From: Peter Zijlstra <peterz@infradead.org>
To: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
linux-kernel@vger.kernel.org, h.mitake@gmail.com,
Ingo Molnar <mingo@elte.hu>, Paul Mackerras <paulus@samba.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Jason Baron <jbaron@redhat.com>,
Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>,
Jens Axboe <axboe@kernel.dk>
Subject: Re: [PATCH RFC] perf lock: Add new event "lock_acquired_waittime" for contention analysis
Date: Mon, 02 Aug 2010 14:23:04 +0200 [thread overview]
Message-ID: <1280751784.1923.146.camel@laptop> (raw)
In-Reply-To: <4C5507F2.7090503@dcl.info.waseda.ac.jp>
On Sun, 2010-08-01 at 14:36 +0900, Hitoshi Mitake wrote:
> I want to make lockdep production kernel feature with dynamic
> patching.
Not really feasible. Note that enabling lockdep grows the size of
spinlock_t (and others) quite significantly.
Then there is the problem that you need to pass all tasks through some
quiesent state in order to enable lockdep (there must be a guarantee of
no locks held).
Now, we could possibly make it all work, but I'm not at all convinced we
want to pay the price, which is a much _much_ more complex
infrastructure.
next prev parent reply other threads:[~2010-08-02 12:24 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-24 16:55 Hitoshi Mitake
2010-07-28 16:39 ` Frederic Weisbecker
2010-08-01 5:36 ` Hitoshi Mitake
2010-08-01 7:56 ` Hitoshi Mitake
2010-08-02 12:23 ` Peter Zijlstra [this message]
2010-08-03 7:37 ` Hitoshi Mitake
2010-08-03 8:00 ` Peter Zijlstra
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