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Re: [RFC] [PATCH 2.6.37-rc5-tip 4/20] 4: uprobes: Adding and remove a uprobe in a rb tree.
- From: Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>
- To: Peter Zijlstra <peterz at infradead dot org>
- Cc: Ingo Molnar <mingo at elte dot hu>, Steven Rostedt <rostedt at goodmis dot org>, Arnaldo Carvalho de Melo <acme at infradead dot org>, Linus Torvalds <torvalds at linux-foundation dot org>, Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>, Christoph Hellwig <hch at infradead dot org>, Andi Kleen <andi at firstfloor dot org>, Oleg Nesterov <oleg at redhat dot com>, LKML <linux-kernel at vger dot kernel dot org>, SystemTap <systemtap at sources dot redhat dot com>, Jim Keniston <jkenisto at linux dot vnet dot ibm dot com>, Frederic Weisbecker <fweisbec at gmail dot com>, Ananth N Mavinakayanahalli <ananth at in dot ibm dot com>, Andrew Morton <akpm at linux-foundation dot org>, "Paul E. McKenney" <paulmck at linux dot vnet dot ibm dot com>
- Date: Wed, 26 Jan 2011 14:15:22 +0530
- Subject: Re: [RFC] [PATCH 2.6.37-rc5-tip 4/20] 4: uprobes: Adding and remove a uprobe in a rb tree.
- References: <20101216095714.23751.52601.sendpatchset@localhost6.localdomain6> <20101216095803.23751.41491.sendpatchset@localhost6.localdomain6> <1295963773.28776.1054.camel@laptop>
- Reply-to: Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>
* Peter Zijlstra <peterz@infradead.org> [2011-01-25 14:56:13]:
> On Thu, 2010-12-16 at 15:28 +0530, Srikar Dronamraju wrote:
> > +struct uprobe_consumer {
> > + int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs);
> > + /*
> > + * filter is optional; If a filter exists, handler is run
> > + * if and only if filter returns true.
> > + */
> > + bool (*filter)(struct uprobe_consumer *self, struct task_struct *task);
> > +
> > + struct uprobe_consumer *next;
> > + void *fvalue; /* filter value */
> > +};
>
> Since you pass in a pointer to this structure at register_uprobe() its
> user allocated, hence you can remove the fvalue thing and let the user
> embed this in a larger struct if needed, the filter functions can then
> use container_of() to get at the larger data structure.
Okay, Will do, but Is there a reason for moving the fvalue out of the
uprobe_consumer? Except for reducing the size of the structure, I am
unable to see advantage.