- 15 Dec, 2020 39 commits
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John Hubbard authored
HMM selftests are incredibly useful, but they are only effective if people actually build and run them. All the other tests in selftests/vm can be built with very standard, always-available libraries: libpthread, librt. The hmm-tests.c program, on the other hand, requires something that is (much) less readily available: libhugetlbfs. And so the build will typically fail for many developers. A simple attempt to install libhugetlbfs will also run into complications on some common distros these days: Fedora and Arch Linux (yes, Arch AUR has it, but that's fragile, as always with AUR). The library is not maintained actively enough at the moment, for distros to deal with it. I had to build it from source, for Fedora, and that didn't go too smoothly either. It turns out that, out of 21 tests in hmm-tests.c, only 2 actually require functionality from libhugetlbfs. Therefore, if libhugetlbfs is missing, simply ifdef those two tests out and allow the developer to at least have the other 19 tests, if they don't want to pause to work through the above issues. Also issue a warning, so that it's clear that there is an imperfection in the build. In order to do that, a tiny shell script (check_config.sh) runs a quick compile (not link, that's too prone to false failures with library paths), and basically, if the compiler doesn't find hugetlbfs.h in its standard locations, then the script concludes that libhugetlbfs is not available. The output is in two files, one for inclusion in hmm-test.c (local_config.h), and one for inclusion in the Makefile (local_config.mk). Link: https://lkml.kernel.org/r/20201026064021.3545418-9-jhubbard@nvidia.comSigned-off-by:
John Hubbard <jhubbard@nvidia.com> Cc: Ralph Campbell <rcampbell@nvidia.com> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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John Hubbard authored
Run benchmarks on the _fast variants of gup and pup, as originally intended. Run the new gup_test sub-test: dump pages. In addition to exercising the dump_page() call, it also demonstrates the various options you can use to specify which pages to dump, and how. Link: https://lkml.kernel.org/r/20201026064021.3545418-8-jhubbard@nvidia.comSigned-off-by:
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John Hubbard authored
For quite a while, I was doing a quick hack to gup_test.c (previously, gup_benchmark.c) whenever I wanted to try out my changes to dump_page(). This makes that hack unnecessary, and instead allows anyone to easily get the same coverage from a user space program. That saves a lot of time because you don't have to change the kernel, in order to test different pages and options. The new sub-test takes advantage of the existing gup_test infrastructure, which already provides a simple user space program, some allocated user space pages, an ioctl call, pinning of those pages (via either get_user_pages or pin_user_pages) and a corresponding kernel-side test invocation. There's not much more required, mainly just a couple of inputs from the user. In fact, the new test re-uses the existing command line options in order to get various helpful combinations (THP or normal, _fast or slow gup, gup vs. pup, and more). New command line options are: which pages to dump, and what type of "get/pin" to use. In order to figure out which pages to dump, the logic is: * If the user doesn't specify anything, the page 0 (the first page in the address range that the program sets up for testing) is dumped. * Or, the user can type up to 8 page indices anywhere on the command line. If you type more than 8, then it uses the first 8 and ignores the remaining items. For example: ./gup_test -ct -F 1 0 19 0x1000 Meaning: -c: dump pages sub-test -t: use THP pages -F 1: use pin_user_pages() instead of get_user_pages() 0 19 0x1000: dump pages 0, 19, and 4096 Link: https://lkml.kernel.org/r/20201026064021.3545418-7-jhubbard@nvidia.comSigned-off-by: -
John Hubbard authored
