From: Steven Rostedt <rostedt@goodmis.org>
To: Masami Hiramatsu <mhiramat@kernel.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [for-next][PATCH 09/33] selftests: ftrace: Add test to test reading of set_ftrace_file
Date: Fri, 26 May 2017 11:02:32 -0400 [thread overview]
Message-ID: <20170526110232.3ed3dae1@gandalf.local.home> (raw)
In-Reply-To: <20170522122308.471fc20edada0455c30577da@kernel.org>
On Mon, 22 May 2017 12:23:08 +0900
Masami Hiramatsu <mhiramat@kernel.org> wrote:
> Hi Steve,
>
> On Fri, 21 Apr 2017 17:30:29 -0400
> Steven Rostedt <rostedt@goodmis.org> wrote:
>
> > From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
> >
> > The set_ftrace_file lists both functions that are filtered, as well as
> > function probes (triggers) that are attached to a function, like traceon or
> > stacktrace, etc. The reading of this file is not as trivial as most pseudo
> > files are, and there's been various bugs that have appeared in the past
> > when there's a mix of probes and functions listed. There's also a difference
> > when reading the file using dd with a block size of 1.
>
> Would you know which commit fixed this dd/cat differences on
> set_ftrace_filter? When I've run this test on 4.9-stable kernel,
> it failed because the result of "dd -bs=1" and "cat" on
> set_ftrace_filter were different.
>
Probably one of the patches in this series before this one.
-- Steve
next prev parent reply other threads:[~2017-05-26 15:02 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-21 21:30 [for-next][PATCH 00/33] tracing: More updates for 4.12 Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 01/33] ftrace: Fix removing of second function probe Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 02/33] ftrace: Fix indexing of t_hash_start() from t_next() Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 03/33] tracing: Have the trace_event benchmark thread call cond_resched_rcu_qs() Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 04/33] ftrace: Add function-fork trace option Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 05/33] selftests: ftrace: Add -l/--logdir option Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 06/33] selftests: ftrace: Add a way to reset triggers in the set_ftrace_filter file Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 07/33] selftests: ftrace: Add a selftest to test event enable/disable func trigger Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 08/33] selftests: ftrace: Add a test to test function triggers to start and stop tracing Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 09/33] selftests: ftrace: Add test to test reading of set_ftrace_file Steven Rostedt
2017-05-22 3:23 ` Masami Hiramatsu
2017-05-26 15:02 ` Steven Rostedt [this message]
2017-04-21 21:30 ` [for-next][PATCH 10/33] ftrace: Move the probe function into the tracing directory Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 11/33] ftrace: Move the function commands " Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 12/33] ftrace: Remove unused "flags" field from struct ftrace_func_probe Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 13/33] ftrace: Pass probe ops to probe function Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 14/33] ftrace: Added ftrace_func_mapper for function probe triggers Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 15/33] tracing: Have the snapshot trigger use the mapping helper functions Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 16/33] ftrace: Convert the rest of the function trigger over to the mapping functions Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 17/33] ftrace: Remove unused unregister_ftrace_function_probe() function Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 18/33] ftrace: Remove unused unregister_ftrace_function_probe_all() function Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 19/33] ftrace: Remove printing of data in showing of a function probe Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 20/33] ftrace: Remove data field from ftrace_func_probe structure Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 21/33] ftrace: Add helper function ftrace_hash_move_and_update_ops() Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 22/33] ftrace: Have unregister_ftrace_function_probe_func() return a value Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 23/33] ftrace: Have each function probe use its own ftrace_ops Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 24/33] ftrace: Have the function probes call their own function Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 25/33] ftrace: If the hash for a probe fails to update then free what was initialized Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 26/33] tracing: Have the trace_array hold the list of registered func probes Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 27/33] tracing: Pass the trace_array into ftrace_probe_ops functions Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 28/33] ftrace: Dynamically create the probe ftrace_ops for the trace_array Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 29/33] tracing/ftrace: Add a better way to pass data via the probe functions Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 30/33] tracing/ftrace: Allow instances to have their own function probes Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 31/33] tracing/ftrace: Enable snapshot function trigger to work with instances Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 32/33] tracing/ftrace: Allow for the traceonoff probe be unique to instances Steven Rostedt
2017-04-21 21:30 ` [for-next][PATCH 33/33] tracing/ftrace: Allow for instances to trigger their own stacktrace probes Steven Rostedt
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