linux-kernel - Re: [PATCH v1 7/10] Uprobes Implementation

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Message-ID: <20100324102252.GA10710@linux.vnet.ibm.com>
Date:	Wed, 24 Mar 2010 15:52:52 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH v1 7/10] Uprobes Implementation

> Anyway, the patch order looks a bit odd, because user_bkpt uses XOL
> but XOL patch is introduced after user_bkpt patch...
> 
user_bkpt provides xol strategy.

user_bkpt_xol patch only provides slot allocation for Execution out of
line strategy.  It doesnt implement execution out of line strategy.
The current implementation assumes that we pass the user_bkpt structure
as an argument while allocating/freeing a slot.

user_bkpt knows how to handle execution out of line. Its working is
independent of how and where the slot is allocated.  The field xol_vaddr
points to a location which holds the copy of the instruction to be
single-stepped/executed.

Hence user_bkpt patch was followed by user_bkpt_xol patch.

--
Thanks and Regards
Srikar

> Thank you,
> 
> -- 
> Masami Hiramatsu
> e-mail: mhiramat@...hat.com
> 
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