Therefore, some minor cleanup and improvements are in order: 1. Rename the other items appropriately. 2. Stop reporting timing information on the non-benchmark items. It's still being recorded and is available, but there's no point in cluttering up the report with data that no one reasonably needs to check. 3. Don't do iterations, for non-benchmark items. 4. Print out a shorter, more appropriate report for the non-benchmark tests. 5. Add the command that was run, to the report. This really helps, as there are quite a lot of options now. 6. Use a larger integer type for cmd, now that it's being compared Otherwise it doesn't work, because in this case cmd is about 3 billion, which is the perfect size for problems with signed vs unsigned int. Link: https://lkml.kernel.org/r/20201026064021.3545418-6-jhubbard@nvidia.comSigned-off-by:
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John Hubbard authored
A few cleanups that don't deserve separate patches, but that also should not clutter up other functional changes: 1. Remove an unnecessary #include <prctl.h> 2. Restore the sorted order of TEST_GEN_FILES. 3. Add -lpthread to the common LDLIBS, as it is harmless and several tests use it. This gets rid of one special rule already. Link: https://lkml.kernel.org/r/20201026064021.3545418-5-jhubbard@nvidia.comSigned-off-by:
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John Hubbard authored
Rename to *.sh, in order to match the conventions of all of the other items in selftest/vm. The only reason not to use a .sh suffix a shell script like this, might be to make it look more like a normal program, but that's not an issue here. Link: https://lkml.kernel.org/r/20201026064021.3545418-4-jhubbard@nvidia.comSigned-off-by:
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John Hubbard authored
Avoid the need to copy-paste the gup_test ioctl commands and the struct gup_test definition, between the kernel and the user space application, by providing a new header file for these. This allows easier and safer adding of new ioctl calls, as well as reducing the overall line count. Details: The header file has to be able to compile independently, because of the arguably unfortunate way that the Makefile is written: the Makefile tries to build all of its prerequisites, when really it should be only building the .c files, and leaving the other prerequisites (LOCAL_HDRS) as pure dependencies. That Makefile limitation is probably not worth fixing, but it explains why one of the includes had to be moved into the new header file. Also: simplify the ioctl struct (struct gup_test), by deleting the unused __expansion[10] field. This sort of thing is what you might see in a stable ABI, but this low-level, kernel-developer-oriented selftests/vm system is very much not subject to ABI stability. So "expansion" and "reserved" fields are unnecessary here. Link: https://lkml.kernel.org/r/20201026064021.3545418-3-jhubbard@nvidia.comSigned-off-by:
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John Hubbard authored
Patch series "selftests/vm: gup_test, hmm-tests, assorted improvements", v3. Summary: This series provides two main things, and a number of smaller supporting goodies. The two main points are: 1) Add a new sub-test to gup_test, which in turn is a renamed version of gup_benchmark. This sub-test allows nicer testing of dump_pages(), at least on user-space pages. For quite a while, I was doing a quick hack to gup_test.c whenever I wanted to try out changes to dump_page(). Then Matthew Wilcox asked me what I meant when I said "I used my dump_page() unit test", and I realized that it might be nice to check in a polished up version of that. Details about how it works and how to use it are in the commit description for patch #6 ("selftests/vm: gup_test: introduce the dump_pages() sub-test"). 2) Fixes a limitation of hmm-tests: these tests are incredibly useful, but only if people actually build and run them. And it turns out that libhugetlbfs is a little too effective at throwing a wrench in the works, there. So I've added a little configuration check that removes just two of the 21 hmm-tests, if libhugetlbfs is not available. Further details in the commit description of patch #8 ("selftests/vm: hmm-tests: remove the libhugetlbfs dependency"). Other smaller things that this series does: a) Remove code duplication by creating gup_test.h. b) Clear up the sub-test organization, and their invocation within run_vmtests.sh. c) Other minor assorted improvements. [1] v2 is here: https://lore.kernel.org/linux-doc/20200929212747.251804-1-jhubbard@nvidia.com/ [2] https://lore.kernel.org/r/CAHk-=wgh-TMPHLY3jueHX7Y2fWh3D+nMBqVS__AZm6-oorquWA@mail.gmail.com This patch (of 9): Rename nearly every "gup_benchmark" reference and file name to "gup_test". The one exception is for the actual gup benchmark test itself. The current code already does a *little* bit more than benchmarking, and definitely covers more than get_user_pages_fast(). More importantly, however, subsequent patches are about to add some functionality that is non-benchmark related. Closely related changes: * Kconfig: in addition to renaming the options from GUP_BENCHMARK to GUP_TEST, update the help text to reflect that it's no longer a benchmark-only test. Link: https://lkml.kernel.org/r/20201026064021.3545418-1-jhubbard@nvidia.com Link: https://lkml.kernel.org/r/20201026064021.3545418-2-jhubbard@nvidia.comSigned-off-by: -
