Re: [PATCH] add extra free kbytes tunable

[Simon Jeons]

On 03/02/2013 06:33 AM, Hugh Dickins wrote:
> On Fri, 1 Mar 2013, Simon Jeons wrote:
> > On 03/01/2013 05:22 PM, Simon Jeons wrote:
> > > On 02/23/2013 01:56 AM, Johannes Weiner wrote:
> > > > Mapped file pages have to get scanned twice before they are reclaimed
> > > > because we don't have enough usage information after the first scan.
> > > It seems that just VM_EXEC mapped file pages are protected.
> > > Issue in page reclaim subsystem:
> > > static inline int page_is_file_cache(struct page *page)
> > > {
> > >      return !PageSwapBacked(page);
> > > }
> > > AFAIK, PG_swapbacked is set if anonymous page added to swap cache, and be
> > > cleaned if removed from swap cache. So anonymous pages which are reclaimed
> > > and add to swap cache won't have this flag, then they will be treated as
> > s/are/aren't
> PG_swapbacked != PG_swapcache

Oh, I see. Thanks Hugh, thanks for your patient. :)

In function __add_to_swap_cache if add to radix tree successfully will 
result in increase NR_FILE_PAGES, why? This is anonymous page instead of 
file backed page.

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