From: Peter Zijlstra <peterz@infradead.org>
To: Will Deacon <will@kernel.org>
Cc: Yunhui Cui <cuiyunhui@bytedance.com>,
akpm@linux-foundation.org, catalin.marinas@arm.com,
maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com,
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mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
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jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com,
kan.liang@linux.intel.com, kees@kernel.org, masahiroy@kernel.org,
aliceryhl@google.com, ojeda@kernel.org,
thomas.weissschuh@linutronix.de, xur@google.com,
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linuxppc-dev@lists.ozlabs.org, linux-perf-users@vger.kernel.org
Subject: Re: [PATCH] watchdog: remove HARDLOCKUP_DETECTOR_PERF
Date: Mon, 15 Sep 2025 12:35:06 +0200 [thread overview]
Message-ID: <20250915103506.GA3245006@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <aMfpwYPX6_i6ROOY@willie-the-truck>
On Mon, Sep 15, 2025 at 11:26:09AM +0100, Will Deacon wrote:
> | If all CPUs are hard locked up at the same time the buddy system
> | can't detect it.
>
> Ok, so why is that limitation acceptable? It looks to me like you're
> removing useful functionality.
Yeah, this. I've run into this case waaay too many times to think it
reasonable to remove the perf/NMI based lockup detector.
next prev parent reply other threads:[~2025-09-15 10:35 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-15 3:53 [PATCH] watchdog: remove HARDLOCKUP_DETECTOR_PERF Yunhui Cui
2025-09-15 10:26 ` Will Deacon
2025-09-15 10:35 ` Peter Zijlstra [this message]
2025-09-15 15:42 ` Doug Anderson
2025-09-16 1:46 ` Jinchao Wang
2025-09-16 2:50 ` Ian Rogers
2025-09-16 7:42 ` Peter Zijlstra
2025-09-16 15:50 ` Doug Anderson
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