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xen-devel
[Xen-devel] RE: [PATCH] xen: Fix selfballooning and ensure it doesn't go
> From: Konrad Rzeszutek Wilk
> Sent: Monday, September 26, 2011 11:23 AM
> To: Dan Magenheimer
> Cc: linux-kernel@xxxxxxxxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxx; David
> Vrabel; Jeremy Fitzhardinge
> Subject: Re: [PATCH] xen: Fix selfballooning and ensure it doesn't go too far
>
> On Sat, Sep 24, 2011 at 01:58:08PM -0700, Dan Magenheimer wrote:
> > [PATCH] xen: Fix selfballooning and ensure it doesn't go too far
> >
> > The balloon driver's "current_pages" is very different from
> > totalram_pages. Self-ballooning needs to be driven by
> > the latter. Also, Committed_AS doesn't account for pages
> > used by the kernel so enforce a floor for when there
> > are little or no user-space threads using memory.
>
> Hey Dan,
> ..
> > + floor_pages = totalreserve_pages +
> > + (roundup_pow_of_two(max_pfn) >> 5);
>
> Would it make sense to make the shift be a runtime argument
> in case some users report problems with that calculation?
Good idea. I'll take a look at that.
> > + /* don't balloon too far, lest OOMs occur... */
> > + if (tgt_pages < floor_pages)
> > + tgt_pages = floor_pages;
> > + balloon_set_new_target(tgt_pages +
> > + balloon_stats.current_pages - totalram_pages);
> > reset_timer = true;
> > }
> > #ifdef CONFIG_FRONTSWAP
>
> Otherwise it looks OK to me. Would you like me to queue it up
> for 3.1-rc7?
Will let you know when I have that change done/tested.
Thanks,
Dan
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