- 11 Dec, 2018 1 commit
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Reinette Chatre authored
rdt_find_domain() returns an ERR_PTR() that is generated from a provided domain id when the value is negative. Care needs to be taken when creating an ERR_PTR() from this value because a subsequent check using IS_ERR() expects the error to be within the MAX_ERRNO range. Using an invalid domain id as an ERR_PTR() does work at this time since this is currently always -1. Using this undocumented assumption is fragile since future users of rdt_find_domain() may not be aware of thus assumption. Two related issues are addressed: - Ensure that rdt_find_domain() always returns a valid error value by forcing the error to be -ENODEV when a negative domain id is provided. - In a few instances the return value of rdt_find_domain() is just checked for NULL - fix these to include a check of ERR_PTR. Fixes: d89b7379 ("x86/intel_rdt/cqm: Add mon_data") Fixes: 521348b0 ("x86/intel_rdt: Introduce utility to obtain CDP peer") Signed-off-by:
Reinette Chatre <reinette.chatre@intel.com> Signed-off-by:
Borislav Petkov <bp@suse.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: fenghua.yu@intel.com Cc: gavin.hindman@intel.com Cc: jithu.joseph@intel.com Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/b88cd4ff6a75995bf8db9b0ea546908fe50f69f3.1544479852.git.reinette.chatre@intel.com
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- 29 Nov, 2018 1 commit
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Babu Moger authored
The Smatch static checker reports the following error after commit: a36c5ff5 ("x86/resctrl: Bring cbm_validate() into the resource structure"): arch/x86/kernel/cpu/resctrl/ctrlmondata.c:227 parse_cbm() error: uninitialized symbol 'cbm_val'. arch/x86/kernel/cpu/resctrl/ctrlmondata.c:236 parse_cbm() error: uninitialized symbol 'cbm_val'. This could happen if ->cbm_validate() is NULL which could leave cbm_val uninitialized. However, there is no case where ->cbm_validate() can be NULL as it is initialized based on a vendor check. So it is either an Intel or an AMD version it points to. And in both the cases it is initialized properly. Thus, remove the first check. Verified the fix running Smatch. [ bp: massage commit message. ] Fixes: a36c5ff5 ("x86/resctrl: Bring cbm_validate() into the resource structure") Reported-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
Babu Moger <babu.moger@amd.com> Signed-off-by:
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- 27 Nov, 2018 1 commit
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Reinette Chatre authored
The last_cmd_status sequence buffer contains user-visible messages (accessed via /sys/fs/resctrl/info/last_cmd_status) that detail any errors encountered while interacting with the resctrl filesystem. rdt_last_cmd_printf() and rdt_last_cmd_puts() are the two calls available to respectively print a string with format specifiers or a simple one (which contains no format specifiers) to the last_cmd_status buffer. A few occurrences exist where rdt_last_cmd_printf() is used to print a simple string. Doing so does not result in incorrect result or incorrect behavior, but rdt_last_cmd_puts() is the function intended to be used in these cases, as it is faster and it doesn't need to do the vsnprintf() formatting. Fix these occurrences to use rdt_last_cmd_puts() instead. While doing so, fix two typos that were recently introduced into two of these simple strings. [ bp: massage commit message and correct typos. ] Fixes: 723f1a0d ("x86/resctrl: Fixup the user-visible strings") Fixes: e0bdfe8e ("x86/intel_rdt: Support creation/removal of pseudo-locked region") Fixes: 9ab9aa15 ("x86/intel_rdt: Ensure requested schemata respects mode") Fixes: d48d7a57 ("x86/intel_rdt: Introduce resource group's mode resctrl file") Fixes: dfe9674b ("x86/intel_rdt: Enable entering of pseudo-locksetup mode") Signed-off-by:
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- 22 Nov, 2018 13 commits
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Babu Moger authored
The file nameswith intel_rdt* have been moved to the new directory arch/x86/kernel/cpu/resctrl/. Update to reflect the changed files and documentation. Signed-off-by:
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Babu Moger authored
Rename intel_rdt_ui.txt to generic resctrl_ui.txt and update the documentation for AMD. Signed-off-by:
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Babu Moger authored
