From: Peter Oberparleiter <oberpar@linux.ibm.com>
To: Heiko Carstens <hca@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Harald Freudenberger <freude@linux.ibm.com>,
Holger Dengler <dengler@linux.ibm.com>,
Vineeth Vijayan <vneethv@linux.ibm.com>,
Janosch Frank <frankja@linux.ibm.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>,
David Hildenbrand <david@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/4] s390/cio: Remove cond_resched() calls
Date: Tue, 28 Jul 2026 11:28:48 +0200 [thread overview]
Message-ID: <d6001f44-0fef-4181-8924-45541ce53d97@linux.ibm.com> (raw)
In-Reply-To: <20260727162430.1599396-5-hca@linux.ibm.com>
On 27.07.2026 18:24, Heiko Carstens wrote:
> Since [1] cond_resched() is a no-op on s390. Remove all calls.
>
> [1] commit 7dadeaa6e851 ("sched: Further restrict the preemption modes")
>
> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Makes sense, also given that this use of cond_resched() was added
specifically for the non-preempt case:
To quote b207f5a8f9a6 ("s390/cio: Relax subchannel scan loop"):
...
This processing can take a significant amount of time during which
no other task can run on the same CPU (unless CONFIG_PREEMPT has
been enabled).
...
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
--
Peter Oberparleiter
Linux on IBM Z Development - IBM Germany R&D
prev parent reply other threads:[~2026-07-28 9:29 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-27 16:24 [PATCH 0/4] s390: Remove or replace cond_resched() calls Heiko Carstens
2026-07-27 16:24 ` [PATCH 1/4] s390/crypto: Replace cond_resched() with schedule() Heiko Carstens
2026-07-27 17:05 ` sashiko-bot
2026-07-28 7:05 ` Harald Freudenberger
2026-07-28 8:29 ` Heiko Carstens
2026-07-28 8:53 ` Harald Freudenberger
2026-07-28 9:51 ` Holger Dengler
2026-07-28 12:06 ` Heiko Carstens
2026-07-28 10:43 ` Peter Zijlstra
2026-07-27 16:24 ` [PATCH 2/4] KVM: s390: Remove cond_resched() calls Heiko Carstens
2026-07-27 16:57 ` sashiko-bot
2026-07-27 16:24 ` [PATCH 3/4] " Heiko Carstens
2026-07-27 16:54 ` sashiko-bot
2026-07-27 16:24 ` [PATCH 4/4] s390/cio: " Heiko Carstens
2026-07-27 16:54 ` sashiko-bot
2026-07-28 9:28 ` Peter Oberparleiter [this message]
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