From: Anton Blanchard <anton@samba.org>
To: Zwane Mwaikambo <zwane@linuxpower.ca>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
John Levon <levon@movementarian.org>,
Philippe Elie <phil.el@wanadoo.fr>
Subject: Re: [PATCH][1/3] Completely out of line spinlocks / generic
Date: Wed, 1 Sep 2004 11:26:13 +1000 [thread overview]
Message-ID: <20040901012613.GL26072@krispykreme> (raw)
In-Reply-To: <Pine.LNX.4.58.0408300057130.24992@montezuma.fsmlabs.com>
> Looking at the PPC oprofile code, how does contention get reported?
> get_pc() looks like it may be returning _raw_spin_*
Yep unfortunately we end up with ticks in the out of line spinlock
functions. We could recognise this in the profile code and walk up the
stack, I think sparc64 has been doing that.
I have a similar problem with hardware performance counters but its much
more difficult there. Since we dont have an NMI you get the profile tick
when interrupts are reenabled. At that point we may be out of the spin
lock so backtracing is impossible.
Anton
prev parent reply other threads:[~2004-09-01 1:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-30 4:43 [PATCH][1/3] Completely out of line spinlocks / generic Zwane Mwaikambo
2004-08-30 5:02 ` Zwane Mwaikambo
2004-09-01 1:26 ` Anton Blanchard [this message]
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