When kswapd woken up

Solution Verified - Updated -

Issue

  • Under heavy I/O load, system flushes 40-50MB even though dirty pages amount never reaches 536870912 or passed 500 centisecs.
vm.dirty_bytes = 536870912
vm.dirty_writeback_centisecs = 500
vm.dirty_expire_centisecs = 3000

Environment

  • Red Hat Enterprise Linux

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