From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752132AbaBZMbo (ORCPT ); Wed, 26 Feb 2014 07:31:44 -0500 Received: from mail-ee0-f44.google.com ([74.125.83.44]:33736 "EHLO mail-ee0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750918AbaBZMbi (ORCPT ); Wed, 26 Feb 2014 07:31:38 -0500 From: Sergey Senozhatsky To: Minchan Kim Cc: Andrew Morton , Jerome Marchand , Nitin Gupta , linux-kernel@vger.kernel.org, Sergey Senozhatsky Subject: [PATCHv8 0/6] add compressing abstraction and multi stream support Date: Wed, 26 Feb 2014 15:27:53 +0300 Message-Id: <1393417679-13657-1-git-send-email-sergey.senozhatsky@gmail.com> X-Mailer: git-send-email 1.9.0.291.g027825b Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patchset introduces zcomp compression backend abstraction adding ability to support compression algorithms other than LZO; support for multi compression streams, making parallel compressions possible. v7->v8 (reviewed by Minchan Kim): -- merge patches 'add multi stream functionality' and 'enable multi stream compression support in zram' -- return status code from set_max_streams knob and print message on error -- do not use atomic type for ->avail_strm -- return back: allocate by default only one stream for multi stream backend -- wake sleeping write in zcomp_strm_multi_put() only if we put stream to idle list -- minor code `nitpicks' v6->v7 (reviewed by Minchan Kim): -- enable multi and single stream support out of the box (drop ZRAM_MULTI_STREAM config option) -- add set_max_stream knob, so we can adjust max number of compression streams in runtime (for multi stream backend at the moment) -- minor code `nitpicks' v5->v6 (reviewed by Minchan Kim): -- handle single compression stream case separately, using mutex locking, to address perfomance regression -- handle multi compression stream using spin lock and wait_event()/wake_up() -- make multi compression stream support configurable (ZRAM_MULTI_STREAM config option) v4->v5 (reviewed by Minchan Kim): -- renamed zcomp buffer_lock; removed src len and dst len from compress() and decompress(); not using term `buffer' and `workmem' in code and documentation; define compress() and decompress() functions for LZO backend; not using goto's; do not put idle zcomp_strm to idle list tail. v3->v4 (reviewed by Minchan Kim): -- renamed compression backend and working memory structs as requested by Minchan Kim; fixed several issues noted by Minchan Kim. Sergey Senozhatsky (6): zram: introduce compressing backend abstraction zram: use zcomp compressing backends zram: factor out single stream compression zram: add multi stream functionality zram: add set_max_streams knob zram: document max_comp_streams Documentation/ABI/testing/sysfs-block-zram | 9 +- Documentation/blockdev/zram.txt | 31 ++- drivers/block/zram/Makefile | 2 +- drivers/block/zram/zcomp.c | 318 +++++++++++++++++++++++++++++ drivers/block/zram/zcomp.h | 59 ++++++ drivers/block/zram/zcomp_lzo.c | 48 +++++ drivers/block/zram/zram_drv.c | 98 +++++---- drivers/block/zram/zram_drv.h | 10 +- 8 files changed, 528 insertions(+), 47 deletions(-) create mode 100644 drivers/block/zram/zcomp.c create mode 100644 drivers/block/zram/zcomp.h create mode 100644 drivers/block/zram/zcomp_lzo.c -- 1.9.0.291.g027825b