From owner-freebsd-hackers@FreeBSD.ORG  Wed Jul 30 14:04:25 2014
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 658A1130
 for <freebsd-hackers@freebsd.org>; Wed, 30 Jul 2014 14:04:25 +0000 (UTC)
Received: from vps1.elischer.org (vps1.elischer.org [204.109.63.16])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client CN "vps1.elischer.org",
 Issuer "CA Cert Signing Authority" (not verified))
 by mx1.freebsd.org (Postfix) with ESMTPS id 398132268
 for <freebsd-hackers@freebsd.org>; Wed, 30 Jul 2014 14:04:25 +0000 (UTC)
Received: from Julian-MBP3.local
 (ppp121-45-236-203.lns20.per1.internode.on.net [121.45.236.203])
 (authenticated bits=0)
 by vps1.elischer.org (8.14.9/8.14.9) with ESMTP id s6UE4Ju5022495
 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO);
 Wed, 30 Jul 2014 07:04:22 -0700 (PDT)
 (envelope-from julian@freebsd.org)
Message-ID: <53D8FB5D.2060509@freebsd.org>
Date: Wed, 30 Jul 2014 22:04:13 +0800
From: Julian Elischer <julian@freebsd.org>
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9;
 rv:24.0) Gecko/20100101 Thunderbird/24.6.0
MIME-Version: 1.0
To: suresh gumpula <gsuryacse7k@gmail.com>, freebsd-hackers@freebsd.org
Subject: Re: Allocation/free history
References: <CAJOqHmgO55L-D0_7zpnC0jFR+Y1KWBzFwQirPfknhNeHzd0asg@mail.gmail.com>
In-Reply-To: <CAJOqHmgO55L-D0_7zpnC0jFR+Y1KWBzFwQirPfknhNeHzd0asg@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.18
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
 <freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-hackers>, 
 <mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers/>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
 <mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 30 Jul 2014 14:04:25 -0000

On 7/29/14, 1:40 AM, suresh gumpula wrote:
> Hi,
>     Knowing the PC of an allocation is very usefull in debugging. Having the
> PC hash table and storing the pc hash  either with an object itself( at the
> end) or allocate an exra structure to hold the
> hash index  help us find out who/where an object was allocated.   We
> already have something like this in our own operating system and has been a
> useful thing in debugging.

what OS is that?

I assume you are talking about in the kernel?