Hailong Liu authored
The `else' is not useful after a `return' in __lock_page_or_retry(). [akpm@linux-foundation.org: coding style fixes] Link: https://lkml.kernel.org/r/20201202154720.115162-1-carver4lio@163.com Signed-off-by: Hailong Liu<liu.hailong6@zte.com.cn> Reviewed-by:
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Alex Shi authored
To fix a kernel-doc markups issue: mm/truncate.c:646: warning: Function parameter or member 'mapping' not described in 'invalidate_mapping_pagevec' mm/truncate.c:646: warning: Function parameter or member 'start' not described in 'invalidate_mapping_pagevec' mm/truncate.c:646: warning: Function parameter or member 'end' not described in 'invalidate_mapping_pagevec' mm/truncate.c:646: warning: Function parameter or member 'nr_pagevec' not described in 'invalidate_mapping_pagevec' Link: https://lkml.kernel.org/r/1605605088-30668-1-git-send-email-alex.shi@linux.alibaba.comSigned-off-by:
Alex Shi <alex.shi@linux.alibaba.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
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Kent Overstreet authored
Convert generic_file_buffered_read() to get pages to read from in batches, and then copy data to userspace from many pages at once - in particular, we now don't touch any cachelines that might be contended while we're in the loop to copy data to userspace. This is is a performance improvement on workloads that do buffered reads with large blocksizes, and a very large performance improvement if that file is also being accessed concurrently by different threads. On smaller reads (512 bytes), there's a very small performance improvement (1%, within the margin of error). akpm: kernel test robot found a 32% speedup on one test: https://lkml.kernel.org/r/20201030081456.GY31092@shao2-debian Link: https://lkml.kernel.org/r/20201025212949.602194-3-kent.overstreet@gmail.comSigned-off-by:
Kent Overstreet <kent.overstreet@gmail.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: kernel test robot <rong.a.chen@intel.com> Signed-off-by:
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Kent Overstreet authored
Patch series "generic_file_buffered_read() improvements", v2. generic_file_buffered_read() has turned into a real monstrosity to work with. And it's a major performance improvement, for both small random and large sequential reads. On my test box, 4k buffered random reads go from ~150k to ~250k iops, and the improvements to big sequential reads are even bigger. This incorporates the fix for IOCB_WAITQ handling that Jens just posted as well, also factors out lock_page_for_iocb() to improve handling of the various iocb flags. This patch (of 2): This is prep work for changing generic_file_buffered_read() to use find_get_pages_contig() to batch up all the pagecache lookups. This patch should be functionally identical to the existing code and changes as little as of the flow control as possible. More refactoring could be done, this patch is intended to be relatively minimal. Link: https://lkml.kernel.org/r/20201025212949.602194-1-kent.overstreet@gmail.com Link: https://lkml.kernel.org/r/20201025212949.602194-2-kent.overstreet@gmail.comSigned-off-by:
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Liam Mark authored
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.org Link: https://lkml.kernel.org/r/20201209125153.10533-1-georgi.djakov@linaro.orgSigned-off-by:
Liam Mark <lmark@codeaurora.org> Signed-off-by:
Georgi Djakov <georgi.djakov@linaro.org> Acked-by:
Vlastimil Babka <vbabka@suse.cz> Acked-by:
Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by:
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Zhenhua Huang authored
