On Fri, Oct 24, 2014 at 09:41:49AM -0500, Christoph Lameter wrote: > > I found that you said retrieving tid first is sufficient to do > > things right in old discussion. :) > > Right but the tid can be obtained from a different processor. > > > One other aspect of this patchset is that it reduces the cache footprint > of the alloc and free functions. This typically results in a performance > increase for the allocator. If we can avoid the page_address() and > virt_to_head_page() stuff that is required because we drop the ->page > field in a sufficient number of places then this may be a benefit that > goes beyond the RT and CONFIG_PREEMPT case. Yeah... if we can avoid those function calls, it would be good. But, current struct kmem_cache_cpu occupies just 32 bytes on 64 bits machine, and, that means just 1 cacheline. Reducing size of struct may have no remarkable performance benefit in this case. 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>