On Sun, May 10, 2020 at 05:53:19PM -0700, Andi Kleen wrote:
My interest in this is that we have a few workloads that value the
ability to access FS/GS base directly and show nice performance
Can you please share some rough numbers, Sasha?
I don't have any recent numbers around these - this
> My interest in this is that we have a few workloads that value the
> ability to access FS/GS base directly and show nice performance
Can you please share some rough numbers, Sasha?
I would expect everything that does a lot of context switches
to benefit automatically, apart from the new free
On Sat, May 09, 2020 at 06:40:02PM -0700, Dave Hansen wrote:
On 5/9/20 10:36 AM, Sasha Levin wrote:
Changes from v10:
- Rewrite the commit message for patch #1.
- Document communication/acks from userspace projects that are
potentially affected by this.
I'm glad someone's pushing this
On 5/9/20 10:36 AM, Sasha Levin wrote:
> Changes from v10:
>
> - Rewrite the commit message for patch #1.
> - Document communication/acks from userspace projects that are
>potentially affected by this.
I'm glad someone's pushing this forward. But, I'm also very curious how
you came to be
Benefits:
Currently a user process that wishes to read or write the FS/GS base must
make a system call. But recent X86 processors have added new instructions
for use in 64-bit mode that allow direct access to the FS and GS segment
base addresses. The operating system controls whether applications
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