linux-kernel - Re: [PATCH 0/13] maps: pagemap, kpagemap, and related cleanups

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Message-ID: <461F7B9A.80406@yahoo.com.au>
Date:	Fri, 13 Apr 2007 22:46:18 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	ananth@...ibm.com
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	William Lee Irwin III <wli@...omorphy.com>,
	Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/13] maps: pagemap, kpagemap, and related cleanups

Ananth N Mavinakayanahalli wrote:
> On Fri, Apr 13, 2007 at 12:50:20PM +1000, Nick Piggin wrote:

>>It definitely seems like you can use some kernel functions, but the
>>ones I saw may just be systemtap facilities. But what is so surprising
>>about being able to call a kernel function when running in kernel
>>context? Perhaps there is some fundamental limitation of kprobes that
>>I don't understand.
> 
> 
> The main requirement for kprobes handlers is that they can't sleep. You
> could definitely call a kernel function from kprobe handlers as long as
> the function doesn't sleep.

That would be enough to access basically all the VM data structures.

-- 
SUSE Labs, Novell Inc.
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