From: David Miller <davem@davemloft.net>
To: tglx@linutronix.de, mingo@redhat.com
Cc: linux-kernel@vger.kernel.org
Subject: x86's nmi_hz wrt. oprofile's nmi_timer_int.c
Date: Thu, 29 Jan 2009 15:58:52 -0800 (PST) [thread overview]
Message-ID: <20090129.155852.161923905.davem@davemloft.net> (raw)
While working on an NMI watchdog implementation on sparc64
I noticed what seems to be a peculiar behavior of the NMI
timer int oprofile support on x86.
When the NMI watchdog tests itself at boot timer we start
with nmi_hz equal to HZ.
After the NMI watchdog self-test passes, nmi_hz is reduced
down to '1'.
The NMI timer int oprofile support simply uses DIE_NMI notifiers for
it's implementation. But I don't see anything in the code of
arch/x86/oprofile/nmi_timer_int.c nor the NMI watchdog infrastructure
which will re-adjust nmi_hz back to HZ or something similar.
Am I missing something?
next reply other threads:[~2009-01-29 23:59 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-29 23:58 David Miller [this message]
2009-01-30 15:01 ` Ingo Molnar
2009-01-30 21:54 ` David Miller
2009-02-02 23:14 ` David Miller
2009-02-03 12:27 ` Ingo Molnar
2009-02-22 17:06 ` Andi Kleen
2009-02-23 4:11 ` David Miller
2009-02-23 4:52 ` Andi Kleen
2009-02-23 5:59 ` David Miller
2009-02-23 6:34 ` Andi Kleen
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