- 22 Nov, 2018 1 commit
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Arnaldo Carvalho de Melo authored
A new 'perf bench epoll' will use this, and to disable it for older systems, add a feature test for this API. This is just a simple program that if successfully compiled, means that the feature is present, at least at the library level, in a build that sets the output directory to /tmp/build/perf (using O=/tmp/build/perf), we end up with: $ ls -la /tmp/build/perf/feature/test-eventfd* -rwxrwxr-x. 1 acme acme 8176 Nov 21 15:58 /tmp/build/perf/feature/test-eventfd.bin -rw-rw-r--. 1 acme acme 588 Nov 21 15:58 /tmp/build/perf/feature/test-eventfd.d -rw-rw-r--. 1 acme acme 0 Nov 21 15:58 /tmp/build/perf/feature/test-eventfd.make.output $ ldd /tmp/build/perf/feature/test-eventfd.bin linux-vdso.so.1 (0x00007fff3bf3f000) libc.so.6 => /lib64/libc.so.6 (0x00007fa984061000) /lib64/ld-linux-x86-64.so.2 (0x00007fa984417000) $ grep eventfd -A 2 -B 2 /tmp/build/perf/FEATURE-DUMP feature-dwarf=1 feature-dwarf_getlocations=1 feature-eventfd=1 feature-fortify-source=1 feature-sync-compare-and-swap=1 $ The main thing here is that in the end we'll have -DHAVE_EVENTFD in CFLAGS, and then the 'perf bench' entry needing that API can be selectively pruned. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: David Ahern <dsahern@gmail.com> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Jason Baron <jbaron@akamai.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-wkeldwob7dpx6jvtuzl8164k@git.kernel.orgSigned-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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- 21 Nov, 2018 18 commits
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Davidlohr Bueso authored
Both futex and epoll need this call, and can cause build failure on systems that don't have it pthread_attr_setaffinity_np(). Signed-off-by:
Davidlohr Bueso <dbueso@suse.de> Reported-by:
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Milian Wolff authored
The iregs output was missing the newline at end as well as the leading ABI output. This made it hard to compare the iregs and uregs values. Instead, use a single function to output the register values and use it for both, iregs and uregs, to ensure the output is consistent. Before: perf 7049 [-01] 1343.354347: 1 cycles:ppp: ffffffffa7bc21ce perf_event_exec+0x18e (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa7c7ead3 setup_new_exec+0xf3 (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa7cd7be5 load_elf_binary+0x395 (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa7c7e540 search_binary_handler+0x80 (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa7c7f1aa __do_execve_file.isra.13+0x58a (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa7c7f561 do_execve+0x21 (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa7c7f596 __x64_sys_execve+0x26 (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa7a041cb do_syscall_64+0x5b (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa840008c entry_SYSCALL_64+0x7c (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) AX:0x80000000 BX:0x0 CX:0x0 DX:0x7 SI:0xf DI:0x286 BP:0xffff95bc8213a460 SP:0xffffacbf0ba97d18 IP:0xffffffffa7bc21cd FLAGS:0x28e CS:0x10 SS:0x18 R8:0x2 R9:0x21440 R10:0x33816fb3b8c R11:0x1 R12:0xffff95bc8213a460 R13:0xffff95bc8213a400 R14:0xffff95bc8213a400 R15:0x1 ABI:2 AX:0xffffffffffffffda BX:0xffffffffffffffff CX:0x7f84ad85798b DX:0x560209699d50 SI:0x7ffe2c7a6820 DI:0x7ffe2c7a8c9b BP:0x7ffe2c7a20d0 SP:0x7ffe2c7a2058 IP:0x7f84ad85798b FLAGS:0x206 CS:0x33 SS:0x2b R8:0x7ffe2c7a2030 R9:0x7f84ae55f010 R10:0x8 R11:0x206 R12:0xffffffffffffffff R13:0xffffffffffffffff R14:0xffffffffffffffff R15:0xffffffffffffffff perf 7049 [-01] 1343.354363: 1 cycles:ppp: ... After: perf 7049 [-01] 1343.354347: 1 cycles:ppp: ffffffffa7bc21ce perf_event_exec+0x18e (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa7c7ead3 setup_new_exec+0xf3 (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa7cd7be5 load_elf_binary+0x395 (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa7c7e540 search_binary_handler+0x80 (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa7c7f1aa __do_execve_file.isra.13+0x58a (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa7c7f561 do_execve+0x21 (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa7c7f596 __x64_sys_execve+0x26 (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa7a041cb do_syscall_64+0x5b (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ffffffffa840008c entry_SYSCALL_64+0x7c (/lib/modules/4.20.0-rc1perf-devel-05115-gc0bc98f76e39-dirty/build/vmlinux) ABI:2 AX:0x80000000 BX:0x0 CX:0x0 DX:0x7 SI:0xf DI:0x286 BP:0xffff95bc8213a460 SP:0xffffacbf0ba97d18 IP:0xffffffffa7bc21cd FLAGS:0x28e CS:0x10 SS:0x18 R8:0x2 R9:0x21440 R10:0x33816fb3b8c R11:0x1 R12:0xffff95bc8213a460 R13:0xffff95bc8213a400 R14:0xffff95bc8213a400 R15:0x1 ABI:2 AX:0xffffffffffffffda BX:0xffffffffffffffff CX:0x7f84ad85798b DX:0x560209699d50 SI:0x7ffe2c7a6820 DI:0x7ffe2c7a8c9b BP:0x7ffe2c7a20d0 SP:0x7ffe2c7a2058 IP:0x7f84ad85798b FLAGS:0x206 CS:0x33 SS:0x2b R8:0x7ffe2c7a2030 R9:0x7f84ae55f010 R10:0x8 R11:0x206 R12:0xffffffffffffffff R13:0xffffffffffffffff R14:0xffffffffffffffff R15:0xffffffffffffffff perf 7049 [-01] 1343.354363: 1 cycles:ppp: ... Signed-off-by:Milian Wolff <milian.wolff@kdab.com> Acked-by:
Jiri Olsa <jolsa@kernel.org> Link: http://lkml.kernel.org/r/20181107223437.9071-1-milian.wolff@kdab.comSigned-off-by:
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Arnaldo Carvalho de Melo authored
While working on augmented syscalls I got into this error: # trace -vv --filter-pids 2469,1663 -e tools/perf/examples/bpf/augmented_raw_syscalls.c sleep 1 <SNIP> libbpf: map 0 is "__augmented_syscalls__" libbpf: map 1 is "__bpf_stdout__" libbpf: map 2 is "pids_filtered" libbpf: map 3 is "syscalls" libbpf: collecting relocating info for: '.text' libbpf: relo for 13 value 84 name 133 libbpf: relocation: insn_idx=3 libbpf: relocation: find map 3 (pids_filtered) for insn 3 libbpf: collecting relocating info for: 'raw_syscalls:sys_enter' libbpf: relo for 8 value 0 name 0 libbpf: relocation: insn_idx=1 libbpf: relo for 8 value 0 name 0 libbpf: relocation: insn_idx=3 libbpf: relo for 9 value 28 name 178 libbpf: relocation: insn_idx=36 libbpf: relocation: find map 1 (__augmented_syscalls__) for insn 36 libbpf: collecting relocating info for: 'raw_syscalls:sys_exit' libbpf: relo for 8 value 0 name 0 libbpf: relocation: insn_idx=0 libbpf: relo for 8 value 0 name 0 libbpf: relocation: insn_idx=2 bpf: config program 'raw_syscalls:sys_enter' bpf: config program 'raw_syscalls:sys_exit' libbpf: create map __bpf_stdout__: fd=3 libbpf: create map __augmented_syscalls__: fd=4 libbpf: create map syscalls: fd=5 libbpf: create map pids_filtered: fd=6 libbpf: added 13 insn from .text to prog raw_syscalls:sys_enter libbpf: added 13 insn from .text to prog raw_syscalls:sys_exit libbpf: load bpf program failed: Operation not permitted libbpf: failed to load program 'raw_syscalls:sys_exit' libbpf: failed to load object 'tools/perf/examples/bpf/augmented_raw_syscalls.c' bpf: load objects failed: err=-4009: (Incorrect kernel version) event syntax error: 'tools/perf/examples/bpf/augmented_raw_syscalls.c' \___ Failed to load program for unknown reason (add -v to see detail) Run 'perf list' for a list of valid events Usage: perf trace [<options>] [<command>] or: perf trace [<options>] -- <command> [<options>] or: perf trace record [<options>] [<command>] or: perf trace record [<options>] -- <command> [<options>] -e, --event <event> event/syscall selector. use 'perf list' to list available events If I then try to use strace (perf trace'ing 'perf