linux-kernel - Re: [regression, 3.15-rc1] vdso

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Message-ID: <20140415081158.GK15995@dastard>
Date:	Tue, 15 Apr 2014 18:11:59 +1000
From:	Dave Chinner <david@...morbit.com>
To:	linux-kernel@...r.kernel.org
Cc:	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [regression, 3.15-rc1] vdso_gettimeofday hogs all my CPU

On Tue, Apr 15, 2014 at 05:53:36PM +1000, Dave Chinner wrote:
> Hi Peter,
> 
> I'm guessing that x86 vdso problems are in your area of expertise,
> if not can you point me at the right person to bug?

And you can ignore it. The VM wasn't running the kernel I thought it
was - it was an old kernel from half way through last week. A
3.15-rc1 kernel, which I'm now testing, doesn't show the regression:

FSUse%        Count         Size    Files/sec     App Overhead
     0      1600000            0     281779.0          9964735
     0      3200000            0     280343.0         10174512
     0      4800000            0     268615.2         11330160
     0      6400000            0     264782.4         11072193
.....

It shows all sorts of interesting new inode cache reclaim imbalances,
but other than that the peak performance is back to normal...

Sorry for the noise.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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