Re: [PATCH] add extra free kbytes tunable

[Hugh Dickins]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/