Re: [PATCH 1/7] vmscan: raise the bar to PAGEOUT_IO_SYNC stalls

From: Rik van Riel
Date: Thu Aug 05 2010 - 11:20:29 EST

On 08/05/2010 02:12 AM, KOSAKI Motohiro wrote:
From: Wu Fengguang<fengguang.wu@xxxxxxxxx>

Fix "system goes unresponsive under memory pressure and lots of
dirty/writeback pages" bug.

In the above thread, Andreas Mohr described that

Invoking any command locked up for minutes (note that I'm
talking about attempted additional I/O to the _other_,
_unaffected_ main system HDD - such as loading some shell
binaries -, NOT the external SSD18M!!).

This happens when the two conditions are both meet:
- under memory pressure
- writing heavily to a slow device

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

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