Messages in this thread | | | Date | Tue, 5 Jun 2007 16:55:38 -0700 | From | Paul Jackson <> | Subject | Re: [patch] cpusets: do not allow TIF_MEMDIE tasks to allocate globally |
| |
> If that fails, we can't allocate elsewhere because then we have taken > exclusive memory from other applications and is contrary to the definition > of mem_exclusive.
Well, I can't speak to the 'real' meaning of TIF_MEMDIE with authority, but I can speak to the meaning of cpuset flags.
The mem_exclusive flag doesn't mean this.
It means that you cannot overlap the memory of a sibling cpuset.
You will, necessarily, still overlap the memory of your ancestor cpusets.
Whether or not you make any use of the mem_exclusive flag, you still get the same (limited) guarantees of memory usage -- namely that your memory won't be used by tasks in non-overlapping cpusets, with some exceptions, such as: 1) memory handed out to interrupt code, 2) memory handed out for GFP_ATOMIC requests, and 3) tasks marked PF_EXITING -- will soon free up memory
Tasks in cpusets ancestor to your tasks cpuset can always, easily, use memory on the same nodes your task is on.
-- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson <pj@sgi.com> 1.925.600.0401 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |