在 2016/11/16 18:23, Peter Zijlstra 写道:
On Wed, Nov 16, 2016 at 12:19:09PM +0800, Pan Xinhui wrote:
Hi, Peter.
I think we can avoid a function call in a simpler way. How about below
static inline bool vcpu_is_preempted(int cpu)
{
/* only set in pv case*/
if
在 2016/11/16 18:23, Peter Zijlstra 写道:
On Wed, Nov 16, 2016 at 12:19:09PM +0800, Pan Xinhui wrote:
Hi, Peter.
I think we can avoid a function call in a simpler way. How about below
static inline bool vcpu_is_preempted(int cpu)
{
/* only set in pv case*/
if
On Wed, Nov 16, 2016 at 12:29:44PM +0100, Christian Borntraeger wrote:
> On 11/16/2016 11:23 AM, Peter Zijlstra wrote:
> > On Wed, Nov 16, 2016 at 12:19:09PM +0800, Pan Xinhui wrote:
> >> Hi, Peter.
> >>I think we can avoid a function call in a simpler way. How about below
> >>
> >> static
On Wed, Nov 16, 2016 at 12:29:44PM +0100, Christian Borntraeger wrote:
> On 11/16/2016 11:23 AM, Peter Zijlstra wrote:
> > On Wed, Nov 16, 2016 at 12:19:09PM +0800, Pan Xinhui wrote:
> >> Hi, Peter.
> >>I think we can avoid a function call in a simpler way. How about below
> >>
> >> static
On 11/16/2016 11:23 AM, Peter Zijlstra wrote:
> On Wed, Nov 16, 2016 at 12:19:09PM +0800, Pan Xinhui wrote:
>> Hi, Peter.
>> I think we can avoid a function call in a simpler way. How about below
>>
>> static inline bool vcpu_is_preempted(int cpu)
>> {
>> /* only set in pv case*/
>>
On 11/16/2016 11:23 AM, Peter Zijlstra wrote:
> On Wed, Nov 16, 2016 at 12:19:09PM +0800, Pan Xinhui wrote:
>> Hi, Peter.
>> I think we can avoid a function call in a simpler way. How about below
>>
>> static inline bool vcpu_is_preempted(int cpu)
>> {
>> /* only set in pv case*/
>>
On Wed, Nov 16, 2016 at 12:19:09PM +0800, Pan Xinhui wrote:
> Hi, Peter.
> I think we can avoid a function call in a simpler way. How about below
>
> static inline bool vcpu_is_preempted(int cpu)
> {
> /* only set in pv case*/
> if (pv_lock_ops.vcpu_is_preempted)
>
On Wed, Nov 16, 2016 at 12:19:09PM +0800, Pan Xinhui wrote:
> Hi, Peter.
> I think we can avoid a function call in a simpler way. How about below
>
> static inline bool vcpu_is_preempted(int cpu)
> {
> /* only set in pv case*/
> if (pv_lock_ops.vcpu_is_preempted)
>
在 2016/11/15 23:47, Peter Zijlstra 写道:
On Wed, Nov 02, 2016 at 05:08:33AM -0400, Pan Xinhui wrote:
diff --git a/arch/x86/include/asm/paravirt_types.h
b/arch/x86/include/asm/paravirt_types.h
index 0f400c0..38c3bb7 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++
在 2016/11/15 23:47, Peter Zijlstra 写道:
On Wed, Nov 02, 2016 at 05:08:33AM -0400, Pan Xinhui wrote:
diff --git a/arch/x86/include/asm/paravirt_types.h
b/arch/x86/include/asm/paravirt_types.h
index 0f400c0..38c3bb7 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++
On Wed, Nov 02, 2016 at 05:08:33AM -0400, Pan Xinhui wrote:
> diff --git a/arch/x86/include/asm/paravirt_types.h
> b/arch/x86/include/asm/paravirt_types.h
> index 0f400c0..38c3bb7 100644
> --- a/arch/x86/include/asm/paravirt_types.h
> +++ b/arch/x86/include/asm/paravirt_types.h
> @@ -310,6 +310,8
On Wed, Nov 02, 2016 at 05:08:33AM -0400, Pan Xinhui wrote:
> diff --git a/arch/x86/include/asm/paravirt_types.h
> b/arch/x86/include/asm/paravirt_types.h
> index 0f400c0..38c3bb7 100644
> --- a/arch/x86/include/asm/paravirt_types.h
> +++ b/arch/x86/include/asm/paravirt_types.h
> @@ -310,6 +310,8
This is to fix some lock holder preemption issues. Some other locks
implementation do a spin loop before acquiring the lock itself.
Currently kernel has an interface of bool vcpu_is_preempted(int cpu). It
takes the cpu as parameter and return true if the cpu is preempted.
Then kernel can break the
This is to fix some lock holder preemption issues. Some other locks
implementation do a spin loop before acquiring the lock itself.
Currently kernel has an interface of bool vcpu_is_preempted(int cpu). It
takes the cpu as parameter and return true if the cpu is preempted.
Then kernel can break the
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