From: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
To: Peter Zijlstra <peterz@infradead.org>
Cc: mingo@elte.hu, linux-kernel@vger.kernel.org,
Paul Mackerras <paulus@samba.org>,
Frederic Weisbecker <fweisbec@gmail.com>
Subject: Re: [PATCH 2/2] perf lock: Fix output of tracing lock events
Date: Sat, 26 Dec 2009 22:43:44 +0900 [thread overview]
Message-ID: <a6b9f31a0912260543g62785a58w6432f546c2fa6488@mail.gmail.com> (raw)
In-Reply-To: <1261041885.27920.110.camel@laptop>
Sorry for my slow response...
>> diff --git a/include/trace/events/lock.h b/include/trace/events/lock.h
>> index a870ba1..2f94e25 100644
>> --- a/include/trace/events/lock.h
>> +++ b/include/trace/events/lock.h
>> @@ -18,16 +18,19 @@ TRACE_EVENT(lock_acquire,
>> TP_ARGS(lock, subclass, trylock, read, check, next_lock, ip),
>>
>> TP_STRUCT__entry(
>> + __field(struct lockdep_map *, lockdep_addr)
>> __field(unsigned int, flags)
>> __string(name, lock->name)
>> ),
>
> I feel a bit awkward explicitly leaking kernel pointers like that. All
> this is accessible by root only (for now) so its not too harmfull, but
> sitll.
>
> Also, I don't think we want to expose the struct lockdep_map thing, a
> regular void * would be better.
Yeah, I agree with it. void * is enough.
>
> As to removing the waittime, I'm not sure, in this case, yes, but if you
> want some other processing that hooks straight into the tracepoints
> instead of using a logging structure, it might be useful.
>
> Removing that do_div() from there and exposing waittime as u64 in nsec,
> for sure, that do_div() is just silly.
>
>
>
I was too egoist. perf lock is not an only one user of lock events.
And I have a suggestion. Adding name of source files and lines of
lock instances may be good thing for human's readability.
How do you think?
I have some pending works for these (not made into patches).
If you agree, I'll send these later.
next prev parent reply other threads:[~2009-12-26 13:43 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-16 3:28 [PATCH 1/2] perf: Add util/include/linuxhash.h to include hash.h of kernel Hitoshi Mitake
2009-12-16 3:28 ` [PATCH 2/2] perf lock: Fix output of tracing lock events Hitoshi Mitake
2009-12-16 8:19 ` [tip:perf/lock] " tip-bot for Hitoshi Mitake
2009-12-17 8:50 ` [PATCH 2/2] " Ingo Molnar
2009-12-17 9:24 ` Peter Zijlstra
2009-12-17 10:09 ` Ingo Molnar
2009-12-17 10:26 ` Peter Zijlstra
2009-12-17 10:51 ` Ingo Molnar
2009-12-26 13:43 ` Hitoshi Mitake [this message]
2009-12-28 10:01 ` Peter Zijlstra
2009-12-31 13:24 ` Hitoshi Mitake
2010-01-07 10:38 ` Hitoshi Mitake
2010-01-07 10:39 ` [PATCH 0/5] lockdep: Add information of file and line to lockdep_map Hitoshi Mitake
2010-01-13 9:52 ` Peter Zijlstra
2010-01-13 10:09 ` Ingo Molnar
2010-01-16 13:01 ` Hitoshi Mitake
2010-01-18 7:20 ` Peter Zijlstra
2010-01-26 5:56 ` [PATCH] Add type of locks to lock trace events Hitoshi Mitake
2010-01-28 10:21 ` Peter Zijlstra
2010-01-29 17:29 ` Frederic Weisbecker
2010-01-29 17:41 ` Peter Zijlstra
2010-01-29 22:12 ` Frederic Weisbecker
2010-02-24 9:02 ` [PATCH] Separate lock events with types Hitoshi Mitake
2010-03-26 23:33 ` Frederic Weisbecker
2010-04-05 10:37 ` Hitoshi Mitake
2010-04-06 8:26 ` Peter Zijlstra
2010-04-06 9:44 ` Frederic Weisbecker
2010-01-07 10:39 ` [PATCH 1/5] lockdep: Add file and line to initialize sequence of spin and rw lock Hitoshi Mitake
2010-01-07 10:39 ` [PATCH 2/5] lockdep: Add file and line to initialize sequence of rwsem Hitoshi Mitake
2010-01-07 10:39 ` [PATCH 3/5] " Hitoshi Mitake
2010-01-07 10:39 ` [PATCH 4/5] lockdep: Add file and line to initialize sequence of mutex Hitoshi Mitake
2010-01-07 10:39 ` [PATCH 5/5] lockdep: Fix the way to initialize class_mutex for information of file and line Hitoshi Mitake
2010-01-13 10:00 ` Ingo Molnar
2010-01-13 23:17 ` Greg KH
2010-01-13 23:19 ` Greg KH
2010-01-16 12:55 ` Hitoshi Mitake
2009-12-16 8:18 ` [tip:perf/lock] perf: Add util/include/linuxhash.h to include hash.h of kernel tip-bot for Hitoshi Mitake
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