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Re: XFS metadata flushing design - current and future

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: XFS metadata flushing design - current and future
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 30 Aug 2011 03:10:27 -0400
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <20110830070641.GR3162@dastard>
References: <20110827080321.GA16661@xxxxxxxxxxxxx> <20110829010149.GE3162@dastard> <20110829123318.GA12928@xxxxxxxxxxxxx> <20110830012820.GI3162@dastard> <20110830050959.GA8667@xxxxxxxxxxxxx> <20110830070641.GR3162@dastard>
User-agent: Mutt/1.5.21 (2010-09-15)
On Tue, Aug 30, 2011 at 05:06:42PM +1000, Dave Chinner wrote:
> 
> The advantage of using our own list is that we can still then sort
> them (might be thousands of buffers we queue in a single pass)
> before submitting them for IO.  The on-stack plugging doesn't allow
> this at all, IIUC, as itis really just a FIFO list above the IO
> scheduler queues....

The on-stack plugging already sorts - manually in that code for the
request queues (not interesting for us), and currently by block number
as well using the elevator.  But the current code is more of a
guideline, I have some fairly big changes for the that area of block
layer in the pipeline.

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