From: Byungchul Park <byungchul.park@lge.com>
To: xinhui <xinhui.pan@linux.vnet.ibm.com>
Cc: peterz@infradead.org, mingo@kernel.org,
linux-kernel@vger.kernel.org, npiggin@suse.de, walken@google.com,
ak@suse.de
Subject: Re: [RFC 12/12] x86/dumpstack: Optimize save_stack_trace
Date: Fri, 1 Jul 2016 08:06:08 +0900 [thread overview]
Message-ID: <20160630230608.GS2279@X58A-UD3R> (raw)
In-Reply-To: <5774F6B7.5050200@linux.vnet.ibm.com>
On Thu, Jun 30, 2016 at 06:38:47PM +0800, xinhui wrote:
> >>>>+static int save_stack_end(void *data)
> >>>>+{
> >>>>+ struct stack_trace *trace = data;
> >>>>+ return trace->nr_entries >= trace->max_entries;
> >>>>+}
> >>>>+
> >>>> static const struct stacktrace_ops save_stack_ops = {
> >>>> .stack = save_stack_stack,
> >>>> .address = save_stack_address,
> >>>then why not check the return value of ->address(), -1 indicate there is
> >>>no room to store any pointer.
> >>
> >>Hello,
> >>
> >>Indeed. It also looks good to me even though it has to propagate the condition
> >>between callback functions. I will modify it if it's better.
> >
> >Do you also think it would be better to make it propagate the result of
> >->address() rather than add a new callback, say, end_walk?
> >
> It's up to you. In my opinion, end_walk is better for reading.
I also prefer the way this patch works.
> >>
> >>Thank you.
> >>Byungchul
> >>
> >>>
> >>>> .walk_stack = print_context_stack,
> >>>>+ .end_walk = save_stack_end,
> >>>> };
> >>>>
> >>>> static const struct stacktrace_ops save_stack_ops_nosched = {
> >>>>
> >
next prev parent reply other threads:[~2016-06-30 23:07 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-20 4:55 [RFC 00/12] lockdep: Implement crossrelease feature Byungchul Park
2016-06-20 4:55 ` [RFC 01/12] lockdep: Refactor lookup_chain_cache() Byungchul Park
2016-06-20 4:55 ` [RFC 02/12] lockdep: Add a function building a chain between two hlocks Byungchul Park
2016-06-20 4:55 ` [RFC 03/12] lockdep: Make check_prev_add can use a stack_trace of other context Byungchul Park
2016-06-20 4:55 ` [RFC 04/12] lockdep: Make save_trace can copy from other stack_trace Byungchul Park
2016-06-20 4:55 ` [RFC 05/12] lockdep: Implement crossrelease feature Byungchul Park
2016-06-30 13:03 ` Peter Zijlstra
2016-06-30 23:28 ` Byungchul Park
2016-06-20 4:55 ` [RFC 06/12] lockdep: Apply crossrelease to completion Byungchul Park
2016-06-20 4:55 ` [RFC 07/12] pagemap.h: Remove trailing white space Byungchul Park
2016-06-20 4:55 ` [RFC 08/12] lockdep: Apply crossrelease to PG_locked lock Byungchul Park
2016-06-30 13:04 ` Peter Zijlstra
2016-06-30 23:21 ` Byungchul Park
2016-07-01 8:10 ` Peter Zijlstra
2016-07-01 11:18 ` Kirill A. Shutemov
2016-07-04 4:30 ` Byungchul Park
2016-06-20 4:55 ` [RFC 09/12] cifs/file.c: Remove trailing white space Byungchul Park
2016-06-20 4:55 ` [RFC 10/12] mm/swap_state.c: " Byungchul Park
2016-06-20 4:55 ` [RFC 11/12] lockdep: Call lock_acquire(release) when accessing PG_locked manually Byungchul Park
2016-06-20 4:55 ` [RFC 12/12] x86/dumpstack: Optimize save_stack_trace Byungchul Park
2016-06-20 7:29 ` xinhui
2016-06-20 7:50 ` byungchul.park
2016-06-29 12:43 ` Byungchul Park
2016-06-30 10:38 ` xinhui
2016-06-30 23:06 ` Byungchul Park [this message]
2016-06-23 23:37 ` [RFC 00/12] lockdep: Implement crossrelease feature Byungchul Park
2016-06-24 7:08 ` Peter Zijlstra
2016-06-24 11:13 ` Byungchul Park
2016-06-24 11:26 ` Nikolay Borisov
2016-06-27 1:34 ` Byungchul Park
2016-07-01 4:15 ` [PATCH] lockdep: Add a document describing " Byungchul Park
2016-07-01 10:45 ` Peter Zijlstra
2016-07-04 6:42 ` Byungchul Park
2016-07-06 0:49 ` Boqun Feng
2016-07-06 2:17 ` Byungchul Park
2016-07-06 5:33 ` Byungchul Park
2016-07-06 7:56 ` Peter Zijlstra
2016-07-06 8:12 ` Byungchul Park
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