lwn.git/tools/include, branch docs-5.6

Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2019-11-26T23:04:47+00:00

Pull perf updates from Ingo Molnar: "The main kernel side changes in this cycle were: - Various Intel-PT updates and optimizations (Alexander Shishkin) - Prohibit kprobes on Xen/KVM emulate prefixes (Masami Hiramatsu) - Add support for LSM and SELinux checks to control access to the perf syscall (Joel Fernandes) - Misc other changes, optimizations, fixes and cleanups - see the shortlog for details. There were numerous tooling changes as well - 254 non-merge commits. Here are the main changes - too many to list in detail: - Enhancements to core tooling infrastructure, perf.data, libperf, libtraceevent, event parsing, vendor events, Intel PT, callchains, BPF support and instruction decoding. - There were updates to the following tools: perf annotate perf diff perf inject perf kvm perf list perf maps perf parse perf probe perf record perf report perf script perf stat perf test perf trace - And a lot of other changes: please see the shortlog and Git log for more details" * 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (279 commits) perf parse: Fix potential memory leak when handling tracepoint errors perf probe: Fix spelling mistake "addrees" -> "address" libtraceevent: Fix memory leakage in copy_filter_type libtraceevent: Fix header installation perf intel-bts: Does not support AUX area sampling perf intel-pt: Add support for decoding AUX area samples perf intel-pt: Add support for recording AUX area samples perf pmu: When using default config, record which bits of config were changed by the user perf auxtrace: Add support for queuing AUX area samples perf session: Add facility to peek at all events perf auxtrace: Add support for dumping AUX area samples perf inject: Cut AUX area samples perf record: Add aux-sample-size config term perf record: Add support for AUX area sampling perf auxtrace: Add support for AUX area sample recording perf auxtrace: Move perf_evsel__find_pmu() perf record: Add a function to test for kernel support for AUX area sampling perf tools: Add kernel AUX area sampling definitions perf/core: Make the mlock accounting simple again perf report: Jump to symbol source view from total cycles view ...

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

2019-11-26T04:02:57+00:00

Pull networking updates from David Miller: "Another merge window, another pull full of stuff: 1) Support alternative names for network devices, from Jiri Pirko. 2) Introduce per-netns netdev notifiers, also from Jiri Pirko. 3) Support MSG_PEEK in vsock/virtio, from Matias Ezequiel Vara Larsen. 4) Allow compiling out the TLS TOE code, from Jakub Kicinski. 5) Add several new tracepoints to the kTLS code, also from Jakub. 6) Support set channels ethtool callback in ena driver, from Sameeh Jubran. 7) New SCTP events SCTP_ADDR_ADDED, SCTP_ADDR_REMOVED, SCTP_ADDR_MADE_PRIM, and SCTP_SEND_FAILED_EVENT. From Xin Long. 8) Add XDP support to mvneta driver, from Lorenzo Bianconi. 9) Lots of netfilter hw offload fixes, cleanups and enhancements, from Pablo Neira Ayuso. 10) PTP support for aquantia chips, from Egor Pomozov. 11) Add UDP segmentation offload support to igb, ixgbe, and i40e. From Josh Hunt. 12) Add smart nagle to tipc, from Jon Maloy. 13) Support L2 field rewrite by TC offloads in bnxt_en, from Venkat Duvvuru. 14) Add a flow mask cache to OVS, from Tonghao Zhang. 15) Add XDP support to ice driver, from Maciej Fijalkowski. 16) Add AF_XDP support to ice driver, from Krzysztof Kazimierczak. 17) Support UDP GSO offload in atlantic driver, from Igor Russkikh. 18) Support it in stmmac driver too, from Jose Abreu. 19) Support TIPC encryption and auth, from Tuong Lien. 20) Introduce BPF trampolines, from Alexei Starovoitov. 21) Make page_pool API more numa friendly, from Saeed Mahameed. 22) Introduce route hints to ipv4 and ipv6, from Paolo Abeni. 23) Add UDP segmentation offload to cxgb4, Rahul Lakkireddy" * git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1857 commits) libbpf: Fix usage of u32 in userspace code mm: Implement no-MMU variant of vmalloc_user_node_flags slip: Fix use-after-free Read in slip_open net: dsa: sja1105: fix sja1105_parse_rgmii_delays() macvlan: schedule bc_work even if error enetc: add support Credit Based Shaper(CBS) for hardware offload net: phy: add helpers phy_(un)lock_mdio_bus mdio_bus: don't use managed reset-controller ax88179_178a: add ethtool_op_get_ts_info() mlxsw: spectrum_router: Fix use of uninitialized adjacency index mlxsw: spectrum_router: After underlay moves, demote conflicting tunnels bpf: Simplify __bpf_arch_text_poke poke type handling bpf: Introduce BPF_TRACE_x helper for the tracing tests bpf: Add bpf_jit_blinding_enabled for !CONFIG_BPF_JIT bpf, testing: Add various tail call test cases bpf, x86: Emit patchable direct jump as tail call bpf: Constant map key tracking for prog array pokes bpf: Add poke dependency tracking for prog array maps bpf: Add initial poke descriptor table for jit images bpf: Move owner type, jited info into array auxiliary data ...

