Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1374138
| From | Borislav Petkov <bp@alien8.de> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v3 0/7] x86: Pile o' FS/GS changes |
| Date | 2016-04-08 12:40 +0200 |
| Message-ID | <rlBZw-2oe-5@gated-at.bofh.it> (permalink) |
| References | <rlsCT-3LP-15@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thu, Apr 07, 2016 at 05:31:43PM -0700, Andy Lutomirski wrote:
> Hi all-
>
> This whole mess is intended for x86/urgent. It fixes several bugs.
>
> It's probably a tiny performance regression on some workloads on
> Intel CPUs. It's probably varies between a less tiny regression and
> a small speedup on newer AMD CPUs. It's a bigger regression on AMD
> K8.
Shhh, otherwise the 2-3 K8 users left would crawl out of the woodwork
complaining. ;-)
> The AMD code could be further sped up by adding a new 'clear_gs'
> pvop with a better native implementation. I don't particularly want
> to deal with a backported new pvop, so I didn't do that. Maybe I'll
> do it later on for new kernels, though.
Yeah, before you do that, we should probably measure that first to see
whether it is worth the trouble and the added pvop gunk at all.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[PATCH v3 0/7] x86: Pile o' FS/GS changes Andy Lutomirski <luto@kernel.org> - 2016-04-08 02:40 +0200
[PATCH v3 1/7] selftests/x86: Test the FSBASE/GSBASE API and context switching Andy Lutomirski <luto@kernel.org> - 2016-04-08 02:40 +0200
[tip:x86/asm] selftests/x86: Test the FSBASE/GSBASE API and context switching tip-bot for Andy Lutomirski <tipbot@zytor.com> - 2016-04-13 13:40 +0200
[PATCH v3 5/7] x86/cpu: Move X86_BUG_ESPFIX initialization to generic_identify Andy Lutomirski <luto@kernel.org> - 2016-04-08 02:40 +0200
[tip:x86/asm] x86/cpu: Move X86_BUG_ESPFIX initialization to generic_identify() tip-bot for Andy Lutomirski <tipbot@zytor.com> - 2016-04-13 13:40 +0200
[PATCH v3 7/7] x86/entry: Make gs_change a local label Andy Lutomirski <luto@kernel.org> - 2016-04-08 02:40 +0200
[tip:x86/asm] x86/entry/64: Make gs_change a local label tip-bot for Borislav Petkov <tipbot@zytor.com> - 2016-04-13 13:40 +0200
Re: [PATCH v3 6/7] x86/cpu: Add Erratum 88 detection on AMD Andy Lutomirski <luto@amacapital.net> - 2016-04-08 03:50 +0200
Re: [PATCH v3 6/7] x86/cpu: Add Erratum 88 detection on AMD Borislav Petkov <bp@alien8.de> - 2016-04-08 12:00 +0200
Re: [PATCH v3 2/7] x86/arch_prctl: Fix ARCH_GET_FS and ARCH_GET_GS Ingo Molnar <mingo@kernel.org> - 2016-04-08 09:20 +0200
Re: [PATCH v3 2/7] x86/arch_prctl: Fix ARCH_GET_FS and ARCH_GET_GS Dmitry Safonov <0x7f454c46@gmail.com> - 2016-04-08 11:40 +0200
Re: [PATCH v3 2/7] x86/arch_prctl: Fix ARCH_GET_FS and ARCH_GET_GS Andy Lutomirski <luto@amacapital.net> - 2016-04-08 18:10 +0200
Re: [PATCH v3 0/7] x86: Pile o' FS/GS changes Borislav Petkov <bp@alien8.de> - 2016-04-08 12:40 +0200
Re: [PATCH v3 0/7] x86: Pile o' FS/GS changes Borislav Petkov <bp@alien8.de> - 2016-04-08 12:50 +0200
csiph-web