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 35A82361960; Tue, 1 Sep 2026 22:54:00 +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=1788303246; cv=none; b=QMrDTPnW+kra6glL8fT+VZQs7kLbGQ7Fd4Lj81AkqDhEUO3OyPp0UUsx8Fhw3AQc4L4gvm49A5u9gzmZF/ByFciatHCzNv9TS2YEEI1lpCeO9noIsMYfdrVwjbeg7vd6Eo74S98T8bMmZrhonhmsIto4vSU882Lr8+EF7j6SeJE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788303246; c=relaxed/simple; bh=QZ4SRhoz/1vFsTh9F518CyQRVF3nCqU7OfLuICgZ8tI=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=kQiMVH73WR1G/wBEFQqezSBrWarb9OreMb9b4AGuRg7469Oxu+nr6N5QeF3UmX5iExo0WHuLpAms2e+3Q47qaWNVBoACRTXKHXE7e/BiuLBONhWnwIpkEohLcayVgVzXNefpLPyAqDFXAkLvkyZyu4ccbTDFArECoqa9VZF8k/M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=jDWrOyPy; 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=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="jDWrOyPy" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=QZ4SRhoz/1vFsTh9F518CyQRVF3nCqU7OfLuICgZ8tI=; b=jDWrOyPyPYSijvGUkZiigBZs9l gZ3WIx24TQZKtFXc8UYXHc9Fh/2Ebf8lLWbH4XWOArxmHAzXSCefbZKxBYFvj4y4Msafw6nLqV7Xn +FD6ExFS0dh9zfsGtUL2vooqUnG5hsFsy9WzDWJ/95KRxTpG5jZVihDJsRmAahvJUgSlEOmejALi1 8i5/mgOZA72lUyG0luVx0qYzZJqVdYXu4RI+/Gia2Us0bkh+bZDC6sPOkzGWgB04O4BTn8ZmsooH1 EaM0tsGmme8Vuv4d682pO1gADrNe34m2TslxWpkJIHef5zsgQ9ois5g6Xj7PuMXJqdR1aDjv3gpFZ 6kPvJzLA==; Received: from [2001:8b0:10b:5:d943:510:b128:832d] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1x1XMR-00000005tLS-3P1p; Tue, 01 Sep 2026 22:53:48 +0000 Message-ID: <19e2a25c50a551398dec060fe0e5d3720b027ad2.camel@infradead.org> Subject: Re: [PATCH] mm/mmu_notifier: Remove non_block_start/end() from notifier invocation From: David Woodhouse To: Sean Christopherson , "Paul E. McKenney" Cc: Jason Gunthorpe , Michal Hocko , Steven Rostedt , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Sebastian Andrzej Siewior , Clark Williams , Simona Vetter , Jerome Glisse , Christian Koenig , Paolo Bonzini , linux-mm@kvack.org, kvm@vger.kernel.org, linux-rt-devel@lists.linux.dev, linux-kernel@vger.kernel.org Date: Tue, 01 Sep 2026 23:53:26 +0100 In-Reply-To: References: <69567965-48fd-48c5-abb6-0699d7f5bd16@paulmck-laptop> <124af87fb49c267eeb26b8b4d952b9b1a5b3fb68.camel@infradead.org> <9427a8e0-3ba6-4f31-a35d-54429bd7e071@paulmck-laptop> <3d0463b6099d4fcde9a025a2f9e231d75303b61c.camel@infradead.org> <90d91673-a912-439f-98ee-e43285294486@paulmck-laptop> <8cd4aa65b1b499d4c614aa4cba445b6aeb89acf7.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-0CqYliZsQwF5rEce3NVr" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-0CqYliZsQwF5rEce3NVr Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2026-09-01 at 15:51 -0700, Sean Christopherson wrote: > On Tue, Sep 01, 2026, Paul E. McKenney wrote: > > On Tue, Sep 01, 2026 at 12:12:51PM -0700, Sean Christopherson wrote: > > > On Tue, Sep 01, 2026, David Woodhouse wrote: > > > > On Mon, 2026-08-31 at 17:58 -0700, Paul E. McKenney wrote: > > > > > On Fri, Aug 28, 2026 at 12:25:01AM +0100, David Woodhouse wrote: > > > > >=20 > > > > >=20 > > > > > > =C2=A0 * 23f10e07aba3 srcu: Add try_synchronize_srcu() for call= ers which can prove readers absent > > > > >=20 > > > > > I do not intend to provide a separate API for this given the poss= ibility > > > > > of indefinite postponement. > > > >=20 > > > > Makes sense. In that case, calling it internally from the 'right' > > > > places becomes important, as the callers who care can't do so for > > > > themselves. > > > >=20 > > > > We discussed the fact that synchronize_srcu_expedited() will also w= ant > > > > to use the same fast path. > > > >=20 > > > > I'm also looking back to Sean's call_srcu_expedited() patch from Ma= rch: > > > > https://lore.kernel.org/all/20260309193059.2244645-1-seanjc@google.= com/ > > > >=20 > > > >=20 > > > > > Due to differences in how VMMs manage guest devices, and in the > > > > > architecture being emulated by userspace, some updates trigger ca= ll_srcu() > > > > > with concurrent readers (i.e. while the VM is active), while othe= rs occur > > > > > without readers, e.g. when configuring devices during a pre-boot = setup. > > > > > For the later case (no concurrent readers), using the vanilla cal= l_srcu() > > > > > is problematic, as it can kick off a normal grace period (totally= fine for > > > > > freeing the object) and effectively transfer the non-expedited gr= ace period > > > > > to the upcoming synchronize_srcu_expedited(). > > > >=20 > > > > So the offending path uses call_srcu() and triggers a normal GP, wh= ile > > > > the victim calls synchronize_srcu_expedited() and gets stuck behind > > > > that non-expedited GP. > > > >=20 > > > > Sean, if the victim is the "no concurrent readers" code path, as yo= u > > > > said above, do you think the fast path in the victim should suffice= , > > > > without the cost of an expedited GP for every bus registration? > > >=20 > > > IIUC, you're asking if being able to use try_synchronize_srcu() for t= he fast/happy > > > of synchronize_srcu_expedited() (i.e. for kvm_swap_active_memslots()(= )), even if > > > there's an in-flight GP, would suffice for a fix of the regression in= troduced by > > > commit 7d9a0273c459 ("KVM: Avoid synchronize_srcu() in kvm_io_bus_reg= ister_dev()"). > > >=20 > > > If my understanding is correct, then yes, that should work, and presu= mably would > > > be a notable improvement overall. > >=20 > > Then we could abandon synchronize_rcu_atomic()?=C2=A0 That would not be= a > > bad thing from my perspective. > >=20 > > Just to be sure, please note that synchronize_rcu_expedited() can and > > sometimes does sleep in order to avoid odd corner cases that could > > otherwise pointlessly monopolize a CPU. >=20 > I think one (or both) of us is confused.=C2=A0 I thought David was asking= if we could > avoiding adding call_srcu_expedited(), because the proposed try_synchroni= ze_srcu() > would fix a regression related to KVM's use of synchronize_srcu_expedited= (). Indeed. This is a *separate* problem, for which you had previously proposed adding call_srcu_expedited(), but it looks like having try_synchronize_scru() as a fast path of synchronize_srcu_expedited() would suffice. We do still need synchronize_srcu_atomic() for the MM notifier case for which we originally built it. > I don't think that has anything to do with non-sleepable RCU?=C2=A0 Or is= there a > separate discussion and/or implicitations I don't understand? I think the lack of 's' there was just a typo. 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