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adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2312050161 X-Proofpoint-ORIG-GUID: WcVFVNnn3mljgDBOniekBcUbkSrR7JGX X-Proofpoint-GUID: WcVFVNnn3mljgDBOniekBcUbkSrR7JGX X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lipwig.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (lipwig.vger.email [0.0.0.0]); Tue, 05 Dec 2023 12:21:07 -0800 (PST) Paul E. McKenney writes: > On Tue, Dec 05, 2023 at 10:01:14AM -0500, Steven Rostedt wrote: >> On Mon, 4 Dec 2023 17:01:21 -0800 >> "Paul E. McKenney" wrote: >> >> > On Tue, Nov 28, 2023 at 11:53:19AM +0100, Thomas Gleixner wrote: >> > > Paul! >> > > >> > > On Tue, Nov 21 2023 at 07:19, Paul E. McKenney wrote: >> > > > On Tue, Nov 21, 2023 at 10:00:59AM -0500, Steven Rostedt wrote: ... >> > > 3) Looking at the initial problem Ankur was trying to solve there is >> > > absolutely no acceptable solution to solve that unless you think >> > > that the semantically invers 'allow_preempt()/disallow_preempt()' >> > > is anywhere near acceptable. >> > >> > I am not arguing for allow_preempt()/disallow_preempt(), so for that >> > argument, you need to find someone else to argue with. ;-) >> >> Anyway, there's still a long path before cond_resched() can be removed. It >> was a mistake by Ankur to add those removals this early (and he has >> acknowledged that mistake). > > OK, that I can live with. But that seems to be a bit different of a > take than that of some earlier emails in this thread. ;-) Heh I think it's just that this thread goes to (far) too many places :). As Steven says, the initial series touching everything all together was a mistake. V1 adds the new preemption model alongside the existing ones locally defines cond_resched() as nop. That'll allow us to experiment and figure out where there are latency gaps. Ankur