perf tools: Add kernel AUX area sampling definitions

2019-11-21T13:54:20+00:00

Add kernel AUX area sampling definitions, which brings perf_event.h into line with the kernel version. New sample type PERF_SAMPLE_AUX requests a sample of the AUX area buffer. New perf_event_attr member 'aux_sample_size' specifies the desired size of the sample. Also add support for parsing samples containing AUX area data i.e. PERF_SAMPLE_AUX. Committer notes: I squashed the first two patches in this series to avoid breaking automatic bisection, i.e. after applying only the original first patch in this series we would have: # perf test -v parsing 26: Sample parsing : --- start --- test child forked, pid 17018 sample format has changed, some new PERF_SAMPLE_ bit was introduced - test needs updating test child finished with -1 ---- end ---- Sample parsing: FAILED! # With the two paches combined: # perf test parsing 26: Sample parsing : Ok # Signed-off-by: Adrian Hunter Tested-by: Arnaldo Carvalho de Melo Cc: Jiri Olsa Link: http://lore.kernel.org/lkml/20191115124225.5247-3-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo

bpf: Add mmap() support for BPF_MAP_TYPE_ARRAY

2019-11-18T10:41:59+00:00

Add ability to memory-map contents of BPF array map. This is extremely useful for working with BPF global data from userspace programs. It allows to avoid typical bpf_map_{lookup,update}_elem operations, improving both performance and usability. There had to be special considerations for map freezing, to avoid having writable memory view into a frozen map. To solve this issue, map freezing and mmap-ing is happening under mutex now: - if map is already frozen, no writable mapping is allowed; - if map has writable memory mappings active (accounted in map->writecnt), map freezing will keep failing with -EBUSY; - once number of writable memory mappings drops to zero, map freezing can be performed again. Only non-per-CPU plain arrays are supported right now. Maps with spinlocks can't be memory mapped either. For BPF_F_MMAPABLE array, memory allocation has to be done through vmalloc() to be mmap()'able. We also need to make sure that array data memory is page-sized and page-aligned, so we over-allocate memory in such a way that struct bpf_array is at the end of a single page of memory with array->value being aligned with the start of the second page. On deallocation we need to accomodate this memory arrangement to free vmalloc()'ed memory correctly. One important consideration regarding how memory-mapping subsystem functions. Memory-mapping subsystem provides few optional callbacks, among them open() and close(). close() is called for each memory region that is unmapped, so that users can decrease their reference counters and free up resources, if necessary. open() is *almost* symmetrical: it's called for each memory region that is being mapped, **except** the very first one. So bpf_map_mmap does initial refcnt bump, while open() will do any extra ones after that. Thus number of close() calls is equal to number of open() calls plus one more. Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Acked-by: Song Liu Acked-by: John Fastabend Acked-by: Johannes Weiner Link: https://lore.kernel.org/bpf/20191117172806.2195367-4-andriin@fb.com

libbpf: Add support for attaching BPF programs to other BPF programs

2019-11-15T22:45:37+00:00

Extend libbpf api to pass attach_prog_fd into bpf_object__open. Signed-off-by: Alexei Starovoitov Signed-off-by: Daniel Borkmann Acked-by: Song Liu Link: https://lore.kernel.org/bpf/20191114185720.1641606-19-ast@kernel.org

libbpf: Add support to attach to fentry/fexit tracing progs

2019-11-15T22:42:31+00:00

Teach libbpf to recognize tracing programs types and attach them to fentry/fexit. Signed-off-by: Alexei Starovoitov Signed-off-by: Daniel Borkmann Acked-by: Song Liu Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20191114185720.1641606-7-ast@kernel.org