trace' needs some more work before its possible) to get a bit more info I get: # strace -e bpf trace --filter-pids 2469,1663 -e tools/perf/examples/bpf/augmented_raw_syscalls.c sleep 1 bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_PERF_EVENT_ARRAY, key_size=4, value_size=4, max_entries=4, map_flags=0, inner_map_fd=0, map_name="__bpf_stdout__", map_ifindex=0}, 72) = 3 bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_PERF_EVENT_ARRAY, key_size=4, value_size=4, max_entries=4, map_flags=0, inner_map_fd=0, map_name="__augmented_sys", map_ifindex=0}, 72) = 4 bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_ARRAY, key_size=4, value_size=1, max_entries=500, map_flags=0, inner_map_fd=0, map_name="syscalls", map_ifindex=0}, 72) = 5 bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_HASH, key_size=4, value_size=1, max_entries=512, map_flags=0, inner_map_fd=0, map_name="pids_filtered", map_ifindex=0}, 72) = 6 bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_TRACEPOINT, insn_cnt=57, insns=0x1223f50, license="GPL", log_level=0, log_size=0, log_buf=NULL, kern_version=KERNEL_VERSION(4, 18, 10), prog_flags=0, prog_name="sys_enter", prog_ifindex=0, expected_attach_type=BPF_CGROUP_INET_INGRESS}, 72) = 7 bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_TRACEPOINT, insn_cnt=18, insns=0x1224120, license="GPL", log_level=0, log_size=0, log_buf=NULL, kern_version=KERNEL_VERSION(4, 18, 10), prog_flags=0, prog_name="sys_exit", prog_ifindex=0, expected_attach_type=BPF_CGROUP_INET_INGRESS}, 72) = -1 EPERM (Operation not permitted) bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_TRACEPOINT, insn_cnt=18, insns=0x1224120, license="GPL", log_level=1, log_size=262144, log_buf="", kern_version=KERNEL_VERSION(4, 18, 10), prog_flags=0, prog_name="sys_exit", prog_ifindex=0, expected_attach_type=BPF_CGROUP_INET_INGRESS}, 72) = -1 EPERM (Operation not permitted) bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_KPROBE, insn_cnt=18, insns=0x1224120, license="GPL", log_level=0, log_size=0, log_buf=NULL, kern_version=KERNEL_VERSION(4, 18, 10), prog_flags=0, prog_name="sys_exit", prog_ifindex=0, expected_attach_type=BPF_CGROUP_INET_INGRESS}, 72) = -1 EPERM (Operation not permitted) event syntax error: 'tools/perf/examples/bpf/augmented_raw_syscalls.c' \___ Failed to load program for unknown reason <SNIP similar output as without 'strace'> # I managed to create the maps, etc, but then installing the "sys_exit" hook into the "raw_syscalls:sys_exit" tracepoint somehow gets -EPERMed... I then go and try reducing the size of this new table: +++ b/tools/perf/examples/bpf/augmented_raw_syscalls.c @@ -47,6 +47,17 @@ struct augmented_filename { #define SYS_OPEN 2 #define SYS_OPENAT 257 +struct syscall { + bool filtered; +}; + +struct bpf_map SEC("maps") syscalls = { + .type = BPF_MAP_TYPE_ARRAY, + .key_size = sizeof(int), + .value_size = sizeof(struct syscall), + .max_entries = 500, +}; And after reducing that .max_entries a tad, it works. So yeah, the "unknown reason" should be related to the number of bytes all this is taking, reduce the default for pid_map()s so that we can have a "syscalls" map with enough slots for all syscalls in most arches. And take notes about this error message, improve it :-) Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: David Ahern <dsahern@gmail.com> Cc: Edward Cree <ecree@solarflare.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Martin KaFai Lau <kafai@fb.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Cc: Yonghong Song <yhs@fb.com> Link: https://lkml.kernel.org/n/tip-yjzhak8asumz9e9hts2dgplp@git.kernel.orgSigned-off-by: -
Milian Wolff authored
