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 0654EC19F2A for ; Fri, 5 Aug 2022 03:02:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239674AbiHEDCF (ORCPT ); Thu, 4 Aug 2022 23:02:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35092 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229477AbiHEDCD (ORCPT ); Thu, 4 Aug 2022 23:02:03 -0400 Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 80F026E2E7 for ; Thu, 4 Aug 2022 20:02:02 -0700 (PDT) Received: from imladris.surriel.com ([96.67.55.152]) by shelob.surriel.com with esmtpsa (TLS1.2) tls TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1oJnb3-0003Gm-HD; Thu, 04 Aug 2022 23:01:57 -0400 Message-ID: <17b83f59efbc568c1fe3154f82a5300f3b4cfe24.camel@surriel.com> Subject: Re: [PATCH v2] x86,mm: print likely CPU at segfault time From: Rik van Riel To: Ingo Molnar Cc: Dave Hansen , x86@kernel.org, linux-kernel@vger.kernel.org, kernel-team@fb.com, Thomas Gleixner , Dave Jones , Andy Lutomirski Date: Thu, 04 Aug 2022 23:01:56 -0400 In-Reply-To: References: <20220804155450.08c5b87e@imladris.surriel.com> Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-sfo3Dr2t/UfbUKbWu9TK" User-Agent: Evolution 3.42.4 (3.42.4-1.fc35) MIME-Version: 1.0 Sender: riel@shelob.surriel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-sfo3Dr2t/UfbUKbWu9TK Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2022-08-04 at 22:17 +0200, Ingo Molnar wrote: >=20 > I've added the tidbit to the changelog that this only gets printed if > show_unhandled_signals (/proc/sys/kernel/print-fatal-signals) is The show_unhandled_signals variable seems to be controlled through /proc/sys/debug/exception-trace, and be on by default. Enabling print-fatal-signals makes the kernel a lot more chatty, and does not offer the same value in my experiments :) > enabled -=20 > which is off by default. So your patch expands upon a default-off > debug=20 > printout in essence - where utility maximization is OK. >=20 > Thanks, >=20 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Ingo >=20 --=20 All Rights Reversed. --=-sfo3Dr2t/UfbUKbWu9TK Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEKR73pCCtJ5Xj3yADznnekoTE3oMFAmLsiCQACgkQznnekoTE 3oM/ywf9HSQSyIONKrJrIXMTu8dioxtpaXBB5mYPrWK3LS1WCbblGzd1WxU9VO3G 3K8VVUfXd2FL8zRE7kmXYlu6qwRY5V0B9zmH8E0uG29dpMHcMRxN0Z7fH1MTbB+O a0l/vZlw/wYpUJGku7ww/2Wm0AKXvfOKqt6uLUlE4GrwA2kSOVWyZlgCVbC22gpV RyyjnXyAi5veIJbCcqFPInkay48dR3Ls3tVHs6sdbcz5qJH6KohkQQB+qrKs5GBK JT1qjgqgBipjTIz/YOzhZac2GCUyXwwYcXN142fi9gB38Ck+ihKxogk3cgT9RkTO QyjKN/farKOgDuHKGRT1GBVLNn54LQ== =HJ8/ -----END PGP SIGNATURE----- --=-sfo3Dr2t/UfbUKbWu9TK--