Page owner of pages used by page owner itself used is missing on arm32 targets. The reason is dummy_handle and failure_handle is not initialized correctly. Buddy allocator is used to initialize these two handles. However, buddy allocator is not ready when page owner calls it. This change fixed that by initializing page owner after buddy initialization. The working flow before and after this change are: original logic: 1. allocated memory for page_ext(using memblock). 2. invoke the init callback of page_ext_ops like page_owner(using buddy allocator). 3. initialize buddy. after this change: 1. allocated memory for page_ext(using memblock). 2. initialize buddy. 3. invoke the init callback of page_ext_ops like page_owner(using buddy allocator). with the change, failure/dummy_handle can get its correct value and page owner output for example has the one for page owner itself: Page allocated via order 2, mask 0x6202c0(GFP_USER|__GFP_NOWARN), pid 1006, ts 67278156558 ns PFN 543776 type Unmovable Block 531 type Unmovable Flags 0x0() init_page_owner+0x28/0x2f8 invoke_init_callbacks_flatmem+0x24/0x34 start_kernel+0x33c/0x5d8 Link: https://lkml.kernel.org/r/1603104925-5888-1-git-send-email-zhenhuah@codeaurora.orgSigned-off-by:Zhenhua Huang <zhenhuah@codeaurora.org> Acked-by:
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Dan Williams authored
Linus notes the kernel has had a nice helper for the 'size of struct with variable array member at the end' operation for a couple years now, use it. Link: http://lore.kernel.org/r/CAHk-=wgNTLbvAD8mNTvh+GQyapNWeX20PXhU_+frqEvVq4298w@mail.gmail.com Link: https://lkml.kernel.org/r/160288261564.3242821.6055291930923876456.stgit@dwillia2-desk3.amr.corp.intel.comSigned-off-by:
Dan Williams <dan.j.williams@intel.com> Reported-by:
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Bharata B Rao authored
The page order of the slab that gets chosen for a given slab cache depends on the number of objects that can be fit in the slab while meeting other requirements. We start with a value of minimum objects based on nr_cpu_ids that is driven by possible number of CPUs and hence could be higher than the actual number of CPUs present in the system. This leads to calculate_order() chosing a page order that is on the higher side leading to increased slab memory consumption on systems that have bigger page sizes. Hence rely on the number of online CPUs when determining the mininum objects, thereby increasing the chances of chosing a lower conservative page order for the slab. Vlastimil said: "Ideally, we would react to hotplug events and update existing caches accordingly. But for that, recalculation of order for existing caches would have to be made safe, while not affecting hot paths. We have removed the sysfs interface with 32a6f409 ("mm, slub: remove runtime allocation order changes") as it didn't seem easy and worth the trouble. In case somebody wants to start with a large order right from the boot because they know they will hotplug lots of cpus later, they can use slub_min_objects= boot param to override this heuristic. So in case this change regresses somebody's performance, there's a way around it and thus the risk is low IMHO" Link: https://lkml.kernel.org/r/20201118082759.1413056-1-bharata@linux.ibm.comSigned-off-by:
Bharata B Rao <bharata@linux.ibm.com> Acked-by:
Roman Gushchin <guro@fb.com> Acked-by:
David Rientjes <rientjes@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Shakeel Butt <shakeelb@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by:
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Vlastimil Babka authored
Commit 9cf7a111 ("mm/slub: make add_full() condition more explicit") replaced an unnecessarily generic kmem_cache_debug(s) check with an explicit check of SLAB_STORE_USER and #ifdef CONFIG_SLUB_DEBUG. We can achieve the same specific check with the recently added kmem_cache_debug_flags() which removes the #ifdef and restores the no-branch-overhead benefit of static key check when slub debugging is not enabled. Link: https://lkml.kernel.org/r/3ef24214-38c7-1238-8296-88caf7f48ab6@suse.czSigned-off-by:
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Alexander Popov authored
Currently in CONFIG_SLAB init_on_free happens too late, and heap objects go to the heap quarantine not being erased. Lets move init_on_free clearing before calling kasan_slab_free(). In that case heap quarantine will store erased objects, similarly to CONFIG_SLUB=y behavior. Link: https://lkml.kernel.org/r/20201210183729.1261524-1-alex.popov@linux.comSigned-off-by:
