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 990CCC636D6 for ; Thu, 26 Jan 2023 15:11:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229976AbjAZPLj (ORCPT ); Thu, 26 Jan 2023 10:11:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44074 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231440AbjAZPLd (ORCPT ); Thu, 26 Jan 2023 10:11:33 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4DC8814E96 for ; Thu, 26 Jan 2023 07:10:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1674745847; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=7QG6Sd9tYt9i9oyjRZB/m7JGOx0vpbuKAr/nqEOLMCI=; b=Svy8oPBa6R/lOtMNGNcXMySQozg5ub5rnBWuJ1H9hrjSvtsADvK12mWDUzv3coTGU3qZMu 4rl1dzwHIYzGvVL0bKu4stfTtyQOWVhm4pFaYLnoW/deG3wu4fDFiccO7oEn6CCQyrAxPk dtAN9e18QsKvwYJxbPZ3CIkXJN4kMOo= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-456-Pq3b_L0CMSSNTmEXsBRC9w-1; Thu, 26 Jan 2023 10:10:43 -0500 X-MC-Unique: Pq3b_L0CMSSNTmEXsBRC9w-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E8381181E3F4; Thu, 26 Jan 2023 15:10:41 +0000 (UTC) Received: from dhcp-27-174.brq.redhat.com (ovpn-194-60.brq.redhat.com [10.40.194.60]) by smtp.corp.redhat.com (Postfix) with SMTP id 763A9140EBF5; Thu, 26 Jan 2023 15:10:39 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Thu, 26 Jan 2023 16:10:39 +0100 (CET) Date: Thu, 26 Jan 2023 16:10:36 +0100 From: Oleg Nesterov To: Gregory Price Cc: Andrei Vagin , Gregory Price , LKML , "open list:DOCUMENTATION" , Peter Zijlstra , Andy Lutomirski , Gabriel Krisman Bertazi , Thomas Gleixner , Jonathan Corbet , Shuah Khan Subject: Re: [PATCH v6 1/2] ptrace,syscall_user_dispatch: Implement Syscall User Dispatch Suspension Message-ID: <20230126151035.GC4069@redhat.com> References: <20230125025126.787431-1-gregory.price@memverge.com> <20230125025126.787431-2-gregory.price@memverge.com> <20230126003008.GA31684@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On 01/26, Gregory Price wrote: > > So basic questions are: > 1) Andrei do you think any injection occurs during quiesce that can't be > worked around? > > 2) Oleg is the auto-clearing nature of the flag sufficient justification > for keeping SUSPEND? I understand that SUSPEND is more convenient for CRIU and more "safe". But. This kernel is already overbloated ;) IMO, if SUSPEND is not strictly necessary, it should be dropped. Oleg.