Re: [PATCH] multithreaded coredumps for elf exeecutables

[Daniel Jacobowitz]

On Thu, Mar 21, 2002 at 03:46:50PM +0530, Vamsi Krishna S . wrote:
> Dan,
> 
> Thanks for pointing this out. I see that this change has now gone into
> 2.4.18 as well as 2.5.4. We would ensure that the down_write happens
> only after the registers of all threads are collected.

Yes, your other patch for this looks OK.

> Coming back to the original point raised by Pavel, indeed there is 
> nothing preventing external code (any other kernel modules) modifying
> the cpus_allowed field from under us. This could get worse in 2.5.x
> where a user could change cpu affinity (through proc or a syscall, 
> though I don't think the patches providing this are accepted as yet).

We really need a non-signal-based way to tell the scheduler that a task
can not be scheduled.  A lot of the machinery is all there, but private to
sched.c; the rest is pretty straightforward.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer