[$] Expedited memory reclaim from killed processes

Running out of memory puts a Linux system into a difficult situation; inthe worst cases, there is often no way out other than killing one or moreprocesses to reclaim their memory. This killing may be done by the kernelitself or, on systems like Android, by a user-space out-of-memory (OOM)killer process. Killing a process is almost certain to make somebody unhappy;the kernel should at least try to use that process's memory expeditiouslyso that, with luck, no other processes must die. That does not alwayshappen, though, in current kernels. Thispatch set from Suren Baghdasaryan aims to improve the situation, butthe solution that results in the end may take a different form.