• Aneesh Kumar K.V's avatar
    net/9p: Convert net/9p protocol dumps to tracepoints · 348b5901
    Aneesh Kumar K.V authored
    This helps in more control over debugging.
    root@qemu-img-64:~# ls /pass/123
    ls: cannot access /pass/123: No such file or directory
    root@qemu-img-64:~# cat /sys/kernel/debug/tracing/trace
    # tracer: nop
    #
    #           TASK-PID    CPU#    TIMESTAMP  FUNCTION
    #              | |       |          |         |
                  ls-1536  [001]    70.928584: 9p_protocol_dump: clnt 18446612132784021504 P9_TWALK(tag = 1)
    000: 16 00 00 00 6e 01 00 01 00 00 00 02 00 00 00 01
    010: 00 03 00 31 32 33 00 00 00 ff ff ff ff 00 00 00
    
                  ls-1536  [001]    70.928587: <stack trace>
     => trace_9p_protocol_dump
     => p9pdu_finalize
     => p9_client_rpc
     => p9_client_walk
     => v9fs_vfs_lookup
     => d_alloc_and_lookup
     => walk_component
     => path_lookupat
                  ls-1536  [000]    70.929696: 9p_protocol_dump: clnt 18446612132784021504 P9_RLERROR(tag = 1)
    000: 0b 00 00 00 07 01 00 02 00 00 00 4e 03 00 02 00
    010: 00 00 00 00 03 00 02 00 00 00 00 00 ff 43 00 00
    
                  ls-1536  [000]    70.929697: <stack trace>
     => trace_9p_protocol_dump
     => p9_client_rpc
     => p9_client_walk
     => v9fs_vfs_lookup
     => d_alloc_and_lookup
     => walk_component
     => path_lookupat
     => do_path_lookup
    Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
    Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
    348b5901
9p.h 16.3 KB