Date: Wed, 8 Apr 2009 12:10:56 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
       Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
       Jim Keniston <jkenisto@us.ibm.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       Vegard Nossum <vegard.nossum@gmail.com>,
       "H. Peter Anvin" <hpa@zytor.com>, Steven Rostedt <rostedt@goodmis.org>,
       Andi Kleen <andi@firstfloor.org>, Avi Kivity <avi@redhat.com>,
       "Frank Ch. Eigler" <fche@redhat.com>,
       Satoshi Oshima <satoshi.oshima.fk@hitachi.com>,
       systemtap-ml <systemtap@sources.redhat.com>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC][PROTO][PATCH -tip 0/7] kprobes: support jump optimization
	on x86
Message-ID: <20090408101056.GA14482@elte.hu>
References: <49DA7702.5030308@redhat.com> <20090408011743.GB5977@nowhere> <49DC0307.6080107@redhat.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <49DC0307.6080107@redhat.com>
User-Agent: Mutt/1.5.18 (2008-05-17)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 760
Lines: 20


* Masami Hiramatsu <mhiramat@redhat.com> wrote:

> > But can we consider it as a small problem, assuming that kprobes 
> > are rarely intended for a massive use in once? I guess that 
> > usually, not a lot of functions are probed simultaneously.
> 
> Hm, yes and no, systemtap may use massive kprobes, because it 
> supports "wildcard" probes. However, optimizing in default may be 
> acceptable.

I'm curious: what is the biggest kprobe count you've ever seen, in 
the field? 1000? 10,000? 100,000? More?

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/