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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 48940C79FB6 for ; Wed, 9 Sep 2026 17:51:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To: Content-Type:MIME-Version:References:Message-ID:Subject:To:From:Date:Reply-To :Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=evxkjkjKKox5DEjMvr/MUguEcpXOS0izuaXRXX60QIc=; b=4k3qqiHrmaIgMuVyfm8QUaWrC0 rY1wOtWnt5tpuHHKMCh2gCYkc/DtKmk7eZpYScW+K3huzhnxgqWOWqRvSClA+fuRCD7zi0HXDDtNc cvAO8EEHgb1aj/+eq+m/J1IsmY4Hp5dTUptuBro2gYrkrXimw7beqI/o5LwLBNk7aimw6Lk4uZm9W 4dTC5RXW9iwph2OAE7YmpomRxywIG4tnQ+C3r/iCh+Jh2IJWtKTXN9V8Yffk8Loe+T50bkJDyr6x9 U67A9wtVbBwSCY3Y+6kQTFx7AQQflnsyVF9egtARxboSOIkt8uHnSLAiGV8WZxW0cIZx8t/FXcOKd +BNzUbBw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x4MRu-0000000CXYy-1hBU; Wed, 09 Sep 2026 17:51:06 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x4MRr-0000000CXY9-1OsC for linux-arm-kernel@lists.infradead.org; Wed, 09 Sep 2026 17:51:04 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 0CF9F1576; Wed, 9 Sep 2026 10:50:57 -0700 (PDT) Received: from localhost (unknown [10.2.196.114]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6382C3F528; Wed, 9 Sep 2026 10:51:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1788976260; bh=7Vhuf1iZFkwe6WdcpSNqvT1waKG31SWv7t0DuAd1j/8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=lCkvkSUjVmgC63A8DcgNLu8rYIyPcrokQcrsyLqXVqan9fYv+ENwYTis7kB0+VFpP K5e2UMBtgg3NkTJMAUjPp06SQ3F9foXYseWr+p6ou2e8ah+dq+xO5SbENz1WLdv2Zc 4VQet3EFP0My6FkdBUlclD/4xU/7JzYladQ+KI9Y= Date: Wed, 9 Sep 2026 18:50:58 +0100 From: Leo Yan To: "Bouron, Justinien" Subject: Re: [PATCH] arm64: Add user and kernel page-fault tracepoints Message-ID: <20260909175058.GE200420@e132581.arm.com> References: <20260520045524.75670-1-jbouron@amazon.com> <20260520073606.GA101133@e132581.arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260909_105103_422274_190DF47B X-CRM114-Status: GOOD ( 13.17 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , "Kudrjavets, Gunnar" , Ryan Roberts , Quentin Perret , Catalin Marinas , Kevin Brodsky , "linux-kernel@vger.kernel.org" , David Hildenbrand , Lorenzo Stoakes , Will Deacon , "linux-arm-kernel@lists.infradead.org" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Justinien, On Wed, Sep 09, 2026 at 01:13:42PM +0000, Bouron, Justinien wrote: > Leo, > > Thank you for the feedback. I've posted a second revision at > https://lore.kernel.org/lkml/20260902115216.49158-1-jbouron@amazon.com/, though > it doesn't seem to be getting much traction. This should be in the arm64 maintainers' scope (v1 caught my attention due to it mentioned perf related things). I think the main question is these tracepoints overlap with perf sw events. Could you elaborate on why ftrace tracepoints are necessary? ('perf record' and 'perf script' can provide similar info and we can avoid extra latency). If the maintainers think this patch is reasonable, I'd be happy to help test it. Thanks, Leo