From: Alexei Starovoitov <ast@plumgrid.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Daniel Wagner <wagi@monom.org>,
paulmck@linux.vnet.ibm.com,
Daniel Wagner <daniel.wagner@bmw-carit.de>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: call_rcu from trace_preempt
Date: Tue, 16 Jun 2015 18:04:39 -0700 [thread overview]
Message-ID: <5580C7A7.5040705@plumgrid.com> (raw)
In-Reply-To: <20150616204711.0e6ea1d7@grimm.local.home>
On 6/16/15 5:47 PM, Steven Rostedt wrote:
> Do what I do in tracing. Use a bit (per cpu?) test.
>
> Add the element to the list (that will be a cmpxchg, but I'm not sure
> you can avoid it), then check the bit to see if the irq work is already
> been activated. If not, then activate the irq work and set the bit.
> Then you will not have any more cmpxchg in the fast path.
you mean similar to what rb_wakeups() and friends are doing?
makes sense. starting to study it...
next prev parent reply other threads:[~2015-06-17 1:04 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-15 22:24 call_rcu from trace_preempt Alexei Starovoitov
2015-06-15 23:07 ` Paul E. McKenney
2015-06-16 1:09 ` Alexei Starovoitov
2015-06-16 2:14 ` Paul E. McKenney
2015-06-16 5:45 ` Alexei Starovoitov
2015-06-16 6:06 ` Daniel Wagner
2015-06-16 6:25 ` Alexei Starovoitov
2015-06-16 6:34 ` Daniel Wagner
2015-06-16 6:46 ` Alexei Starovoitov
2015-06-16 6:54 ` Daniel Wagner
2015-06-16 12:27 ` Paul E. McKenney
2015-06-16 12:38 ` Daniel Wagner
2015-06-16 14:16 ` Paul E. McKenney
2015-06-16 15:43 ` Steven Rostedt
2015-06-16 16:07 ` Paul E. McKenney
2015-06-16 17:13 ` Daniel Wagner
2015-06-16 15:41 ` Steven Rostedt
2015-06-16 15:52 ` Steven Rostedt
2015-06-16 17:11 ` Daniel Wagner
2015-06-16 17:20 ` Alexei Starovoitov
2015-06-16 17:37 ` Steven Rostedt
2015-06-17 0:33 ` Alexei Starovoitov
2015-06-17 0:47 ` Steven Rostedt
2015-06-17 1:04 ` Alexei Starovoitov [this message]
2015-06-17 1:19 ` Steven Rostedt
2015-06-17 8:11 ` Daniel Wagner
2015-06-17 9:05 ` Daniel Wagner
2015-06-17 18:39 ` Alexei Starovoitov
2015-06-17 20:37 ` Paul E. McKenney
2015-06-17 20:53 ` Alexei Starovoitov
2015-06-17 21:36 ` Paul E. McKenney
2015-06-17 23:58 ` Alexei Starovoitov
2015-06-18 0:20 ` Paul E. McKenney
2015-06-16 15:37 ` Steven Rostedt
2015-06-16 16:05 ` Paul E. McKenney
2015-06-16 17:14 ` Alexei Starovoitov
2015-06-16 17:39 ` Paul E. McKenney
2015-06-16 18:57 ` Steven Rostedt
2015-06-16 19:20 ` Paul E. McKenney
2015-06-16 19:29 ` Steven Rostedt
2015-06-16 19:34 ` Paul E. McKenney
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