On 2015/6/5 1:09, Luck, Tony wrote: > +#ifdef CONFIG_MEMORY_MIRROR > + if (change_to_mirror(gfp_mask, ac.high_zoneidx)) > + ac.migratetype = MIGRATE_MIRROR; > +#endif > > We may have to be smarter than this here. I'd like to encourage the > enterprise Linux distributions to set CONFIG_MEMORY_MIRROR=y > But the reality is that most systems will not configure any mirrored > memory - so we don't want the common code path for memory > allocation to call functions that set the migrate type, try to allocate > and then fall back to a non-mirror when that may be a complete waste > of time. > > Maybe a global "got_mirror" that is true if we have some mirrored > memory. Then code is > > if (got_mirror && change_to_mirror(...)) > Yes, I will change next time. Thanks, > . > -- 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>