Enable QOS feature on AMD. Following QoS sub-features are supported on AMD if the underlying hardware supports it: - L3 Cache allocation enforcement - L3 Cache occupancy monitoring - L3 Code-Data Prioritization support - Memory Bandwidth Enforcement (Allocation) The specification is available at: https://developer.amd.com/wp-content/resources/56375.pdf There are differences in the way some of the features are implemented. Separate those functions and add those as vendor specific functions. The major difference is in MBA feature: - AMD uses CPUID leaf 0x80000020 to initialize the MBA features. - AMD uses direct bandwidth value instead of delay based on bandwidth values. - MSR register base addresses are different for MBA. - AMD allows non-contiguous L3 cache bit masks. Signed-off-by:
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Babu Moger authored
Fix the messages in rdt_last_cmd_printf() and rdt_last_cmd_puts() to make them more meaningful and consistent. [ bp: s/cpu/CPU/; s/mem\W/memory ] Signed-off-by:
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Sherry Hurwitz authored
The feature bit X86_FEATURE_MBA is detected via CPUID leaf 0x80000008 EBX Bit 06. This bit indicates the support of AMD's MBA feature. This feature is supported by both Intel and AMD. But they are detected in different CPUID leaves. [ bp: s/cpuid/CPUID/g ] Signed-off-by:
Sherry Hurwitz <sherry.hurwitz@amd.com> Signed-off-by:
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Babu Moger authored
The resource control feature is supported by both Intel and AMD. So, rename CONFIG_INTEL_RDT to the vendor-neutral CONFIG_RESCTRL. Now CONFIG_RESCTRL will be used for both Intel and AMD to enable Resource Control support. Update the texts in config and condition accordingly. [ bp: Simplify Kconfig text. ] Signed-off-by:
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Babu Moger authored
MBA software controller support is available only on Intel. Suggested-by:
Fenghua Yu <fenghua.yu@intel.com> Signed-off-by:
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Babu Moger authored
Bring all the functions that are different between the vendors into the resource structure and initialize them dynamically. Add _intel suffix to the Intel-specific functions. cbm_validate() which does cache bitmask validation, differs between the vendors as AMD allows non-contiguous masks. So, use separate functions for Intel and AMD. [ bp: Massage commit message and fixup rdt_resource members' vertical alignment. ] Signed-off-by:
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Babu Moger authored
Initialize the resource functions that are different between the vendors. Some features are initialized differently between the vendors. Add _intel suffix to Intel-specific functions. For example, the MBA feature varies significantly between Intel and AMD. Separate the initialization of these resource functions. That way we can easily add AMD's functions later. Signed-off-by:
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Babu Moger authored
Move all the macros to resctrl/internal.h and rename the registers with MSR_ prefix for consistency. [bp: align MSR definitions vertically ] Signed-off-by:
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Babu Moger authored
Separate the call sequence for rdt_quirks and MBA feature. This is in preparation to handle vendor differences in these call sequences. Rename the functions to make the flow a bit more meaningful. Signed-off-by:
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Babu Moger authored
As AMD is starting to support RESCTRL features, rename the RDT functions and definitions to more generic names. Replace "intel_rdt" with "resctrl" where applicable. Signed-off-by:
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Babu Moger authored
New generation of AMD processors add support for RDT (or QOS) features. Together, these features will be called RESCTRL. With more than one vendors supporting these features, it seems more appropriate to rename these files. Create a new directory with the name 'resctrl' and move all the intel_rdt files to the new directory. This way all the resctrl related code resides inside one directory. [ bp: Add SPDX identifier to the Makefile ] Suggested-by:
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- 18 Nov, 2018 23 commits
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimmLinus Torvalds authored
