linux-kernel - Re: bcache: order 7 allocation

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Message-ID: <20130624200518.GA2509@google.com>
Date:	Mon, 24 Jun 2013 13:05:18 -0700
From:	Kent Overstreet <koverstreet@...gle.com>
To:	Pavel Machek <pavel@....cz>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	linux-bcache@...r.kernel.org
Subject: Re: bcache: order 7 allocation

On Sat, Jun 22, 2013 at 01:47:46PM +0200, Pavel Machek wrote:
> Hi!
> 
> I'm trying to play with bcache, but first surprise was oom in syslog:
> 
> Order 7 alocation is pretty big, no?

That's a btree node - and after it allocates the reserve at startup,
allocation failures don't matter.

I would just flip on CONFIG_COMPACTION - CONFIG_BCACHE used to select
that but someone complained (probably I just shouldn't have listened).
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