[Devel] Re: [PATCH 3/9] bio-cgroup controller

[Andrew Morton]

On Tue, 14 Apr 2009 22:21:14 +0200
Andrea Righi <righi.andrea at gmail.com> wrote:

> Subject: [PATCH 3/9] bio-cgroup controller

Sorry, but I have to register extreme distress at the name of this. 
The term "bio" is well-established in the kernel and here we have a new
definition for the same term: "block I/O".

"bio" was a fine term for you to have chosen from the user's
perspective, but from the kernel developer perspective it is quite
horrid.  The patch adds a vast number of new symbols all into the
existing "bio_" namespace, many of which aren't related to `struct bio'
at all.

At least, I think that's what's happening.  Perhaps the controller
really _is_ designed to track `struct bio'?  If so, that's an odd thing
to tell userspace about.


> The controller bio-cgroup is used by io-throttle to track writeback IO
> and for properly apply throttling.

Presumably it tracks all forms of block-based I/O and not just delayed
writeback.


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