• A
    perf tools: Cross platform perf.data analysis support · ba21594c
    Arnaldo Carvalho de Melo 提交于
    There are still some problems related to loading vmlinux files,
    but those are unrelated to the feature implemented in this
    patch, so will get fixed in the next patches, but here are some
    results:
    
    1. collect perf.data file on a Fedora 12 machine, x86_64, 64-bit
    userland
    
    2. transfer it to a Debian Testing machine, PARISC64, 32-bit
    userland
    
      acme@parisc:~/git/linux-2.6-tip$ perf buildid-list | head -5
      74f9930ee94475b6b3238caf3725a50d59cb994b [kernel.kallsyms]
      55fdd56670453ea66c011158c4b9d30179c1d049 /lib/modules/2.6.33-rc4-tip+/kernel/net/ipv4/netfilter/ipt_MASQUERADE.ko
      41adff63c730890480980d5d8ba513f1c216a858 /lib/modules/2.6.33-rc4-tip+/kernel/net/ipv4/netfilter/iptable_nat.ko
      90a33def1077bb8e97b8a78546dc96c2de62df46 /lib/modules/2.6.33-rc4-tip+/kernel/net/ipv4/netfilter/nf_nat.ko
      984c7bea90ce1376d5c8e7ef43a781801286e62d /lib/modules/2.6.33-rc4-tip+/kernel/drivers/net/tun.ko
    
      acme@parisc:~/git/linux-2.6-tip$ perf buildid-list | tail -5
      22492f3753c6a67de5c7ccbd6b863390c92c0723 /usr/lib64/libXt.so.6.0.0
      353802bb7e1b895ba43507cc678f951e778e4c6f /usr/lib64/libMagickCore.so.2.0.0
      d10c2897558595efe7be8b0584cf7e6398bc776c /usr/lib64/libfprint.so.0.0.0
      a83ecfb519a788774a84d5ddde633c9ba56c03ab /home/acme/bin/perf
      d3ca765a8ecf257d263801d7ad8c49c189082317 /usr/lib64/libdwarf.so.0.0
      acme@parisc:~/git/linux-2.6-tip$
    
      acme@parisc:~/git/linux-2.6-tip$ perf report --sort comm
      The file [kernel.kallsyms] cannot be used, trying to use /proc/kallsyms...
    
      ^^^^ The problem related to vmlinux handling, it shouldn't be trying this
      ^^^^ rather alien /proc/kallsyms at all...
    
      /lib64/libpthread-2.10.2.so with build id 5c68f7afeb33309c78037e374b0deee84dd441f6 not found, continuing without symbols
      /lib64/libc-2.10.2.so with build id eb4ec8fa8b2a5eb18cad173c92f27ed8887ed1c1 not found, continuing without symbols
      /home/acme/bin/perf with build id a83ecfb519a788774a84d5ddde633c9ba56c03ab not found, continuing without symbols
      /usr/sbin/openvpn with build id f2037a091ef36b591187a858d75e203690ea9409 not found, continuing without symbols
      Failed to open /lib/modules/2.6.33-rc4-tip+/kernel/drivers/net/e1000e/e1000e.ko, continuing without symbols
      Failed to open /lib/modules/2.6.33-rc4-tip+/kernel/drivers/net/wireless/iwlwifi/iwlcore.ko, continuing without symbols
    
      <SNIP more complaints about not finding the right build-ids,
            those will have to wait for 'perf archive' or plain
            copying what was collected by 'perf record' on the x86_64,
            source machine, see further below for an example of this >
    
      # Samples: 293085637
      #
      # Overhead          Command
      # ........  ...............
      #
          61.70%             find
          23.50%             perf
           5.86%          swapper
           3.12%             sshd
           2.39%             init
           0.87%             bash
           0.86%            sleep
           0.59%      dbus-daemon
           0.25%             hald
           0.24%   NetworkManager
           0.19%  hald-addon-rfki
           0.15%          openvpn
           0.07%             phy0
           0.07%         events/0
           0.05%          iwl3945
           0.05%         events/1
           0.03%      kondemand/0
      acme@parisc:~/git/linux-2.6-tip$
    