Pull libnvdimm fixes from Dan Williams: "A small batch of fixes for v4.20-rc3. The overflow continuation fix addresses something that has been broken for several releases. Arguably it could wait even longer, but it's a one line fix and this finishes the last of the known address range scrub bug reports. The revert addresses a lockdep regression. The unit tests are not critical to fix, but no reason to hold this fix back. Summary: - Address Range Scrub overflow continuation handling has been broken since it was initially merged. It was only recently that error injection and platform-BIOS support enabled this corner case to be exercised. - The recent attempt to provide more isolation for the kernel Address Range Scrub state machine from userapace initiated sessions triggers a lockdep report. Revert and try again at the next merge window. - Fix a kasan reported buffer overflow in libnvdimm unit test infrastrucutre (nfit_test)" * tag 'libnvdimm-fixes-4.20-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: Revert "acpi, nfit: Further restrict userspace ARS start requests" acpi, nfit: Fix ARS overflow continuation tools/testing/nvdimm: Fix the array size for dimm devices. -
Linus Torvalds authored
Merge misc fixes from Andrew Morton: "16 fixes" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: mm/memblock.c: fix a typo in __next_mem_pfn_range() comments mm, page_alloc: check for max order in hot path scripts/spdxcheck.py: make python3 compliant tmpfs: make lseek(SEEK_DATA/SEK_HOLE) return ENXIO with a negative offset lib/ubsan.c: don't mark __ubsan_handle_builtin_unreachable as noreturn mm/vmstat.c: fix NUMA statistics updates mm/gup.c: fix follow_page_mask() kerneldoc comment ocfs2: free up write context when direct IO failed scripts/faddr2line: fix location of start_kernel in comment mm: don't reclaim inodes with many attached pages mm, memory_hotplug: check zone_movable in has_unmovable_pages mm/swapfile.c: use kvzalloc for swap_info_struct allocation MAINTAINERS: update OMAP MMC entry hugetlbfs: fix kernel BUG at fs/hugetlbfs/inode.c:444! kernel/sched/psi.c: simplify cgroup_move_task() z3fold: fix possible reclaim races
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull scheduler fix from Ingo Molnar: "Fix an exec() related scalability/performance regression, which was caused by incorrectly calculating load and migrating tasks on exec() when they shouldn't be" * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/fair: Fix cpu_util_wake() for 'execl' type workloads
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull perf fixes from Ingo Molnar: "Fix uncore PMU enumeration for CofeeLake CPUs" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86/intel/uncore: Support CoffeeLake 8th CBOX perf/x86/intel/uncore: Add more IMC PCI IDs for KabyLake and CoffeeLake CPUs
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull EFI fixes from Ingo Molnar: "Misc fixes: two warning splat fixes, a leak fix and persistent memory allocation fixes for ARM" * 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: efi: Permit calling efi_mem_reserve_persistent() from atomic context efi/arm: Defer persistent reservations until after paging_init() efi/arm/libstub: Pack FDT after populating it efi/arm: Revert deferred unmap of early memmap mapping efi: Fix debugobjects warning on 'efi_rts_work'
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git://git.armlinux.org.uk/~rmk/linux-armLinus Torvalds authored
Pull ARM spectre updates from Russell King: "These are the currently known final bits that resolve the Spectre issues. big.Little systems used to be sufficiently identical in that there were no differences between individual CPUs in the system that mattered to the kernel. With the advent of the Spectre problem, the CPUs now have differences in how the workaround is applied. As a result of previous Spectre patches, these systems ended up reporting quite a lot of: "CPUx: Spectre v2: incorrect context switching function, system vulnerable" messages due to the action of the big.Little switcher causing the CPUs to be re-initialised regularly. This series resolves that issue by making the CPU vtable unique to each CPU. However, since this is used very early, before per-cpu is setup, per-cpu can't be used. We also have a problem that two of the methods are not called from preempt-safe paths, but thankfully these remain identical between all CPUs in the system. To make sure, we validate that these are identical during boot" * 'spectre' of git://git.armlinux.org.uk/~rmk/linux-arm: ARM: spectre-v2: per-CPU vtables to work around big.Little systems ARM: add PROC_VTABLE and PROC_TABLE macros ARM: clean up per-processor check_bugs method call ARM: split out processor lookup ARM: make lookup_processor_type() non-__init -
