From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751425Ab2DRG0J (ORCPT ); Wed, 18 Apr 2012 02:26:09 -0400 Received: from devils.ext.ti.com ([198.47.26.153]:42903 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751235Ab2DRGZ4 (ORCPT ); Wed, 18 Apr 2012 02:25:56 -0400 From: Venkatraman S To: , CC: , , , , , Venkatraman S , Alex Lemberg Subject: [RFC PATCH 03/11] block: Add queue attributes to manage dpmg and swapin requests Date: Wed, 18 Apr 2012 11:55:24 +0530 Message-ID: <1334730332-22244-4-git-send-email-svenkatr@ti.com> X-Mailer: git-send-email 1.7.10.rc2 In-Reply-To: <1334730332-22244-1-git-send-email-svenkatr@ti.com> References: <1334730332-22244-1-git-send-email-svenkatr@ti.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add block queue properties to identify and manage demand paging and swap read requests differently. sysfs entries are included to enable or disable this feature at runtime. Signed-off-by: Venkatraman S Signed-off-by: Ilan Smith Signed-off-by: Alex Lemberg --- block/blk-sysfs.c | 16 ++++++++++++++++ include/linux/blkdev.h | 8 ++++++++ 2 files changed, 24 insertions(+) diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index cf15001..764de9f 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -213,6 +213,8 @@ queue_store_##name(struct request_queue *q, const char *page, size_t count) \ } QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1); +QUEUE_SYSFS_BIT_FNS(expedite_dmpg, EXP_DMPG, 0); +QUEUE_SYSFS_BIT_FNS(expedite_swapin, EXP_SWAPIN, 0); QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0); QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0); #undef QUEUE_SYSFS_BIT_FNS @@ -387,6 +389,18 @@ static struct queue_sysfs_entry queue_random_entry = { .store = queue_store_random, }; +static struct queue_sysfs_entry queue_dmpg_entry = { + .attr = {.name = "expedite_demandpaging", .mode = S_IRUGO | S_IWUSR }, + .show = queue_show_expedite_dmpg, + .store = queue_store_expedite_dmpg, +}; + +static struct queue_sysfs_entry queue_swapin_entry = { + .attr = {.name = "expedite_swapping", .mode = S_IRUGO | S_IWUSR }, + .show = queue_show_expedite_swapin, + .store = queue_store_expedite_swapin, +}; + static struct attribute *default_attrs[] = { &queue_requests_entry.attr, &queue_ra_entry.attr, @@ -409,6 +423,8 @@ static struct attribute *default_attrs[] = { &queue_rq_affinity_entry.attr, &queue_iostats_entry.attr, &queue_random_entry.attr, + &queue_dmpg_entry.attr, + &queue_swapin_entry.attr, NULL, }; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 606cf33..fd620b9 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -420,6 +420,8 @@ struct request_queue { #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ +#define QUEUE_FLAG_EXP_DMPG 19 /* Expedite Demand paging requests */ +#define QUEUE_FLAG_EXP_SWAPIN 20 /* Expedit page swapping */ #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ (1 << QUEUE_FLAG_STACKABLE) | \ @@ -506,6 +508,12 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) +#define blk_queue_exp_dmpg(q) \ + test_bit(QUEUE_FLAG_EXP_DMPG, &(q)->queue_flags) + +#define blk_queue_exp_swapin(q) \ + test_bit(QUEUE_FLAG_EXP_SWAPIN, &(q)->queue_flags) + #define blk_noretry_request(rq) \ ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ REQ_FAILFAST_DRIVER)) -- 1.7.10.rc2