Eric Lee / smarc-fsl-linux-kernel

25 Dec, 2017

1 commit

  • 8af220c9e   x86/unwind: Rename unwinder config options to 'CONFIG_UNWINDER_*' ... Browse Code »

    commit 11af847446ed0d131cf24d16a7ef3d5ea7a49554 upstream.

    Rename the unwinder config options from:

    CONFIG_ORC_UNWINDER
    CONFIG_FRAME_POINTER_UNWINDER
    CONFIG_GUESS_UNWINDER

    to:

    CONFIG_UNWINDER_ORC
    CONFIG_UNWINDER_FRAME_POINTER
    CONFIG_UNWINDER_GUESS

    ... in order to give them a more logical config namespace.

    Suggested-by: Ingo Molnar
    Signed-off-by: Josh Poimboeuf
    Cc: Linus Torvalds
    Cc: Peter Zijlstra
    Cc: Thomas Gleixner
    Link: http://lkml.kernel.org/r/73972fc7e2762e91912c6b9584582703d6f1b8cc.1507924831.git.jpoimboe@redhat.com
    Signed-off-by: Ingo Molnar
    Signed-off-by: Greg Kroah-Hartman

    Josh Poimboeuf
     

26 Jul, 2017

1 commit

  • ee9f8fce9   x86/unwind: Add the ORC unwinder ... Browse Code »

    Add the new ORC unwinder which is enabled by CONFIG_ORC_UNWINDER=y.
    It plugs into the existing x86 unwinder framework.

    It relies on objtool to generate the needed .orc_unwind and
    .orc_unwind_ip sections.

    For more details on why ORC is used instead of DWARF, see
    Documentation/x86/orc-unwinder.txt - but the short version is
    that it's a simplified, fundamentally more robust debugninfo
    data structure, which also allows up to two orders of magnitude
    faster lookups than the DWARF unwinder - which matters to
    profiling workloads like perf.

    Thanks to Andy Lutomirski for the performance improvement ideas:
    splitting the ORC unwind table into two parallel arrays and creating a
    fast lookup table to search a subset of the unwind table.

    Signed-off-by: Josh Poimboeuf
    Cc: Andy Lutomirski
    Cc: Borislav Petkov
    Cc: Brian Gerst
    Cc: Denys Vlasenko
    Cc: H. Peter Anvin
    Cc: Jiri Slaby
    Cc: Linus Torvalds
    Cc: Mike Galbraith
    Cc: Peter Zijlstra
    Cc: Thomas Gleixner
    Cc: live-patching@vger.kernel.org
    Link: http://lkml.kernel.org/r/0a6cbfb40f8da99b7a45a1a8302dc6aef16ec812.1500938583.git.jpoimboe@redhat.com
    [ Extended the changelog. ]
    Signed-off-by: Ingo Molnar

    Josh Poimboeuf