linux-kernel - Re: [PATCH] KVM:make cpuid_entry2

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Message-ID: <YvIS0nvStyUYR7ep@zn.tnic>
Date:   Tue, 9 Aug 2022 09:54:58 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Liam Ni <zhiguangni01@...il.com>
Cc:     seanjc@...gle.com, pbonzini@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, dave.hansen@...ux.intel.com, hpa@...or.com,
        x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM:make cpuid_entry2_find more efficient

On Tue, Aug 09, 2022 at 01:51:38PM +0800, Liam Ni wrote:
> Compared with the way of obtaining the pointer by
> fetching the value of the array and then fetching the pointer,
> the way of obtaining the pointer by the pointer offset is more efficient.

How did you determine that?

Hint: look at the generated assembler before and after your change and
see if there are any differences.

:-)

-- 
Regards/Gruss,
    Boris.

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