#4490 BLOC Never A: pdflush takes 80% cpu on 622

[Zarro Boogs per Child]

#4490: pdflush takes 80% cpu on 622
----------------------------+-----------------------------------------------
 Reporter:  cscott          |       Owner:  dilinger      
     Type:  defect          |      Status:  new           
 Priority:  blocker         |   Milestone:  Never Assigned
Component:  kernel          |     Version:                
 Keywords:  jffs2, pdflush  |    Verified:  0             
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 Clean install of 622 on a C1. (not olpc-upgrade).

 Attempted to play an MP3 by clicking on a link from Browse.  Did not play,
 and system slowed down *a lot*.

 Investigation revealed jffs_gc_mtd0 taking up a large amount of CPU, and
 then pdflush began to dominate CPU.  Making eventually slowed to the point
 where even shutdown was impossible  (invoked shutdown from a root prompt,
 and it did not manage to complete, even after 10 minutes).

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Ticket URL: <https://dev.laptop.org/ticket/4490>
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