Re: memory usage

[Samuel Thibault <samuel.thibault@ens-lyon.org>]

Samuel Thibault, le Mon 06 Aug 2007 20:45:53 +0200, a écrit :
> I've ported xosview to GNU/Hurd and had a look during a gcc compilation:
> approximately only half the memory is used.  I had a look at
> vm/vm_pageout.c and noticed:
> 
> /*      When vm_page_external_count exceeds vm_page_external_limit, 
>  *      allocations of externally paged pages stops.
>  */
> 
> #ifndef VM_PAGE_EXTERNAL_LIMIT
> #define VM_PAGE_EXTERNAL_LIMIT(free)            ((free) / 2)
> #endif  /* VM_PAGE_EXTERNAL_LIMIT */

Mmm, actually it's worse:

/*      Attempt to keep the number of externally paged pages less
 *      than vm_pages_external_target.
 */ 
#ifndef VM_PAGE_EXTERNAL_TARGET 
#define VM_PAGE_EXTERNAL_TARGET(free)           ((free) / 4) 
#endif  /* VM_PAGE_EXTERNAL_TARGET */

Samuel