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From: Steven Rostedt <rostedt@goodmis.org>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Alexei Starovoitov <ast@kernel.org>
Subject: Re: [for-next][PATCH 2/2] tracing: Use temp buffer when filtering events
Date: Thu, 5 May 2016 11:32:51 -0400	[thread overview]
Message-ID: <20160505113251.71f2e60d@gandalf.local.home> (raw)
In-Reply-To: <20160505152055.GA72567@ast-mbp.thefacebook.com>

On Thu, 5 May 2016 08:20:57 -0700
Alexei Starovoitov <alexei.starovoitov@gmail.com> wrote:


> tricky :)

Thanks ;-)

> so the buffer is used only for non-recursive events.
> If the 2nd event on the same cpu also needs filtering it will
> be going through normal trace_buffer_lock_reserve() path,
> but then it means such events will be out of order if both
> are accepted, right?
> Is that a concern or not?

Well, what is the order?

Think about it, what's the difference if the interrupt came in just
before the trace or just after? It still came in the same location with
respect to the normal flow of the code. The only difference is, where
we recorded it.

-- Steve

  reply	other threads:[~2016-05-05 15:32 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-04 13:52 [for-next][PATCH 0/2] tracing: Use a temp buffer when filtering events Steven Rostedt
2016-05-04 13:52 ` [for-next][PATCH 1/2] tracing: Remove TRACE_EVENT_FL_USE_CALL_FILTER logic Steven Rostedt
2016-05-04 13:52 ` [for-next][PATCH 2/2] tracing: Use temp buffer when filtering events Steven Rostedt
2016-05-05 15:20   ` Alexei Starovoitov
2016-05-05 15:32     ` Steven Rostedt [this message]
2016-05-05 15:35       ` Steven Rostedt
2016-05-05 15:40         ` Alexei Starovoitov
2020-08-28  7:53   ` Wen Gong
2020-08-28  7:53     ` Wen Gong
2020-08-28  7:53     ` Wen Gong
2020-08-28 22:49     ` Steven Rostedt
2020-08-28 22:49       ` Steven Rostedt
2020-08-28 22:49       ` Steven Rostedt
2020-08-28 22:54       ` Steven Rostedt
2020-08-28 22:54         ` Steven Rostedt
2020-08-28 22:54         ` Steven Rostedt
2020-08-28 22:55         ` Steven Rostedt
2020-08-28 22:55           ` Steven Rostedt
2020-08-28 22:55           ` Steven Rostedt
2020-08-29 15:52           ` Wen Gong
2020-08-29 15:52             ` Wen Gong
2020-08-29 15:52             ` Wen Gong

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