linux-kernel - Re: [PATCH 12/29] x86, tsx: Add a per thread transaction disable count

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Message-ID: <CA+55aFwim=_UjV+n6MGRCgoa3B-9RuhVF2h=munaRpZhT3Ntfg@mail.gmail.com>
Date:	Sat, 23 Mar 2013 10:16:28 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Borislav Petkov <bp@...en8.de>, Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 12/29] x86, tsx: Add a per thread transaction disable count

On Sat, Mar 23, 2013 at 8:52 AM, Borislav Petkov <bp@...en8.de> wrote:
>
> Really? Let's see:

Your test seems to assume that a single bit is sufficient, which
sounds unlikely. If you have any kind of nesting going on, you need
more than one bit. Then add/sub isn't a single "xor" of a bit any
more.

That said, making it just a byte sounds more than enough. How deep
would anybody want to nest it? Do we care?

                   Linus
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