Re: [PATCH 2.6.14-rc2] fix incorrect mm->hiwater_vm and mm->hiwater_rss

[Jay Lan]

Christoph Lameter wrote:
> On Wed, 21 Sep 2005, Jay Lan wrote:
>
>
> > > 5. Please add appropriate CONFIG, dummy macros etc., so that no time
> > >   is wasted on these updates in all the vanilla systems which have no
> > >   interest in them - but maybe Christoph already has that well in hand.
> >
> > It is used in enhanced system accounting. An obvious CONFIG would be
> > CONFIG_BSD_PROCESS_ACCT.
>
>
> Right. Make all the data fields and code dependent on an appropriate 
> CONFIG_XXX macro. We talked about that a couple of weeks ago as AFAIK.
>
> I had a look at Frank's patch and it does not seem to touch the critical 
> paths. Jay: Can you verify that the changes do not affect critical paths 
> and that accounting is still working in the right way?

Frank's patch looks fine to me except one place:
diff -ru a/mm/mmap.c b/mm/mmap.c
--- a/mm/mmap.c	2005-09-21 11:07:40.000000000 +0200
+++ b/mm/mmap.c	2005-09-21 11:17:06.755572000 +0200
@@ -854,6 +854,7 @@
 		mm->stack_vm += pages;
 	if (flags & (VM_RESERVED|VM_IO))
 		mm->reserved_vm += pages;
+	update_mem_hiwater(mm);
 }
 #endif /* CONFIG_PROC_FS */

I have a question of adding this call here. 'update_mem_hiwater'
does nothing unless mm->total_vm or rss gets updated.
I do not see total_vm get updates in __vm_stat_account()?

- jay

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