[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] xen: tmem: selfballooning should be enabled when xen tmem is enabled
> From: Konrad Rzeszutek Wilk > Sent: Tuesday, November 20, 2012 7:48 PM > To: Dan Magenheimer > Cc: linux-kernel@xxxxxxxxxxxxxxx; xen-devel@xxxxxxxxxxxxx > Subject: Re: [PATCH] xen: tmem: selfballooning should be enabled when xen > tmem is enabled > > On Tue, Nov 20, 2012 at 02:42:18PM -0800, Dan Magenheimer wrote: > > Konrad: Any chance this can get in for the upcoming window? > > (Or is it enough of a bug fix that it can go in at an -rcN?) > > Lets do it in the next merge window. About now I am comfortable > only with regression fixes. OK, thanks! > > It was just pointed out to me that some kernels have > > cleancache and frontswap and xen_tmem enabled but NOT > > xen_selfballooning! While this configuration should be > > possible, nearly all kernels that have CONFIG_XEN_TMEM=y should > > also have CONFIG_XEN_SELFBALLOONING=y, since Transcendent > > Memory (tmem) for Xen has very limited value without > > selfballooning. > > > > This is probably a result of a Kconfig mistake fixed I think > > by the patch below. Note that the year-old Oracle UEK2 kernel > > distro has both CONFIG_XEN_TMEM and CONFIG_XEN_SELFBALLOONING > > enabled, as does a Fedora 17 kernel update (3.6.6-1.fc17), so > > the combination should be well tested. Also, Xen tmem (and thus > > selfballooning) are currently only enabled when a kernel boot > > parameter is supplied so there is no runtime impact without > > that boot parameter. > > > > Signed-off-by: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> > > > > diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig > > index d4dffcd..b5f02f3 100644 > > --- a/drivers/xen/Kconfig > > +++ b/drivers/xen/Kconfig > > @@ -10,9 +10,9 @@ config XEN_BALLOON > > return unneeded memory to the system. > > > > config XEN_SELFBALLOONING > > - bool "Dynamically self-balloon kernel memory to target" > > - depends on XEN && XEN_BALLOON && CLEANCACHE && SWAP && XEN_TMEM > > - default n > > + bool > > + depends on XEN_BALLOON && SWAP > > + default y if XEN_TMEM > > help > > Self-ballooning dynamically balloons available kernel memory driven > > by the current usage of anonymous memory ("committed AS") and _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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