From: Thomas Gleixner <tglx@kernel.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
LKML <linux-kernel@vger.kernel.org>
Cc: Ihor Solodrai <ihor.solodrai@linux.dev>,
Shrikanth Hegde <sshegde@linux.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
Michael Jeanson <mjeanson@efficios.com>
Subject: Re: [patch 1/4] sched/mmcid: Prevent live lock on task to CPU mode transition
Date: Fri, 30 Jan 2026 17:17:09 +0100 [thread overview]
Message-ID: <87wm0zjcsa.ffs@tglx> (raw)
In-Reply-To: <154690d7-9e9f-4d36-a89c-7ed1a57c42ae@efficios.com>
On Fri, Jan 30 2026 at 10:24, Mathieu Desnoyers wrote:
> On 2026-01-29 16:20, Thomas Gleixner wrote:
>> if (percpu) {
>> mm_cid_fixup_tasks_to_cpus();
>> + /* Clear the transition bit */
>> + WRITE_ONCE(mm->mm_cid.transit, 0);
>
> You should move this WRITE_ONCE at the end of
> mm_cid_fixup_tasks_to_cpus() to keep the same pattern as for
> mm_cid_fixup_cpus_to_tasks().
I fixed that up in the wrong patch. Will fold it back into that one.
next prev parent reply other threads:[~2026-01-30 16:17 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 [this message]
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
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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