This change makes it much easier to easily distinguish between consecutive samples by keeping the empty line between them, like we see when we do not enable uregs output. Before: cpp-inlining 28298 [-01] 54837.342780: 3068085 cycles:pp: 7ffff7c96709 __hypot_finite+0xa9 (/usr/lib/libm-2.28.so) ... ABI:2 AX:0x0 BX:0x40f56cf6 CX:0x294a3ae7 ... cpp-inlining 28298 [-01] 54837.344493: 2881929 cycles:pp: 7ffff7c96696 __hypot_finite+0x36 (/usr/lib/libm-2.28.so) ... ABI:2 AX:0x40d440c7 BX:0x40d440c7 CX:0x4d45e5da ... After: cpp-inlining 28298 [-01] 54837.342780: 3068085 cycles:pp: 7ffff7c96709 __hypot_finite+0xa9 (/usr/lib/libm-2.28.so) ... ABI:2 AX:0x0 BX:0x40f56cf6 CX:0x294a3ae7 ... cpp-inlining 28298 [-01] 54837.344493: 2881929 cycles:pp: 7ffff7c96696 __hypot_finite+0x36 (/usr/lib/libm-2.28.so) ... ABI:2 AX:0x40d440c7 BX:0x40d440c7 CX:0x4d45e5da ... Signed-off-by: -
Arnaldo Carvalho de Melo authored
Now that we have the "filtered_pids" logic in place, no need to do this rough filter to avoid the feedback loop from 'perf trace's own syscalls, revert it. This reverts commit 7ed71f124284359676b6496ae7db724fee9da753. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-88vh02cnkam0vv5f9vp02o3h@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
Now that 'perf trace' fills in that "filtered_pids" BPF map, remove the set of filtered pids used as an example to test that feature. That feature works like this: Starting a system wide 'strace' like 'perf trace' augmented session we noticed that lots of events take place for a pid, which ends up being the feedback loop of perf trace's syscalls being processed by the 'gnome-terminal' process: # perf trace -e tools/perf/examples/bpf/augmented_raw_syscalls.c 0.391 ( 0.002 ms): gnome-terminal/2469 read(fd: 17</dev/ptmx>, buf: 0x564b79f750bc, count: 8176) = 453 0.394 ( 0.001 ms): gnome-terminal/2469 read(fd: 17</dev/ptmx>, buf: 0x564b79f75280, count: 7724) = -1 EAGAIN Resource temporarily unavailable 0.438 ( 0.001 ms): gnome-terminal/2469 read(fd: 4<anon_inode:[eventfd]>, buf: 0x7fffc696aeb0, count: 16) = 8 0.519 ( 0.001 ms): gnome-terminal/2469 read(fd: 17</dev/ptmx>, buf: 0x564b79f75280, count: 7724) = 114 0.522 ( 0.001 ms): gnome-terminal/2469 read(fd: 17</dev/ptmx>, buf: 0x564b79f752f1, count: 7611) = -1 EAGAIN Resource temporarily unavailable ^C So we can use --filter-pids to get rid of that one, and in this case what is being used to implement that functionality is that "filtered_pids" BPF map that the tools/perf/examples/bpf/augmented_raw_syscalls.c created and that 'perf trace' bpf loader noticed and created a "struct bpf_map" associated that then got populated by 'perf trace': # perf trace --filter-pids 2469 -e tools/perf/examples/bpf/augmented_raw_syscalls.c 0.020 ( 0.002 ms): gnome-shell/1663 epoll_pwait(epfd: 12<anon_inode:[eventpoll]>, events: 0x7ffd8f3ef960, maxevents: 32, sigsetsize: 8) = 1 0.025 ( 0.002 ms): gnome-shell/1663 read(fd: 24</dev/input/event4>, buf: 0x560c01bb8240, count: 8112) = 48 0.029 ( 0.001 ms): gnome-shell/1663 read(fd: 24</dev/input/event4>, buf: 0x560c01bb8258, count: 8088) = -1 EAGAIN Resource temporarily unavailable 0.032 ( 0.001 ms): gnome-shell/1663 read(fd: 24</dev/input/event4>, buf: 0x560c01bb8240, count: 8112) = -1 EAGAIN Resource temporarily unavailable 0.040 ( 0.003 ms): gnome-shell/1663 recvmsg(fd: 46<socket:[35893]>, msg: 0x7ffd8f3ef950) = -1 EAGAIN Resource temporarily unavailable 21.529 ( 0.002 ms): gnome-shell/1663 epoll_pwait(epfd: 5<anon_inode:[eventpoll]>, events: 0x7ffd8f3ef960, maxevents: 32, sigsetsize: 8) = 1 21.533 ( 0.004 ms): gnome-shell/1663 recvmsg(fd: 82<socket:[42826]>, msg: 0x7ffd8f3ef7b0, flags: DONTWAIT|CMSG_CLOEXEC) = 236 21.581 ( 0.006 ms): gnome-shell/1663 ioctl(fd: 8</dev/dri/card0>, cmd: DRM_I915_GEM_BUSY, arg: 0x7ffd8f3ef060) = 0 21.605 ( 0.020 ms): gnome-shell/1663 ioctl(fd: 8</dev/dri/card0>, cmd: DRM_I915_GEM_CREATE, arg: 0x7ffd8f3eeea0) = 0 21.626 ( 0.119 ms): gnome-shell/1663 ioctl(fd: 8</dev/dri/card0>, cmd: DRM_I915_GEM_SET_DOMAIN, arg: 0x7ffd8f3eee94) = 0 21.746 ( 0.081 