lkml.org 
[lkml]   [2024]   [Apr]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Subject[PATCHv2 0/3] uprobe: uretprobe speed up
    Date
    hi,
    as part of the effort on speeding up the uprobes [0] coming with
    return uprobe optimization by using syscall instead of the trap
    on the uretprobe trampoline.

    The speed up depends on instruction type that uprobe is installed
    and depends on specific HW type, please check patch 1 for details.

    I added extra selftests to check on registers values before and
    after uretprobe to make sure the syscall saves all the needed regs
    and that uprobe consumer can still change registers.

    Patch 1 is based on:
    https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
    probes/for-next

    and patches 2,3 are based on bpf-next/master and can be taken
    separately through bpf-next tree without patch 1.

    v2 changes:
    - reposted to proper tracing mailing list [Masami]
    - renamed selftest trigger functions [Andrii]
    - kept bpf_testmod register call pattern [Andrii]
    - added acks [Andrii/Oleg]

    thanks,
    jirka


    [0] https://lore.kernel.org/bpf/ZeCXHKJ--iYYbmLj@krava/
    ---
    Jiri Olsa (3):
    uprobe: Add uretprobe syscall to speed up return probe
    selftests/bpf: Add uretprobe syscall test for regs integrity
    selftests/bpf: Add uretprobe syscall test for regs changes

    arch/x86/entry/syscalls/syscall_64.tbl | 1 +
    arch/x86/kernel/uprobes.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
    include/linux/syscalls.h | 2 ++
    include/linux/uprobes.h | 2 ++
    include/uapi/asm-generic/unistd.h | 5 +++-
    kernel/events/uprobes.c | 18 +++++++++---
    kernel/sys_ni.c | 2 ++
    tools/include/linux/compiler.h | 4 +++
    tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c | 122 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
    tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c | 230 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    tools/testing/selftests/bpf/progs/uprobe_syscall.c | 15 ++++++++++
    11 files changed, 478 insertions(+), 6 deletions(-)
    create mode 100644 tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c
    create mode 100644 tools/testing/selftests/bpf/progs/uprobe_syscall.c

    \
     
     \ /
      Last update: 2024-04-02 11:33    [W:3.477 / U:0.004 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site