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

[Rik van Riel]

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.
>
> 	http://lkml.org/lkml/2010/4/4/86
>
> 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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