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Re: [PACTH v1] trace: Add trace events for open(), exec() and uselib()

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On 2016-08-01 02:10 PM, Al Viro wrote:
> On Mon, Aug 01, 2016 at 01:25:40PM -0400, robert.foss@collabora.com wrote:
>> From: Scott James Remnant <scott@ubuntu.com>
>>
>> This patch uses TRACE_EVENT to add tracepoints for the open(),
>> exec() and uselib() syscalls so that ureadahead can cheaply trace
>> the boot sequence to determine what to read to speed up the next.
>
> NAK.  No Tracepoints In VFS.  Not going to happen - any tracepoint can all too
> easily become a cast-in-stone userland ABI.
>

Hey Al,

I'm slightly unfamiliar with this territory, so please forgive my lack 
of knowledge of this topic.

What is the negative side of having tracepoint be a permanent fixture in 
the VFS ABI?
And how is VFS different from other subsystems in that regard?


Rob.

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[PACTH v1] trace: Add trace events for open(), exec() and uselib() robert.foss@collabora.com - 2016-08-01 19:30 +0200
  Re: [PACTH v1] trace: Add trace events for open(), exec() and  uselib() Al Viro <viro@ZenIV.linux.org.uk> - 2016-08-01 20:20 +0200
  Re: [PACTH v1] trace: Add trace events for open(), exec() and  uselib() Steven Rostedt <rostedt@goodmis.org> - 2016-08-01 20:30 +0200
  Re: [PACTH v1] trace: Add trace events for open(), exec() and  uselib() Robert Foss <robert.foss@collabora.com> - 2016-08-01 22:00 +0200
    Re: [PACTH v1] trace: Add trace events for open(), exec() and  uselib() Steven Rostedt <rostedt@goodmis.org> - 2016-08-01 23:00 +0200
  Re: [PACTH v1] trace: Add trace events for open(), exec() and  uselib() Al Viro <viro@ZenIV.linux.org.uk> - 2016-08-02 02:10 +0200
    Re: [PACTH v1] trace: Add trace events for open(), exec() and  uselib() Ingo Molnar <mingo@kernel.org> - 2016-08-02 10:30 +0200

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