linux-kernel - Re: [PATCH v2 2.6.38-rc8-tip 5/20] 5: Uprobes: register/unregister probes.

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Date:	Tue, 15 Mar 2011 13:47:42 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	SystemTap <systemtap@...rces.redhat.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 2.6.38-rc8-tip 5/20] 5: Uprobes: register/unregister
 probes.

On Tue, 2011-03-15 at 22:45 +0530, Srikar Dronamraju wrote:
> > > +   }
> > > +   list_for_each_entry_safe(mm, tmpmm, &tmp_list, uprobes_list) {
> > > +           down_read(&mm->mmap_sem);
> > > +           if (!install_uprobe(mm, uprobe))
> > > +                   ret = 0;
> > 
> > Installing it once is success ?
> 
> This is a little tricky. My intention was to return success even if one
> install is successful. If we return error, then the caller can go
> ahead and free the consumer. Since we return success if there are
> currently no processes that have mapped this inode, I was tempted to
> return success on atleast one successful install.

What about an all or nothing approach. If one fails, remove all that
were installed, and give up.

-- Steve


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