ms): gnome-shell/1663 ioctl(fd: 8</dev/dri/card0>, cmd: DRM_I915_GEM_PWRITE, arg: 0x7ffd8f3eeea0) = 0 ^C Oops, yet another gnome process that is involved with the output that 'perf trace' generates, lets filter that out too: # perf trace --filter-pids 2469,1663 -e tools/perf/examples/bpf/augmented_raw_syscalls.c ? ( ): wpa_supplicant/1366 ... [continued]: select()) = 0 Timeout 0.006 ( 0.002 ms): wpa_supplicant/1366 clock_gettime(which_clock: BOOTTIME, tp: 0x7fffe5b1e430) = 0 0.011 ( 0.001 ms): wpa_supplicant/1366 clock_gettime(which_clock: BOOTTIME, tp: 0x7fffe5b1e3e0) = 0 0.014 ( 0.001 ms): wpa_supplicant/1366 clock_gettime(which_clock: BOOTTIME, tp: 0x7fffe5b1e430) = 0 ? ( ): gmain/1791 ... [continued]: poll()) = 0 Timeout 0.017 ( ): wpa_supplicant/1366 select(n: 6, inp: 0x55646fed3ad0, outp: 0x55646fed3b60, exp: 0x55646fed3bf0, tvp: 0x7fffe5b1e4a0) ... 157.879 ( 0.019 ms): gmain/1791 inotify_add_watch(fd: 8<anon_inode:inotify>, pathname: , mask: 16789454) = -1 ENOENT No such file or directory ? ( ): cupsd/1001 ... [continued]: epoll_pwait()) = 0 ? ( ): gsd-color/1908 ... [continued]: poll()) = 0 Timeout 499.615 ( ): cupsd/1001 epoll_pwait(epfd: 4<anon_inode:[eventpoll]>, events: 0x557a21166500, maxevents: 4096, timeout: 1000, sigsetsize: 8) ... 586.593 ( 0.004 ms): gsd-color/1908 recvmsg(fd: 3<socket:[38074]>, msg: 0x7ffdef34e800) = -1 EAGAIN Resource temporarily unavailable ? ( ): fwupd/2230 ... [continued]: poll()) = 0 Timeout ? ( ): rtkit-daemon/906 ... [continued]: poll()) = 0 Timeout ? ( ): rtkit-daemon/907 ... [continued]: poll()) = 1 724.603 ( 0.007 ms): rtkit-daemon/907 read(fd: 6<anon_inode:[eventfd]>, buf: 0x7f05ff768d08, count: 8) = 8 ? ( ): ssh/5461 ... [continued]: select()) = 1 810.431 ( 0.002 ms): ssh/5461 clock_gettime(which_clock: BOOTTIME, tp: 0x7ffd7f39f870) = 0 ^C Several syscall exit events for syscalls in flight when 'perf trace' started, etc. Saner :-) Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-c3tu5yg204p5mvr9kvwew07n@git.kernel.orgSigned-off-by: -
Arnaldo Carvalho de Melo authored
This makes the augmented_syscalls support the --filter-pids and auto-filtered feedback loop pids just like when working without BPF, i.e. with just raw_syscalls:sys_{enter,exit} and tracepoint filters. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-zc5n453sxxm0tz1zfwwelyti@git.kernel.orgSigned-off-by: -
Arnaldo Carvalho de Melo authored
Lookup for the first map named "filtered_pids" and, if augmenting syscalls, i.e. if a BPF event is present and the "__augmented_syscalls__" is present, then fill in that map with the pids to filter, be it feedback loop ones (perf trace's pid, its father if it is "sshd", more auto-filtered in the future) or the ones explicitely stated in the tool command line via --filter-pids. The code to actually fill in the map comes next. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-rhzytmw7qpe6lqyjxi1ded9t@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
As we'll need that name for a new function to set filters for both tracepoints and BPF maps for filtering pids. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-mdkck6hf3fnd21rz2766280q@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
To better reflect that this is a tracepoint filter, as opposed, for instance to map based BPF filters. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-9138svli6ddcphrr3ymy9oy3@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
Just to test filtering a bunch of pids, now its time to go and get that hooked up in 'perf trace', right after we load the bpf program, if we find a "pids_filtered" map defined, we'll populate it with the filtered pids. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-1i9s27wqqdhafk3fappow84x@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
