linux-kernel - Re: [RFC] [PATCH 2.6.37-rc5-tip 14/20] 14: uprobes: Handing int3 and singlestep exception.

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Message-ID: <1296055788.28776.1222.camel@laptop>
Date:	Wed, 26 Jan 2011 16:29:48 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	SystemTap <systemtap@...rces.redhat.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC] [PATCH 2.6.37-rc5-tip 14/20] 14: uprobes: Handing int3
 and singlestep exception.

On Wed, 2011-01-26 at 20:44 +0530, Srikar Dronamraju wrote:
> So it simplifies to 
> 
>         down_read(&mm->mmap_sem);
>         vma = find_vma(mm, probept);
>         if (valid_vma(vma)) {
>                u = find_uprobe(vma->vm_file->f_mapping->host,
>                                probept - vma->vm_start);
>         }
>         up_read(&mm->mmap_sem); 

Almost, the offset within a file is something like:

  (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT)


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