From: Shrikanth Hegde <sshegde@linux.ibm.com>
To: Thomas Gleixner <tglx@kernel.org>, LKML <linux-kernel@vger.kernel.org>
Cc: Ihor Solodrai <ihor.solodrai@linux.dev>,
Peter Zijlstra <peterz@infradead.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Michael Jeanson <mjeanson@efficios.com>
Subject: Re: [patch 2/4] sched/mmcid: Protect transition on weakly ordered systems
Date: Sat, 31 Jan 2026 00:20:12 +0530 [thread overview]
Message-ID: <b2c4ae33-ee1c-4660-809e-27983cf4232b@linux.ibm.com> (raw)
In-Reply-To: <20260129211557.746946556@kernel.org>
Hi Thomas.
On 1/30/26 2:50 AM, Thomas Gleixner wrote:
> Shrikanth reported a hard lockup which he observed once. The stack trace
> shows the following CID related participants:
>
I lost the system where this was seen once.
But I gave the series a try on another power(NV) system.
Ran schbench (which seems to execute some cid stuff) and hackbench
and didn't see any splat in limited testing.
next prev parent reply other threads:[~2026-01-30 18:50 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-29 21:20 [patch 0/4] sched/mmcid: Cure mode transition woes Thomas Gleixner
2026-01-29 21:20 ` [patch 1/4] sched/mmcid: Prevent live lock on task to CPU mode transition Thomas Gleixner
2026-01-30 15:24 ` Mathieu Desnoyers
2026-01-30 16:17 ` Thomas Gleixner
2026-01-29 21:20 ` [patch 2/4] sched/mmcid: Protect transition on weakly ordered systems Thomas Gleixner
2026-01-30 15:36 ` Mathieu Desnoyers
2026-01-30 16:16 ` Thomas Gleixner
2026-01-30 15:43 ` Mathieu Desnoyers
2026-01-30 18:50 ` Shrikanth Hegde [this message]
2026-01-30 18:58 ` Mathieu Desnoyers
2026-01-31 6:10 ` Shrikanth Hegde
2026-01-29 21:20 ` [patch 3/4] sched/mmcid: Drop per CPU CID immediately when switching to per task mode Thomas Gleixner
2026-01-30 15:38 ` Mathieu Desnoyers
2026-01-29 21:20 ` [patch 4/4] sched/mmcid: Optimize transitional CIDs when scheduling out Thomas Gleixner
2026-01-30 15:50 ` Mathieu Desnoyers
2026-01-30 16:13 ` Thomas Gleixner
2026-01-30 16:29 ` Mathieu Desnoyers
2026-01-30 0:20 ` [patch 0/4] sched/mmcid: Cure mode transition woes Ihor Solodrai
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