On Wed, 8 May 2013, Marc Zyngier wrote: > Hi Stefano, > > On 08/05/13 16:41, Stefano Stabellini wrote: > > Introduce CONFIG_PARAVIRT and PARAVIRT_TIME_ACCOUNTING on ARM. > > > > The only paravirt interface supported is pv_time_ops.steal_clock, so no > > runtime pvops patching needed. > > > > This allows us to make use of steal_account_process_tick for stolen > > ticks accounting. > > > > Changes in v3: > > - improve commit description and Kconfig help text; > > - no need to initialize pv_time_ops; > > - add PARAVIRT_TIME_ACCOUNTING. > > > > Signed-off-by: Stefano Stabellini <[email protected]> > > CC: [email protected] > > CC: [email protected] > > CC: [email protected] > > CC: [email protected] > > CC: [email protected] > > CC: [email protected] > > CC: [email protected] > > --- > > arch/arm/Kconfig | 20 ++++++++++++++++++++ > > arch/arm/include/asm/paravirt.h | 19 +++++++++++++++++++ > > arch/arm/kernel/Makefile | 1 + > > arch/arm/kernel/paravirt.c | 25 +++++++++++++++++++++++++ > > 4 files changed, 65 insertions(+), 0 deletions(-) > > create mode 100644 arch/arm/include/asm/paravirt.h > > create mode 100644 arch/arm/kernel/paravirt.c > > > > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig > > index 344e299..89ee2f1 100644 > > --- a/arch/arm/Kconfig > > +++ b/arch/arm/Kconfig > > @@ -1887,12 +1887,32 @@ config XEN_DOM0 > > def_bool y > > depends on XEN > > > > +config PARAVIRT > > + bool "Enable paravirtualization code" > > + ---help--- > > + This changes the kernel so it can modify itself when it is run > > + under a hypervisor, potentially improving performance significantly > > + over full virtualization. > > + > > +config PARAVIRT_TIME_ACCOUNTING > > + bool "Paravirtual steal time accounting" > > + select PARAVIRT > > Surely you meant "depends on" instead of "select" here? Otherwise I > don't really see the point of PARAVIRT...
I agree with you that "depends on" seems to be the right thing here, but on x86 is actually select. The original commit is 095c0aa83e52d6c3dd7168610746703921f570af. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
