From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A86FEE74902 for ; Mon, 2 Oct 2023 18:09:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238680AbjJBSJ3 (ORCPT ); Mon, 2 Oct 2023 14:09:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48466 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229546AbjJBSJ1 (ORCPT ); Mon, 2 Oct 2023 14:09:27 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 81B839E; Mon, 2 Oct 2023 11:09:24 -0700 (PDT) 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=xRxV8h6rdz6K6cFZgLZZ6o8bxTWhdijjWkOntbWqQCM=; b=h+7JSw+JYEH90+ILDXh+0kyRAB 9BEvky5UQXJeECAOmx0sHeXjH7gRhjDlAAmypWlUWCWy4DrAKZxXuqYeWiaw2RRQaDIE9Snl/VNK/ qtqkeeOeqshq14P/6BoWSv5svfNNSETIaKS1Kzq3qKHf12D0EI8RoYLUUcP2PhNidTXRMjXkiCF3f LrArseTYRl12WPMBw5h1bGqKy43n7iXn4i75YegcN+YgK9ANUwr/XIMsSFF75pVFs9D8GxbaBWXRJ 4RUOZ15/5yNx6DrMRgG1j059B8pRmToDDQlXcduywOJvD4fwwg+SP3XyNgJnZ684KA2bKmKhwWiKJ V6rk45wA==; Received: from [2001:8b0:10b:5:5205:71fd:de0:52fd] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qnNM7-00AQuS-Cj; Mon, 02 Oct 2023 18:09:19 +0000 Message-ID: Subject: Re: [PATCH v2] KVM: x86: Use fast path for Xen timer delivery From: David Woodhouse To: Sean Christopherson Cc: kvm , Paul Durrant , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , linux-kernel@vger.kernel.org Date: Mon, 02 Oct 2023 19:09:18 +0100 In-Reply-To: References: Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-NQeMivtfMykEP/nMeozY" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-NQeMivtfMykEP/nMeozY Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2023-10-02 at 10:41 -0700, Sean Christopherson wrote: > On Fri, Sep 29, 2023, David Woodhouse wrote: > > On Fri, 2023-09-29 at 08:16 -0700, Sean Christopherson wrote: > > > On Fri, Sep 29, 2023, David Woodhouse wrote: > > > > From: David Woodhouse > > > >=20 > > > > Most of the time there's no need to kick the vCPU and deliver the t= imer > > > > event through kvm_xen_inject_timer_irqs(). Use kvm_xen_set_evtchn_f= ast() > > > > directly from the timer callback, and only fall back to the slow pa= th > > > > when it's necessary to do so. > > >=20 > > > It'd be helpful for non-Xen folks to explain "when it's necessary".= =C2=A0 IIUC, the > > > only time it's necessary is if the gfn=3D>pfn cache isn't valid/fresh= . > >=20 > > That's an implementation detail. >=20 > And?=C2=A0 The target audience of changelogs are almost always people tha= t care about > the implementation. > > > Like all of the fast path functions that can be called from > > kvm_arch_set_irq_inatomic(), it has its own criteria for why it might r= eturn > > -EWOULDBLOCK or not. Those are *its* business. >=20 > And all of the KVM code is the business of the people who contribute to t= he kernel, > now and in the future.=C2=A0 Yeah, there's a small chance that a detailed= changelog can > become stale if the patch races with some other in-flight change, but eve= n *that* > is a useful data point.=C2=A0 E.g. if Paul's patches somehow broke/degrad= ed this code, > then knowing that what the author (you) intended/observed didn't match re= ality when > the patch was applied would be extremely useful information for whoever e= ncountered > the hypothetical breakage. Fair enough, but on this occasion it truly doesn't matter. It has nothing to do with the implementation of *this* patch. This code makes no assumptions and has no dependency on *when* that fast path might return -EWOULDBLOCK. Sometimes it does, sometimes it doesn't. This code just doesn't care one iota. If this code had *dependencies* on the precise behaviour of kvm_xen_set_evtchn_fast() that we needed to reason about, then sure, I'd have written those explicitly into the commit comment *and* tried to find some way of enforcing them with runtime warnings etc. But it doesn't. So I am no more inclined to document the precise behaviour of kvm_xen_set_evtchn_fast() in a patch which just happens to call it, than I am inclined to document hrtimer_cancel() or any other function called from the new code :) > > And in fact one of Paul's current patches is tweaking them subtly, but = that > > isn't relevant here. (But yes, you are broadly correct in your > > understanding.) > >=20 > > > > This gives a significant improvement in timer latency testing (usin= g > > > > nanosleep() for various periods and then measuring the actual time > > > > elapsed). > > > >=20 > > > > However, there was a reason=C2=B9 the fast path was dropped when th= is support > > >=20 > > > Heh, please use [1] or [*] like everyone else.=C2=A0 I can barely see= that tiny little =C2=B9. > >=20 > > Isn't that the *point*? The reference to the footnote isn't supposed to > > detract from the flow of the main text. It's exactly how you'll see it > > when typeset properly. > =C2=A0 > Footnotes that are "typeset properly" have the entire footnote in a diffe= rent > font+size.=C2=A0 A tiny number next to normal sized text just looks weird= to me. >=20 > And I often do a "reverse lookup" when I get to footnotes that are links,= e.g. to > gauge whether or not it's worth my time to follow the link.=C2=A0 Trying = to find the > tiny =C2=B9 via a quick visual scan is an exercise in frustration, at lea= st for the > monospace font I use for reading mail, e.g. it's much more readable on my= end in > an editor using a different font. >=20 > Which is a big benefit to sticking to the old and kludgly ASCII: it provi= des a > fairly consistent experience regardless of what client/font/etc each read= er is > using.=C2=A0 I'm not completely against using unicode characters, e.g. fo= r names with > characters not found in the Latin alphabet, but for code and things like = this, > IMO simpler is better. >=20 > > I've always assumed the people using [1] or [*] just haven't yet realis= ed > > that it's the 21st century and we are no longer limited to 7-bit ASCII.= Or > > haven't worked out how to type anything but ASCII. >=20 > Please don't devolve into ad hominem attacks against other reviews and co= ntributors. > If you want to argue that using footnote notation unicode is superior in = some way, > then by all means, present your arguments. Hey, you started the logical fallacies with the ad populum when you said "everyone else" :) Not that that was true; there are examples of =C2=B9 being used in the kernel changelog going back decades. I can just drop the footnote; there's not a huge amount of benefit in referring back to the old mail thread anyway. 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