From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kent Overstreet <koverstreet@google.com>
Subject: Re: bcache: order 7 allocation
Date: Mon, 24 Jun 2013 13:05:18 -0700
Message-ID: <20130624200518.GA2509@google.com>
References: <20130622114745.GB8075@amd.pavel.ucw.cz>
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To: Pavel Machek <pavel@ucw.cz>
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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).