From: Steven Rostedt <rostedt@goodmis.org>
To: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org
Subject: Re: [PATCH v9 3/3] tracing/Documentation: Add a section about backup instance
Date: Wed, 1 Apr 2026 10:41:20 -0400 [thread overview]
Message-ID: <20260401104120.0e4a364a@gandalf.local.home> (raw)
In-Reply-To: <20260401121541.e2c8c549ae172ccf2d5e3035@kernel.org>
On Wed, 1 Apr 2026 12:15:41 +0900
Masami Hiramatsu (Google) <mhiramat@kernel.org> wrote:
> > > +It is also possible to record trace data at system boot time by specifying
> > > +events with the persistent ring buffer, but in this case the data before the
> > > +reboot will be lost before it can be read. This problem can be solved by a
> > > +backup instance. From the kernel command line::
> > > +
> > > + reserve_mem=12M:4096:trace trace_instance=boot_map@trace,sched,irq trace_instance=backup=boot_map
> >
> > The above didn't actually work well without my patch to enable events on
> > the persistent ring buffer with the backup. But keep it, as it will work
> > with my patch ;-)
>
> Ah, thanks!
> Let me rebase on it.
Well, my patch hasn't been added yet ;-) But don't change anything. When
this goes upstream both patches should have been applied.
-- Steve
prev parent reply other threads:[~2026-04-01 14:40 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-31 16:32 [PATCH v9 0/3] tracing: Remove backup instance after read all Masami Hiramatsu (Google)
2026-03-31 16:32 ` [PATCH v9 1/3] tracing: Make the backup instance non-reusable Masami Hiramatsu (Google)
2026-03-31 16:32 ` [PATCH v9 2/3] tracing: Remove the backup instance automatically after read Masami Hiramatsu (Google)
2026-03-31 21:19 ` Steven Rostedt
2026-04-01 3:19 ` Masami Hiramatsu
2026-04-01 14:40 ` Steven Rostedt
2026-04-02 13:19 ` Masami Hiramatsu
2026-04-02 14:52 ` Steven Rostedt
2026-03-31 16:32 ` [PATCH v9 3/3] tracing/Documentation: Add a section about backup instance Masami Hiramatsu (Google)
2026-03-31 21:21 ` Steven Rostedt
2026-04-01 3:15 ` Masami Hiramatsu
2026-04-01 14:41 ` Steven Rostedt [this message]
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