linux-kernel - Re: [dm-devel] [PATCH] md/dm-ioctl.c: optimize memory allocation in copy

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Message-ID: <alpine.LRH.2.02.1407230816000.29551@file01.intranet.prod.int.rdu2.redhat.com>
Date:	Wed, 23 Jul 2014 08:16:58 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
cc:	"xinhui.pan" <xinhuix.pan@...el.com>, linux-kernel@...r.kernel.org,
	agk@...hat.com, snitzer@...hat.com, dm-devel@...hat.com,
	"Liu, ShuoX" <shuox.liu@...el.com>
Subject: Re: [dm-devel] [PATCH] md/dm-ioctl.c: optimize memory allocation in
 copy_params



On Wed, 23 Jul 2014, Zhang, Yanmin wrote:

> On 2014/7/22 9:23, Alasdair G Kergon wrote:
> > > > > On 2014/7/9 6:39, Mikulas Patocka wrote:
> > > > Which ioctl with more than 16kB
> > > > arguments do you use?
> > Unanswered.  Let's ask the same question in a different way:
> > 
> > Please supply the output of these three commands on the real-world system on
> > which you believe that that particular allocation is causing you a problem:
> >    dmsetup info -c
> >    dmsetup table
> >    dmsetup status
> 
> Android doesn't include the command. We compiled lvm2-2_02_107.tar.gz and copy
> dmsetup to the board. But command reports No devices.
> 
> # /data/bin/dmsetup info
> No devices found

So, it means that you do not use device mapper at all. So, why are you 
trying to change memory allocation in device mapper?

Mikulas
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