f2fs causes system stall

[Marc Dietrich]

Hi,

it took me a while to bisect a problem which causes my ARM (tegra2) netbook to 
frequently stall for 5-10 seconds when I enable EXA acceleration (opentegra 
experimental ddx). I can only guess that the offending commit 8618b88 "f2fs: 
fix not to write data pages on the page reclaiming path" somehow causes high 
kernel latencies which may interrupt/disturb the command stream to the gpu in 
this particular case. Reverting this commit fixes the problem. Any hints?

Regards,

Marc

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