    Which matches what we get when running the same command for the
    same perf.data file on the F12, x86_64, source machine:
    
      [root@doppio linux-2.6-tip]# perf report --sort comm
      # Samples: 293085637
      #
      # Overhead          Command
      # ........  ...............
      #
          61.70%             find
          23.50%             perf
           5.86%          swapper
           3.12%             sshd
           2.39%             init
           0.87%             bash
           0.86%            sleep
           0.59%      dbus-daemon
           0.25%             hald
           0.24%   NetworkManager
           0.19%  hald-addon-rfki
           0.15%          openvpn
           0.07%             phy0
           0.07%         events/0
           0.05%          iwl3945
           0.05%         events/1
           0.03%      kondemand/0
      [root@doppio linux-2.6-tip]#
    
    The other modes work as well, modulo the problem with vmlinux:
    
      acme@parisc:~/git/linux-2.6-tip$ perf report --sort comm,dso 2> /dev/null | head -15
      # Samples: 293085637
      #
      # Overhead          Command                      Shared Object
      # ........  ...............  .................................
      #
          35.11%             find                   ffffffff81002b5a
          18.25%             perf                   ffffffff8102235f
          16.17%             find  libc-2.10.2.so
           9.07%             find  find
           5.80%          swapper                   ffffffff8102235f
           3.95%             perf  libc-2.10.2.so
           2.33%             init                   ffffffff810091b9
           1.65%             sshd  libcrypto.so.0.9.8k
           1.35%             find  [e1000e]
           0.68%            sleep  libc-2.10.2.so
      acme@parisc:~/git/linux-2.6-tip$
    
    And the lack of the right buildids:
    
      acme@parisc:~/git/linux-2.6-tip$ perf report --sort comm,dso,symbol 2> /dev/null | head -15
      # Samples: 293085637
      #
      # Overhead          Command                      Shared Object  Symbol
      # ........  ...............  .................................  ......
      #
          35.11%             find                   ffffffff81002b5a  [k] 0xffffffff81002b5a
          18.25%             perf                   ffffffff8102235f  [k] 0xffffffff8102235f
          16.17%             find  libc-2.10.2.so                     [.] 0x00000000045782
           9.07%             find  find                               [.] 0x0000000000fb0e
           5.80%          swapper                   ffffffff8102235f  [k] 0xffffffff8102235f
           3.95%             perf  libc-2.10.2.so                     [.] 0x0000000007f398
           2.33%             init                   ffffffff810091b9  [k] 0xffffffff810091b9
           1.65%             sshd  libcrypto.so.0.9.8k                [.] 0x00000000105440
           1.35%             find  [e1000e]                           [k] 0x00000000010948
           0.68%            sleep  libc-2.10.2.so                     [.] 0x0000000011ad5b
      acme@parisc:~/git/linux-2.6-tip$
    
    But if we:
    
