Messages in this thread | | | Date | Sun, 17 May 2020 23:18:36 -0700 | From | Christoph Hellwig <> | Subject | Re: [PATCH v12 00/18] Enable FSGSBASE instructions |
| |
On Mon, May 11, 2020 at 12:52:53AM -0400, Sasha Levin wrote: > 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 can > use these instructions with a %cr4 control bit. > > In addition to benefits to applications, performance improvements to the > OS context switch code are possible by making use of these instructions. A > third party reported out promising performance numbers out of their > initial benchmarking of the previous version of this patch series [9].
The [9] reference can't be resolved anywhere in this mail.
| |