Re: [Xen-devel] [PATCH][XEN]xm dump command add on

[Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>]

Hi, Ken

Yes, This is wrong patch.
Please see another mail.
http://lists.xensource.com/archives/html/xen-devel/2006-08/msg00901.html

Best Regards,

Akio Takebe

>Akio,
>
>Thank you for your input. Though you are using an error counter, it
>seems like you are still using it as an error status flag
>if(err_cnt!=0)...
>How is this different from simply setting 0 or -1?
>
>On Wed, 2006-08-16 at 09:53 +0900, Akio Takebe wrote:
>> Hi, Ken
>> 
>> Good work!
>> But you should check coding-style. ;-)
>> 
>> How about the following patch?
>> I think cpy_sts is always -1 or 0.
>> I think checking error counter is more worth than error status.
>> I don't test the following patch. This is RFC.
>> 
>> diff -r bef360142b62 tools/libxc/xc_core.c
>> --- a/tools/libxc/xc_core.c     Mon Aug 14 14:21:21 2006 -0600
>> +++ b/tools/libxc/xc_core.c     Wed Aug 16 09:19:08 2006 +0900
>> @@ -37,6 +37,7 @@ xc_domain_dumpcore_via_callback(int xc_h
>>      char dummy[PAGE_SIZE];
>>      int dummy_len;
>>      int sts;
>> +    int err_cnt = 0;
>>  
>>      if ( (dump_mem_start = malloc(DUMP_INCREMENT*PAGE_SIZE)) == NULL )
>>      {
>> @@ -103,7 +104,10 @@ xc_domain_dumpcore_via_callback(int xc_h
>>  
>>      for ( dump_mem = dump_mem_start, i = 0; i < nr_pages; i++ )
>>      {
>> -        copy_from_domain_page(xc_handle, domid, page_array[i], dump_mem);
>> +        sts = copy_from_domain_page(xc_handle, domid, page_array[i], 
>> dump_mem);
>> +        if ( sts != 0 )
>> +            err_cnt++;
>> +
>>          dump_mem += PAGE_SIZE;
>>          if ( ((i + 1) % DUMP_INCREMENT == 0) || ((i + 1) == nr_pages) )
>>          {
>> @@ -112,6 +116,11 @@ xc_domain_dumpcore_via_callback(int xc_h
>>                  goto error_out;
>>              dump_mem = dump_mem_start;
>>          }
>> +    }
>> +
>> +    if ( err_cnt != 0 ){
>> +        IPRINTF("Could not copy from domid=%d page\n", domid);
>> +        goto error_out;
>>      }
>>  
>>      free(dump_mem_start);
>> 
>> 
>> Best Regards,
>> 
>> Akio Takebe
>> 



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