quoted

I've already submitted a pair of patches for option 1. I don't think
option 2 gains us anything. I think it's more likely we should worry
about all_unreclaimable being set when shrink_slab is returning 0 and we
are encountering so many dirty pages that pages_scanned is high enough.

Okay.

Colin reported he had no problem with patch 1 in this series and
mine(ie, just cond_resched right after balance_pgdat call without no
patch of shrink_slab).

If Colin's test is successful, I don't insist on mine.
(I don't want to drag on for days :( )
If KOSAKI agree, let's ask the test to Colin and confirm our last test.

KOSAKI. Could you post a your opinion?

Yeah.
I also don't have any motivation to ignore Colin's test result.

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