      acme@parisc:~/git/linux-2.6-tip$ ls ~/.debug
      ls: cannot access /home/acme/.debug: No such file or directory
      acme@parisc:~/git/linux-2.6-tip$ mkdir -p ~/.debug/lib64/libc-2.10.2.so/
      acme@parisc:~/git/linux-2.6-tip$ scp doppio:.debug/lib64/libc-2.10.2.so/* ~/.debug/lib64/libc-2.10.2.so/
      acme@doppio's password:
      eb4ec8fa8b2a5eb18cad173c92f27ed8887ed1c1	             100% 1783KB 714.7KB/s   00:02
      acme@parisc:~/git/linux-2.6-tip$ mkdir -p ~/.debug/.build-id/eb
      acme@parisc:~/git/linux-2.6-tip$ ln -s ../../lib64/libc-2.10.2.so/eb4ec8fa8b2a5eb18cad173c92f27ed8887ed1c1 ~/.debug/.build-id/eb/4ec8fa8b2a5eb18cad173c92f27ed8887ed1c1
      acme@parisc:~/git/linux-2.6-tip$ perf report --dsos libc-2.10.2.so 2> /dev/null
      # dso: libc-2.10.2.so
      # Samples: 64281170
      #
      # Overhead          Command  Symbol
      # ........  ...............  ......
      #
          14.98%             perf  [.] __GI_strcmp
          12.30%             find  [.] __GI_memmove
           9.25%             find  [.] _int_malloc
           7.60%             find  [.] _IO_vfprintf_internal
           6.10%             find  [.] _IO_new_file_xsputn
           6.02%             find  [.] __GI_close
           3.08%             find  [.] _IO_file_overflow_internal
           3.08%             find  [.] malloc_consolidate
           3.08%             find  [.] _int_free
           3.08%             find  [.] __strchrnul
           3.08%             find  [.] __getdents64
           3.08%             find  [.] __write_nocancel
           3.08%            sleep  [.] __GI__dl_addr
           3.08%             sshd  [.] __libc_select
           3.08%             find  [.] _IO_new_file_write
           3.07%             find  [.] _IO_new_do_write
           3.06%             find  [.] __GI___errno_location
           3.05%             find  [.] __GI___libc_malloc
           3.04%             perf  [.] __GI_memcpy
           1.71%             find  [.] __fprintf_chk
           1.29%             bash  [.] __gconv_transform_utf8_internal
           0.79%      dbus-daemon  [.] __GI_strlen
      #
      # (For a higher level overview, try: perf report --sort comm,dso)
      #
      acme@parisc:~/git/linux-2.6-tip$
    
    Which matches what we get on the source, F12, x86_64 machine:
    
      [root@doppio linux-2.6-tip]# perf report --dsos libc-2.10.2.so
      # dso: libc-2.10.2.so
      # Samples: 64281170
      #
      # Overhead          Command  Symbol
      # ........  ...............  ......
      #
          14.98%             perf  [.] __GI_strcmp
          12.30%             find  [.] __GI_memmove
           9.25%             find  [.] _int_malloc
           7.60%             find  [.] _IO_vfprintf_internal
           6.10%             find  [.] _IO_new_file_xsputn
           6.02%             find  [.] __GI_close
           3.08%             find  [.] _IO_file_overflow_internal
           3.08%             find  [.] malloc_consolidate
           3.08%             find  [.] _int_free
           3.08%             find  [.] __strchrnul
           3.08%             find  [.] __getdents64
           3.08%             find  [.] __write_nocancel
           3.08%            sleep  [.] __GI__dl_addr
           3.08%             sshd  [.] __libc_select
           3.08%             find  [.] _IO_new_file_write
           3.07%             find  [.] _IO_new_do_write
           3.06%             find  [.] __GI___errno_location
           3.05%             find  [.] __GI___libc_malloc
           3.04%             perf  [.] __GI_memcpy
           1.71%             find  [.] __fprintf_chk
           1.29%             bash  [.] __gconv_transform_utf8_internal
           0.79%      dbus-daemon  [.] __GI_strlen
      #
      # (For a higher level overview, try: perf report --sort comm,dso)
      #
      [root@doppio linux-2.6-tip]#
    
    So I think this is really, really nice in that it demonstrates
    the portability of perf.data files and the use of build-ids
    accross such aliens worlds :-)
    
    There are some things to fix tho, like the bitmap on the header,
    but things are looking good.
    Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Frédéric Weisbecker <fweisbec@gmail.com>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Paul Mackerras <paulus@samba.org>
    LKML-Reference: <1263478990-8200-2-git-send-email-acme@infradead.org>
    Signed-off-by: NIngo Molnar <mingo@elte.hu>
    ba21594c
session.h 1.9 KB