From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm: armv7: perf: fix armv7 ref-cycles error
Date: Wed, 8 Oct 2014 10:17:41 +0100 [thread overview]
Message-ID: <20141008091741.GC26140@arm.com> (raw)
In-Reply-To: <5434AA24.7010600@huawei.com>
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
next prev parent reply other threads:[~2014-10-08 9:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-08 3:06 [PATCH] arm: armv7: perf: fix armv7 ref-cycles error zhangzhiqiang
2014-10-08 9:17 ` Will Deacon [this message]
2014-10-08 13:31 ` gregkh at linuxfoundation.org
2014-10-08 13:38 ` Will Deacon
2014-10-09 3:07 ` zhangzhiqiang
2014-10-09 3:41 ` gregkh at linuxfoundation.org
2014-10-09 7:13 ` zhangzhiqiang
2014-10-09 13:51 ` gregkh at linuxfoundation.org
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