkml.kernel.org/r/20200429052940.16968-1-ch0.han@lge.com
Signed-off-by: Linus Torvalds -
To reflect the updates to free_area_init() family of functions.
Signed-off-by: Mike Rapoport
Signed-off-by: Andrew Morton
Tested-by: Hoan Tran [arm64]
Cc: Baoquan He
Cc: Brian Cain
Cc: Catalin Marinas
Cc: "David S. Miller"
Cc: Geert Uytterhoeven
Cc: Greentime Hu
Cc: Greg Ungerer
Cc: Guan Xuetao
Cc: Guo Ren
Cc: Heiko Carstens
Cc: Helge Deller
Cc: "James E.J. Bottomley"
Cc: Jonathan Corbet
Cc: Ley Foon Tan
Cc: Mark Salter
Cc: Matt Turner
Cc: Max Filippov
Cc: Michael Ellerman
Cc: Michal Hocko
Cc: Michal Simek
Cc: Nick Hu
Cc: Paul Walmsley
Cc: Richard Weinberger
Cc: Rich Felker
Cc: Russell King
Cc: Stafford Horne
Cc: Thomas Bogendoerfer
Cc: Tony Luck
Cc: Vineet Gupta
Cc: Yoshinori Sato
Link: http://lkml.kernel.org/r/20200412194859.12663-22-rppt@kernel.org
Signed-off-by: Linus Torvalds
03 Jun, 2020
3 commits
-
Pull hmm updates from Jason Gunthorpe:
"This series adds a selftest for hmm_range_fault() and several of the
DEVICE_PRIVATE migration related actions, and another simplification
for hmm_range_fault()'s API.- Simplify hmm_range_fault() with a simpler return code, no
HMM_PFN_SPECIAL, and no customizable output PFN format- Add a selftest for hmm_range_fault() and DEVICE_PRIVATE related
functionality"* tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
MAINTAINERS: add HMM selftests
mm/hmm/test: add selftests for HMM
mm/hmm/test: add selftest driver for HMM
mm/hmm: remove the customizable pfn format from hmm_range_fault
mm/hmm: remove HMM_PFN_SPECIAL
drm/amdgpu: remove dead code after hmm_range_fault()
mm/hmm: make hmm_range_fault return 0 or -1 -
Merge updates from Andrew Morton:
"A few little subsystems and a start of a lot of MM patches.Subsystems affected by this patch series: squashfs, ocfs2, parisc,
vfs. With mm subsystems: slab-generic, slub, debug, pagecache, gup,
swap, memcg, pagemap, memory-failure, vmalloc, kasan"* emailed patches from Andrew Morton : (128 commits)
kasan: move kasan_report() into report.c
mm/mm_init.c: report kasan-tag information stored in page->flags
ubsan: entirely disable alignment checks under UBSAN_TRAP
kasan: fix clang compilation warning due to stack protector
x86/mm: remove vmalloc faulting
mm: remove vmalloc_sync_(un)mappings()
x86/mm/32: implement arch_sync_kernel_mappings()
x86/mm/64: implement arch_sync_kernel_mappings()
mm/ioremap: track which page-table levels were modified
mm/vmalloc: track which page-table levels were modified
mm: add functions to track page directory modifications
s390: use __vmalloc_node in stack_alloc
powerpc: use __vmalloc_node in alloc_vm_stack
arm64: use __vmalloc_node in arch_alloc_vmap_stack
mm: remove vmalloc_user_node_flags
mm: switch the test_vmalloc module to use __vmalloc_node
mm: remove __vmalloc_node_flags_caller
mm: remove both instances of __vmalloc_node_flags
mm: remove the prot argument to __vmalloc_node
mm: remove the pgprot argument to __vmalloc
... -
"toggle" means to change a boolean thing's state. This operation
doesn't do that - it sets it to "true".Signed-off-by: Andrew Morton
Acked-by: Rafael Aquini
Cc: Christoph Lameter
Cc: David Rientjes
Cc: Joonsoo Kim
Cc: Pekka Enberg
Signed-off-by: Linus Torvalds
01 Jun, 2020
1 commit
-
Recently, I switched over from swap-file to zramswap.
When reading the Documentation/vm/zswap.rst file I fell over this typo.
