From: Linus Torvalds <torvalds@linux-foundation.org>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Andrew Morton <akpm@linux-foundation.org>,
Andrew Lutomirski <luto@kernel.org>,
Borislav Petkov <bp@alien8.de>,
Josh Poimboeuf <jpoimboe@redhat.com>, Peter Anvin <hpa@zytor.com>,
Denys Vlasenko <dvlasenk@redhat.com>
Subject: Re: x86/asm: __clear_user() micro-optimization (was: "Re: [GIT PULL] x86/asm changes for v4.18")
Date: Tue, 5 Jun 2018 10:32:55 -0700 [thread overview]
Message-ID: <CA+55aFxTve6FxLuvWyyD88ACOg+3eHKbpWUeuvNZMSB=AFfuqg@mail.gmail.com> (raw)
In-Reply-To: <20180605172243.GA2059@avx2>
On Tue, Jun 5, 2018 at 10:22 AM Alexey Dobriyan <adobriyan@gmail.com> wrote:
>
> Tested? :^) I had P4 maybe ~15(?) years ago.
Did you EVEN test it on what you have today?
Do you have any numbers at all, in other words?
Micro-optimizations need numbers. Otherwise they aren't
micro-optimizations, they are just "change code randomly".
Linus
next prev parent reply other threads:[~2018-06-05 17:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-04 12:21 [GIT PULL] x86/asm changes for v4.18 Ingo Molnar
2018-06-05 1:58 ` Linus Torvalds
2018-06-05 15:05 ` x86/asm: __clear_user() micro-optimization (was: "Re: [GIT PULL] x86/asm changes for v4.18") Ingo Molnar
2018-06-05 15:47 ` Linus Torvalds
2018-06-05 17:22 ` Alexey Dobriyan
2018-06-05 17:32 ` Linus Torvalds [this message]
2018-06-05 22:41 ` Alexey Dobriyan
2018-06-05 23:01 ` Linus Torvalds
2018-06-05 23:04 ` Linus Torvalds
2018-06-05 23:20 ` Alexey Dobriyan
2018-06-05 23:27 ` Linus Torvalds
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