Merge branch 'for-linus' into for-5.5/block

2019-11-07T19:27:19+00:00

Pull on for-linus to resolve what otherwise would have been a conflict with the cgroups rstat patchset from Tejun. * for-linus: (942 commits) blkcg: make blkcg_print_stat() print stats only for online blkgs nvme: change nvme_passthru_cmd64 to explicitly mark rsvd nvme-multipath: fix crash in nvme_mpath_clear_ctrl_paths nvme-rdma: fix a segmentation fault during module unload iocost: don't nest spin_lock_irq in ioc_weight_write() io_uring: ensure we clear io_kiocb->result before each issue um-ubd: Entrust re-queue to the upper layers nvme-multipath: remove unused groups_only mode in ana log nvme-multipath: fix possible io hang after ctrl reconnect io_uring: don't touch ctx in setup after ring fd install io_uring: Fix leaked shadow_req Linux 5.4-rc5 riscv: cleanup do_trap_break nbd: verify socket is supported during setup ata: libahci_platform: Fix regulator_get_optional() misuse nbd: handle racing with error'ed out commands nbd: protect cmd->status with cmd->lock io_uring: fix bad inflight accounting for SETUP_IOPOLL|SETUP_SQTHREAD io_uring: used cached copies of sq->dropped and cq->overflow ARM: dts: stm32: relax qspi pins slew-rate for stm32mp157 ...

Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

2019-11-02T22:29:58+00:00

Alexei Starovoitov says: ==================== pull-request: bpf-next 2019-11-02 The following pull-request contains BPF updates for your *net-next* tree. We've added 30 non-merge commits during the last 7 day(s) which contain a total of 41 files changed, 1864 insertions(+), 474 deletions(-). The main changes are: 1) Fix long standing user vs kernel access issue by introducing bpf_probe_read_user() and bpf_probe_read_kernel() helpers, from Daniel. 2) Accelerated xskmap lookup, from Björn and Maciej. 3) Support for automatic map pinning in libbpf, from Toke. 4) Cleanup of BTF-enabled raw tracepoints, from Alexei. 5) Various fixes to libbpf and selftests. ==================== Signed-off-by: David S. Miller

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2019-11-02T20:54:56+00:00

The only slightly tricky merge conflict was the netdevsim because the mutex locking fix overlapped a lot of driver reload reorganization. The rest were (relatively) trivial in nature. Signed-off-by: David S. Miller

bpf: Add probe_read_{user, kernel} and probe_read_{user, kernel}_str helpers

2019-11-02T19:39:12+00:00

The current bpf_probe_read() and bpf_probe_read_str() helpers are broken in that they assume they can be used for probing memory access for kernel space addresses /as well as/ user space addresses. However, plain use of probe_kernel_read() for both cases will attempt to always access kernel space address space given access is performed under KERNEL_DS and some archs in-fact have overlapping address spaces where a kernel pointer and user pointer would have the /same/ address value and therefore accessing application memory via bpf_probe_read{,_str}() would read garbage values. Lets fix BPF side by making use of recently added 3d7081822f7f ("uaccess: Add non-pagefault user-space read functions"). Unfortunately, the only way to fix this status quo is to add dedicated bpf_probe_read_{user,kernel}() and bpf_probe_read_{user,kernel}_str() helpers. The bpf_probe_read{,_str}() helpers are kept as-is to retain their current behavior. The two *_user() variants attempt the access always under USER_DS set, the two *_kernel() variants will -EFAULT when accessing user memory if the underlying architecture has non-overlapping address ranges, also avoiding throwing the kernel warning via 00c42373d397 ("x86-64: add warning for non-canonical user access address dereferences"). Fixes: a5e8c07059d0 ("bpf: add bpf_probe_read_str helper") Fixes: 2541517c32be ("tracing, perf: Implement BPF programs attached to kprobes") Signed-off-by: Daniel Borkmann Signed-off-by: Alexei Starovoitov Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/796ee46e948bc808d54891a1108435f8652c6ca4.1572649915.git.daniel@iogearbox.net