Messages in this thread | | | Date | Sun, 20 Dec 2009 22:31:12 -0800 | From | "H. Peter Anvin" <> | Subject | Re: BUG: different symbol address between System.map and /proc/kallsyms |
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On 12/20/2009 05:20 PM, Xiao Guangrong wrote: > Hi, > > The symbol address in System.map and /proc/kallsys is different: > > # cat System.map | grep _text > c1000000 T _text > # cat /proc/kallsyms | grep _text > c0100000 T _text > > # readelf -s vmlinux | grep _text > 35078: c1000000 0 NOTYPE GLOBAL DEFAULT 1 _text > > So, perf can't get sysmbol address properly: > > # ./perf report > # Samples: 29 > # > # Overhead Command Shared Object Symbol > # ........ ....... ................... ...... > # > 93.10% sleep c014f988 [k] 0x000000c014f988 > 3.45% sleep libc-2.9.90.so [.] _int_malloc > 3.45% sleep [kernel] [k] 0x000000c014f988
That is normal if you have a relocatable kernel which has been loaded at the non-compile-time default address.
-hpa
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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