From: Peter Zijlstra <peterz@infradead.org>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>, Andi Kleen <ak@linux.intel.com>,
lkml <linux-kernel@vger.kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>
Subject: Re: [RFC,PATCH] VMWARE faults on accessing disabled counters
Date: Wed, 31 Aug 2016 15:41:03 +0200 [thread overview]
Message-ID: <20160831134103.GE10153@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20160831131924.GA2801@krava>
On Wed, Aug 31, 2016 at 03:19:24PM +0200, Jiri Olsa wrote:
>
> I guess if real HW does not fault on this we dont need to bother,
> and treat it as the VMWARE issue.. but I couldn't find this info
>
So I've once had a machine that backlisted one entry, but I've forgotten
what machine that was. But IIRC, you could program the thing just fine,
the results were crap though, which is why CPUID blacklisted the
counter.
/me pokes around some code...
Ah, see the AAJ80 code. That was some Nehalem part and the comment very
much implies programming the value 'works', you just get crap results.
prev parent reply other threads:[~2016-08-31 13:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-31 12:03 [RFC,PATCH] VMWARE faults on accessing disabled counters Jiri Olsa
2016-08-31 13:11 ` Peter Zijlstra
2016-08-31 13:19 ` Jiri Olsa
2016-08-31 13:41 ` Peter Zijlstra [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160831134103.GE10153@twins.programming.kicks-ass.net \
--to=peterz@infradead.org \
--cc=ak@linux.intel.com \
--cc=alexander.shishkin@linux.intel.com \
--cc=jolsa@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox