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From: David Ahern <david.ahern@oracle.com>
To: David Miller <davem@davemloft.net>
Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org
Subject: Re: maps mismatch in /proc/kcore for sparc
Date: Wed, 18 Mar 2015 19:57:59 +0000	[thread overview]
Message-ID: <5509D8C7.5080504@oracle.com> (raw)
In-Reply-To: <20150318.154359.1325469409095627387.davem@davemloft.net>

On 3/18/15 1:43 PM, David Miller wrote:
> From: David Ahern <david.ahern@oracle.com>
> Date: Wed, 18 Mar 2015 10:56:22 -0600
>
>> I am trying to understand why the perf tool on sparc fails to convert
>> kernel symbols when /proc/kcore is used. I have instrumented perf to
>> the point I can see that it drops symbols from kallsyms because it
>> cannot find a corresponding map when the kernel maps are created based
>> on parsing /proc/kcore.
>
> I'm looking into this, I think we need to set ARCH_PROC_KCORE_TEXT in
> arch/sparc/Kconfig

Missed that config in my fumbling through the kcore code. Adding it to 
sparc/Kconfig and it works. map is added:

kcore_mapfn: dso [kernel.kallsyms]: new map from 404000 to e33d79

and kernel symbols are not dropped. One mystery solved.

Thanks,
David

WARNING: multiple messages have this Message-ID (diff)
From: David Ahern <david.ahern@oracle.com>
To: David Miller <davem@davemloft.net>
Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org
Subject: Re: maps mismatch in /proc/kcore for sparc
Date: Wed, 18 Mar 2015 13:57:59 -0600	[thread overview]
Message-ID: <5509D8C7.5080504@oracle.com> (raw)
In-Reply-To: <20150318.154359.1325469409095627387.davem@davemloft.net>

On 3/18/15 1:43 PM, David Miller wrote:
> From: David Ahern <david.ahern@oracle.com>
> Date: Wed, 18 Mar 2015 10:56:22 -0600
>
>> I am trying to understand why the perf tool on sparc fails to convert
>> kernel symbols when /proc/kcore is used. I have instrumented perf to
>> the point I can see that it drops symbols from kallsyms because it
>> cannot find a corresponding map when the kernel maps are created based
>> on parsing /proc/kcore.
>
> I'm looking into this, I think we need to set ARCH_PROC_KCORE_TEXT in
> arch/sparc/Kconfig

Missed that config in my fumbling through the kcore code. Adding it to 
sparc/Kconfig and it works. map is added:

kcore_mapfn: dso [kernel.kallsyms]: new map from 404000 to e33d79

and kernel symbols are not dropped. One mystery solved.

Thanks,
David

  reply	other threads:[~2015-03-18 19:57 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-18 16:56 maps mismatch in /proc/kcore for sparc David Ahern
2015-03-18 16:56 ` David Ahern
2015-03-18 19:43 ` David Miller
2015-03-18 19:43   ` David Miller
2015-03-18 19:57   ` David Ahern [this message]
2015-03-18 19:57     ` David Ahern
2015-03-18 20:14     ` David Miller
2015-03-18 20:14       ` David Miller
2015-03-18 21:22       ` David Ahern
2015-03-18 21:22         ` David Ahern

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