On Thu, Dec 25, 2014 at 05:43:26PM +0800, Hui Zhu wrote: > In Joonsoo's CMA patch "CMA: always treat free cma pages as non-free on > watermark checking" [1], it changes __zone_watermark_ok to substruct CMA > pages number from free_pages if system use CMA: > if (IS_ENABLED(CONFIG_CMA) && z->managed_cma_pages) > free_pages -= zone_page_state(z, NR_FREE_CMA_PAGES); Hello, In fact, without that patch, watermark checking has a problem in current kernel. If there is reserved CMA region, watermark check for high order allocation is done loosly. See following thread. https://lkml.org/lkml/2014/5/30/320 Your patch can fix this situation, so, how about submitting this patch separately? 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>