Re: deferred rss update instead of sloppy rss

[Andrew Morton]

Christoph Lameter <clameter@xxxxxxx> wrote:
>
> > just to prevent transient gross inaccuracies.  For some value of "16".
> 
> The page fault code only increments rss. For larger transactions that
> increase / decrease rss significantly the page_table_lock is taken and
> mm->rss is updated directly. So no
> gross inaccuracies can result.

Sure.  Take a million successive pagefaults and mm->rss is grossly
inaccurate.  Hence my suggestion that it be spilled into mm->rss
periodically.

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