linux-kernel - Re: [PATCH v3 2.6.39-rc1-tip 6/26] 6: Uprobes: register/unregister probes.

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Date:	Mon, 18 Apr 2011 14:20:36 +0200
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>,
	Jonathan Corbet <corbet@....net>,
	Christoph Hellwig <hch@...radead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	SystemTap <systemtap@...rces.redhat.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2.6.39-rc1-tip 6/26]  6: Uprobes:
 register/unregister probes.

On Fri, 2011-04-01 at 20:03 +0530, Srikar Dronamraju wrote:
> +static int remove_uprobe(struct mm_struct *mm, struct uprobe *uprobe)
> +{
> +       int ret = 0;
> +
> +       /*TODO: remove breakpoint */
> +       if (!ret)
> +               atomic_dec(&mm->uprobes_count);
> +
> +       return ret;
> +}

> +static void delete_uprobe(struct mm_struct *mm, struct uprobe *uprobe)
> +{
> +       down_read(&mm->mmap_sem);
> +       remove_uprobe(mm, uprobe);
> +       list_del(&mm->uprobes_list);
> +       up_read(&mm->mmap_sem);
> +       mmput(mm);
> +}

> +static void erase_uprobe(struct uprobe *uprobe)
> +{
> +       unsigned long flags;
> +
> +       synchronize_sched();
> +       spin_lock_irqsave(&treelock, flags);
> +       rb_erase(&uprobe->rb_node, &uprobes_tree);
> +       spin_unlock_irqrestore(&treelock, flags);
> +       iput(uprobe->inode);
> +} 

remove,delete,erase.. head spins.. ;-)


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