linux-kernel - Re: [PATCH 3/3] x86, extable: Handle early exceptions

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Message-ID: <CA+55aFywgsZsxRpYeY2TCHUuK6uRvp8fp8GZEVk50qNc=WS=dw@mail.gmail.com>
Date:	Thu, 19 Apr 2012 11:11:00 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Borislav Petkov <bp@...64.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 3/3] x86, extable: Handle early exceptions

On Thu, Apr 19, 2012 at 10:38 AM, Borislav Petkov <bp@...64.org> wrote:
>
> OTOH, if we can share early and normal exception handling lookup code, then a
> perfect hash would make sense as those exceptions would pile up.

Oh, any of this only makes sense if we can share it with the runtime
exception lookup.

They are *seldom* hugely performance-critical, but there are some
unusual loads where you do get a fair number of exceptions.

               Linus
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