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Shenoy" , Richard Henderson , Ivan Kokshaysky , Matt Turner , Guo Ren , Michal Simek , Dinh Nguyen , Jonas Bonn , Stefan Kristiansson , Stafford Horne , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Nicholas Piggin , Christophe Leroy , "Naveen N. Rao" , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , "David S. Miller" , Andreas Larsson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , "Rafael J. Wysocki" , Daniel Lezcano , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , Andrew Donnellan , Benjamin Gray , Frederic Weisbecker , Xin Li , Kees Cook , Rick Edgecombe , Tony Battersby , Bjorn Helgaas , Brian Gerst , Leonardo Bras , Imran Khan , "Paul E. McKenney" , Rik van Riel , Tim Chen , David Vernet , Julia Lawall , linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-pm@vger.kernel.org, x86@kernel.org Subject: Re: [PATCH v2 00/14] Introducing TIF_NOTIFY_IPI flag Message-ID: References: <20240613181613.4329-1-kprateek.nayak@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240613181613.4329-1-kprateek.nayak@amd.com> Sender: Russell King (Oracle) On Thu, Jun 13, 2024 at 06:15:59PM +0000, K Prateek Nayak wrote: > o Dropping the ARM results since I never got my hands on the ARM64 > system I used in my last testing. If I do manage to get my hands on it > again, I'll rerun the experiments and share the results on the thread. > To test the case where TIF_NOTIFY_IPI is not enabled for a particular > architecture, I applied the series only until Patch 3 and tested the > same on my x86 machine with a WARN_ON_ONCE() in do_idle() to check if > tif_notify_ipi() ever return true and then repeated the same with > Patch 4 applied. Confused. ARM (32-bit) or ARM64? You patch 32-bit ARM, but you don't touch 64-bit Arm. "ARM" on its own in the context above to me suggests 32-bit, since you refer to ARM64 later. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!