Eric Lee / smarc-fsl-linux-kernel

19 May, 2020

1 commit

  • 59929cd1f   samples, bpf: Refactor kprobe, tail call kern progs map definition ... Browse Code »

    Because the previous two commit replaced the bpf_load implementation of
    the user program with libbpf, the corresponding kernel program's MAP
    definition can be replaced with new BTF-defined map syntax.

    This commit only updates the samples which uses libbpf API for loading
    bpf program not with bpf_load.

    Signed-off-by: Daniel T. Lee
    Signed-off-by: Daniel Borkmann
    Acked-by: Yonghong Song
    Link: https://lore.kernel.org/bpf/20200516040608.1377876-6-danieltimlee@gmail.com

    Daniel T. Lee
     

21 Jan, 2020

1 commit

  • 7cf245a37   samples/bpf: Use consistent include paths for libbpf ... Browse Code »

    Fix all files in samples/bpf to include libbpf header files with the bpf/
    prefix, to be consistent with external users of the library. Also ensure
    that all includes of exported libbpf header files (those that are exported
    on 'make install' of the library) use bracketed includes instead of quoted.

    To make sure no new files are introduced that doesn't include the bpf/
    prefix in its include, remove tools/lib/bpf from the include path entirely,
    and use tools/lib instead.

    Fixes: 6910d7d3867a ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir")
    Signed-off-by: Toke Høiland-Jørgensen
    Signed-off-by: Alexei Starovoitov
    Acked-by: Jesper Dangaard Brouer
    Acked-by: Andrii Nakryiko
    Link: https://lore.kernel.org/bpf/157952560911.1683545.8795966751309534150.stgit@toke.dk

    Toke Høiland-Jørgensen
     

09 Oct, 2019

1 commit

07 Apr, 2016

1 commit

  • 138d6153a   samples/bpf: Enable powerpc support ... Browse Code »

    Add the necessary definitions for building bpf samples on ppc.

    Since ppc doesn't store function return address on the stack, modify how
    PT_REGS_RET() and PT_REGS_FP() work.

    Also, introduce PT_REGS_IP() to access the instruction pointer.

    Cc: Alexei Starovoitov
    Cc: Daniel Borkmann
    Cc: David S. Miller
    Cc: Ananth N Mavinakayanahalli
    Cc: Michael Ellerman
    Signed-off-by: Naveen N. Rao
    Acked-by: Alexei Starovoitov
    Signed-off-by: David S. Miller

    Naveen N. Rao
     

09 Jul, 2015

1 commit

02 Apr, 2015

1 commit

  • 9811e3535   samples/bpf: Add kmem_alloc()/free() tracker tool ... Browse Code »

    One BPF program attaches to kmem_cache_alloc_node() and
    remembers all allocated objects in the map.
    Another program attaches to kmem_cache_free() and deletes
    corresponding object from the map.

    User space walks the map every second and prints any objects
    which are older than 1 second.

    Usage:

    $ sudo tracex4

    Then start few long living processes. The 'tracex4' will print
    something like this:

    obj 0xffff880465928000 is 13sec old was allocated at ip ffffffff8105dc32
    obj 0xffff88043181c280 is 13sec old was allocated at ip ffffffff8105dc32
    obj 0xffff880465848000 is 8sec old was allocated at ip ffffffff8105dc32
    obj 0xffff8804338bc280 is 15sec old was allocated at ip ffffffff8105dc32

    $ addr2line -fispe vmlinux ffffffff8105dc32
    do_fork at fork.c:1665

    As soon as processes exit the memory is reclaimed and 'tracex4'
    prints nothing.

    Similar experiment can be done with the __kmalloc()/kfree() pair.

    Signed-off-by: Alexei Starovoitov
    Cc: Andrew Morton
    Cc: Arnaldo Carvalho de Melo
    Cc: Arnaldo Carvalho de Melo
    Cc: Daniel Borkmann
    Cc: David S. Miller
    Cc: Jiri Olsa
    Cc: Linus Torvalds
    Cc: Masami Hiramatsu
    Cc: Namhyung Kim
    Cc: Peter Zijlstra
    Cc: Peter Zijlstra
    Cc: Steven Rostedt
    Link: http://lkml.kernel.org/r/1427312966-8434-10-git-send-email-ast@plumgrid.com
    Signed-off-by: Ingo Molnar

    Alexei Starovoitov