linux-ext4 - how to scale root-reserved space going forward...

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Message-ID: <49AB0ABE.1030009@redhat.com>
Date:	Sun, 01 Mar 2009 16:22:54 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: how to scale root-reserved space going forward...

5% of a 16T filesystem is getting a little crazy from the point of view
of "root-reserved" - 800G!

But I think the original reason for this reserved space was actually as
an allocator cushion; letting root gain access to it was just a
safety-valve for that.

Now that we have a completely different allocator in ext4, and
potentially much larger filesystems, I think we need to revisit how much
is held back, and for what reason.

Any thoughts on a reasonable way to scale this reservation (or, just for
discussion - if it's even needed at all today for ext4?)

-Eric
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