hi Michal: >> Normal free:56088kB min:2000kB low:2500kB high:3000kB >> active_anon:148332kB inactive_anon:6040kB active_file:1356kB >> inactive_file:5240kB unevictable:0kB isolated(anon):0kB >> isolated(file):0kB present:329728kB managed:250408kB mlocked:0kB >> dirty:120kB writeback:0kB mapped:8108kB shmem:6136kB >> slab_reclaimable:5520kB slab_unreclaimable:26128kB kernel_stack:2720kB >> pagetables:4424kB unstable:0kB bounce:0kB free_cma:55452kB > > free-free_cma = 636kB so you are way below the watermark and that is After tracing the __alloc_pages_slowpath, in the 2nd time we call get_page_from_freelist, we will purposely put alloc_flags & ~ALLOC_NO_WATERMARKS. Doesn't that mean kernel will bypass __zone_watermark_ok? Sincerely appreciate your kind help ^^ -- 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>