Hi Hugh, Thanks by your suggestion. I did not know that kernel 2.4.29 has changed the statm implementation. As I can see the statm implementation is different between 2.4 and 2.6.
Let me see if I can use the 2.4.29 statm idea to improve the smaps for kernel 2.6.11-rc. BR, Mauricio Lin. On Wed, 16 Feb 2005 12:00:55 +0000 (GMT), Hugh Dickins <[EMAIL PROTECTED]> wrote: > On Wed, 16 Feb 2005, Mauricio Lin wrote: > > Well, for each vma it is checked how many pages are mapped to rss. So > > I have to check per page if it is allocated in physical memory. I know > > that this is a heavy function, but do you have any suggestion to > > improve this? What do you mean "needs refactoring into pgd_range, > > pud_range, pmd_range, pte_range levels like 2.4's statm"? Could you > > give more details, please? > > Just look at, say, linux-2.4.29/fs/proc/array.c proc_pid_statm: > which calls statm_pgd_range which calls statm_pmd_range which > calls statm_pte_range which scans along the array of ptes doing > the pte examination you're doing. There are plenty of examples > in 2.6.11-rc mm/memory.c of how to do it with pud level too. > > Whereas your way starts at the top and descends the tree each time > for every leaf, repeatedly mapping and unmapping the page table if > that pagetable is in highmem. You took follow_page as your starting > point, which is good for a single pte, but inefficient for many. > > Your function(s) will still be heavyweight, but somewhat faster. > > Hugh > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
