On Tue, Jan 14, 2014 at 04:35:33PM -0800, Andrew Morton wrote: > > Would it be overkill to save the kernel default both with and without thp > > and then doing a WARN_ON_ONCE() if a user-written value is ever less? > > Well, min_free_kbytes is a userspace thing, not a kernel thing - maybe > THP shouldn't be dinking with it. What effect is THP trying to achieve > and can we achieve it by other/better means?
It moved logic from hugeadm where few people knew about it to the kernel. The value is related to anti-fragmentation. With the recommended setting the probability of mixing pages of different mobility within a single pageblock is reduced. Very very superficially, it reduces the number of instances the mm_page_alloc_extfrag tracepoint is triggered with parameters that are considered to be severely fragmenting. -- Mel Gorman SUSE Labs -- 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/