What does this parameter mean?
# cat /proc/vmstat | grep low kswapd_low_wmark_hit_quickly 2
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After kswapd has reclaimed enough pages for free pages to be above the high watermark, it attempts to sleep for 100ms. One of three things happens next:
It's a little more complicated than that since there are other conditions besides watermarks that may cause kswapd to wake up or continue running, but that is the basic idea.