Re: [PATCH 12/29] x86, tsx: Add a per thread transaction disablecount

From: Borislav Petkov
Date: Sat Mar 23 2013 - 13:32:53 EST

On Sat, Mar 23, 2013 at 10:16:28AM -0700, Linus Torvalds wrote:
> On Sat, Mar 23, 2013 at 8:52 AM, Borislav Petkov <bp@xxxxxxxxx> 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.

Right, but does nesting even apply here? I mean, AFAICR the commit
message, we're talking about per-thread transaction disabling. IOW, this
is an on/off button used in a boolean context.

Or is this going to be used as a mechanism to tisable TSX when max
nesting level has been reached?


Btw, the disable/reenable_txn() aren't used anywhere in the patchset and
I'd actually like to get an idea where/how those are used.



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