linux-kernel - Re: [RFC] [PATCH] To improve kretprobe scalability

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Date:	Thu, 22 May 2008 12:37:20 +0530
From:	"Abhishek Sagar" <sagar.abhishek@...il.com>
To:	"Srinivasa D S" <srinivasa@...ibm.com>,
	"Jim Keniston" <jkenisto@...ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ananth Mavinakayanahalli" <ananth@...ibm.com>,
	"Masami Hiramatsu" <mhiramat@...hat.com>,
	"Srikar Dronamraju" <srikar@...ux.vnet.ibm.com>
Subject: Re: [RFC] [PATCH] To improve kretprobe scalability

On 5/21/08, Srinivasa D S <srinivasa@...ibm.com> wrote:
>  Solution:
>    1) Instead of having one global lock to protect kretprobe instances
>  present in kretprobe object and kretprobe hash table. We will have two locks,
>  one lock for protecting kretprobe hash table and another lock for kretporbe
>  object.

Is it possible to get rid of the kretprobe hash table itself and lose
the kretprobe_lock? It seems like it is just doing a pid-to-instance
mapping. These return instances could be queued in the "current"
task_struct in a LIFO manner. Mutation to this per-task list can be
done with local irqs off...

--
Regards,
Abhishek Sagar
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