linux-kernel - Re: [PATCH 0/2] fix "perf top" soft lockups under Xen

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Date:	Thu, 19 Apr 2012 15:00:59 +0800
From:	Lin Ming <mlin@...pku.edu.cn>
To:	Steven Noonan <steven@...inklabs.net>
Cc:	linux-kernel@...r.kernel.org,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Marcus Granado <marcus.granado@...rix.com>,
	xen-devel@...ts.xen.org, Ben Guthro <ben@...hro.net>
Subject: Re: [PATCH 0/2] fix "perf top" soft lockups under Xen

On Thu, Apr 19, 2012 at 2:47 PM, Steven Noonan <steven@...inklabs.net> wrote:

[snip]

>
> OK, finally got around to testing this. Sorry about the delay, been
> rather busy at work.
>
> These two patches definitely fix the lockups, but 'perf test' doesn't
> pass every test:

Thanks for the test!

>
>         1: vmlinux symtab matches kallsyms:
>        --- start ---
>        Looking at the vmlinux_path (6 entries long)
>        dso__load_sym: cannot get elf header.
>        Using /lib/modules/3.3.2-00002-gf57130d/build/vmlinux for symbols
>        Maps only in vmlinux:
>         ffffffff81ae61b1-ffffffff81b9d7b7 0 [kernel].init.text
>         ffffffff81b9d7b8-ffffffff9fffffff 0 [kernel].exit.text
>        Maps in vmlinux with a different name in kallsyms:
>        Maps only in kallsyms:
>        ---- end ----
>        vmlinux symtab matches kallsyms: Ok
>         2: detect open syscall event:
>        --- start ---
>        ---- end ----
>        detect open syscall event: Ok
>         3: detect open syscall event on all cpus:
>        --- start ---
>        ---- end ----
>        detect open syscall event on all cpus: Ok
>         4: read samples using the mmap interface:
>        --- start ---
>        ---- end ----
>        read samples using the mmap interface: Ok
>         5: parse events tests:
>        --- start ---
>        ---- end ----
>        parse events tests: Ok
>         6: Validate PERF_RECORD_* events & perf_sample fields:
>        --- start ---
>        perf_evlist__open: Bad file descriptor
>        ---- end ----
>        Validate PERF_RECORD_* events & perf_sample fields: FAILED!

This should be another unrelated issue.
Let me try to see if I can reproduce it.

>
> I couldn't figure out what exactly was failing in that test with a
> quick inspection... Someone else want to take a stab at it? If someone
> wants to give me patches that add extra output, I could run those too.
>
> Anyway:
>
> Tested-by: Steven Noonan <steven@...inklabs.net>

Thanks.

Lin Ming

>
> - Steven
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