[uml-devel] Needed arch_copy_tls? Not done by dup_task_struct?

[uml-devel] Needed arch_copy_tls? Not done by dup_task_struct?

[Blaisorblade]

I looked at my patch's comment and noticed that arch_copy_tls, your 
introduction, shouldn't indeed be needed, because dup_task_struct should do 
that (it copies the whole task_struct, and it seems that arch_thread is 
included in that blob rather than pointed too).

I'm fairly puzzled at that. Have you any idea on this?

Also, since you have a good test FS (Fedora), can I send you the updated 
versions I put out / can you test them? My Sarge isn't good any more, likely 
because glibc was updated by apt-get, and it works well with the LDT 
fallback.

I've just uploaded 2.6.15-bs1-tls for people to test.
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade

	

	
		
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[uml-devel] Re: Needed arch_copy_tls? Not done by dup_task_struct?

[Jeff Dike]

On Wed, Jan 18, 2006 at 08:53:29PM +0100, Blaisorblade wrote:
> I looked at my patch's comment and noticed that arch_copy_tls, your 
> introduction, shouldn't indeed be needed, because dup_task_struct should do 
> that (it copies the whole task_struct, and it seems that arch_thread is 
> included in that blob rather than pointed too).
> 
> I'm fairly puzzled at that. Have you any idea on this?

I wondered about that, too, but hadn't bothered looking into it yet.  I'm
suspicious that we initialize p.thread with INIT_THREAD, which would
obviously wipe it out.

> Also, since you have a good test FS (Fedora), can I send you the updated 
> versions I put out / can you test them? My Sarge isn't good any more, likely 
> because glibc was updated by apt-get, and it works well with the LDT 
> fallback.

I have - they are on my patches page.  I added back the 
user_desc -> modify_ldt_t thing because I don't have a user_desc here.

Other than that (and the O_FORCE succeeded message), it seems to be working
fine.

> I've just uploaded 2.6.15-bs1-tls for people to test.

What I grabbed is what was there this morning.  If you changed anything
significant, let me know, and I'll pull again.

				Jeff


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Re: [uml-devel] Re: Needed arch_copy_tls? Not done by dup_task_struct?

[Blaisorblade]

On Thursday 19 January 2006 00:38, Jeff Dike wrote:
> On Wed, Jan 18, 2006 at 08:53:29PM +0100, Blaisorblade wrote:
> > I looked at my patch's comment and noticed that arch_copy_tls, your
> > introduction, shouldn't indeed be needed, because dup_task_struct should
> > do that (it copies the whole task_struct, and it seems that arch_thread
> > is included in that blob rather than pointed too).
> >
> > I'm fairly puzzled at that. Have you any idea on this?

> I wondered about that, too, but hadn't bothered looking into it yet.  I'm
> suspicious that we initialize p.thread with INIT_THREAD, which would
> obviously wipe it out.

> > Also, since you have a good test FS (Fedora), can I send you the updated
> > versions I put out / can you test them? My Sarge isn't good any more,
> > likely because glibc was updated by apt-get, and it works well with the
> > LDT fallback.

> I have - they are on my patches page.  I added back the
> user_desc -> modify_ldt_t thing because I don't have a user_desc here.

> Other than that

> (and the O_FORCE succeeded message),

Uff, I want to remove load_TLS(O_FORCE) from there altogether.

Could you unapply 

patches/tls/uml-add-tls-support-debug-check-never-works

and verify it works correctly however? I want that to work :-) !

> it seems to be working  
> fine.

> > I've just uploaded 2.6.15-bs1-tls for people to test.

> What I grabbed is what was there this morning.  If you changed anything
> significant, let me know, and I'll pull again.
Ok, don't think anything changed for now. I'm changing things however, so 
please stick modification in different patches so we merge easily.
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade

	

	
		
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Re: [uml-devel] Re: Needed arch_copy_tls? Not done by dup_task_struct?

[Blaisorblade]

On Thursday 19 January 2006 00:38, Jeff Dike wrote:
> On Wed, Jan 18, 2006 at 08:53:29PM +0100, Blaisorblade wrote:
> > I looked at my patch's comment and noticed that arch_copy_tls, your
> > introduction, shouldn't indeed be needed, because dup_task_struct should
> > do that (it copies the whole task_struct, and it seems that arch_thread
> > is included in that blob rather than pointed too).
> >
> > I'm fairly puzzled at that. Have you any idea on this?
>
> I wondered about that, too, but hadn't bothered looking into it yet.  I'm
> suspicious that we initialize p.thread with INIT_THREAD, which would
> obviously wipe it out.

> > Also, since you have a good test FS (Fedora), can I send you the updated
> > versions I put out / can you test them? My Sarge isn't good any more,
> > likely because glibc was updated by apt-get, and it works well with the
> > LDT fallback.

> I have - they are on my patches page.  I added back the
> user_desc -> modify_ldt_t thing because I don't have a user_desc here.

I'm fixing this by copying the structure definition into sysdep/tls.h header 
files with a different name and using that one in os-Linux/tls.c.

> Other than that (and the O_FORCE succeeded message), it seems to be working
> fine.

> > I've just uploaded 2.6.15-bs1-tls for people to test.

> What I grabbed is what was there this morning.  If you changed anything
> significant, let me know, and I'll pull again.
I'll notify you when needed.
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade

		
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Re: [uml-devel] Re: Needed arch_copy_tls? Not done by dup_task_struct?

[Jeff Dike]

On Thu, Jan 19, 2006 at 12:39:29AM +0100, Blaisorblade wrote:
> Could you unapply 
> 
> patches/tls/uml-add-tls-support-debug-check-never-works
> 
> and verify it works correctly however? I want that to work :-) !

Sill seems OK.

> Ok, don't think anything changed for now. I'm changing things however, so 
> please stick modification in different patches so we merge easily.

Yeah, I'm leaving yours alone and keeping my changes in their own patches.

				Jeff


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