Re: [PATCH 2/2] Add MSR Bitmap support in VMX

[Ulrich Drepper <drepper-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

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Nakajima, Jun wrote:
>> Looking at the Linux context switch code, it can bang on MSR_FS_BASE
> and
>> MSR_KERNEL_GS_BASE. A high context switch rate between threads (which
>> use %gs or %fs) can show an improvement with this.  Things like kbuild
>> probably won't as they use single threaded processes.
> 
> Right. 

In Linux there is no difference between single- and multi-threaded
processes when it comes to setting up segment registers.  Every x86-64
process uses %fs for TLS and every x86 process uses %gs.  There are
always variables accessed this way (errno, for instance).

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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