Re: [PATCH 14/16] perf kvm: reuse some code of perf_kvm__timerfd_create()

From: David Ahern
Date: Tue Oct 29 2013 - 09:53:58 EST

On 10/29/13 7:23 AM, Ingo Molnar wrote:

* Ingo Molnar <mingo@xxxxxxxxxx> wrote:

* David Ahern <dsahern@xxxxxxxxx> 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.

Btw., this build failure is still there today:

Right, I put together a patch on Sept 14th and got distracted. I'll rebase to top of tree, update per the new feature tests and send it out today.


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