Re: x86 system call (using sysenter) perf regression

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To: Andy Lutomirski <luto@xxxxxxxxxx>
Subject: Re: x86 system call (using sysenter) perf regression
From: vivek thakkar <vthakkar.systems@xxxxxxxxx>
Date: Tue, 13 Jul 2021 08:06:13 +0530
Cc: "the arch/x86 maintainers" <x86@xxxxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx
In-reply-to: <2c7820bf-e502-4fd6-8fae-2dbf46c94a7e@www.fastmail.com>
References: <CAFOO9hwU3oS9Z2v-uqK5U_B+Sdy-whU3rd_BcecO3ogPHmoFXA@mail.gmail.com> <2c7820bf-e502-4fd6-8fae-2dbf46c94a7e@www.fastmail.com>

> Yes. We made a conscious decision to trade a bit of performance for a lot of maintainability, especially for a legacy-ish path. The old SYSENTER code was a mess.
>

Thanks Andy.

Regards,
Vivek Thakkar

References:
- x86 system call (using sysenter) perf regression
  - From: vivek thakkar
- Re: x86 system call (using sysenter) perf regression
  - From: Andy Lutomirski

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