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 E095D443A88; Wed, 12 Aug 2026 13:46:23 +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=1786542386; cv=none; b=fQeLk2fCkGUULFfWAcbrVtcO4akpyyGJ2GKNHy3E3ux8IEZMQLHLhR9m4xpgQ2NifKuq+vNyA0FJe3H6inzdJxnlEmz2xJKbxhicWtREZhtthNMNIuHc9CUDVwN3Onbof26Vcmw7IlOGNNZlc8RjYAla8CnNUK38YzZ4ArSahyg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786542386; c=relaxed/simple; bh=bCYYclSfRjhWt4hHcIoVE03AahFLbGrrBILx/n0UxMk=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Hf1slmwFTBykh6Cgp7jQbq7I1GaXnlwK6L87IoL9+MJpR/K6wHCnNuD6igDdFocQ+/0Su2vFaHQH1AS0HdPSyGpbMVWD+N88+T9hp+iDLNqL130CAGWcRa4RuD4hTm0LC5AZcbI4rac9ZmdgW8PojJa9t00alCykpmcR1CTLC94= 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=SjCc4uRC; 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="SjCc4uRC" 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=bCYYclSfRjhWt4hHcIoVE03AahFLbGrrBILx/n0UxMk=; b=SjCc4uRCFK/p5+0YoMXlFCpfLx NLtnTIkBF9OOAweUrQFJJ4nf65HVw+aa5eo0kq10MAVpjU6fq+Uax74XCGHb1+luKneBglHR4y+z3 eY22ZDysZ7QlVtQhGHXNKIkhvT/ykLHahrng53dQyi+D4xjuB+wAd2oXeMQhkP3JjOHJheVpZ/cuJ bajyFX53jz22Lm5sgXYYsQ2XiYAxUZVt6OxV2l2m7x6aOwcQ0Moyh6xdNp1gEvf1D4Ev9jgtaq2A3 0Cl7KZdvDli/uiAAzT84Y1VrW2fBsCvdhHpoutikwYbongb8wmmEVTRG9KpIdzVquNtcd6wqILOuV MtYbGA/g==; Received: from [2001:8b0:10b:5:a3a3:d97e:a004:df29] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wu9Hb-000000023m5-3jHr; Wed, 12 Aug 2026 13:46:15 +0000 Message-ID: Subject: Re: [PATCH] mm/mmu_notifier: Remove non_block_start/end() from notifier invocation From: David Woodhouse To: Jason Gunthorpe Cc: 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 , =?ISO-8859-1?Q?J=E9r=F4me?= Glisse , Christian =?ISO-8859-1?Q?K=F6nig?= , "Paul E. McKenney" , Sean Christopherson , Paolo Bonzini , linux-mm@kvack.org, kvm@vger.kernel.org, linux-rt-devel@lists.linux.dev, linux-kernel@vger.kernel.org Date: Wed, 12 Aug 2026 14:46:08 +0100 In-Reply-To: <20260812122759.GA662699@ziepe.ca> References: <20260811135537.GC544626@ziepe.ca> <1d669aca4ffee797b9c29215382444a5b23624b3.camel@infradead.org> <20260811142730.GG544626@ziepe.ca> <20260811104229.72fdd928@gandalf.local.home> <37b83b429b9f14ea6ad4ca1c13cc8e565ec09033.camel@infradead.org> <44c51ace9b0dc44b795f6f48c91cda440eed910b.camel@infradead.org> <20260812122759.GA662699@ziepe.ca> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-7FyFUaYUmO0qDCpcWr3C" 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 --=-7FyFUaYUmO0qDCpcWr3C Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2026-08-12 at 09:27 -0300, Jason Gunthorpe wrote: > On Wed, Aug 12, 2026 at 09:21:31AM +0100, David Woodhouse wrote: > > On Wed, 2026-08-12 at 10:14 +0200, Michal Hocko wrote: > > > On Tue 11-08-26 16:24:48, David Woodhouse wrote: > > > [...] > > > > I had a second reason for disabling the overzealous check too: to a= llow > > > > SRCU grace periods within the notifier callbacks. > > >=20 > > > Is there a way that srcu barrier could cause an indirect dependency o= n > > > memory allocation? In other words what might block the scru to comple= te? > >=20 > > Not after https://lore.kernel.org/all/6eed3fe3461e9690b486ca98fa7563f60= d3940ff.camel@infradead.org/ >=20 > The user of the SRCU might have a read side that wraps an allocate. In > general it is not safe. Sure, the *general* case of Sleepable RCU can do all kinds of stuff in the read-side sections. But in *this* case they were all read_lock_irqsave() thus far, and they absolutely categorically do not. > I'm skeptical that without special API and documentation the KVM > special use of SRCU you've outlined will not remain working long term > too.. I hear you. I'm less sceptical, given the use case, but I'll certainly concede that the universe is known for inventing better idiots. I'm certainly not averse to having a wrapper so that the read sections don't just srcu_read_lock() directly, but also get a sanity check (non_block_start? local_irq_save? what would it actually be? does it have to be different for the hardirq vs. process-context invocations?) for free. Or instead of a GPC-specific wrapper, do we make it a first-class SRCU citizen, SRCU_READ_FLAVOR_ATOMIC? If it disables preemption, we'd know that lock+unlock must happen on the *same* CPU, which could potentially simplify my new try_synchronize_srcu() and/or allow for a *spinning* grace period if we really do want that (although I'm unconvinced; it's *latency* we care about here, and punting to the WQ when we *already* have to wait is fair enough). Either way, I see that as a mostly cosmetic follow-on from the real fixes I'm chasing here. --=-7FyFUaYUmO0qDCpcWr3C Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE AxMxRGlnaUNlcnQgQXNzdXJlZCBHMiBTTUlNRSBSU0E0MDk2IFNIQTM4NCAyMDI0IENBMTCCAiIw DQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAOfSIeC0vv1xPQ+dgSxbIIrkaru6skAWJYaGFzmv q4Kq+2wU2jxhcWlJg/JeP5jEkq/LM3pn5aaLao79j+XRmS7J1ZpJKUODJVoM4s9MQJhTMvo4qS5Z S64g6QR7Obkz3I1Lr3aWeSBmDDEyzue+NKtuWZ1Cxy3RdXo/w5HgRc3l2AercOM3Gt1XonTzEtTb 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