Alexander Popov <alex.popov@linux.com> Reviewed-by:
Alexander Potapenko <glider@google.com> Acked-by:
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Vlastimil Babka authored
The page allocator expects that page->mapping is NULL for a page being freed. SLAB and SLUB use the slab_cache field which is in union with mapping, but before freeing the page, the field is referenced with the "mapping" name when set to NULL. It's IMHO more correct (albeit functionally the same) to use the slab_cache name as that's the field we use in SL*B, and document why we clear it in a comment (we don't clear fields such as s_mem or freelist, as page allocator doesn't care about those). While using the 'mapping' name would automagically keep the code correct if the unions in struct page changed, such changes should be done consciously and needed changes evaluated - the comment should help with that. Link: https://lkml.kernel.org/r/20201210160020.21562-1-vbabka@suse.czSigned-off-by:
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Bartosz Golaszewski authored
Use the helper that checks for overflows internally instead of manually calculating the size of the new array. Link: https://lkml.kernel.org/r/20201109110654.12547-10-brgl@bgdev.plSigned-off-by:
Bartosz Golaszewski <bgolaszewski@baylibre.com> Acked-by:
Christian König <christian.koenig@amd.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Christoph Lameter <cl@linux.com> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: David Airlie <airlied@linux.ie> Cc: David Rientjes <rientjes@google.com> Cc: Gustavo Padovan <gustavo@padovan.org> Cc: James Morse <james.morse@arm.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Jason Wang <jasowang@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Maxime Ripard <mripard@kernel.org> Cc: "Michael S . Tsirkin" <mst@redhat.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Robert Richter <rric@kernel.org> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Takashi Iwai <tiwai@suse.com> Cc: Takashi Iwai <tiwai@suse.de> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
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Bartosz Golaszewski authored
Use the helper that checks for overflows internally instead of manually calculating the size of the new array. Link: https://lkml.kernel.org/r/20201109110654.12547-9-brgl@bgdev.plSigned-off-by:
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Bartosz Golaszewski authored
Use the helper that checks for overflows internally instead of manually calculating the size of the new array. Link: https://lkml.kernel.org/r/20201109110654.12547-8-brgl@bgdev.plSigned-off-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Christian Knig <christian.koenig@amd.com> Cc: Christoph Lameter <cl@linux.com> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: David Airlie <airlied@linux.ie> Cc: David Rientjes <rientjes@google.com> Cc: Gustavo Padovan <gustavo@padovan.org> Cc: James Morse <james.morse@arm.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Jason Wang <jasowang@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Maxime Ripard <mripard@kernel.org> Cc: "Michael S . Tsirkin" <mst@redhat.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Robert Richter <rric@kernel.org> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Takashi Iwai <tiwai@suse.com> Cc: Takashi Iwai <tiwai@suse.de> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
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Bartosz Golaszewski authored
Use the helper that checks for overflows internally instead of manually calculating the size of the new array. Link: https://lkml.kernel.org/r/20201109110654.12547-7-brgl@bgdev.plSigned-off-by:
Borislav Petkov <bp@suse.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Christian Knig <christian.koenig@amd.com> Cc: Christoph Lameter <cl@linux.com> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: David Airlie <airlied@linux.ie> Cc: David Rientjes <rientjes@google.com> Cc: Gustavo Padovan <gustavo@padovan.org> Cc: James Morse <james.morse@arm.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Jason Wang <jasowang@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Maxime Ripard <mripard@kernel.org> Cc: "Michael S . Tsirkin" <mst@redhat.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Robert Richter <rric@kernel.org> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Takashi Iwai <tiwai@suse.com> Cc: Takashi Iwai <tiwai@suse.de> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
