linux-kernel - Re: [LKP] [lkp] [xfs] 68a9f5e700: aim7.jobs-per-min -13.6% regression

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Date:	Fri, 12 Aug 2016 11:26:01 +1000
From:	Dave Chinner <david@...morbit.com>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Bob Peterson <rpeterso@...hat.com>,
	Wu Fengguang <fengguang.wu@...el.com>, LKP <lkp@...org>,
	Christoph Hellwig <hch@....de>
Subject: Re: [LKP] [lkp] [xfs] 68a9f5e700: aim7.jobs-per-min -13.6% regression

On Thu, Aug 11, 2016 at 11:16:12AM +1000, Dave Chinner wrote:
> On Wed, Aug 10, 2016 at 05:33:20PM -0700, Huang, Ying wrote:
> We need to know what is happening that is different - there's a good
> chance the mapping trace events will tell us. Huang, can you get
> a raw event trace from the test?
> 
> I need to see these events:
> 
> 	xfs_file*
> 	xfs_iomap*
> 	xfs_get_block*
> 

lkp-folks, can I please get these traces run and sent to me? I don't
have the time or patience to try to get aim7 running on my machines
- the build is full of hard-coded paths and libraries that aren't
provided by modern distros (e.g. it requires a static libaio.a!) and
it fails at the configure stage complaining that:

configure: error: C compiler cannot create executables

Which is a complete load of BS.

Hence I can't make progress until I have some way of understanding
what the IO pattern is that is generating the profile being
measured. So far I'm unable to do that with any of the tools I been
trying, hence I need the traces to work out what I'm missing...

Cheers,

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