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Re: task blocked for more than 120 seconds

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: task blocked for more than 120 seconds
From: "Josef 'Jeff' Sipek" <jeffpc@xxxxxxxxxxxxxx>
Date: Thu, 27 Sep 2012 08:49:15 -0400
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20120423232759.GO9541@dastard>
References: <20120418151139.GC4652@xxxxxxxxxxxxxxxxxxxxxx> <20120418234821.GR6734@dastard> <20120419154601.GB8230@xxxxxxxxxxxxxxxxxxxxxx> <20120419225603.GA9541@dastard> <20120420135820.GB9189@xxxxxxxxxxxxxxxxxxxxxx> <20120421002932.GG9541@dastard> <20120423202441.GD21260@xxxxxxxxxxxxxxxxxxxxxx> <20120423232759.GO9541@dastard>
User-agent: Mutt/1.5.21 (2010-09-15)
On Tue, Apr 24, 2012 at 09:27:59AM +1000, Dave Chinner wrote:
...
> So, yes, your hangs are definitely due to inode buffer RMW cycles
> when trying to flush dirty inodes from the cache. I have a few
> ideas on how to fix this - but I'm not sure whether a current TOT
> solution will be easily back-portable. The simplest solution is a
> readahead based solution - AIL pushing is async, and will cycle back
> to inodes that it failed to flush the first time past, so triggering
> readahead on the first pass might work just fine.

Have you had time to look at this?  (We got bitten by this again and I
really don't want to go back to ext4.)  Is there anything I can help with?

Jeff.

-- 
Evolution, n.:
  A hypothetical process whereby infinitely improbable events occur with
  alarming frequency, order arises from chaos, and no one is given credit.

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