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Bartosz Golaszewski authored
Use the helper that checks for overflows internally instead of manually calculating the size of the new array. Link: https://lkml.kernel.org/r/20201109110654.12547-6-brgl@bgdev.plSigned-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Christian Knig <christian.koenig@amd.com> Cc: Christoph Lameter <cl@linux.com> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: David Airlie <airlied@linux.ie> Cc: David Rientjes <rientjes@google.com> Cc: Gustavo Padovan <gustavo@padovan.org> Cc: James Morse <james.morse@arm.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Jason Wang <jasowang@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Maxime Ripard <mripard@kernel.org> Cc: "Michael S . Tsirkin" <mst@redhat.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Robert Richter <rric@kernel.org> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Takashi Iwai <tiwai@suse.com> Cc: Takashi Iwai <tiwai@suse.de> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
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Bartosz Golaszewski authored
Use the helper that checks for overflows internally instead of manually calculating the size of the new array. Link: https://lkml.kernel.org/r/20201109110654.12547-5-brgl@bgdev.plSigned-off-by:
Michael S. Tsirkin <mst@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Christian Knig <christian.koenig@amd.com> Cc: Christoph Lameter <cl@linux.com> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: David Airlie <airlied@linux.ie> Cc: David Rientjes <rientjes@google.com> Cc: Gustavo Padovan <gustavo@padovan.org> Cc: James Morse <james.morse@arm.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Jason Wang <jasowang@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Maxime Ripard <mripard@kernel.org> Cc: Pekka Enberg <penberg@kernel.org> Cc: Robert Richter <rric@kernel.org> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Takashi Iwai <tiwai@suse.com> Cc: Takashi Iwai <tiwai@suse.de> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
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Bartosz Golaszewski authored
Use the helper that checks for overflows internally instead of manually calculating the size of the new array. Link: https://lkml.kernel.org/r/20201109110654.12547-4-brgl@bgdev.plSigned-off-by:
Takashi Iwai <tiwai@suse.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Christian Knig <christian.koenig@amd.com> Cc: Christoph Lameter <cl@linux.com> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: David Airlie <airlied@linux.ie> Cc: David Rientjes <rientjes@google.com> Cc: Gustavo Padovan <gustavo@padovan.org> Cc: James Morse <james.morse@arm.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Jason Wang <jasowang@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Maxime Ripard <mripard@kernel.org> Cc: "Michael S . Tsirkin" <mst@redhat.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Robert Richter <rric@kernel.org> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Takashi Iwai <tiwai@suse.com> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
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Bartosz Golaszewski authored
When allocating an array of elements, users should check for multiplication overflow or preferably use one of the provided helpers like: kmalloc_array(). There's no krealloc_array() counterpart but there are many users who use regular krealloc() to reallocate arrays. Let's provide an actual krealloc_array() implementation. While at it: add some documentation regarding krealloc. Link: https://lkml.kernel.org/r/20201109110654.12547-3-brgl@bgdev.plSigned-off-by:
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Bartosz Golaszewski authored
Patch series "slab: provide and use krealloc_array()", v3. Andy brought to my attention the fact that users allocating an array of equally sized elements should check if the size multiplication doesn't overflow. This is why we have helpers like kmalloc_array(). However we don't have krealloc_array() equivalent and there are many users who do their own multiplication when calling krealloc() for arrays. This series provides krealloc_array() and uses it in a couple places. A separate series will follow adding devm_krealloc_array() which is needed in the xilinx adc driver. This patch (of 9): __GFP_ZERO is ignored by krealloc() (unless we fall-back to kmalloc() path, in which case it's honored). Point that out in the kerneldoc. Link: https://lkml.kernel.org/r/20201109110654.12547-1-brgl@bgdev.pl Link: https://lkml.kernel.org/r/20201109110654.12547-2-brgl@bgdev.plSigned-off-by:
