Messages in this thread | | | Date | Mon, 6 Feb 2006 12:59:03 -0800 (PST) | From | Christoph Lameter <> | Subject | OOM behavior in constrained memory situations |
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There are situations in which memory allocations are restricted by policy, by a cpuset or by type of allocation.
I propose that we need different OOM behavior for the cases in which the user has imposed a limit on what type of memory to be allocated. In that case the application should be terminate with OOM. The OOM killer should not run.
The huge page allocator has already been modified to return a Bus Error because it would otherwise trigger the OOM killer. Its a bit strange if an app returns a Bus Error because it its out of memory.
Could we modify the system so that the application requesting memory is terminated with an out of memory condition if
1. No huge pages are available anymore.
2. The application has set a policy that restricts allocation to certain nodes.
3. An application is restricted by a cpuset to certain nodes.
4. An application has requested large amounts of memory and the allocation fails.
That should avoid the OOM killer in most situations.
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