Chen Chang authored
Link: http://lkml.kernel.org/r/20181107100247.13359-1-rainccrun@gmail.comSigned-off-by:
Chen Chang <rainccrun@gmail.com> Acked-by:
Michal Hocko <mhocko@suse.com> Acked-by:
Mike Rapoport <rppt@linux.ibm.com> Reviewed-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Michal Hocko authored
Konstantin has noticed that kvmalloc might trigger the following warning: WARNING: CPU: 0 PID: 6676 at mm/vmstat.c:986 __fragmentation_index+0x54/0x60 [...] Call Trace: fragmentation_index+0x76/0x90 compaction_suitable+0x4f/0xf0 shrink_node+0x295/0x310 node_reclaim+0x205/0x250 get_page_from_freelist+0x649/0xad0 __alloc_pages_nodemask+0x12a/0x2a0 kmalloc_large_node+0x47/0x90 __kmalloc_node+0x22b/0x2e0 kvmalloc_node+0x3e/0x70 xt_alloc_table_info+0x3a/0x80 [x_tables] do_ip6t_set_ctl+0xcd/0x1c0 [ip6_tables] nf_setsockopt+0x44/0x60 SyS_setsockopt+0x6f/0xc0 do_syscall_64+0x67/0x120 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 the problem is that we only check for an out of bound order in the slow path and the node reclaim might happen from the fast path already. This is fixable by making sure that kvmalloc doesn't ever use kmalloc for requests that are larger than KMALLOC_MAX_SIZE but this also shows that the code is rather fragile. A recent UBSAN report just underlines that by the following report UBSAN: Undefined behaviour in mm/page_alloc.c:3117:19 shift exponent 51 is too large for 32-bit type 'int' CPU: 0 PID: 6520 Comm: syz-executor1 Not tainted 4.19.0-rc2 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xd2/0x148 lib/dump_stack.c:113 ubsan_epilogue+0x12/0x94 lib/ubsan.c:159 __ubsan_handle_shift_out_of_bounds+0x2b6/0x30b lib/ubsan.c:425 __zone_watermark_ok+0x2c7/0x400 mm/page_alloc.c:3117 zone_watermark_fast mm/page_alloc.c:3216 [inline] get_page_from_freelist+0xc49/0x44c0 mm/page_alloc.c:3300 __alloc_pages_nodemask+0x21e/0x640 mm/page_alloc.c:4370 alloc_pages_current+0xcc/0x210 mm/mempolicy.c:2093 alloc_pages include/linux/gfp.h:509 [inline] __get_free_pages+0x12/0x60 mm/page_alloc.c:4414 dma_mem_alloc+0x36/0x50 arch/x86/include/asm/floppy.h:156 raw_cmd_copyin drivers/block/floppy.c:3159 [inline] raw_cmd_ioctl drivers/block/floppy.c:3206 [inline] fd_locked_ioctl+0xa00/0x2c10 drivers/block/floppy.c:3544 fd_ioctl+0x40/0x60 drivers/block/floppy.c:3571 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0xb3c/0x1a30 block/ioctl.c:601 block_ioctl+0x105/0x150 fs/block_dev.c:1883 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1c0/0x1150 fs/ioctl.c:687 ksys_ioctl+0x9e/0xb0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x7e/0xc0 fs/ioctl.c:707 do_syscall_64+0xc4/0x510 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Note that this is not a kvmalloc path. It is just that the fast path really depends on having sanitzed order as well. Therefore move the order check to the fast path. Link: http://lkml.kernel.org/r/20181113094305.GM15120@dhcp22.suse.czSigned-off-by:
Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Reported-by:
Kyungtae Kim <kt0755@gmail.com> Acked-by:
Vlastimil Babka <vbabka@suse.cz> Cc: Balbir Singh <bsingharora@gmail.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Pavel Tatashin <pavel.tatashin@microsoft.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> Cc: Aaron Lu <aaron.lu@intel.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Byoungyoung Lee <lifeasageek@gmail.com> Cc: "Dae R. Jeong" <threeearcat@gmail.com> Signed-off-by:
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Uwe Kleine-König authored
Without this change the following happens when using Python3 (3.6.6): $ echo "GPL-2.0" | python3 scripts/spdxcheck.py - FAIL: 'str' object has no attribute 'decode' Traceback (most recent call last): File "scripts/spdxcheck.py", line 253, in <module> parser.parse_lines(sys.stdin, args.maxlines, '-') File "scripts/spdxcheck.py", line 171, in parse_lines line = line.decode(locale.getpreferredencoding(False), errors='ignore') AttributeError: 'str' object has no attribute 'decode' So as the line is already a string, there is no need to decode it and the line can be dropped. /usr/bin/python on Arch is Python 3. So this would indeed be worth going into 4.19. Link: http://lkml.kernel.org/r/20181023070802.22558-1-u.kleine-koenig@pengutronix.deSigned-off-by:
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Joe Perches <joe@perches.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: <stable@vger.kernel.org> Signed-off-by:
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Yufen Yu authored
Other filesystems such as ext4, f2fs and ubifs all return ENXIO when lseek (SEEK_DATA or SEEK_HOLE) requests a negative offset. man 2 lseek says : EINVAL whence is not valid. Or: the resulting file offset would be : negative, or beyond the end of a seekable device. : : ENXIO whence is SEEK_DATA or SEEK_HOLE, and the file offset is beyond : the end of the file. Make tmpfs return ENXIO under these circumstances as well. After this, tmpfs also passes xfstests's generic/448. [akpm@linux-foundation.org: rewrite changelog] Link: http://lkml.kernel.org/r/1540434176-14349-1-git-send-email-yuyufen@huawei.comSigned-off-by:
Yufen Yu <yuyufen@huawei.com> Reviewed-by:
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Arnd Bergmann authored
gcc-8 complains about the prototype for this function: lib/ubsan.c:432:1: error: ignoring attribute 'noreturn' in declaration of a built-in function '__ubsan_handle_builtin_unreachable' because it conflicts with attribute 'const' [-Werror=attributes] This is actually a GCC's bug. In GCC internals __ubsan_handle_builtin_unreachable() declared with both 'noreturn' and 'const' attributes instead of only 'noreturn': https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84210 Workaround this by removing the noreturn attribute. [aryabinin: add information about GCC bug in changelog] Link: http://lkml.kernel.org/r/20181107144516.4587-1-aryabinin@virtuozzo.comSigned-off-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
Andrey Ryabinin <aryabinin@virtuozzo.com> Acked-by:
Olof Johansson <olof@lixom.net> Cc: <stable@vger.kernel.org> Signed-off-by:
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Janne Huttunen authored
Scan through the whole array to see if an update is needed. While we're at it, use sizeof() to be safe against any possible type changes in the future. The bug here is that we wouldn't sync per-cpu counters into global ones if there was an update of numa_stats for higher cpus. Highly theoretical one though because it is much more probable that zone_stats are updated so we would refresh anyway. So I wouldn't bother to mark this for stable, yet something nice to fix. [mhocko@suse.com: changelog enhancement] Link: http://lkml.kernel.org/r/1541601517-17282-1-git-send-email-janne.huttunen@nokia.com Fixes: 1d90ca89 ("mm: update NUMA counter threshold size") Signed-off-by:
Janne Huttunen <janne.huttunen@nokia.com> Acked-by:
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Mike Rapoport authored
Commit df06b37f ("mm/gup: cache dev_pagemap while pinning pages") modified the signature of follow_page_mask() but left the parameter description behind. Update the description to make the code and comments agree again. While at it, update formatting of the return value description to match Documentation/doc-guide/kernel-doc.rst guidelines. Link: http://lkml.kernel.org/r/1541603316-27832-1-git-send-email-rppt@linux.ibm.comSigned-off-by:
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Wengang Wang authored
The write context should also be freed even when direct IO failed. Otherwise a memory leak is introduced and entries remain in oi->ip_unwritten_list causing the following BUG later in unlink path: ERROR: bug expression: !list_empty(&oi->ip_unwritten_list) ERROR: Clear inode of 215043, inode has unwritten extents ... Call Trace: ? __set_current_blocked+0x42/0x68 ocfs2_evict_inode+0x91/0x6a0 [ocfs2] ? bit_waitqueue+0x40/0x33 evict+0xdb/0x1af iput+0x1a2/0x1f7 do_unlinkat+0x194/0x28f SyS_unlinkat+0x1b/0x2f do_syscall_64+0x79/0x1ae entry_SYSCALL_64_after_hwframe+0x151/0x0 This patch also logs, with frequency limit, direct IO failures. Link: http://lkml.kernel.org/r/20181102170632.25921-1-wen.gang.wang@oracle.comSigned-off-by:
Wengang Wang <wen.gang.wang@oracle.com> Reviewed-by:
Junxiao Bi <junxiao.bi@oracle.com> Reviewed-by:
Changwei Ge <ge.changwei@h3c.com> Reviewed-by:
Joseph Qi <jiangqi903@gmail.com> Cc: Mark Fasheh <mark@fasheh.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: <stable@vger.kernel.org> Signed-off-by:
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Randy Dunlap authored
Fix a source file reference location to the correct path name. Link: http://lkml.kernel.org/r/1d50bd3d-178e-dcd8-779f-9711887440eb@infradead.orgSigned-off-by:
Randy Dunlap <rdunlap@infradead.org> Acked-by:
Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by:
