Received: by 2002:a05:6a10:9e8c:0:0:0:0 with SMTP id y12csp2245043pxx; Sat, 31 Oct 2020 13:08:39 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyIIK5TddRWoZlDCFPIVsFErZHAOOxCnOwJMEBmIJ4ry1Dx3Z4HaYnxDmjFNXl3j9u+Cwgv X-Received: by 2002:aa7:da4d:: with SMTP id w13mr8827217eds.266.1604174919482; Sat, 31 Oct 2020 13:08:39 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1604174919; cv=none; d=google.com; s=arc-20160816; b=DHv5RZk2ul2azKKfTwLKm+GPUf2+iPPwlG3sMARBTHaHtxuCuyvsojkgpROgeSQtNM 3+gofdOrpvatiOwl6EAV7cOvybxn9ECj/bZnezzneV37BxJDzXo10Boq/ZrJUypvdkr8 p4f6OBfTh7rZVBE+hA3rNfS9nv+n97WoxeHscyogs4FcBTvdxWMRjYmUggRvZeVoxBRt QveVM6WkDBe+PabZXqwXFUpnnkmn8yOVi1hZZKBGCvhvBT7PGmEj2bg88acBxFNxA8ml xS26COABcd2lJ9vCCrmq20KCEjRZ9kpjUZ5bJWPeCS3AgbbYLGFpU22n+rWjwK34sal+ FeJg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date :dkim-signature; bh=1Spt7E/h+lOQId9KrMw1DcEaITriY24WYnLpjKmK2nY=; b=00v0tIE0Znc2xdkn7S18iD42Aphbo1sEFizCapR3ZkpGqoeRuwRacsn+umHVojJOY6 /KQquRpuaukQjtC+G47KYzjgqcbbmEXUTHYgN6A01AV30OchCeaZ3k+R+kGpgpp3sARh ayIhd2cTCdTW3Av9v95fzFLJw0GubrS/q1lFSDRSVO3lWIJaq30A5vBC33/DnJhiqqo6 G4JXgrYxVYcFXBCe6wM68e+9+pBTRHe4QMalz+YPS86oOvcrDpU6JhpSWO0jstOapS3l XcLLiDEOhjjpeiRT7Bvc+eqBJYaLhk8w51erZIa9Vb/CBNRlMz21JHu4bF7Pr9JopR7c /dNQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=P14brFCO; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id h14si2052876ejs.645.2020.10.31.13.08.15; Sat, 31 Oct 2020 13:08:39 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=P14brFCO; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728569AbgJaUFs (ORCPT + 99 others); Sat, 31 Oct 2020 16:05:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:33766 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728561AbgJaUFs (ORCPT ); Sat, 31 Oct 2020 16:05:48 -0400 Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 47CA0206F7; Sat, 31 Oct 2020 20:05:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604174747; bh=1Spt7E/h+lOQId9KrMw1DcEaITriY24WYnLpjKmK2nY=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=P14brFCOSpQW65Dbdx5U7se86/FZiSqKzg4jcdn4ytDHfpGGaWGUhXkfdWp4g1nEg ct+ZRPM3QAII1WWxbGoaBzAjOw07Cgx667qA/1efhlIPAle9uBia0Pc3BljgyDlVEb is27XL0W4OVlI0eaFhJX4/ZcXoBzySkEaO8gqfCY= Date: Sat, 31 Oct 2020 13:05:46 -0700 From: Andrew Morton To: Anand K Mistry Cc: linux-fsdevel@vger.kernel.org, asteinhauser@google.com, joelaf@google.com, tglx@linutronix.de, Alexey Dobriyan , Alexey Gladkov , Jonathan Corbet , Kees Cook , Mauro Carvalho Chehab , Michal Hocko , Mike Rapoport , NeilBrown , Peter Zijlstra , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] proc: Provide details on indirect branch speculation Message-Id: <20201031130546.d2b94345008e807f548dc068@linux-foundation.org> In-Reply-To: <20201030172731.1.I7782b0cedb705384a634cfd8898eb7523562da99@changeid> References: <20201030172731.1.I7782b0cedb705384a634cfd8898eb7523562da99@changeid> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 30 Oct 2020 17:27:54 +1100 Anand K Mistry wrote: > Similar to speculation store bypass, show information about the indirect > branch speculation mode of a task in /proc/$pid/status. Why is this considered useful?