The parameter is called accept_threshold_percent not accept_threhsold_percent
in /sys/module/zswap/parameters/ directory.Fixes: 45190f01dd402 ("mm/zswap.c: add allocation hysteresis if pool limit is hit")
Cc: Vitaly Wool
Signed-off-by: Sedat Dilek
Link: https://lore.kernel.org/r/20200601005911.31222-1-sedat.dilek@gmail.com
Signed-off-by: Jonathan Corbet
16 May, 2020
1 commit
-
The __netdev_alloc_frag() has been dropped by commit 7ba7aeabbaba ("net:
Don't disable interrupts in napi_alloc_frag()"). So replace it with
netdev_alloc_frag().Signed-off-by: Kevin Hao
Link: https://lore.kernel.org/r/20200508140924.18220-1-haokexin@gmail.com
Signed-off-by: Jonathan Corbet
11 May, 2020
2 commits
-
Presumably the intent here was that hmm_range_fault() could put the data
into some HW specific format and thus avoid some work. However, nothing
actually does that, and it isn't clear how anything actually could do that
as hmm_range_fault() provides CPU addresses which must be DMA mapped.Perhaps there is some special HW that does not need DMA mapping, but we
don't have any examples of this, and the theoretical performance win of
avoiding an extra scan over the pfns array doesn't seem worth the
complexity. Plus pfns needs to be scanned anyhow to sort out any
DEVICE_PRIVATE pages.This version replaces the uint64_t with an usigned long containing a pfn
and fixed flags. On input flags is filled with the HMM_PFN_REQ_* values,
on successful output it is filled with HMM_PFN_* values, describing the
state of the pages.amdgpu is simple to convert, it doesn't use snapshot and doesn't use
per-page flags.nouveau uses only 16 hmm_pte entries at most (ie fits in a few cache
lines), and it sweeps over its pfns array a couple of times anyhow. It
also has a nasty call chain before it reaches the dma map and hardware
suggesting performance isn't important:nouveau_svm_fault():
args.i.m.method = NVIF_VMM_V0_PFNMAP
nouveau_range_fault()
nvif_object_ioctl()
client->driver->ioctl()
struct nvif_driver nvif_driver_nvkm:
.ioctl = nvkm_client_ioctl
nvkm_ioctl()
nvkm_ioctl_path()
nvkm_ioctl_v0[type].func(..)
nvkm_ioctl_mthd()
nvkm_object_mthd()
struct nvkm_object_func nvkm_uvmm:
.mthd = nvkm_uvmm_mthd
nvkm_uvmm_mthd()
nvkm_uvmm_mthd_pfnmap()
nvkm_vmm_pfn_map()
nvkm_vmm_ptes_get_map()
func == gp100_vmm_pgt_pfn
struct nvkm_vmm_desc_func gp100_vmm_desc_spt:
.pfn = gp100_vmm_pgt_pfn
nvkm_vmm_iter()
REF_PTES == func == gp100_vmm_pgt_pfn()
dma_map_page()Link: https://lore.kernel.org/r/5-v2-b4e84f444c7d+24f57-hmm_no_flags_jgg@mellanox.com
Acked-by: Felix Kuehling
Tested-by: Ralph Campbell
Signed-off-by: Christoph Hellwig
Reviewed-by: Christoph Hellwig
Signed-off-by: Jason Gunthorpe -
hmm_vma_walk->last is supposed to be updated after every write to the
pfns, so that it can be returned by hmm_range_fault(). However, this is
not done consistently. Fortunately nothing checks the return code of
hmm_range_fault() for anything other than error.More importantly last must be set before returning -EBUSY as it is used to
prevent reading an output pfn as an input flags when the loop restarts.For clarity and simplicity make hmm_range_fault() return 0 or -ERRNO. Only
set last when returning -EBUSY.Link: https://lore.kernel.org/r/2-v2-b4e84f444c7d+24f57-hmm_no_flags_jgg@mellanox.com
Acked-by: Felix Kuehling
Tested-by: Ralph Campbell
Reviewed-by: Christoph Hellwig
Signed-off-by: Jason Gunthorpe
21 Apr, 2020
1 commit
-
The new free_page_reporting.rst file is not listed at the index.
Signed-off-by: Mauro Carvalho Chehab
Link: https://lore.kernel.org/r/146432ae6965a2bb62c929a6b62f9d4010986622.1586881715.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet
08 Apr, 2020
2 commits
-
The compressed cache for swap pages (zswap) currently needs from 1 to 3
extra kernel command line parameters in order to make it work: it has to
be enabled by adding a "zswap.enabled=1" command line parameter and if one
wants a different compressor or pool allocator than the default lzo / zbud
combination then these choices also need to be specified on the kernel
command line in additional parameters.Using a different compressor and allocator for zswap is actually pretty
common as guides often recommend using the lz4 / z3fold pair instead of
the default one. In such case it is also necessary to remember to enable
the appropriate compression algorithm and pool allocator in the kernel
config manually.Let's avoid the need for adding these kernel command line parameters and
automatically pull in the dependencies for the selected compressor
algorithm and pool allocator by adding an appropriate default switches to
Kconfig.The default values for these options match what the code was using
previously as its defaults.Signed-off-by: Maciej S. Szmigiero
Signed-off-by: Andrew Morton
Reviewed-by: Vitaly Wool
Link: http://lkml.kernel.org/r/20200202000112.456103-1-mail@maciej.szmigiero.name
Signed-off-by: Linus Torvalds -
Add documentation for free page reporting. Currently the only consumer is
