Marcelo Tosatti [off-list ref] wrote:

What you think of this, which tries to address your comments

Suggest you pass the scan_control structure down into pageout(), stick
`inflight' into struct scan_control and use some flag in scan_control to
ensure that we only throttle once per try_to_free_pages()/blaance_pgdat()
pass.

See, page reclaim is now, as much as possible, "batched".  Think of it as
operating in units of 32 pages at a time.  We should only examine the dirty
memory thresholds and throttle once per "batch", not once per page.
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