linux-kernel - Re: [PATCH V5 1/3] perf & kvm: Enhance perf to collect KVM guest os statistics from host side

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Message-ID: <20100420060640.GB22277@elte.hu>
Date:	Tue, 20 Apr 2010 08:06:40 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	Avi Kivity <avi@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Sheng Yang <sheng@...ux.intel.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	oerg Roedel <joro@...tes.org>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>, zhiteng.huang@...el.com,
	tim.c.chen@...el.com, Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH V5 1/3] perf & kvm: Enhance perf to collect KVM guest os
 statistics from host side


* Zhang, Yanmin <yanmin_zhang@...ux.intel.com> wrote:

>  unsigned long perf_misc_flags(struct pt_regs *regs)
>  {
>  	int misc = 0;
> +
>  	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
> +		if (perf_guest_cbs->is_user_mode())
> +			misc |= PERF_RECORD_MISC_GUEST_USER;
> +		else
> +			misc |= PERF_RECORD_MISC_GUEST_KERNEL;
> +	} else if (user_mode(regs))
> +		misc |= PERF_RECORD_MISC_USER;
> +	else
> +		misc |= PERF_RECORD_MISC_KERNEL;
> +

We try to use balanced curly braces. I.e.:

	if (x) {
		boo();
	} else {
		if (y)
			foo();
		else	
			bar();
	}	

And avoid unbalanced ones:

	if (x) {
		boo();
	} else
		if (y)
			foo();
		else	
			bar();

	Ingo
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