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From: David Laight <David.Laight@ACULAB.COM>
To: 'Steven Rostedt' <rostedt@goodmis.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	"Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
	Peter Wu <peter@lekensteyn.nl>, Jonathan Corbet <corbet@lwn.net>,
	Tom Zanussi <zanussi@kernel.org>,
	"Shuah Khan" <shuahkhan@gmail.com>, bpf <bpf@vger.kernel.org>
Subject: RE: [PATCH 00/12 v2] ring-buffer/tracing: Remove disabling of ring buffer while reading trace file
Date: Fri, 27 Mar 2020 14:56:08 +0000	[thread overview]
Message-ID: <c87eadc38d614b73a2c73f521fecb877@AcuMS.aculab.com> (raw)
In-Reply-To: <20200327103046.08f06131@gandalf.local.home>

From: Steven Rostedt
> Sent: 27 March 2020 14:31
..
> > Along with the one that lets you read the raw trace and get EOF.
> 
> Can you explain this more? I think we talked about this before, but I don't
> remember the details.

I was trying to use schedviz (on github from google).
It reads out the raw trace (for some scheduler events)
and then postprocesses it to generate to nice pictures.
However the shell script it uses for the captures has to run the
copies in the background, sleep a random time, and then kill all
the copies having hoped it has waited long enough - truly horrid.

There is also some confusion (IIRC between a header and your library
code) about the 'time-delta' on 'pad' entries.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)


      reply	other threads:[~2020-03-27 14:56 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-19 23:22 [PATCH 00/12 v2] ring-buffer/tracing: Remove disabling of ring buffer while reading trace file Steven Rostedt
2020-03-19 23:22 ` [PATCH 01/12 v2] selftest/ftrace: Fix function trigger test to handle trace not disabling the tracer Steven Rostedt
2020-03-19 23:22 ` [PATCH 02/12 v2] tracing: Save off entry when peeking at next entry Steven Rostedt
2020-03-20  2:57   ` Masami Hiramatsu
2020-03-26  9:12   ` [tracing] cd8f62b481: BUG:sleeping_function_called_from_invalid_context_at_mm/slab.h kernel test robot
2020-04-01 14:07     ` Masami Hiramatsu
2020-04-01 14:21       ` Steven Rostedt
2020-04-01 15:04         ` Steven Rostedt
2020-04-02  7:19           ` Masami Hiramatsu
2020-04-02 18:14             ` Steven Rostedt
2020-04-03  6:47               ` Masami Hiramatsu
2020-04-03 13:16                 ` Steven Rostedt
2020-03-19 23:22 ` [PATCH 03/12 v2] ring-buffer: Have ring_buffer_empty() not depend on tracing stopped Steven Rostedt
2020-03-19 23:22 ` [PATCH 04/12 v2] ring-buffer: Rename ring_buffer_read() to read_buffer_iter_advance() Steven Rostedt
2020-03-19 23:22 ` [PATCH 05/12 v2] ring-buffer: Add page_stamp to iterator for synchronization Steven Rostedt
2020-03-19 23:22 ` [PATCH 06/12 v2] ring-buffer: Have rb_iter_head_event() handle concurrent writer Steven Rostedt
2020-03-19 23:22 ` [PATCH 07/12 v2] ring-buffer: Do not die if rb_iter_peek() fails more than thrice Steven Rostedt
2020-03-19 23:22 ` [PATCH 08/12 v2] ring-buffer: Optimize rb_iter_head_event() Steven Rostedt
2020-03-19 23:22 ` [PATCH 09/12 v2] ring-buffer: Do not disable recording when there is an iterator Steven Rostedt
2020-03-19 23:22 ` [PATCH 10/12 v2] tracing: Do not disable tracing when reading the trace file Steven Rostedt
2020-03-19 23:22 ` [PATCH 11/12 v2] ring-buffer/tracing: Have iterator acknowledge dropped events Steven Rostedt
2020-03-19 23:22 ` [PATCH 12/12 v2] tracing: Have the document reflect that the trace file keeps tracing enabled Steven Rostedt
2020-03-21 19:13 ` [PATCH 00/12 v2] ring-buffer/tracing: Remove disabling of ring buffer while reading trace file David Laight
2020-03-22 18:07   ` Steven Rostedt
2020-03-27  1:46   ` Steven Rostedt
2020-03-27 10:07     ` David Laight
2020-03-27 14:30       ` Steven Rostedt
2020-03-27 14:56         ` David Laight [this message]

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