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Wed, 5 Aug 2026 09:52:07 +0000 (GMT) Message-ID: <8a2ef402-0164-43be-8c33-49e9d3529d86@linux.ibm.com> Date: Wed, 5 Aug 2026 11:52:06 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/6] sched: dynamic: Simplify PREEMPT_DYNAMIC To: Mark Rutland , linux-kernel@vger.kernel.org Cc: frederic@kernel.org, jstultz@google.com, juri.lelli@redhat.com, mingo@redhat.com, peterz@infradead.org, ruanjinjie@huawei.com, sshegde@linux.ibm.com, tglx@linutronix.de, vincent.guittot@linaro.org, vschneid@redhat.com References: <20260803191731.3244294-1-mark.rutland@arm.com> Content-Language: en-US From: Mete Durlu In-Reply-To: <20260803191731.3244294-1-mark.rutland@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODA1MDA3NyBTYWx0ZWRfX7uWRtRH/Mh2P jO/lrbVv5OvE8L0ufiuAf8e8OZkAhVBhUj2auNjpbZ7SiNDWuWG39/ja8l/T+1+LPpaQytVn7ib qPaY29NN9WIJLwEK8PDsHLEuveaqJYV9RHgGXkktd/+9pu0xFL5P6LKbSn5cprAtyr25inMMK4W 2ZU5oSxcTo+q63U3xqgXjheQxPPJTu4PevN0MtcwLwHw4afQfpLvKlCR+b0KuXAOkfD99TYBMQo sCfgr1edH86U2PglfqL3qW7h42pwO6qTFbMlCWjGi9n18H4Hgb0u9JYCjegrpmAhoD0Nnamt63f 3DEkjUl46kjKjqaZ79bKGiexpPLOPnH+uSncU4ONHjryRXgDf0MXGCzgmG35UBsdsTHfw5eP9zz 9FUlJ5jNrzWWYMpuO2074aCizChTq7P3MK3Cwa356C0IGpW0K4Q5TnmDg6gddEq+ejVFJUps3MZ aoJL5h6u0UZY3D6YhVw== X-Authority-Analysis: v=2.4 cv=WIFPmHsR c=1 sm=1 tr=0 ts=6a7307ca cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=3EESxhbNqq0XvyrhUgwA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: xgynCswJheaDPhv1QWycf0VeZLAtl0x1 X-Proofpoint-ORIG-GUID: YrINTiJNsuMRsvKQvoAObPnvXvlDevXc X-Proofpoint-Spam-Info: AW1haW4tMjYwODA1MDA3NyBTYWx0ZWRfX7tR4PjTqvFkD ZdSLUwoIBKL5Ipoqum3J83m0YxCEFwrT9FdCPcC0vtCzlM9W3W5+6dIxtRdMdU5J8J16TYe2sBa Vpw87xS1SRoNuuR3imR60G0YroVbH/U= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-05_03,2026-08-04_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 malwarescore=0 suspectscore=0 clxscore=1011 impostorscore=0 bulkscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608050077 On 03/08/2026 21:17, Mark Rutland wrote: > All architectures which currently suppoort PREEMPT_DYNAMIC select > ARCH_HAS_PREEMPT_LAZY. On architectures which select > ARCH_HAS_PREEMPT_LAZY, it has not been possible to select the NONE and > VOLUNTARY preemption models since v7.0 due to commit: > > 7dadeaa6e851 ("sched: Further restrict the preemption modes") > > Hence in practice PREEMPT_DYNAMIC no longer supports the NONE or > VOLUNTARY preemption models. > > This series makes the de-facto situation official by making > PREEMPT_DYNAMIC depend on ARCH_HAS_PREEMPT_LAZY, and removing redundant > code. > > Since v1, I've had to rebase atop v7.2-rc4 to avoid a conflict with > commit: > > a2c02aa0c6ca ("powerpc: Remove dead non-preemption code") > > Given this is now late in the cycle, and given the tip:sched/core branch > is based on v7.2-rc1, I suspect tip folk might not want to queue this > now. Please let me know what you'd prefer; I'm happy to rebase and > resend after v7.3-rc1. > > Since v1: > * Rebase to v7.2-rc4 > * Apply Revied-by tags. > * Fix typos in commit messages. > * Add patch to cleanup accessors (per Shrikanth's comment) > > Mark. > Hi, I once again did a build test and the results are looking the same; $ ls -la baseline/vmlinux patched/vmlinux -rwxrwxr-x 1 meted meted 409534568 Aug 5 11:38 baseline/vmlinux -rwxrwxr-x 1 meted meted 408212872 Aug 5 10:50 patched/vmlinux $ ls -la baseline/bzImage patched/bzImage -rwxrwxr-x 1 meted meted 12922880 Aug 5 11:38 baseline/bzImage -rwxrwxr-x 1 meted meted 12890112 Aug 5 10:51 patched/bzImage Both bzImage and vmlinux are shrunk after the patch for s390. bzImage ~32K smaller vmlinux ~1.2M smaller FWIW, here is my tested-by; Tested-by: Mete Durlu