Re: OpenSSI preview on Debian Lenny (on x86_64)

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On Sat, Apr 24, 2010 at 10:49 AM, John Hughes <[email protected]> wrote:

> On 20/04/10 11:04, John Hughes wrote:
>
>> Quickly hacking in some stuff copied from the i386 version gets me to the
>> point where my test program is segfaulting on the destination node.
>>
>>  I cannot understand why migrate(2) works but /proc/xxx/goto doesn't.
>
> The process is clearly being migrated to the destination node, but it
> segfaults (almost?) immediately on arrival.
>
>
x86_64 entry.S does FIXUP_TOP_OF_STACK before calling sys_migrate but not in
the signal path.  This macro mangles rsp to point to the user segments.
Maybe this explains why /proc/xxx/goto doesn't work properly.

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<div class=3D"gmail_quote">On Sat, Apr 24, 2010 at 10:49 AM, John Hughes <s=
pan dir=3D"ltr">&lt;<a href=3D"mailto:[email protected]">[email protected]</a>&gt=
;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"border-left: =
1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;=
">
<div class=3D"im">On 20/04/10 11:04, John Hughes wrote:<br>
</div><div class=3D"im"><blockquote class=3D"gmail_quote" style=3D"border-l=
eft: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left:=
 1ex;">
Quickly hacking in some stuff copied from the i386 version gets me to the p=
oint where my test program is segfaulting on the destination node.<br>
<br>
</blockquote></div>
I cannot understand why migrate(2) works but /proc/xxx/goto doesn&#39;t.<br=
>
<br>
The process is clearly being migrated to the destination node, but it segfa=
ults (almost?) immediately on arrival.<br>
<br>
</blockquote></div><br>x86_64 entry.S does FIXUP_TOP_OF_STACK before callin=
g sys_migrate but not in the signal path.=A0 This macro mangles rsp to poin=
t to the user segments.=A0 Maybe this explains why /proc/xxx/goto doesn&#39=
;t work properly.<br>

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