hi Michal:

quoted

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 ^^

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