When testing system wide tracing without filtering the syscalls called by 'perf trace' itself we get into a feedback loop, drop for now those two syscalls, that are the ones that 'perf trace' does in its loop for writing the syscalls it intercepts, to help with testing till we get that filtering in place. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-rkbu536af66dbsfx51sr8yof@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
Will be used in the augmented_raw_syscalls.c to implement 'perf trace --filter-pids'. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-9sybmz4vchlbpqwx2am13h9e@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
Starting with a helper for a basic pid_map(), a hash using a pid as a key. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-gdwvq53wltvq6b3g5tdmh0cw@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
Leftover from when we started augmented_raw_syscalls.c from tools/perf/examples/bpf/augmented_syscalls. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Fixes: e58a0322dbac ("perf examples bpf: Start augmenting raw_syscalls:sys_{start,exit}") Link: https://lkml.kernel.org/n/tip-pmts9ls2skh8n3zisb4txudd@git.kernel.orgSigned-off-by: -
Arnaldo Carvalho de Melo authored
Just to show where we'll hook pid based filters, and what we use to obtain the current pid, using a BPF getpid() equivalent. Now we need to remove that hardcoded PID with a BPF hash map, so that we start by filtering 'perf trace's own PID, implement the --filter-pid functionality, etc. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-oshrcgcekiyhd0whwisxfvtv@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
Start with a getpid() function wrapping BPF_FUNC_get_current_pid_tgid, idea is to mimic the system headers. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-zo8hv22onidep7tm785dzxfk@git.kernel.orgSigned-off-by:
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Ingo Molnar authored
Merge tag 'perf-urgent-for-mingo-4.20-20181121' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent Pull perf/urgent fixes: - Update kernel ABI headers, one of them lead to a small change in the ioctl 'cmd' beautifier in 'perf trace' to support the new ISO7816 commands. (Arnaldo Carvalho de Melo) - Restore proper cwd on return from mnt namespace (Jiri Olsa) - Add feature check for the get_current_dir_name() function used in the namespace fix from Jiri, that is not available in systems such as Alpine Linux, which uses the musl libc (Arnaldo Carvalho de Melo) - Fix crash in 'perf record' when synthesizing the unit for events such as 'cpu-clock' (Jiri Olsa) Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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- 20 Nov, 2018 1 commit
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Peter Zijlstra authored
Kyle Huey reported that 'rr', a replay debugger, broke due to the following commit: af3bdb99 ("perf/x86/intel: Add a separate Arch Perfmon v4 PMI handler") Rework the 'disable_counter_freezing' __setup() parameter such that we can explicitly enable/disable it and switch to default disabled. To this purpose, rename the parameter to "perf_v4_pmi=" which is a much better description and allows requiring a bool argument. [ mingo: Improved the changelog some more. ] Reported-by:
Kyle Huey <me@kylehuey.com> Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Robert O'Callahan <robert@ocallahan.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: acme@kernel.org Link: http://lkml.kernel.org/r/20181120170842.GZ2131@hirez.programming.kicks-ass.netSigned-off-by:
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- 19 Nov, 2018 6 commits
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Arnaldo Carvalho de Melo authored
