On Tue, Jul 21, 2015 at 7:53 PM, Brian Gerst wrote:
> On Tue, Jul 21, 2015 at 10:12 PM, Andy Lutomirski wrote:
>> On Tue, Jul 21, 2015 at 7:01 PM, Brian Gerst wrote:
>>> On Tue, Jul 21, 2015 at 3:59 PM, Andy Lutomirski wrote:
modify_ldt has questionable locking and does not synchronize
>>>
On Tue, Jul 21, 2015 at 10:12 PM, Andy Lutomirski wrote:
> On Tue, Jul 21, 2015 at 7:01 PM, Brian Gerst wrote:
>> On Tue, Jul 21, 2015 at 3:59 PM, Andy Lutomirski wrote:
>>> modify_ldt has questionable locking and does not synchronize
>>> threads. Improve it: redesign the locking and synchroniz
On Tue, Jul 21, 2015 at 7:01 PM, Brian Gerst wrote:
> On Tue, Jul 21, 2015 at 3:59 PM, Andy Lutomirski wrote:
>> modify_ldt has questionable locking and does not synchronize
>> threads. Improve it: redesign the locking and synchronize all
>> threads' LDTs using an IPI on all modifications.
>
> W
On Tue, Jul 21, 2015 at 3:59 PM, Andy Lutomirski wrote:
> modify_ldt has questionable locking and does not synchronize
> threads. Improve it: redesign the locking and synchronize all
> threads' LDTs using an IPI on all modifications.
What does this fix? I can see sending an IPI if the LDT is
re
On Tue, Jul 21, 2015 at 5:49 PM, Andrew Cooper
wrote:
> On 22/07/2015 01:28, Andy Lutomirski wrote:
>> On Tue, Jul 21, 2015 at 5:21 PM, Andrew Cooper
>> wrote:
>>> On 22/07/2015 01:07, Andy Lutomirski wrote:
On Tue, Jul 21, 2015 at 4:38 PM, Andrew Cooper
wrote:
> On 21/07/2015 22:5
On 22/07/2015 01:28, Andy Lutomirski wrote:
> On Tue, Jul 21, 2015 at 5:21 PM, Andrew Cooper
> wrote:
>> On 22/07/2015 01:07, Andy Lutomirski wrote:
>>> On Tue, Jul 21, 2015 at 4:38 PM, Andrew Cooper
>>> wrote:
On 21/07/2015 22:53, Boris Ostrovsky wrote:
> On 07/21/2015 03:59 PM, Andy Lu
On Tue, Jul 21, 2015 at 5:21 PM, Andrew Cooper
wrote:
> On 22/07/2015 01:07, Andy Lutomirski wrote:
>> On Tue, Jul 21, 2015 at 4:38 PM, Andrew Cooper
>> wrote:
>>> On 21/07/2015 22:53, Boris Ostrovsky wrote:
On 07/21/2015 03:59 PM, Andy Lutomirski wrote:
> --- a/arch/x86/include/asm/mmu_
On 22/07/2015 01:07, Andy Lutomirski wrote:
> On Tue, Jul 21, 2015 at 4:38 PM, Andrew Cooper
> wrote:
>> On 21/07/2015 22:53, Boris Ostrovsky wrote:
>>> On 07/21/2015 03:59 PM, Andy Lutomirski wrote:
--- a/arch/x86/include/asm/mmu_context.h
+++ b/arch/x86/include/asm/mmu_context.h
@
On Tue, Jul 21, 2015 at 4:38 PM, Andrew Cooper
wrote:
> On 21/07/2015 22:53, Boris Ostrovsky wrote:
>> On 07/21/2015 03:59 PM, Andy Lutomirski wrote:
>>> --- a/arch/x86/include/asm/mmu_context.h
>>> +++ b/arch/x86/include/asm/mmu_context.h
>>> @@ -34,6 +34,44 @@ static inline void load_mm_cr4(stru
On 21/07/2015 22:53, Boris Ostrovsky wrote:
> On 07/21/2015 03:59 PM, Andy Lutomirski wrote:
>> --- a/arch/x86/include/asm/mmu_context.h
>> +++ b/arch/x86/include/asm/mmu_context.h
>> @@ -34,6 +34,44 @@ static inline void load_mm_cr4(struct mm_struct
>> *mm) {}
>> #endif
>> /*
>> + * ldt_stru
On 07/21/2015 03:59 PM, Andy Lutomirski wrote:
modify_ldt has questionable locking and does not synchronize
threads. Improve it: redesign the locking and synchronize all
threads' LDTs using an IPI on all modifications.
This will dramatically slow down modify_ldt in multithreaded
programs, but t
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