linux-kernel - Re: [PATCH 1/4] perf bench: Add new subsystem and new suite, bench/mem-memcpy.c

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Message-ID: <20091117112148.GA32578@elte.hu>
Date:	Tue, 17 Nov 2009 12:21:48 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	paulus@...ba.org, fweisbec@...il.com, ling.ma@...el.com
Subject: Re: [PATCH 1/4] perf bench: Add new subsystem and new suite,
 bench/mem-memcpy.c


* Hitoshi Mitake <mitake@....info.waseda.ac.jp> wrote:

> From: Ingo Molnar <mingo@...e.hu>
> Subject: Re: [PATCH 1/4] perf bench: Add new subsystem and new suite, bench/mem-memcpy.c
> Date: Fri, 13 Nov 2009 10:46:50 +0100
> 
> I've fixed mem-memcpy.c according to your comment,
> but I also have some comments.
> 
> > 
> > > +};
> > > +
> > > +struct routine routines[] = {
> > > +	{ "default",
> > > +	  memcpy,
> > > +	  "Default memcpy() provided by glibc" },
> > > +	{ NULL,
> > > +	  NULL,
> > > +	  NULL }
> > 
> > { NULL, } would be equivalent i guess.
> 
> Initializing the termination with { NULL, } causes build error.
> So I can't change this point.

ah, ok.

> 
> > > +		break;
> > > +	case BENCH_FORMAT_SIMPLE:
> > > +		if (use_clockcycle)
> > > +			printf("%lf\n",
> > > +			       (double)clock_diff / (double)length);
> > > +		else
> > > +			printf("%lf\n", bps);
> > > +		break;
> > > +	default:
> > > +		/* reaching here is something disaster */
> > > +		fprintf(stderr, "Unknown format:%d\n", bench_format);
> > 
> > could use pr_err() here i guess.
> 
> It seems that pr_err() is a wrapper for printk(),
> so I can't use pr_err() in perf.

ok.

	Ingo
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