Re: Memory Management

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

Neil Horman wrote:

>On Sun, Jul 24, 2005 at 10:40:19PM -0300, Márcio Oliveira wrote:
>  
>
>>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 honestly have no idea.  Suffice it to say, I never build out of the
>kernel-source package.  Better to use the kernel src rpm, do an rpmbuild -bp on
>the kernel src rpm, setting your target arch accordingly.  I have no problems
>with that on any RHEL kernels.
>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.
>>    
>>
>
>  
>
Neil,

  Can I increase the number of pages in Zone_NORMAL using RHEL 3 
hugemem kernel?

Thanks.

Márcio.