linux-kernel - Re: [PATCH 14/16] perf kvm: reuse some code of perf_kvm__timerfd

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Message-ID: <20130912134058.GF23826@gmail.com>
Date:	Thu, 12 Sep 2013 15:40:58 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org, acme@...stprotocols.net,
	fweisbec@...il.com, peterz@...radead.org, jolsa@...hat.com,
	namhyung@...nel.org, xiaoguangrong@...ux.vnet.ibm.com,
	runzhen@...ux.vnet.ibm.com, Runzhen Wang <icycoder@...il.com>
Subject: Re: [PATCH 14/16] perf kvm: reuse some code of
 perf_kvm__timerfd_create()


* David Ahern <dsahern@...il.com> wrote:

> On 9/12/13 6:08 AM, Ingo Molnar wrote:
> >
> >btw., I tried to build perf on a really old distro that has no timerfd.h,
> >and got:
> 
> Right. I hit that last week or so with RHEL5 as a build server.
> 
> timerfd was introduced before perf so any system with perf capability 
> will also have timerfd. So the problem is strictly building perf on an 
> older system. [...]

I'm booting new kernels on an old system and I'm building it there.

So it's new kernel, new perf source and binary, old userspace.

Thanks,

	Ingo
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