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Roman Gushchin authored
Spock reported that commit 172b06c3 ("mm: slowly shrink slabs with a relatively small number of objects") leads to a regression on his setup: periodically the majority of the pagecache is evicted without an obvious reason, while before the change the amount of free memory was balancing around the watermark. The reason behind is that the mentioned above change created some minimal background pressure on the inode cache. The problem is that if an inode is considered to be reclaimed, all belonging pagecache page are stripped, no matter how many of them are there. So, if a huge multi-gigabyte file is cached in the memory, and the goal is to reclaim only few slab objects (unused inodes), we still can eventually evict all gigabytes of the pagecache at once. The workload described by Spock has few large non-mapped files in the pagecache, so it's especially noticeable. To solve the problem let's postpone the reclaim of inodes, which have more than 1 attached page. Let's wait until the pagecache pages will be evicted naturally by scanning the corresponding LRU lists, and only then reclaim the inode structure. Link: http://lkml.kernel.org/r/20181023164302.20436-1-guro@fb.comSigned-off-by:
Roman Gushchin <guro@fb.com> Reported-by:
Spock <dairinin@gmail.com> Tested-by:
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Michal Hocko authored
Page state checks are racy. Under a heavy memory workload (e.g. stress -m 200 -t 2h) it is quite easy to hit a race window when the page is allocated but its state is not fully populated yet. A debugging patch to dump the struct page state shows has_unmovable_pages: pfn:0x10dfec00, found:0x1, count:0x0 page:ffffea0437fb0000 count:1 mapcount:1 mapping:ffff880e05239841 index:0x7f26e5000 compound_mapcount: 1 flags: 0x5fffffc0090034(uptodate|lru|active|head|swapbacked) Note that the state has been checked for both PageLRU and PageSwapBacked already. Closing this race completely would require some sort of retry logic. This can be tricky and error prone (think of potential endless or long taking loops). Workaround this problem for movable zones at least. Such a zone should only contain movable pages. Commit 15c30bc0 ("mm, memory_hotplug: make has_unmovable_pages more robust") has told us that this is not strictly true though. Bootmem pages should be marked reserved though so we can move the original check after the PageReserved check. Pages from other zones are still prone to races but we even do not pretend that memory hotremove works for those so pre-mature failure doesn't hurt that much. Link: http://lkml.kernel.org/r/20181106095524.14629-1-mhocko@kernel.org Fixes: 15c30bc0 ("mm, memory_hotplug: make has_unmovable_pages more robust") Signed-off-by:
Baoquan He <bhe@redhat.com> Tested-by:
Oscar Salvador <osalvador@suse.de> Acked-by:
Balbir Singh <bsingharora@gmail.com> Signed-off-by:
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Vasily Averin authored
Commit a2468cc9 ("swap: choose swap device according to numa node") changed 'avail_lists' field of 'struct swap_info_struct' to an array. In popular linux distros it increased size of swap_info_struct up to 40 Kbytes and now swap_info_struct allocation requires order-4 page. Switch to kvzmalloc allows to avoid unexpected allocation failures. Link: http://lkml.kernel.org/r/fc23172d-3c75-21e2-d551-8b1808cbe593@virtuozzo.com Fixes: a2468cc9 ("swap: choose swap device according to numa node") Signed-off-by:
Vasily Averin <vvs@virtuozzo.com> Acked-by:
Aaron Lu <aaron.lu@intel.com> Acked-by:
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Aaro Koskinen authored
Jarkko's e-mail address hasn't worked for a long time. We still want to keep this driver working as it is critical for some of the OMAP boards. I use and test this driver frequently, so change myself as a maintainer with "Odd Fixes" status. Link: http://lkml.kernel.org/r/20181106222750.12939-1-aaro.koskinen@iki.fiSigned-off-by:
Aaro Koskinen <aaro.koskinen@iki.fi> Acked-by:
Tony Lindgren <tony@atomide.com> Signed-off-by:
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Mike Kravetz authored
