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Subject: Re: [PATCH v4 3.0-rc2-tip 7/22]  7: uprobes: mmap and fork hooks.
From: Peter Zijlstra <peterz@infradead.org>
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Date: Mon, 18 Jul 2011 16:31:16 +0200
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To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>, Linux-mm <linux-mm@kvack.org>, Arnaldo Carvalho de Melo <acme@infradead.org>, Linus Torvalds <torvalds@linux-foundation.org>, Andi Kleen <andi@firstfloor.org>, Hugh Dickins <hughd@google.com>, Christoph Hellwig <hch@infradead.org>, Jonathan Corbet <corbet@lwn.net>, Thomas Gleixner <tglx@linutronix.de>, Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>, Oleg Nesterov <oleg@redhat.com>, LKML <linux-kernel@vger.kernel.org>, Jim Keniston <jkenisto@linux.vnet.ibm.com>, Roland McGrath <roland@hack.frob.com>, Ananth N Mavinakayanahalli <ananth@in.ibm.com>, Andrew Morton <akpm@linux-foundation.org>

On Mon, 2011-07-18 at 14:50 +0530, Srikar Dronamraju wrote:
>  *  - Introduce uprobes_list and uprobes_vaddr in vm_area_struct.
>  *    uprobes_list is a node in the temp list of vmas while
>  *    registering/unregistering uprobes. uprobes_vaddr caches the vaddr t=
o
>  *    insert/remove the breakpoint.
>  *
>  *  - Introduce srcu to synchronize vma deletion with walking the list of
>  *    vma in register/unregister_uprobe.

I don't think you can sell this, that'll make munmap() horridly slow.

>  *  - Introduce uprobes_mmap_mutex to synchronize uprobe deletion and
>  *    mmap_uprobe().=20

Yes, that'll work I think.

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