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[209.132.180.67]) by mx.google.com with ESMTP id s190si3046968pgc.753.2018.02.03.06.51.40; Sat, 03 Feb 2018 06:51:55 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=twosheds.20170209 header.b=HPJbvkGa; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752506AbeBCOq6 (ORCPT + 99 others); Sat, 3 Feb 2018 09:46:58 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:42506 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751869AbeBCOqz (ORCPT ); Sat, 3 Feb 2018 09:46:55 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=twosheds.20170209; h=Mime-Version:Date:Content-Type: References:In-Reply-To:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=pQoLAhQzYLhqs+a0UuMhzjILXURsv9gTRV8/0ZInEec=; b=HPJbvkGa+j6zpDs8DvxTdn7M+ RiSX4gjbZB3GgAEmtkiGBHcomdBJOs3q+Tyrrpx3KzCU+7dNeXv4R4wzWFh92GOoBVfN7KJTFslAQ QYb7imLaS7lRytSrUtDsOr5BmRglitckD3v/be1ndd6G15QEp/m3yFGttZ2UWLK8o4VD+LJ8SOxqA FYB5LUlmbx0UvVagXfg9/Ch1izKclFUq/OFEHQtUJ8HeQdJOOqdXvQNJcctlv1Qc9zlBQ769TuN9e 4TnzoMPxsn7sHV5PZs1sPlAZRNLZMiyKqUb304Pk0lFYp9+d5PRKU4O4ccUVWt1ci2WPnQMc0q+X2 vGUileYEA==; Received: from [2001:8b0:10b:1:b946:517a:ffef:148f] by twosheds.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1ehz5b-0002F7-PQ; Sat, 03 Feb 2018 14:46:47 +0000 Message-ID: <1517669207.31953.120.camel@infradead.org> Subject: Re: [PATCH] KVM: x86: Reduce retpoline performance impact in slot_handle_level_range() From: David Woodhouse To: Alan Cox Cc: Linus Torvalds , Thomas Gleixner , KarimAllah Ahmed , sironi@amazon.de, the arch/x86 maintainers , KVM list , Paolo Bonzini , Linux Kernel Mailing List , Borislav Petkov , Peter Zijlstra In-Reply-To: <20180202212321.5186c13c@alans-desktop> References: <1517583559-424-1-git-send-email-dwmw@amazon.co.uk> <1517599033.31953.71.camel@infradead.org> <20180202212321.5186c13c@alans-desktop> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-n9kpRxHhtwGhOLVLRHkG" Date: Sat, 03 Feb 2018 14:46:47 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-n9kpRxHhtwGhOLVLRHkG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2018-02-02 at 21:23 +0000, Alan Cox wrote: > In addition the problem with switch() is that gcc might decide in some > cases that the best way to implement your switch is an indirect call > from a lookup table. That's also true of the =C2=A0 if (ptr =3D=3D usualfunction) =C2=A0 =C2=A0 =C2=A0usualfunction(); =C2=A0 else =C2=A0 =C2=A0 =C2=A0*ptr(); construct. Especially if GCC doesn't take into account the increased cost of indirect branches with retpoline. > For the simple case how about wrapping the if into >=20 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0call_likely(foo->bar, usualfunction, args) >=20 > as a companion to=C2=A0 >=20 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0foo->bar(args) >=20 > that can resolve to nothing special on architectures that don't need it, > an if/else case on platforms with spectre, and potentially clever > stuff on any platform where you can beat the compiler by knowing > probabilities it can't infer ? Yeah. I'm keen on being able to use something like alternatives to *change* 'usualfunction' at runtime though. I suspect it'll be a win for stuff like dma_ops. But I'm also keen to actually base such things on real data, not just go randomly "optimising" stuff just because we can. Let's try to make sure we fix up the real bottlenecks, and not just go crazy. --=-n9kpRxHhtwGhOLVLRHkG Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEFQw ggUxMIIEGaADAgECAhBNRhEyk/HZ7naOeTHWrzuAMA0GCSqGSIb3DQEBCwUAMIGXMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYD VQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBDbGllbnQgQXV0aGVu dGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xNzEyMjEwMDAwMDBaFw0xODEyMjEyMzU5 NTlaMCQxIjAgBgkqhkiG9w0BCQEWE2R3bXcyQGluZnJhZGVhZC5vcmcwggEiMA0GCSqGSIb3DQEB AQUAA4IBDwAwggEKAoIBAQDgzLNWa18DNpGUj/ZeH0Sgz53ESIbzdPw3OJeuNP6jZhxZojbyfxbM hETscxI/Hj6UZ4a7sHm5BkVjlsB1Af2Za/PXUt8MmLAcPMHkMPGunvkUibEvblDvpqMkQZlaZM+t 5PqFmWkbehLaEvbpNY7dmEAAeKh4klTzJzrr5AAzaCQ32cA2e3+DEIv5O5l9ViMIjy/JM+xMQrfX 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