This bug has been experienced several times by the Oracle DB team. The BUG is in remove_inode_hugepages() as follows: /* * If page is mapped, it was faulted in after being * unmapped in caller. Unmap (again) now after taking * the fault mutex. The mutex will prevent faults * until we finish removing the page. * * This race can only happen in the hole punch case. * Getting here in a truncate operation is a bug. */ if (unlikely(page_mapped(page))) { BUG_ON(truncate_op); In this case, the elevated map count is not the result of a race. Rather it was incorrectly incremented as the result of a bug in the huge pmd sharing code. Consider the following: - Process A maps a hugetlbfs file of sufficient size and alignment (PUD_SIZE) that a pmd page could be shared. - Process B maps the same hugetlbfs file with the same size and alignment such that a pmd page is shared. - Process B then calls mprotect() to change protections for the mapping with the shared pmd. As a result, the pmd is 'unshared'. - Process B then calls mprotect() again to chage protections for the mapping back to their original value. pmd remains unshared. - Process B then forks and process C is created. During the fork process, we do dup_mm -> dup_mmap -> copy_page_range to copy page tables. Copying page tables for hugetlb mappings is done in the routine copy_hugetlb_page_range. In copy_hugetlb_page_range(), the destination pte is obtained by: dst_pte = huge_pte_alloc(dst, addr, sz); If pmd sharing is possible, the returned pointer will be to a pte in an existing page table. In the situation above, process C could share with either process A or process B. Since process A is first in the list, the returned pte is a pointer to a pte in process A's page table. However, the check for pmd sharing in copy_hugetlb_page_range is: /* If the pagetables are shared don't copy or take references */ if (dst_pte == src_pte) continue; Since process C is sharing with process A instead of process B, the above test fails. The code in copy_hugetlb_page_range which follows assumes dst_pte points to a huge_pte_none pte. It copies the pte entry from src_pte to dst_pte and increments this map count of the associated page. This is how we end up with an elevated map count. To solve, check the dst_pte entry for huge_pte_none. If !none, this implies PMD sharing so do not copy. Link: http://lkml.kernel.org/r/20181105212315.14125-1-mike.kravetz@oracle.com Fixes: c5c99429 ("fix hugepages leak due to pagetable page sharing") Signed-off-by:Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by:
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Hugh Dickins <hughd@google.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Prakash Sangappa <prakash.sangappa@oracle.com> Cc: <stable@vger.kernel.org> Signed-off-by:
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Olof Johansson authored
The existing code triggered an invalid warning about 'rq' possibly being used uninitialized. Instead of doing the silly warning suppression by initializa it to NULL, refactor the code to bail out early instead. Warning was: kernel/sched/psi.c: In function `cgroup_move_task': kernel/sched/psi.c:639:13: warning: `rq' may be used uninitialized in this function [-Wmaybe-uninitialized] Link: http://lkml.kernel.org/r/20181103183339.8669-1-olof@lixom.net Fixes: 2ce7135a ("psi: cgroup support") Signed-off-by:
Johannes Weiner <hannes@cmpxchg.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by:
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Vitaly Wool authored
Reclaim and free can race on an object which is basically fine but in order for reclaim to be able to map "freed" object we need to encode object length in the handle. handle_to_chunks() is then introduced to extract object length from a handle and use it during mapping. Moreover, to avoid racing on a z3fold "headless" page release, we should not try to free that page in z3fold_free() if the reclaim bit is set. Also, in the unlikely case of trying to reclaim a page being freed, we should not proceed with that page. While at it, fix the page accounting in reclaim function. This patch supersedes "[PATCH] z3fold: fix reclaim lock-ups". Link: http://lkml.kernel.org/r/20181105162225.74e8837d03583a9b707cf559@gmail.comSigned-off-by:
Vitaly Wool <vitaly.vul@sony.com> Signed-off-by:
Jongseok Kim <ks77sj@gmail.com> Reported-by-by:
Snild Dolkow <snild@sony.com> Signed-off-by:
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- 16 Nov, 2018 1 commit
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git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fsLinus Torvalds authored
Pull fsnotify fix from Jan Kara: "One small fsnotify fix for duplicate events" * tag 'fsnotify_for_v4.20-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: fanotify: fix handling of events on child sub-directory
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