Re: [NUMA x86_64] problem accessing global Node List pgdat_list

[Eric Dumazet]

Hi Devesh

devesh sharma a écrit :
> Hi all,
> On an dual opteron machine and 2.6.9 kernel, I am accessing the global
> node list pgdat_list but I am not getting the desired results
>
> #include<linux/module.h>
> #include<linux/config.h>
> #include<linux/kernel.h>
> #include<linux/mmzone.h>
>
> struct pglist_data *pgdat_list ;

What are you doing here ? You declare a local variable on this module.
You should instead write :

extern struct pglist_data *pgdat_list ;
(But it seems already declared in mmzone.h)

But pgdat_list is an exported symbol of linux kernel : a module cannot access it.

So I suspect you will have to add in mm/page_alloc.c  (and recompile your kernel)

EXPORT_SYMBOL(pgdat_list);


And please use a recent kernel (2.6.13 at least) or few people will answer you.


> int init_module( void )
> {
>
>   pg_data_t *pg_dat ;
>
>   printk ("<1>****Module initialized to retrive the information of
> pgdat_list list in the Kernel****\n" ) ;
>
>
>   for_each_pgdat(pg_dat)
>   {
>     printk ("<1>The number of zones on this node are %x\n", pg_dat ->
> nr_zones ) ;
>
>     printk ("<1>The Node Id of this node is %d\n", pg_dat -> node_id ) ;
>
>   }
>
>   return 0 ;
> }
>
> void cleanup_module ( void )
> {
>     printk ("<1>********Module Exiting***********\n" ) ;
> }
>
> MODULE_LICENSE("GPL") ;
>
> How I can access this list any body tell me the solution.

Eric


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