From: Steven Rostedt <rostedt@goodmis•org>
To: "Masami Hiramatsu (Google)" <mhiramat@kernel•org>
Cc: Catalin Marinas <catalin.marinas@arm•com>,
Will Deacon <will@kernel•org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios•com>,
linux-kernel@vger•kernel.org, linux-trace-kernel@vger•kernel.org,
Ian Rogers <irogers@google•com>,
linux-arm-kernel@lists•infradead.org
Subject: Re: [PATCH v19 0/7] ring-buffer: Making persistent ring buffers robust
Date: Sat, 2 May 2026 15:23:04 -0400 [thread overview]
Message-ID: <20260502152304.560a5954@robin> (raw)
In-Reply-To: <177751968499.2136606.17388366710182662849.stgit@mhiramat.tok.corp.google.com>
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Hi Masami,
I applied your patches and enabled your ptracingtest code. I noticed
that when there's dropped pages, the trace output is not in order:
# trace-cmd start -B ptracingtest -e all -v -e '*lock*'
# taskset -c 5 echo c > /proc/sysrq-trigger
On reboot, I ran:
# trace-cmd show -B ptracingtest > /tmp/trace.out
Then executed the attached perl program:
# ./read-ts.pl < /tmp/trace.out
And it errors our:
30.212495 < 30.213534
<...>-1048 [005] d.... 30.212495: irq_enable: caller=irqentry_exit+0xf5/0x710 parent=0x0
That is, I think the zero timestamps may be messing with the order.
-- Steve
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next prev parent reply other threads:[~2026-05-02 19:23 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-30 3:28 [PATCH v19 0/7] ring-buffer: Making persistent ring buffers robust Masami Hiramatsu (Google)
2026-04-30 3:28 ` [PATCH v19 1/7] ring-buffer: Flush and stop persistent ring buffer on panic Masami Hiramatsu (Google)
2026-04-30 3:28 ` [PATCH v19 2/7] ring-buffer: Skip invalid sub-buffers when validating persistent ring buffer Masami Hiramatsu (Google)
2026-04-30 3:28 ` [PATCH v19 3/7] ring-buffer: Skip invalid sub-buffers when rewinding " Masami Hiramatsu (Google)
2026-04-30 3:28 ` [PATCH v19 4/7] ring-buffer: Add persistent ring buffer invalid-page inject test Masami Hiramatsu (Google)
2026-04-30 3:28 ` [PATCH v19 5/7] ring-buffer: Show commit numbers in buffer_meta file Masami Hiramatsu (Google)
2026-04-30 3:28 ` [PATCH v19 6/7] ring-buffer: Cleanup persistent ring buffer validation Masami Hiramatsu (Google)
2026-04-30 3:29 ` [PATCH v19 7/7] ring-buffer: Cleanup buffer_data_page related code Masami Hiramatsu (Google)
2026-05-02 19:23 ` Steven Rostedt [this message]
2026-05-02 22:17 ` [PATCH v19 0/7] ring-buffer: Making persistent ring buffers robust Steven Rostedt
2026-05-07 4:14 ` Masami Hiramatsu
2026-05-11 16:29 ` Steven Rostedt
2026-05-12 0:54 ` Masami Hiramatsu
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