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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
