From: Andrew Morton <akpm@osdl.org>
To: Kevin Corry <kevcorry@us.ibm.com>
Cc: linux-kernel@vger.kernel.org, agk@redhat.com
Subject: Re: [PATCH] 2/5: Device-mapper: kcopyd
Date: Thu, 10 Jun 2004 11:12:23 -0700 [thread overview]
Message-ID: <20040610111223.04a0c142.akpm@osdl.org> (raw)
In-Reply-To: <200406100816.18263.kevcorry@us.ibm.com>
Kevin Corry <kevcorry@us.ibm.com> wrote:
>
> On Thursday 10 June 2004 6:18 am, Andrew Morton wrote:
> > Alasdair G Kergon <agk@redhat.com> wrote:
> > > kcopyd
> > >
> > > ...
> > > +/* FIXME: this should scale with the number of pages */
> > > +#define MIN_JOBS 512
> >
> > This pins at least 2MB of RAM up-front, even if devicemapper is not in use.
>
> Is that really the case?
No, sorry, I had CONFIG_DEBUG_PAGEALLOC turned on...
130k is still quite a lot. Bear in mind that this memory is never used
unless the page allocation attept fails. The mempool is there to prevent
OOM deadlocks and it is usually the case that a single mempool item is
sufficient for that.
next prev parent reply other threads:[~2004-06-10 18:13 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-02 15:41 [PATCH] 2/5: Device-mapper: kcopyd Alasdair G Kergon
2004-06-02 16:15 ` Andreas Dilger
2004-06-02 16:50 ` Kevin Corry
2004-07-03 5:44 ` Daniel Phillips
2004-06-02 21:15 ` Alasdair G Kergon
2004-06-03 3:41 ` Andrew Morton
2004-06-03 13:28 ` Alasdair G Kergon
2004-06-10 6:18 ` Andrew Morton
2004-06-10 8:16 ` Kevin Corry
2004-06-10 18:12 ` Andrew Morton [this message]
2004-06-10 14:55 ` Alasdair G Kergon
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