[Qemu-devel] Re: [PATCH v3] introduce on_vcpu

[Paolo Bonzini]

On 08/31/2009 01:35 PM, Glauber Costa wrote:
> On Sat, Aug 29, 2009 at 02:22:27AM +0100, Jamie Lokier wrote:
> > Anthony Liguori wrote:
> > > Glauber Costa wrote:
> > > Since we already keep the tid in the vcpu structure, it seems to make
> > > more sense to ask "am I this vcpu thread" by doing gettid() == env->tid
> > > than by maintaining a new global tls variable.
> >
> > Note that a tls variable will be much faster than gettid().  Don't
> > know if you're talking about a hot path.
> just to be sure, TLS is not supported on all our linux target hosts, right?

I think it is.

~/devel/gcc/gcc pbonzini$ grep -l SYMBOL_REF_TLS_MODEL config/*/*.c
config/alpha/alpha.c
config/arm/arm.c
config/frv/frv.c
config/i386/i386.c
config/ia64/ia64.c
config/m68k/m68k.c
config/mips/mips.c
config/pa/pa.c
config/rs6000/rs6000.c
config/s390/s390.c
config/sh/sh.c
config/sparc/sparc.c
config/xtensa/xtensa.c

Paolo