linux-kernel - Re: [PATCH] arm: armv7: perf: fix armv7 ref-cycles error

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Message-ID: <20141008091741.GC26140@arm.com>
Date:	Wed, 8 Oct 2014 10:17:41 +0100
From:	Will Deacon <will.deacon@....com>
To:	zhangzhiqiang <zhangzhiqiang.zhang@...wei.com>
Cc:	Mark Rutland <Mark.Rutland@....com>,
	"cov@...eaurora.org" <cov@...eaurora.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"lizefan@...wei.com" <lizefan@...wei.com>,
	"wangnan0@...wei.com" <wangnan0@...wei.com>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm: armv7: perf: fix armv7 ref-cycles error

On Wed, Oct 08, 2014 at 04:06:12AM +0100, zhangzhiqiang wrote:
> hi all,
> ----------------------------------------
> 
> ref-cycles event is specially to Intel core, but can still used in arm architecture
> with the wrong return value with 3.10 stable. for instance:
> 
>  perf stat -e ref-cycles sleep 1
> 
>  Performance counter stats for 'sleep 1':
> 
>   	0 ref-cycles
> 
>        1.002381916 seconds time elapsed
> 
> this patch fix the bug and make it return NOT SUPPORTED
> distinctly.
> 
> In upstream this bug has been fixed by other way(not primary for the bug), which changes more than one file
> and more than 1000 lines. the primary commit is 6b7658ec8a100b608e59e3cde353434db51f5be0.
> besides we can not simply cherry-pick.

I thought I saw Greg pick this up the other day?

Will
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