linux-kernel - Re: [PATCH] oprofile: check whether oprofile perf enabled in op_overflow

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Message-ID: <20140211180512.GO8693@mudshark.cambridge.arm.com>
Date:	Tue, 11 Feb 2014 18:05:12 +0000
From:	Will Deacon <will.deacon@....com>
To:	Weng Meiling <wengmeiling.weng@...wei.com>
Cc:	Robert Richter <rric@...nel.org>,
	"oprofile-list@...ts.sf.net" <oprofile-list@...ts.sf.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Li Zefan <lizefan@...wei.com>,
	"wangnan0@...wei.com" <wangnan0@...wei.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Huang Qiang <h.huangqiang@...wei.com>,
	"sdu.liu@...wei.com" <sdu.liu@...wei.com>
Subject: Re: [PATCH] oprofile: check whether oprofile perf enabled in
 op_overflow_handler()

On Tue, Feb 11, 2014 at 03:52:07PM +0000, Will Deacon wrote:
> On Tue, Feb 11, 2014 at 04:33:51AM +0000, Weng Meiling wrote:
> > Is there any progress on this work? Because this is important for me.
> > Sorry for trouble you.
> 
> Oops, I totally forgot about this. Does the below patch work for you?

[...]

> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index 56003c6edfd3..6fcc293d77a4 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -237,6 +237,8 @@ void perf_sample_event_took(u64 sample_len_ns)
>         u64 local_samples_len;
>         u64 allowed_ns = ACCESS_ONCE(perf_sample_allowed_ns);
>  
> +       pr_info("perf_sample_event_took(%llu ns)\n", sample_len_ns);
> +
>         if (allowed_ns == 0)
>                 return;

Ignore this hunk, it was there as a debugging aid. Testing the other half of
the patch would be useful though!

Will
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