On Thu, 9 May 2013 16:21:28 +0900 Minchan Kim <minc...@kernel.org> wrote:
> This patch adds address range reclaim of a process. > The requirement is following as, > > Like webkit1, it uses a address space for handling multi tabs. > IOW, it uses *one* process model so all tabs shares address space > of the process. In such scenario, per-process reclaim is rather > coarse-grained so this patch supports more fine-grained reclaim > for being able to reclaim target address range of the process. > For reclaim target range, you should use following format. > > echo [addr] [size-byte] > /proc/pid/reclaim > > The addr should be page-aligned. > > So now reclaim konb's interface is following as. > > echo file > /proc/pid/reclaim > reclaim file-backed pages only > > echo anon > /proc/pid/reclaim > reclaim anonymous pages only > > echo all > /proc/pid/reclaim > reclaim all pages > > echo 0x100000 8K > /proc/pid/reclaim > reclaim pages in (0x100000 - 0x102000) This might be going a bit far. The application itself can be modified to use fadvise/madvise/whatever to release unused pages and that's a better interface. Athough it's a bit of a pipe-dream, I do think we should encourage userspace to go this path, rather than providing ways for hacky admin tools to go poking around in /proc/pid/maps and whacking apps externally. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
