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.

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