From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with ESMTP id 839396B01F2 for ; Wed, 28 Apr 2010 12:17:13 -0400 (EDT) Message-Id: <20100428161636.272097923@szeredi.hu> Date: Wed, 28 Apr 2010 18:16:36 +0200 From: Miklos Szeredi Subject: [RFC PATCH 0/6] fuse: implement zero copy read Sender: owner-linux-mm@kvack.org To: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: jens.axboe@oracle.com, akpm@linux-foundation.org, torvalds@linux-foundation.org List-ID: This series implements splice(2) to the fuse device. With this it's possible to move pages directly into the page cache of the fuse filesystem without ever having to copy the contents. The next series will implement splicing from the fuse device for zero copy write operations. Testing shows improved bandwidth and reduced system time (as expected). However there's still some overhead in shuffling pages between caches. Further improvements could be achieved by - implementing replace_page_cache_page() which atomically removes an old page and replaces it with a new one - implementing splice a-la O_DIRECT which, instead of populating the page cache, would just send/receive data directly in pipe buffers. Comments? Thanks, Miklos -- -- 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