[PATCH 0/2] Enable MSR_TM lazily

[Nicholas Piggin]

On Wed, 14 Sep 2016 11:10:22 -0300
Carlos Eduardo Seo <cseo at linux.vnet.ibm.com> wrote:

> On 9/14/16 8:28 AM, Nicholas Piggin wrote:
> >
> > How common it is for glibc to be built with elision?
> >  
> 
> Not that common. We have it built with TLE support in Ubuntu (starting 
> in 15.04), SLES 12 (since SP2) and AT 9.0-0.
> 
> However, it is only enabled by default in Ubuntu. For SLES and AT 9.0, 
> the user has to set an env var to enable it (it's a hack).
> 
> There is some work upstream to add a tunables framework to glibc. That 
> will allow us to properly provide a way to users enable/disable TLE as 
> they wish. That patch is almost in, and as soon as it's committed, we'll 
> start working on the tunable for TLE.

Okay, but for TLE-enabled case, we still want to skip the tabort
before syscall on recent kernels, so we could add that now with a 
relatively small patch couldn't we?

Thanks,
Nick