linux-kernel - Re: [2.6.23 PATCH 14/18] dm: netlink add to core

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Message-ID: <20070712234159.GC4768@us.ibm.com>
Date:	Thu, 12 Jul 2007 16:41:59 -0700
From:	Mike Anderson <andmike@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Alasdair G Kergon <agk@...hat.com>, dm-devel@...hat.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [2.6.23 PATCH 14/18] dm: netlink add to core

Eric W. Biederman <ebiederm@...ssion.com> wrote:
> As for worry about kmallocs do these events happen often?  
The worst case would most likely be in a dm multipath configuration where
you could get a burst of N number events (N being equal to the number of
luns times the number of paths that are having an issue).

> I would
> not expect any of them in the normal course of operation for a system.

Yes, the ones that are part of this patch are unexpected events or
recovery of the unexpected event. 

> Worst case you handle extra kmallocs with a library function.
> It's not like you are using GFP_ATOMIC.

I was using GFP_ATOMIC as I did not want __GFP_IO as in some testing there
was a case where heavy file system IO was going on and an injected error
event caused the swap device into a temporary queued condition while an
event was trying to be sent. I may need to go back and investigate this
case on recent kernels as it has been a while since I did the test case.

-andmike
--
Michael Anderson
andmike@...ibm.com
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