Re: [Xen-devel] [PATCH] x86/PoD: skip eager reclaim when possible

2016-05-12 Thread George Dunlap
On 12/05/16 16:08, Jan Beulich wrote: On 12.05.16 at 16:40, wrote: >> On 10/05/16 14:44, Jan Beulich wrote: >>> Reclaiming pages is pointless when the cache can already satisfy all >>> outstanding PoD entries, and doing reclaims in that case can be very >>> harmful to performance when that me

Re: [Xen-devel] [PATCH] x86/PoD: skip eager reclaim when possible

2016-05-12 Thread Jan Beulich
>>> On 12.05.16 at 16:40, wrote: > On 10/05/16 14:44, Jan Beulich wrote: >> Reclaiming pages is pointless when the cache can already satisfy all >> outstanding PoD entries, and doing reclaims in that case can be very >> harmful to performance when that memory gets used by the guest, but >> only to

Re: [Xen-devel] [PATCH] x86/PoD: skip eager reclaim when possible

2016-05-12 Thread George Dunlap
On 10/05/16 14:44, Jan Beulich wrote: > Reclaiming pages is pointless when the cache can already satisfy all > outstanding PoD entries, and doing reclaims in that case can be very > harmful to performance when that memory gets used by the guest, but > only to store zeroes there. > > Signed-off-by:

Re: [Xen-devel] [PATCH] x86/PoD: skip eager reclaim when possible

2016-05-10 Thread Jan Beulich
>>> On 10.05.16 at 15:50, wrote: > On 10/05/16 14:44, Jan Beulich wrote: >> Reclaiming pages is pointless when the cache can already satisfy all >> outstanding PoD entries, and doing reclaims in that case can be very >> harmful to performance when that memory gets used by the guest, but >> only to

Re: [Xen-devel] [PATCH] x86/PoD: skip eager reclaim when possible

2016-05-10 Thread Wei Liu
On Tue, May 10, 2016 at 07:49:01AM -0600, Jan Beulich wrote: > >>> On 10.05.16 at 15:44, wrote: > > Reclaiming pages is pointless when the cache can already satisfy all > > outstanding PoD entries, and doing reclaims in that case can be very > > harmful to performance when that memory gets used by

Re: [Xen-devel] [PATCH] x86/PoD: skip eager reclaim when possible

2016-05-10 Thread Andrew Cooper
On 10/05/16 14:44, Jan Beulich wrote: > Reclaiming pages is pointless when the cache can already satisfy all > outstanding PoD entries, and doing reclaims in that case can be very > harmful to performance when that memory gets used by the guest, but > only to store zeroes there. > > Signed-off-by:

Re: [Xen-devel] [PATCH] x86/PoD: skip eager reclaim when possible

2016-05-10 Thread Jan Beulich
>>> On 10.05.16 at 15:44, wrote: > Reclaiming pages is pointless when the cache can already satisfy all > outstanding PoD entries, and doing reclaims in that case can be very > harmful to performance when that memory gets used by the guest, but > only to store zeroes there. > > Signed-off-by: Jan