Messages in this thread | | | Date | Tue, 23 Aug 2005 01:46:26 +0530 | From | Dinakar Guniguntala <> | Subject | Re: [PATCH] ia64 cpuset + build_sched_domains() mangles structures |
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On Mon, Aug 22, 2005 at 06:07:19PM +0200, Ingo Molnar wrote: > great! Andrew, i'd suggest we try the merged patch attached below in > -mm. >
Ingo, unfortunately I am hitting panic's on stress testing. The panic screen is attached in the .png below.
On debugging I found that the panic happens consistently in this line of code in function find_busiest_group
*imbalance = min((max_load - avg_load) * busiest->cpu_power, (avg_load - this_load) * this->cpu_power) / SCHED_LOAD_SCALE;
Here I find that the "this" pointer is still NULL. I verified this by a quick hack as below in the same function and with this hack it seems to run for hours
- if (!busiest || this_load >= max_load) + if (!this || !busiest || this_load >= max_load)
This can only happen if the none of the sched groups pointed to by the 'sd' of the current cpu contain the current cpu. I was wondering if this had anything to do with the way that we are using RCU to assign/ read the 'sd' pointer.
Any thoughts ??
-Dinakar
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