linux-kernel - Re: [PATCH] x86, perf, nmi: Disable perf if counters are not accessable

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Date:	Tue, 23 Nov 2010 16:15:05 +0100
From:	Sedat Dilek <sedat.dilek@...glemail.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, dzickus@...hat.com
Subject: Re: [PATCH] x86, perf, nmi: Disable perf if counters are not accessable

Hi,

I am seeing for a while this warning in my system-wide logs:

Nov 23 11:54:14 tbox kernel: [    0.040335] NMI watchdog failed to
create perf event on cpu0: ffffffa1

As I saw this patch from [1], I was hoping it's also fixing my problem
on an Intel Pentium-M (Banias) Single-Core CPU:

"So I changed it to:

static bool check_hw_exists(void)
{
        u64 val, val_new = 0;
        int ret = 0;
        val = 0xabcdUL;
        ret |= checking_wrmsrl(x86_pmu.perfctr, val);
        ret |= rdmsrl_safe(x86_pmu.perfctr, &val_new);
        if (ret || val != val_new)
                return false;
        return true;
}
And have applied the patch,

Thanks Don!"

Where did you apply it? Shouldn't that be in linux-2.6-tip perf/* GIT tree?

Regards,
- Sedat -

[1] http://lkml.org/lkml/2010/11/23/121
[2] http://git.kernel.org/?p=linux/kernel/git/tip/linux-2.6-tip.git;a=summary
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