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Hui Su authored
dump_unreclaimable_slab() acquires the slab_mutex first, and it won't remove any slab_caches list entry when itering the slab_caches lists. Thus we do not need list_for_each_entry_safe here, which is against removal of list entry. Link: https://lkml.kernel.org/r/20200926043440.GA180545@rlkSigned-off-by:
Hui Su <sh_def@163.com> 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> Signed-off-by:
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Colin Ian King authored
There are a few spelling mistakes in the Kconfig comments and help text. Fix these. Link: https://lkml.kernel.org/r/20201207155004.171962-1-colin.king@canonical.comSigned-off-by:
Colin Ian King <colin.king@canonical.com> Acked-by:
Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
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Mauricio Faria de Oliveira authored
Running stress-ng on ocfs2 completely fills the kernel log with 'max lookup times reached, filesystem may have nested directories.' Let's ratelimit this message as done with others in the code. Test-case: # mkfs.ocfs2 --mount local $DEV # mount $DEV $MNT # cd $MNT # dmesg -C # stress-ng --dirdeep 1 --dirdeep-ops 1000 # dmesg | grep -c 'max lookup times reached' Before: # dmesg -C # stress-ng --dirdeep 1 --dirdeep-ops 1000 ... stress-ng: info: [11116] successful run completed in 3.03s # dmesg | grep -c 'max lookup times reached' 967 After: # dmesg -C # stress-ng --dirdeep 1 --dirdeep-ops 1000 ... stress-ng: info: [739] successful run completed in 0.96s # dmesg | grep -c 'max lookup times reached' 10 # dmesg [ 259.086086] ocfs2_check_if_ancestor: 1990 callbacks suppressed [ 259.086092] (stress-ng-dirde,740,1):ocfs2_check_if_ancestor:1091 max lookup times reached, filesystem may have nested directories, src inode: 18007, dest inode: 17940. ... Link: https://lkml.kernel.org/r/20201001224417.478263-1-mfo@canonical.comSigned-off-by:
Mauricio Faria de Oliveira <mfo@canonical.com> Reviewed-by:
Joseph Qi <joseph.qi@linux.alibaba.com> Cc: Mark Fasheh <mark@fasheh.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Changwei Ge <gechangwei@live.cn> Cc: Gang He <ghe@suse.com> Cc: Jun Piao <piaojun@huawei.com> Signed-off-by:
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Tom Rix authored
A break is not needed if it is preceded by a goto Link: https://lkml.kernel.org/r/20201019175216.2329-1-trix@redhat.comSigned-off-by:
Tom Rix <trix@redhat.com> Acked-by:
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Alex Shi authored
This variable isn't used anymore, remove it to skip W=1 warning: fs/ntfs/inode.c:2350:6: warning: variable `attr_len' set but not used [-Wunused-but-set-variable] Link: https://lkml.kernel.org/r/4194376f-898b-b602-81c3-210567712092@linux.alibaba.comSigned-off-by:
Anton Altaparmakov <anton@tuxera.com> Signed-off-by:
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Alex Shi authored
We actually don't use these varibles, so remove them to avoid gcc warning: fs/ntfs/file.c:326:14: warning: variable `base_ni' set but not used [-Wunused-but-set-variable] fs/ntfs/logfile.c:481:21: warning: variable `log_page_mask' set but not used [-Wunused-but-set-variable] Link: https://lkml.kernel.org/r/1604821092-54631-1-git-send-email-alex.shi@linux.alibaba.comSigned-off-by:
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Sebastian Andrzej Siewior authored
In the discussion about preempt count consistency across kernel configurations: https://lore.kernel.org/r/20200914204209.256266093@linutronix.de/ it was concluded that the usage of in_interrupt() and related context checks should be removed from non-core code. Both BUG_ON()s in ide-probe.c were introduced in commit 4015c949 ("[PATCH] update ide core") when ide_unregister() was extended with semaphore based locking. Both checks won't complain about disabled preemption which is also wrong. The might_sleep() in today's mutex_lock() will complain about the missuses. Remove the BUG_ON() statements. Link: https://lkml.kernel.org/r/20201120092421.1023428-3-bigeasy@linutronix.deSigned-off-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de> Acked-by:
