From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-f69.google.com (mail-pl0-f69.google.com [209.85.160.69]) by kanga.kvack.org (Postfix) with ESMTP id 5C48D6B0006 for ; Mon, 26 Feb 2018 04:02:37 -0500 (EST) Received: by mail-pl0-f69.google.com with SMTP id n11so7372261plp.13 for ; Mon, 26 Feb 2018 01:02:37 -0800 (PST) Received: from EUR01-DB5-obe.outbound.protection.outlook.com (mail-db5eur01on0130.outbound.protection.outlook.com. [104.47.2.130]) by mx.google.com with ESMTPS id v10-v6si6350704plz.406.2018.02.26.01.02.35 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 26 Feb 2018 01:02:36 -0800 (PST) Subject: Re: [PATCH v5 0/4] vm: add a syscall to map a process memory into a pipe References: <1515479453-14672-1-git-send-email-rppt@linux.vnet.ibm.com> <20180220164406.3ec34509376f16841dc66e34@linux-foundation.org> From: Pavel Emelyanov Message-ID: <3122ec5a-7f73-f6b4-33ea-8c10ef32e5b0@virtuozzo.com> Date: Mon, 26 Feb 2018 12:02:25 +0300 MIME-Version: 1.0 In-Reply-To: <20180220164406.3ec34509376f16841dc66e34@linux-foundation.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton , Mike Rapoport Cc: Alexander Viro , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, criu@openvz.org, gdb@sourceware.org, devel@lists.open-mpi.org, rr-dev@mozilla.org, Arnd Bergmann , Michael Kerrisk , Thomas Gleixner , Josh Triplett , Jann Horn , Greg KH , Andrei Vagin On 02/21/2018 03:44 AM, Andrew Morton wrote: > On Tue, 9 Jan 2018 08:30:49 +0200 Mike Rapoport wrote: > >> This patches introduces new process_vmsplice system call that combines >> functionality of process_vm_read and vmsplice. > > All seems fairly strightforward. The big question is: do we know that > people will actually use this, and get sufficient value from it to > justify its addition? Yes, that's what bothers us a lot too :) I've tried to start with finding out if anyone used the sys_read/write_process_vm() calls, but failed :( Does anybody know how popular these syscalls are? If its users operate on big amount of memory, they could benefit from the proposed splice extension. -- Pavel -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org