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a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1747145151; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=CIQWasuI/5nFSHu2txE7aGa/G99P4UTJOWGIf1YUyEk=; b=24cqX4/Nv4i4V5EtjYOFUNJU6tNHI/Jr7DspZMyzvs+lQQRGKVVnlZdGwq7jbmQ9SW0qF5 rIvrpgQuw1d88JBe68vJNhE3uu2doFu7EkXtk2Ofkh4SgwKG/CAHMpzlnOSyR8piG1zQzC b0MXy+lGop0oBGklGLcd/vf9lI40Jr8= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1747145151; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=CIQWasuI/5nFSHu2txE7aGa/G99P4UTJOWGIf1YUyEk=; b=Qh4ZSxBag5YhIFVPUsgH/fuuEC/o2qX0SHLFWOO8slzKsEat/zXc8i1eqgQ9TeZcuotl7C BR/GNmNfoiMhLQAA== Date: Tue, 13 May 2025 16:05:51 +0200 (CEST) From: Miroslav Benes To: Peter Zijlstra cc: Sebastian Andrzej Siewior , linux-kernel@vger.kernel.org, live-patching@vger.kernel.org, Josh Poimboeuf , mingo@kernel.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, jpoimboe@kernel.org, jikos@kernel.org, pmladek@suse.com, joe.lawrence@redhat.com, Thomas Gleixner Subject: Re: [PATCH v2] sched,livepatch: Untangle cond_resched() and live-patching In-Reply-To: <20250513140310.GA25639@noisy.programming.kicks-ass.net> Message-ID: References: <20250509113659.wkP_HJ5z@linutronix.de> <20250513140310.GA25639@noisy.programming.kicks-ass.net> User-Agent: Alpine 2.21 (LSU 202 2017-01-01) 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 X-Spam-Level: X-Spam-Flag: NO X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; RCPT_COUNT_TWELVE(0.00)[18]; RCVD_COUNT_ZERO(0.00)[0]; MID_RHS_MATCH_FROMTLD(0.00)[]; FROM_HAS_DN(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; URIBL_BLOCKED(0.00)[infradead.org:email,suse.cz:email,linutronix.de:email]; DBL_BLOCKED_OPENRESOLVER(0.00)[linutronix.de:email,suse.cz:email] X-Spam-Score: -4.30 On Tue, 13 May 2025, Peter Zijlstra wrote: > On Tue, May 13, 2025 at 03:34:50PM +0200, Miroslav Benes wrote: > > Hi, > > > > thanks for the updated version. > > > > On Fri, 9 May 2025, Sebastian Andrzej Siewior wrote: > > > > > From: Peter Zijlstra > > > > > > With the goal of deprecating / removing VOLUNTARY preempt, live-patch > > > needs to stop relying on cond_resched() to make forward progress. > > > > > > Instead, rely on schedule() with TASK_FREEZABLE set. Just like > > > live-patching, the freezer needs to be able to stop tasks in a safe / > > > known state. > > > > > > Compile tested only. > > > > livepatch selftests pass and I also ran some more. > > > > > [bigeasy: use likely() in __klp_sched_try_switch() and update comments] > > > > > > Signed-off-by: Peter Zijlstra (Intel) > > > Signed-off-by: Sebastian Andrzej Siewior > > > > Acked-by: Miroslav Benes > > > > A nit below if there is an another version, otherwise Petr might fix it > > when merging. > > Petr or Peter? > > That is, who are we expecting to merge this :-) Petr Mladek if it goes through the live patching tree, you if tip. Feel free to pick it up :). > Anyway, I've zapped the line in my copy. Thanks! Miroslav