Jens Axboe <axboe@kernel.dk> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by:
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Sebastian Andrzej Siewior authored
falconide_get_lock() is called by ide_lock_host() and its caller (ide_issue_rq()) has already a might_sleep() check. stdma_lock() has wait_event() which also has a might_sleep() check. Remove the in_interrupt() check. Link: https://lkml.kernel.org/r/20201113161021.2217361-2-bigeasy@linutronix.deSigned-off-by:
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Petr Vorel authored
and include <linux/const.h> in UAPI headers instead of <linux/kernel.h>. The reason is to avoid indirect <linux/sysinfo.h> include when using some network headers: <linux/netlink.h> or others -> <linux/kernel.h> -> <linux/sysinfo.h>. This indirect include causes on MUSL redefinition of struct sysinfo when included both <sys/sysinfo.h> and some of UAPI headers: In file included from x86_64-buildroot-linux-musl/sysroot/usr/include/linux/kernel.h:5, from x86_64-buildroot-linux-musl/sysroot/usr/include/linux/netlink.h:5, from ../include/tst_netlink.h:14, from tst_crypto.c:13: x86_64-buildroot-linux-musl/sysroot/usr/include/linux/sysinfo.h:8:8: error: redefinition of `struct sysinfo' struct sysinfo { ^~~~~~~ In file included from ../include/tst_safe_macros.h:15, from ../include/tst_test.h:93, from tst_crypto.c:11: x86_64-buildroot-linux-musl/sysroot/usr/include/sys/sysinfo.h:10:8: note: originally defined here Link: https://lkml.kernel.org/r/20201015190013.8901-1-petr.vorel@gmail.comSigned-off-by:Petr Vorel <petr.vorel@gmail.com> Suggested-by:
Rich Felker <dalias@aerifal.cx> Acked-by:
Rich Felker <dalias@libc.org> Cc: Peter Korsgaard <peter@korsgaard.com> Cc: Baruch Siach <baruch@tkos.co.il> Cc: Florian Weimer <fweimer@redhat.com> Signed-off-by:
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Petr Mladek authored
The kthread worker API is simple. In short, it allows to create, use, and destroy workers. kthread_create_worker_on_cpu() just allows to bind a newly created worker to a given CPU. It is up to the API user how to handle CPU hotplug. They have to decide how to handle pending work items, prevent queuing new ones, and restore the functionality when the CPU goes off and on. There are few catches: + The CPU affinity gets lost when it is scheduled on an offline CPU. + The worker might not exist when the CPU was off when the user created the workers. A good practice is to implement two CPU hotplug callbacks and destroy/create the worker when CPU goes down/up. Mention this in the function description. [akpm@linux-foundation.org: grammar tweaks] Link: https://lore.kernel.org/r/20201028073031.4536-1-qiang.zhang@windriver.com Link: https://lkml.kernel.org/r/20201102101039.19227-1-pmladek@suse.comReported-by:Zhang Qiang <Qiang.Zhang@windriver.com> Signed-off-by:
Petr Mladek <pmladek@suse.com> Cc: Tejun Heo <tj@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Rob Clark authored
While migrating some code from wq to kthread_worker, I found that I missed the execute_start/end tracepoints. So add similar tracepoints for kthread_work. And for completeness, queue_work tracepoint (although this one differs slightly from the matching workqueue tracepoint). Link: https://lkml.kernel.org/r/20201010180323.126634-1-robdclark@gmail.comSigned-off-by:
Rob Clark <robdclark@chromium.org> Cc: Rob Clark <robdclark@chromium.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org> Cc: Phil Auld <pauld@redhat.com> Cc: Valentin Schneider <valentin.schneider@arm.com> Cc: Thara Gopinath <thara.gopinath@linaro.org> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Vincent Donnefort <vincent.donnefort@arm.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Jens Axboe <axboe@kernel.dk> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Frederic Weisbecker <frederic@kernel.org> Cc: Ilias Stamatis <stamatis.iliass@gmail.com> Cc: Liang Chen <cl@rock-chips.com> Cc: Ben Dooks <ben.dooks@codethink.co.uk> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: "J. Bruce Fields" <bfields@redhat.com> Signed-off-by:
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- 13 Dec, 2020 1 commit
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Linus Torvalds authored
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