linux-kernel - Re: [PATCH v2] tracing/function-graph-tracer: prevent from hrtimer interrupt infinite loop

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <c62985530812220246m3801c3f0k8db435f8c9af04e0@mail.gmail.com>
Date:	Mon, 22 Dec 2008 11:46:47 +0100
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Thomas Gleixner" <tglx@...utronix.de>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] tracing/function-graph-tracer: prevent from hrtimer interrupt infinite loop

2008/12/21 Frédéric Weisbecker <fweisbec@...il.com>:
> 2008/12/21 Ingo Molnar <mingo@...e.hu>:
>>
>> * Ingo Molnar <mingo@...e.hu> wrote:
>>
>>> btw., a graph-tracer buglet i noticed:
>>
>> another thing. I turned off all the options that come ahead of the 'meat'
>> of the trace data:
>>
>> # cat /debug/tracing/trace_options
>> print-parent nosym-offset nosym-addr noverbose noraw nohex nobin noblock
>> nostacktrace nosched-tree ftrace_printk noftrace_preempt nobranch annotate
>> nouserstacktrace nosym-userobj printk-msg-only nofuncgraph-overrun
>> nofuncgraph-cpu nofuncgraph-overhead nofuncgraph-proc
>>
>> but i still got the 'duration' field printed:
>>
>> # tracer: function_graph
>> #
>> # DURATION            FUNCTION CALLS
>> #     |               |   |   |   |
>>
>> 0.865 us    |    }
>>            |    alloc_page_vma() {
>> 0.295 us    |      get_vma_policy();
>> 0.268 us    |      policy_zonelist();
>>            |      __alloc_pages_internal() {
>> 0.257 us    |        __might_sleep();
>>            |        get_page_from_freelist() {
>>
>>
>> i'd have expected to only see the flow of execution as it happens.
>>
>>        Ingo
>>
>
>
> Strange. I will test that.
>

Did I say it was strange? No it isn't, there is no option to turn off
the duration :-)
I will add one.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/