lkml.org 
[lkml]   [2016]   [Apr]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 0/3] Add support for perf user stack dump in powerpc
    On 2016/04/28 03:01PM, Chandan Kumar wrote:
    > This patch set enables perf user stack dump on powerpc

    For this patch-set:
    Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>

    I suppose that implies my testing, but nonetheless:
    Tested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>

    >
    > Example with "ls" command as user program
    > ./perf record --call-graph=dwarf,8192 ls
    >
    > ./perf script
    > ---------8< -----
    > ..
    > ...
    > perf 12549 75938.934539: 1771 cycles:ppp:
    > 210d90 .perf_event_exec (/boot/vmlinux)
    > 34b914 .load_elf_binary (/boot/vmlinux)
    > 2dcabc .search_binary_handler (/boot/vmlinux)
    > 2dd6f0 .do_execveat_common.isra.28 (/boot/vmlinux)
    > 2ddcd8 .sys_execve (/boot/vmlinux)
    > 19258 system_call (/boot/vmlinux)

    To expand on this, with upstream libunwind
    (git://git.sv.gnu.org/libunwind.git) and with debuginfo installed:

    # ./perf record -e cycles -g --call-graph dwarf -- find . -iname
    '*linux*'
    ./tests/vmlinux-kallsyms.c
    ./tests/vmlinux-kallsyms.o
    ./tests/.vmlinux-kallsyms.o.cmd
    ./util/include/linux
    [ perf record: Woken up 2 times to write data ]
    [ perf record: Captured and wrote 0.371 MB perf.data (45 samples) ]
    # ./perf script
    <snip>
    find 23858 167788.657182: 881967 cycles:
    8e758c _cond_resched (/lib/modules/4.6.0-rc3-nnr+/build/vmlinux)
    3f83bc selinux_inode_getattr (/lib/modules/4.6.0-rc3-nnr+/build/vmlinux)
    3ee254 security_inode_getattr (/lib/modules/4.6.0-rc3-nnr+/build/vmlinux)
    3063a4 vfs_getattr (/lib/modules/4.6.0-rc3-nnr+/build/vmlinux)
    306530 vfs_fstatat (/lib/modules/4.6.0-rc3-nnr+/build/vmlinux)
    306c60 sys_newfstatat (/lib/modules/4.6.0-rc3-nnr+/build/vmlinux)
    19210 system_call (/lib/modules/4.6.0-rc3-nnr+/build/vmlinux)
    3fffa31829a8 __fxstatat64 (/usr/lib64/libc-2.17.so)
    10025ac8 fts_stat.isra.2 (/usr/bin/find)
    10027c04 fts_read (/usr/bin/find)
    10003e18 find (/usr/bin/find)
    100035ec main (/usr/bin/find)
    3fffa30a4580 generic_start_main.isra.0 (/usr/lib64/libc-2.17.so)
    3fffa30a4774 __libc_start_main (/usr/lib64/libc-2.17.so)

    <snip>


    Arnaldo, Michael,
    Can we take this through powerpc/next as well since this pretty much
    rides on the recent perf regs work?

    - Naveen

    \
     
     \ /
      Last update: 2016-04-28 16:41    [W:4.159 / U:0.696 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site