On 08/20/2012 05:39 AM, Michel Lespinasse wrote:
I would still prefer if we could just remove the anon_vma_chain stuff, though.
If only we could. That simply replaces a medium issue at fork time, with the potential for a catastrophic issue at page reclaim time, in any workload with heavily forking server software. Without the anon_vma_chains, we end up scanning every single one of the child processes (and the parent) for every COWed page, which can be a real issue when the VM runs into 1000 such pages, for 1000 child processes. Unfortunately, we have seen this happen... -- All rights reversed -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>