virtio-balloon, however it is possible that other drivers might make use
of this so it is best to add a bit of documetation explaining at a high
level how to use the API.Signed-off-by: Alexander Duyck
Signed-off-by: Andrew Morton
Cc: Andrea Arcangeli
Cc: Dan Williams
Cc: Dave Hansen
Cc: David Hildenbrand
Cc: Konrad Rzeszutek Wilk
Cc: Luiz Capitulino
Cc: Matthew Wilcox
Cc: Mel Gorman
Cc: Michael S. Tsirkin
Cc: Michal Hocko
Cc: Nitesh Narayan Lal
Cc: Oscar Salvador
Cc: Pankaj Gupta
Cc: Paolo Bonzini
Cc: Rik van Riel
Cc: Vlastimil Babka
Cc: Wei Wang
Cc: Yang Zhang
Cc: wei qi
Link: http://lkml.kernel.org/r/20200211224730.29318.43815.stgit@localhost.localdomain
Signed-off-by: Linus Torvalds
04 Apr, 2020
1 commit
-
Pull SPDX updates from Greg KH:
"Here are three SPDX patches for 5.7-rc1.One fixes up the SPDX tag for a single driver, while the other two go
through the tree and add SPDX tags for all of the .gitignore files as
needed.Nothing too complex, but you will get a merge conflict with your
current tree, that should be trivial to handle (one file modified by
two things, one file deleted.)All three of these have been in linux-next for a while, with no
reported issues other than the merge conflict"* tag 'spdx-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/spdx:
ASoC: MT6660: make spdxcheck.py happy
.gitignore: add SPDX License Identifier
.gitignore: remove too obvious comments
28 Mar, 2020
1 commit
-
Now that flags are handled on a fine-grained per-page basis this global
flag is redundant and has a confusing overlap with the pfn_flags_mask and
default_flags.Normalize the HMM_FAULT_SNAPSHOT behavior into one place. Callers needing
the SNAPSHOT behavior should set a pfn_flags_mask and default_flags that
always results in a cleared HMM_PFN_VALID. Then no pages will be faulted,
and HMM_FAULT_SNAPSHOT is not a special flow that overrides the masking
mechanism.As this is the last flag, also remove the flags argument. If future flags
are needed they can be part of the struct hmm_range function arguments.Link: https://lore.kernel.org/r/20200327200021.29372-5-jgg@ziepe.ca
Reviewed-by: Christoph Hellwig
Signed-off-by: Jason Gunthorpe
25 Mar, 2020
1 commit
-
Add SPDX License Identifier to all .gitignore files.
Signed-off-by: Masahiro Yamada
Signed-off-by: Greg Kroah-Hartman
01 Feb, 2020
1 commit
-
zswap will always try to shrink pool when zswap is full. If there is a
high pressure on zswap it will result in flipping pages in and out zswap
pool without any real benefit, and the overall system performance will
drop. The previous discussion on this subject [1] ended up with a
suggestion to implement a sort of hysteresis to refuse taking pages into
zswap pool until it has sufficient space if the limit has been hit.
This is my take on this.Hysteresis is controlled with a sysfs-configurable parameter (namely,
/sys/kernel/debug/zswap/accept_threhsold_percent). It specifies the
threshold at which zswap would start accepting pages again after it
became full. Setting this parameter to 100 disables the hysteresis and
sets the zswap behavior to pre-hysteresis state.[1] https://lkml.org/lkml/2019/11/8/949
Link: http://lkml.kernel.org/r/20200108200118.15563-1-vitaly.wool@konsulko.com
Signed-off-by: Vitaly Wool
Cc: Dan Streetman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
14 Jan, 2020
1 commit
-
The 'interval_sub' is placed on the 'notifier_subscriptions' interval
tree.This eliminates the poor name 'mni' for this variable.
Signed-off-by: Jason Gunthorpe
24 Nov, 2019
1 commit
-
The only two users of this are now converted to use mmu_interval_notifier,
delete all the code and update hmm.rst.Link: https://lore.kernel.org/r/20191112202231.3856-14-jgg@ziepe.ca
Reviewed-by: Jérôme Glisse
Tested-by: Ralph Campbell
Reviewed-by: Christoph Hellwig
Signed-off-by: Jason Gunthorpe
27 Sep, 2019
1 commit
-
The naming of pgtable_page_{ctor,dtor}() seems to have confused a few
people, and until recently arm64 used these erroneously/pointlessly for
other levels of page table.To make it incredibly clear that these only apply to the PTE level, and to
align with the naming of pgtable_pmd_page_{ctor,dtor}(), let's rename them
to pgtable_pte_page_{ctor,dtor}().These changes were generated with the following shell script:
----
git grep -lw 'pgtable_page_.tor' | while read FILE; do
sed -i '{s/pgtable_page_ctor/pgtable_pte_page_ctor/}' $FILE;
sed -i '{s/pgtable_page_dtor/pgtable_pte_page_dtor/}' $FILE;
done
----... with the documentation re-flowed to remain under 80 columns, and
whitespace fixed up in macros to keep backslashes aligned.There should be no functional change as a result of this patch.
Link: http://lkml.kernel.org/r/20190722141133.3116-1-mark.rutland@arm.com
Signed-off-by: Mark Rutland
Reviewed-by: Mike Rapoport
Acked-by: Geert Uytterhoeven [m68k]
Cc: Anshuman Khandual
Cc: Matthew Wilcox
Cc: Michal Hocko
Cc: Yu Zhao
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
