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From: Sam James <sam@gentoo.org>
To: Namhyung Kim <namhyung@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>,
	 fweimer@redhat.com, akpm@linux-foundation.org,
	 andrii@kernel.org,  axboe@kernel.dk, beaub@linux.microsoft.com,
	 bpf@vger.kernel.org,  indu.bhagat@oracle.com, jemarch@gnu.org,
	 jolsa@kernel.org,  jpoimboe@kernel.org, jremus@linux.ibm.com,
	 linux-kernel@vger.kernel.org,
	linux-trace-kernel@vger.kernel.org,
	 mathieu.desnoyers@efficios.com, mhiramat@kernel.org,
	 mingo@kernel.org,  peterz@infradead.org, tglx@linutronix.de,
	 torvalds@linux-foundation.org,  x86@kernel.org
Subject: Re: [PATCH v11 00/14] unwind_user: x86: Deferred unwinding infrastructure
Date: Thu, 03 Jul 2025 05:01:12 +0100	[thread overview]
Message-ID: <87plehkjnb.fsf@gentoo.org> (raw)
In-Reply-To: <aGVo9b1xiT1Moq-P@google.com>

Namhyung Kim <namhyung@kernel.org> writes:

> On Wed, Jul 02, 2025 at 12:15:02PM -0400, Steven Rostedt wrote:
>> On Wed, 02 Jul 2025 12:44:51 +0100
>> Sam James <sam@gentoo.org> wrote:
>> 
>> > In one of the commit messages in the perf series, Steven also gave
>> > `perf record -g -vv true` which was convenient for making sure it's
>> > correctly discovered deferred unwinding support.
>> 
>> Although I posted the patch, the command "perf record -g -vv true" was
>> Namhyung's idea. Just wanted to give credit where credit was due.
>
> Yep, it's to check if perf tool ask the deferred callchain to the
> kernel.  To check if the kernel returns the callchain properly is:
>
>   $ perf report -D | grep -A5 CALLCHAIN_DEFERRED

Thanks both. I'll update my notes and tinker more.

>
> Thanks,
> Namhyung

sam

  reply	other threads:[~2025-07-03  4:01 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-06-25 22:56 [PATCH v11 00/14] unwind_user: x86: Deferred unwinding infrastructure Steven Rostedt
2025-06-25 22:56 ` [PATCH v11 01/14] unwind_user: Add user space unwinding API Steven Rostedt
2025-06-25 22:56 ` [PATCH v11 02/14] unwind_user: Add frame pointer support Steven Rostedt
2025-06-25 22:56 ` [PATCH v11 03/14] unwind_user: Add compat mode " Steven Rostedt
2025-06-25 22:56 ` [PATCH v11 04/14] unwind_user/deferred: Add unwind_user_faultable() Steven Rostedt
2025-06-25 22:56 ` [PATCH v11 05/14] unwind_user/deferred: Add unwind cache Steven Rostedt
2025-06-25 22:56 ` [PATCH v11 06/14] unwind_user/deferred: Add deferred unwinding interface Steven Rostedt
2025-06-26 16:48   ` Steven Rostedt
2025-06-26 20:34     ` Steven Rostedt
2025-06-25 22:56 ` [PATCH v11 07/14] unwind_user/deferred: Make unwind deferral requests NMI-safe Steven Rostedt
2025-06-25 22:56 ` [PATCH v11 08/14] unwind deferred: Use bitmask to determine which callbacks to call Steven Rostedt
2025-06-25 22:56 ` [PATCH v11 09/14] unwind deferred: Use SRCU unwind_deferred_task_work() Steven Rostedt
2025-06-25 22:56 ` [PATCH v11 10/14] unwind: Clear unwind_mask on exit back to user space Steven Rostedt
2025-06-25 22:56 ` [PATCH v11 11/14] unwind: Finish up unwind when a task exits Steven Rostedt
2025-06-25 22:56 ` [PATCH v11 12/14] unwind_user/x86: Enable frame pointer unwinding on x86 Steven Rostedt
2025-06-25 22:56 ` [PATCH v11 13/14] perf/x86: Rename and move get_segment_base() and make it global Steven Rostedt
2025-06-26  8:44   ` Ingo Molnar
2025-06-26 12:13     ` Steven Rostedt
2025-06-26 13:07   ` Peter Zijlstra
2025-06-26 15:13     ` Steven Rostedt
2025-06-25 22:56 ` [PATCH v11 14/14] unwind_user/x86: Enable compat mode frame pointer unwinding on x86 Steven Rostedt
2025-06-26  8:33   ` Ingo Molnar
2025-06-26 12:12     ` Steven Rostedt
2025-06-27 14:01       ` Steven Rostedt
2025-06-27 16:23         ` Linus Torvalds
2025-06-30 12:50 ` [PATCH v11 00/14] unwind_user: x86: Deferred unwinding infrastructure Florian Weimer
2025-06-30 16:35   ` Namhyung Kim
2025-06-30 17:30   ` Steven Rostedt
2025-07-02 11:44   ` Sam James
2025-07-02 16:15     ` Steven Rostedt
2025-07-02 17:14       ` Namhyung Kim
2025-07-03  4:01         ` Sam James [this message]
2025-07-02 17:10     ` Namhyung Kim

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