linux-kernel - Re: [PATCH 1/3] jump label: add enabled/disabled state to jump label key entries

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Message-ID: <1290614246.30543.536.camel@gandalf.stny.rr.com>
Date:	Wed, 24 Nov 2010 10:57:26 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jason Baron <jbaron@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, mingo@...e.hu,
	mathieu.desnoyers@...ymtl.ca, hpa@...or.com, tglx@...utronix.de,
	andi@...stfloor.org, roland@...hat.com, rth@...hat.com,
	masami.hiramatsu.pt@...achi.com, fweisbec@...il.com,
	avi@...hat.com, davem@...emloft.net, sam@...nborg.org,
	ddaney@...iumnetworks.com, michael@...erman.id.au,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] jump label: add enabled/disabled state to jump
 label key entries

On Wed, 2010-11-24 at 10:21 -0500, Jason Baron wrote:

> The keys are simply the address of a variable or structure (so as to be
> unique). We can put pointers or anything else in the variable.

Note, there is not a 1 to 1 with keys and places that need to be
patched.

Doing the following objdump:

  objdump -dr vmlinux | grep 'jmpq.*<trace_kmalloc' | wc -l
375

That's 375 instances of kmalloc tracepoints[*] and one key. How do you
handle this?

-- Steve




[*] this should be fixed, we probably should find a way to move the
tracepoint into the kmalloc functions that are not inlined.

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