From: Andi Kleen <ak@suse.de>
To: discuss@x86-64.org
Subject: Re: [discuss] Re: 2.6.19-rc5: known regressions (v3)
Date: Wed, 15 Nov 2006 17:48:05 +0100
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Cc: William Cohen <wcohen@redhat.com>, Eric Dumazet <dada1@cosmosbay.com>,
       Andrew Morton <akpm@osdl.org>, Komuro <komurojun-mbn@nifty.com>,
       Ernst Herzberg <earny@net4u.de>, Andre Noll <maan@systemlinux.org>,
       oprofile-list@lists.sourceforge.net, Jens Axboe <jens.axboe@oracle.com>,
       linux-usb-devel@lists.sourceforge.net, phil.el@wanadoo.fr,
       Adrian Bunk <bunk@stusta.de>, Ingo Molnar <mingo@redhat.com>,
       Alan Stern <stern@rowland.harvard.edu>,
       linux-pci@atrey.karlin.mff.cuni.cz,
       Stephen Hemminger <shemminger@osdl.org>,
       Prakash Punnoor <prakash@punnoor.de>, Len Brown <len.brown@intel.com>,
       Alex Romosan <romosan@sycorax.lbl.gov>,
       Linus Torvalds <torvalds@osdl.org>, gregkh@suse.de,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       "Eric W. Biederman" <ebiederm@xmission.com>,
       Andrey Borzenkov <arvidjaar@mail.ru>
References: <Pine.LNX.4.64.0611071829340.3667@g5.osdl.org> <200611151150.11275.ak@suse.de> <455B4314.3010503@redhat.com>
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> OProfile has a simplistic view of the performance monitoring hardware. The 
> routines in libop/op_alloc_counter.c determine what set of performance registers 
> is available from the processor in use. There is no check to see what registers 
> are actually available in the /dev/oprofile directory.
> 
> opcontrol executes ophelp to determine which specific counters to count which 
> events. The function map_event_to_counter() in libop/op_alloc_counter.c does the 
> actual selection. It seems what is needed is for map_event_to_counter() to check 
> to see which counters are available and mark the others as unavailable

Thanks for the explanation. Can you please fix it and release a new version? 
Documentation/Changes could be adapted then.

-Andi

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