From: Jens Remus <jremus@linux.ibm.com>
To: Steven Rostedt <rostedt@kernel.org>,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
bpf@vger.kernel.org, x86@kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Josh Poimboeuf <jpoimboe@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Andrii Nakryiko <andrii@kernel.org>,
Indu Bhagat <indu.bhagat@oracle.com>,
"Jose E. Marchesi" <jemarch@gnu.org>,
Beau Belgrave <beaub@linux.microsoft.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Jens Axboe <axboe@kernel.dk>, Florian Weimer <fweimer@redhat.com>,
Sam James <sam@gentoo.org>
Subject: Re: [PATCH v15 02/10] unwind_user/deferred: Add unwind_user_faultable()
Date: Mon, 28 Jul 2025 17:29:31 +0200 [thread overview]
Message-ID: <a47d0d23-8518-4146-b97a-bf18753bc483@linux.ibm.com> (raw)
In-Reply-To: <20250725185739.399622407@kernel.org>
On 25.07.2025 20:55, Steven Rostedt wrote:
> From: Steven Rostedt <rostedt@goodmis.org>
>
> Add a new API to retrieve a user space callstack called
> unwind_user_faultable(). The difference between this user space stack
> tracer from the current user space stack tracer is that this must be
> called from faultable context as it may use routines to access user space
> data that needs to be faulted in.
>
> It can be safely called from entering or exiting a system call as the code
> can still be faulted in there.
>
> This code is based on work by Josh Poimboeuf's deferred unwinding code:
>
> Link: https://lore.kernel.org/all/6052e8487746603bdb29b65f4033e739092d9925.1737511963.git.jpoimboe@kernel.org/
>
> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Reviewed-by: Jens Remus <jremus@linux.ibm.com>
> ---
> include/linux/sched.h | 5 +++
> include/linux/unwind_deferred.h | 24 +++++++++++
> include/linux/unwind_deferred_types.h | 9 ++++
> kernel/fork.c | 4 ++
> kernel/unwind/Makefile | 2 +-
> kernel/unwind/deferred.c | 60 +++++++++++++++++++++++++++
> 6 files changed, 103 insertions(+), 1 deletion(-)
> create mode 100644 include/linux/unwind_deferred.h
> create mode 100644 include/linux/unwind_deferred_types.h
> create mode 100644 kernel/unwind/deferred.c
Regards,
Jens
--
Jens Remus
Linux on Z Development (D3303)
+49-7031-16-1128 Office
jremus@de.ibm.com
IBM
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next prev parent reply other threads:[~2025-07-28 15:30 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-25 18:55 [PATCH v15 00/10] unwind_user: Deferred unwinding infrastructure Steven Rostedt
2025-07-25 18:55 ` [PATCH v15 01/10] unwind_user: Add user space unwinding API with frame pointer support Steven Rostedt
2025-07-28 15:24 ` Jens Remus
2025-07-28 16:08 ` Steven Rostedt
2025-07-25 18:55 ` [PATCH v15 02/10] unwind_user/deferred: Add unwind_user_faultable() Steven Rostedt
2025-07-28 15:29 ` Jens Remus [this message]
2025-07-25 18:55 ` [PATCH v15 03/10] unwind_user/deferred: Add unwind cache Steven Rostedt
2025-07-28 15:46 ` Jens Remus
2025-07-28 16:15 ` Steven Rostedt
2025-07-25 18:55 ` [PATCH v15 04/10] unwind_user/deferred: Add deferred unwinding interface Steven Rostedt
2025-07-25 18:55 ` [PATCH v15 05/10] unwind_user/deferred: Make unwind deferral requests NMI-safe Steven Rostedt
2025-07-25 18:55 ` [PATCH v15 06/10] unwind deferred: Use bitmask to determine which callbacks to call Steven Rostedt
2025-07-25 18:55 ` [PATCH v15 07/10] unwind deferred: Add unwind_completed mask to stop spurious callbacks Steven Rostedt
2025-07-25 18:55 ` [PATCH v15 08/10] unwind: Add USED bit to only have one conditional on way back to user space Steven Rostedt
2025-07-25 18:55 ` [PATCH v15 09/10] unwind deferred: Use SRCU unwind_deferred_task_work() Steven Rostedt
2025-07-25 18:55 ` [PATCH v15 10/10] unwind: Finish up unwind when a task exits Steven Rostedt
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