From: Peter Zijlstra <peterz@infradead.org>
To: "Herton R. Krzesinski" <herton@redhat.com>
Cc: linux-kernel@vger.kernel.org, frederic@kernel.org,
mingo@kernel.org, paulmck@linux.vnet.ibm.com, tglx@linutronix.de,
anna-maria@linutronix.de, kyin@redhat.com, jaeshin@redhat.com
Subject: Re: [RFC] Processing of raised_list can stall if an IPI/interrupt is missed
Date: Tue, 3 Mar 2026 20:29:53 +0100 [thread overview]
Message-ID: <20260303192953.GM1395266@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <20260303190715.935867-1-herton@redhat.com>
On Tue, Mar 03, 2026 at 04:07:15PM -0300, Herton R. Krzesinski wrote:
> Or may be it's not worth changing this since this is rare and missed self IPI should
> not be expected?
IPIs going missing is certainly unexpected; although kernel/smp.c has
much debugging crud for similar scenarios (AFAIK all of them related to
virt).
If IPIs go missing your system *will* go funny in one way or another.
I'm not totally against building in some fallback, but we should
definitely consider it dodgy/buggy if we do detect one has gone
walk-about.
next prev parent reply other threads:[~2026-03-03 19:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-03 19:07 Herton R. Krzesinski
2026-03-03 19:29 ` Peter Zijlstra [this message]
2026-03-03 22:39 ` Thomas Gleixner
2026-03-04 13:12 ` Herton Krzesinski
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