From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7B67C34AB12 for ; Wed, 29 Oct 2025 10:24:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761733452; cv=none; b=ME3iPv/KVKjjSid37+1WDfIB2wCSGGgqGCveoGH8JZo0pKAVCVYzgSkQjcS+jgOxWjxVaz3iLxVGmer+K3A9rcwcoRjtoEyXFGy9loXK7bVNNSyoN1DOYJH/PmSVFt4J3tpCAlv2xb638l/muAd3RoYz6zDuTM+8x5LBHcBvl8M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761733452; c=relaxed/simple; bh=7FPIAlaSMQVMnw08rBMcPCE2W4qDvZkdq1QLYzST4CY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=K/FOws1RBs5uF8BjCP70FB2NPs1AuermfTjeA46n571p2IbE/MV4gvydSHlkTYZ3YLFW+OvBwXALv4GGjsSrTN514Dy9Z+Jo/cbZZm7nEZ+9gHl0LUOZmKt3UMFL5tqidbnimuGfiXYwcxNnN6OhEiARlhSO0gjkeGWYrcUNHS0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=DExvI5uZ; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="DExvI5uZ" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=7A0r7kNcXmywV0vSi5O47M2dCOMeNz2cGEoE+qzOrtI=; b=DExvI5uZaNlOi40HDGKpze0EXl gOYgYVOlxhva7H7bEjUurPd86P2w5APwNso99dqvg2jPwTpJ2zxt2RISXqdQiz8uojPTCzahEhFhE G2/hzeyH+qaiva/CmEzR7NgGXA/ZTznD8bumVH/vutFoH1l3kPur+jzFFO0qZxIcv7JCCxs6RV+oi AdfjjjVYfqSmPGz+qGxwE8SOn/5L5vO953JoObHAenkyS/Jpc8sBjUbLKgNgHMH6QMav4cNluM3YV epf11kKg6CuY0qUSFjOHuXzsGINdxTcx65J3h/7ajBJFHKbZy3AjwnBKQf/BLE2GwTS5IdeKXW7Wl ExXw/JUg==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vE3LT-00000007GPU-32Fb; Wed, 29 Oct 2025 10:24:01 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 5265F302FD7; Wed, 29 Oct 2025 11:23:59 +0100 (CET) Date: Wed, 29 Oct 2025 11:23:59 +0100 From: Peter Zijlstra To: Thomas Gleixner Cc: LKML , Michael Jeanson , Jens Axboe , Mathieu Desnoyers , "Paul E. McKenney" , x86@kernel.org, Sean Christopherson , Wei Liu Subject: Re: [patch V6 00/31] rseq: Optimize exit to user space Message-ID: <20251029102359.GH988547@noisy.programming.kicks-ass.net> References: <20251027084220.785525188@linutronix.de> 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: <20251027084220.785525188@linutronix.de> On Mon, Oct 27, 2025 at 09:44:14AM +0100, Thomas Gleixner wrote: > Thomas Gleixner (31): > rseq: Avoid pointless evaluation in __rseq_notify_resume() > rseq: Condense the inline stubs > rseq: Move algorithm comment to top > rseq: Remove the ksig argument from rseq_handle_notify_resume() > rseq: Simplify registration > rseq: Simplify the event notification > rseq, virt: Retrigger RSEQ after vcpu_run() > rseq: Avoid CPU/MM CID updates when no event pending > rseq: Introduce struct rseq_data > entry: Cleanup header > entry: Remove syscall_enter_from_user_mode_prepare() > entry: Inline irqentry_enter/exit_from/to_user_mode() > sched: Move MM CID related functions to sched.h > rseq: Cache CPU ID and MM CID values > rseq: Record interrupt from user space > rseq: Provide tracepoint wrappers for inline code > rseq: Expose lightweight statistics in debugfs > rseq: Provide static branch for runtime debugging > rseq: Provide and use rseq_update_user_cs() > rseq: Replace the original debug implementation > rseq: Make exit debugging static branch based > rseq: Use static branch for syscall exit debug when GENERIC_IRQ_ENTRY=y > rseq: Provide and use rseq_set_ids() > rseq: Separate the signal delivery path > rseq: Rework the TIF_NOTIFY handler > rseq: Optimize event setting > rseq: Implement fast path for exit to user > rseq: Switch to fast path processing on exit to user > entry: Split up exit_to_user_mode_prepare() > rseq: Split up rseq_exit_to_user_mode() > rseq: Switch to TIF_RSEQ if supported Applied to tip/core/rseq.