From: Ingo Molnar <mingo@elte.hu>
To: Mandeep Singh Baines <msb@google.com>
Cc: linux-kernel@vger.kernel.org, rientjes@google.com,
mbligh@google.com, thockin@google.com, akpm@linux-foundation.org,
netdev@vger.kernel.org
Subject: Re: [PATCH] softlockup: detect bottom-half lockups
Date: Wed, 14 Jan 2009 09:06:40 +0100 [thread overview]
Message-ID: <20090114080640.GA19116@elte.hu> (raw)
In-Reply-To: <20090114070447.GA25222@google.com>
* Mandeep Singh Baines <msb@google.com> wrote:
> The feature should be useful to real-time developers and developers of
> network and other high-performance drivers.
hm, did you know about the ftrace latency tracers:
config IRQSOFF_TRACER
bool "Interrupts-off Latency Tracer"
config PREEMPT_TRACER
bool "Preemption-off Latency Tracer"
config SCHED_TRACER
bool "Scheduling Latency Tracer"
PREEMPT_TRACER would have shown you that softirqs-off section very nicely.
(And if you also enable the function tracer then not just the latency
endpoint is shown, but also all the function calls that happened in the
critical section.)
Ingo
next prev parent reply other threads:[~2009-01-14 8:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-14 7:04 [PATCH] softlockup: detect bottom-half lockups Mandeep Singh Baines
2009-01-14 8:06 ` Ingo Molnar [this message]
2009-01-15 14:04 ` Mandeep Singh Baines
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