RE: [RFC PATCH 1/8] x86/cpufeatures: Enumerate MOVDIRI instruction

2018-06-25 Thread David Laight
From: Fenghua Yu > Sent: 19 June 2018 22:37 > To: Thomas Gleixner > Cc: Fenghua Yu; Ingo Molnar; H Peter Anvin; Ashok Raj; Alan Cox; Ravi V > Shankar; linux-kernel; x86 > Subject: Re: [RFC PATCH 1/8] x86/cpufeatures: Enumerate MOVDIRI instruction > > On Tue, Jun 19, 201

Re: [RFC PATCH 1/8] x86/cpufeatures: Enumerate MOVDIRI instruction

2018-06-19 Thread Fenghua Yu
On Wed, Jun 20, 2018 at 12:32:14AM +0200, Thomas Gleixner wrote: > On Tue, 19 Jun 2018, Fenghua Yu wrote: > > > On Tue, Jun 19, 2018 at 10:57:44AM +0200, Thomas Gleixner wrote: > > > On Fri, 15 Jun 2018, Fenghua Yu wrote: > > > > > > > MOVDIRI moves doubleword or quadword from register to memory

Re: [RFC PATCH 1/8] x86/cpufeatures: Enumerate MOVDIRI instruction

2018-06-19 Thread Thomas Gleixner
On Tue, 19 Jun 2018, Fenghua Yu wrote: > On Tue, Jun 19, 2018 at 10:57:44AM +0200, Thomas Gleixner wrote: > > On Fri, 15 Jun 2018, Fenghua Yu wrote: > > > > > MOVDIRI moves doubleword or quadword from register to memory through > > > direct store which is implemented by using write combining (WC)

Re: [RFC PATCH 1/8] x86/cpufeatures: Enumerate MOVDIRI instruction

2018-06-19 Thread Fenghua Yu
On Tue, Jun 19, 2018 at 10:57:44AM +0200, Thomas Gleixner wrote: > On Fri, 15 Jun 2018, Fenghua Yu wrote: > > > MOVDIRI moves doubleword or quadword from register to memory through > > direct store which is implemented by using write combining (WC) for > > writing data directly into memory without

Re: [RFC PATCH 1/8] x86/cpufeatures: Enumerate MOVDIRI instruction

2018-06-19 Thread Thomas Gleixner
On Fri, 15 Jun 2018, Fenghua Yu wrote: > MOVDIRI moves doubleword or quadword from register to memory through > direct store which is implemented by using write combining (WC) for > writing data directly into memory without caching the data. And that is useful for what? Thanks, tglx