Introduced in: ad8c0eaa ("tty/serial_core: add ISO7816 infrastructure") Now 'perf trace' will be able to pretty-print the 'cmd' ioctl arg when used in capable systems with software emitting those commands. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Nicolas Ferre <nicolas.ferre@microchip.com> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-7bds48dhckfnleie08mit314@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
To pick up the changes in: ad8c0eaa ("tty/serial_core: add ISO7816 infrastructure") That is a change that imply a change to be made in tools/perf/trace/beauty/ioctl.c to make 'perf trace' ioctl syscall argument beautifier to support these new commands: TIOCGISO7816 and TIOCSISO7816. This is not yet done automatically by a script like is done for some other headers, for instance: $ tools/perf/trace/beauty/drm_ioctl.sh | head #ifndef DRM_COMMAND_BASE #define DRM_COMMAND_BASE 0x40 #endif static const char *drm_ioctl_cmds[] = { [0x00] = "VERSION", [0x01] = "GET_UNIQUE", [0x02] = "GET_MAGIC", [0x03] = "IRQ_BUSID", [0x04] = "GET_MAP", [0x05] = "GET_CLIENT", $ So we will need to change tools/perf/trace/beauty/ioctl.c in a follow up patch until we switch to a generator script. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Nicolas Ferre <nicolas.ferre@microchip.com> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-zin76fe6iykqsilvo6u47f9o@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
To get the changes in the following csets: ace6485a ("x86/cpufeatures: Enumerate MOVDIR64B instruction") 33823f4d ("x86/cpufeatures: Enumerate MOVDIRI instruction") No tools were affected, copy it to silence this perf tool build warning: Warning: Kernel ABI header at 'tools/arch/x86/include/asm/cpufeatures.h' differs from latest version at 'arch/x86/include/asm/cpufeatures.h' diff -u tools/arch/x86/include/asm/cpufeatures.h arch/x86/include/asm/cpufeatures.h Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Link: https://lkml.kernel.org/n/tip-83kcyqa1qkxkhm1s7q3hbpel@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
To pick up the changes in: 900ccf30 ("drm/i915: Only force GGTT coherency w/a on required chipsets") No changes are required in tools/ nor does anything gets automatically generated to be used in the 'perf trace' syscall arg beautifiers. This silences this perf build warning: Warning: Kernel ABI header at 'tools/include/uapi/drm/i915_drm.h' differs from latest version at 'include/uapi/drm/i915_drm.h' diff -u tools/include/uapi/drm/i915_drm.h include/uapi/drm/i915_drm.h Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-t2vor2wegv41gt5n49095kly@git.kernel.orgSigned-off-by:
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Jiri Olsa authored
When reporting on 'record' server we try to retrieve/use the mnt namespace of the profiled tasks. We use following API with cookie to hold the return namespace, roughly: nsinfo__mountns_enter(struct nsinfo *nsi, struct nscookie *nc) setns(newns, 0); ... new ns related open.. ... nsinfo__mountns_exit(struct nscookie *nc) setns(nc->oldns) Once finished we setns to old namespace, which also sets the current working directory (cwd) to "/", trashing the cwd we had. This is mostly fine, because we use absolute paths almost everywhere, but it screws up 'perf diff': # perf diff failed to open perf.data: No such file or directory (try 'perf record' first) ... Adding the current working directory to be part of the cookie and restoring it in the nsinfo__mountns_exit call. Signed-off-by: -
Arnaldo Carvalho de Melo authored
As the namespace support code will use this, which is not available in some non _GNU_SOURCE libraries such as Android's bionic used in my container build tests (r12b and r15c at the moment). Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-x56ypm940pwclwu45d7jfj47@git.kernel.orgSigned-off-by:
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- 18 Nov, 2018 14 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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