linux-kernel - Re: [PATCH 2/2] tracing: syscall_regfunc() should not skip kernel threads

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Message-ID: <32387.1363705826@warthog.procyon.org.uk>
Date:	Tue, 19 Mar 2013 15:10:26 +0000
From:	David Howells <dhowells@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	dhowells@...hat.com, Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH 2/2] tracing: syscall_regfunc() should not skip kernel threads

Steven Rostedt <rostedt@...dmis.org> wrote:

> Why? If we remove the tracepoint from the slowpath and use a table swap,
> then we wouldn't need to use the slowpath at all.

How are you engineering a table swap?  Do you patch the system call code to
change the immediate address loaded or do you put in a level of indirection?

David
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