>> 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? I apologize for my misunderstanding. (alloc_flags & ~ALLOC_NO_WATERMARKS) will NOT bypass __zone_watermark_ok. on the contrary, it will filter out watermarks checking. there is one thing makes me curious, why we put alloc_flags = gfp_to_alloc_flags(gfp_mask) in __alloc_pages_slowpath instead of __alloc_pages_nodemask? 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>