linux-kernel - Re: [PATCH 03/10] idr: Rewrite ida

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Message-ID: <20130621163330.GA6503@redhat.com>
Date:	Fri, 21 Jun 2013 12:33:30 -0400
From:	David Teigland <teigland@...hat.com>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	Steven Whitehouse <swhiteho@...hat.com>, akpm@...ux-foundation.org,
	tj@...nel.org, axboe@...nel.dk, nab@...ux-iscsi.org,
	bcrl@...ck.org, linux-kernel@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: [PATCH 03/10] idr: Rewrite ida

On Wed, Jun 19, 2013 at 04:38:36PM -0700, Kent Overstreet wrote:
> On Wed, Jun 19, 2013 at 10:40:22AM +0100, Steven Whitehouse wrote:
> > Millions of IDs is something that is fairly normal for DLM, since there
> > will be two DLM locks per cached inode with GFS2 and people tend to use
> > it on pretty large servers with lots of memory,
> 
> Thanks, I wasn't aware of that. Is the 31 bits for the id limitation an
> issue for you? While I'm at changing ids to longs should be fairly
> trivial.

There is a dlm_lkb struct in memory for each id, so 31 bits will not
be a problem.
Dave

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