On Mon, 2010-08-30 at 01:13 +0200, Rafael J. Wysocki wrote:
> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.34 and 2.6.35.
> 
> The following bug entry is on the current list of known regressions
> introduced between 2.6.34 and 2.6.35.  Please verify if it still should
> be listed and let the tracking team know (either way).
> 
> 
> Bug-Entry     : http://bugzilla.kernel.org/show_bug.cgi?id=16399
> Subject               : perf failed with kernel 2.6.35-rc
> Submitter     : Zhang, Yanmin <[email protected]>
> Date          : 2010-07-13 8:14 (48 days old)
> First-Bad-Commit: 
> http://git.kernel.org/linus/1ac62cfff252fb668405ef3398a1fa7f4a0d6d15
> Message-ID    : <[email protected]>
> References    : http://marc.info/?l=linux-kernel&m=127900880212470&w=2
> 
> 

Should be fixed by:

commit 351af0725e5222e35741011d1ea62215c1ed06db
Author: Zhang, Yanmin <[email protected]>
Date:   Fri Aug 6 13:39:08 2010 +0800

    perf, x86: Fix Intel-nhm PMU programming errata workaround                  
                                                                                
      
                                                                                
                                                                                
      
    Fix the Errata AAK100/AAP53/BD53 workaround, the officialy documented       
                                                                                
      
    workaround we implemented in:                                               
                                                                                
      
                                                                                
                                                                                
      
     11164cd: perf, x86: Add Nehelem PMU programming errata workaround          
                                                                                
      
                                                                                
                                                                                
      
    doesn't actually work fully and causes a stuck PMU state                    
                                                                                
      
    under load and non-functioning perf profiling.                              
                                                                                
      
                                                                                
                                                                                
      
    A functional workaround was found by trial & error.                         
                                                                                
      
                                                                                
                                                                                
      
    Affects all Nehalem-class Intel PMUs.                                       
                                                                                
      
                                                                                
                                                                                
      
    Signed-off-by: Zhang Yanmin <[email protected]>                  
                                                                                
      
    Signed-off-by: Peter Zijlstra <[email protected]>                      
                                                                                
      
    LKML-Reference: <[email protected]>             
                                                                                
      
    Cc: Arjan van de Ven <[email protected]>                                
                                                                                
      
    Cc: "H. Peter Anvin" <[email protected]>                                       
                                                                                
       
    Cc: <[email protected]> # .35.x                                             
                                                                                
      
    Signed-off-by: Ingo Molnar <[email protected]> 
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