KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> writes: > On Fri, 29 Oct 2010 00:09:14 -0700 > Greg Thelen <gthelen@xxxxxxxxxx> wrote: > >> If the current process is in a non-root memcg, then >> balance_dirty_pages() will consider the memcg dirty limits >> as well as the system-wide limits. This allows different >> cgroups to have distinct dirty limits which trigger direct >> and background writeback at different levels. >> >> Signed-off-by: Andrea Righi <arighi@xxxxxxxxxxx> >> Signed-off-by: Greg Thelen <gthelen@xxxxxxxxxx> > > Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> > > Ideally, I think some comments in the code for "why we need double-check system's > dirty limit and memcg's dirty limit" will be appreciated. I will add to the balance_dirty_pages() comment. It will read: /* * balance_dirty_pages() must be called by processes which are generating dirty * data. It looks at the number of dirty pages in the machine and will force * the caller to perform writeback if the system is over `vm_dirty_ratio'. * If we're over `background_thresh' then the writeback threads are woken to * perform some writeout. The current task may have per-memcg dirty * limits, which are also checked. */ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>