Re: Memory Management

["Márcio Oliveira" <moliveira@latinsourcetech.com>]

Neil Horman wrote:

>On Sat, Jul 23, 2005 at 08:16:20PM -0300, Márcio Oliveira wrote:
>  
>
>>Neil,
>>
>>    
>>
>>>The best way I can think to do that is take a look at /proc/slabinfo.  
>>>That will
>>>likely give you a pointer to which area of code is eating up your memory.
>>>
>>>
>>>      
>>>
>>OK. I will monitor the /proc/slabinfo file.
>>
>>    
>>
>>>Based on the sysrq-m info you posted it looks like due to fragmentation the
>>>largest chunk of memory you can allocate is 2MB (perhaps less depending on
>>>address space availability).  If you can build a test kernel to do a 
>>>show_state
>>>rather than a show_mem at the beginning of oom_kil, then you should be 
>>>able to
>>>tell who is trying to do an allocation that leads to kswapd calling
>>>out_of_memory.
>>>
>>>
>>>      
>>>
>>Neil, I'm trying to recompile the kernel source 2.4.21-32.0.1 and get 
>>some error messages:
>>
>>In file included from 
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/prefetch.h:13,
>>                from 
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/list.h:6,
>>                from 
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:12,
>>                from 3w-xxxx.c:172:
>>/usr/src/linux-2.4.21-32.0.1.EL/include/asm/processor.h:61: warning: 
>>parameter names (without types) in function declaration
>>/usr/src/linux-2.4.21-32.0.1.EL/include/asm/processor.h:61: field 
>>`loops_per_jiffy_R_ver_str' declared as a function
>>/usr/src/linux-2.4.21-32.0.1.EL/include/asm/processor.h:84: invalid 
>>suffix on integer constant
>>/usr/src/linux-2.4.21-32.0.1.EL/include/asm/processor.h:84: syntax error 
>>before numeric constant
>>/usr/src/linux-2.4.21-32.0.1.EL/include/asm/processor.h:84: warning: 
>>function declaration isn't a prototype
>>/usr/src/linux-2.4.21-32.0.1.EL/include/asm/processor.h:269: invalid 
>>suffix on integer constant
>>/usr/src/linux-2.4.21-32.0.1.EL/include/asm/processor.h:269: syntax 
>>error before numeric constant
>>/usr/src/linux-2.4.21-32.0.1.EL/include/asm/processor.h:269: warning: 
>>function declaration isn't a prototype
>>/usr/src/linux-2.4.21-32.0.1.EL/include/asm/processor.h:273: warning: 
>>parameter names (without types) in function declaration
>>In file included from 3w-xxxx.c:172:
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:190: invalid 
>>suffix on integer constant
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:190: syntax error 
>>before numeric constant
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:190: 
>>`inter_module_register_R_ver_str' declared as function returning a function
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:190: warning: 
>>function declaration isn't a prototype
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:191: invalid 
>>suffix on integer constant
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:191: syntax error 
>>before numeric constant
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:191: 
>>`inter_module_unregister_R_ver_str' declared as function returning a 
>>function
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:191: warning: 
>>function declaration isn't a prototype
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:192: 
>>`inter_module_get_R_ver_str' declared as function returning a function
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:192: warning: 
>>parameter names (without types) in function declaration
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:193: 
>>`inter_module_get_request_R_ver_str' declared as function returning a 
>>function
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:193: warning: 
>>parameter names (without types) in function declaration
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:194: invalid 
>>suffix on integer constant
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:194: syntax error 
>>before numeric constant
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:194: 
>>`inter_module_put_R_ver_str' declared as function returning a function
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:194: warning: 
>>function declaration isn't a prototype
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:203: 
>>`try_inc_mod_count_R_ver_str' declared as function returning a function
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h:203: warning: 
>>parameter names (without types) in function declaration
>>make[3]: *** [3w-xxxx_10200033.o] Error 1
>>make[3]: Leaving directory 
>>`/usr/src/linux-2.4.21-32.0.1.EL/drivers/addon/3w-xxxx_10200033'
>>make[2]: *** [_modsubdir_3w-xxxx_10200033] Error 2
>>make[2]: Leaving directory `/usr/src/linux-2.4.21-32.0.1.EL/drivers/addon'
>>make[1]: *** [_modsubdir_addon] Error 2
>>make[1]: Leaving directory `/usr/src/linux-2.4.21-32.0.1.EL/drivers'
>>make: *** [_mod_drivers] Error 2
>>
>>Is there any relationship between the sysrq-m changes to do show_state() 
>>rather than a show_mem() and the compiling erros?
>>
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/prefetch.h, line 13:
>>   #include <asm/processor.h>
>>
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/list.h ,line 6:
>>   #include <linux/prefetch.h>
>>
>>/usr/src/linux-2.4.21-32.0.1.EL/include/linux/module.h, line 12:
>>   #include <linux/list.h>
>>
>>3w-xxxx.c, line 172:
>>   #include <linux/module.h>
>>
>>Any ideia about the kernel compiling erros?
>>
>>(If I try to recompile a kernel.org kernel, it is compiled fine).
>>
>>Thanks again.
>>
>>Márcio.
>>
>>    
>>
>I honestly don't know.  I expect you haven't patched something correctly, have
>you built the source tree with rpmbuild, or are you just extracting the tar file
>from the rpm?
>Neil
>
>  
>
     I'm using the kernel-source package and trying to compiling the 
source (in /usr/src/linux-2.4 directory) with "make config", "make dep", 
"make clean", "make bzImage", "make modules" and "make 
modules_install".  I also try to compile a RHEL3 kernel-source without 
the sysrq-m changes on other RHEL3 systems and get the same errors...

    If I try to compile a kernel source provide by kernel.org, I don't 
get the errors above, and the kernel compile works. When I try to 
compile the RHEL3 kernel-source, the "make config", "make dep", "make 
clean" and "make bzImage" commands works fine but when I run "make 
modules" command I get the errors above. I think that is some issue with 
the RHEL3 kernel-source package because other kernel sources (not Red 
Hat kernel) compile without problems.

   I will try to compile the kernel using rpmbuild and check the 
results, plus the slabinfo informations.

Thanks again,

Márcio.