From patchwork Mon Apr 4 15:29:40 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 8741921 Return-Path: X-Original-To: patchwork-linux-block@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 3E223C0553 for ; Mon, 4 Apr 2016 15:29:15 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 5450D200EC for ; Mon, 4 Apr 2016 15:29:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 34648202BE for ; Mon, 4 Apr 2016 15:29:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752830AbcDDP3L (ORCPT ); Mon, 4 Apr 2016 11:29:11 -0400 Received: from mx2.suse.de ([195.135.220.15]:58874 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753575AbcDDP3J (ORCPT ); Mon, 4 Apr 2016 11:29:09 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 5BC30AC01; Mon, 4 Apr 2016 15:29:07 +0000 (UTC) Received: by quack.suse.cz (Postfix, from userid 1000) id 1F2BC80D31; Mon, 4 Apr 2016 17:29:45 +0200 (CEST) From: Jan Kara To: Jens Axboe Cc: linux-block@vger.kernel.org, Jeff Moyer , Jan Kara Subject: [PATCH 2/3] cfq-iosched: Expose microsecond interfaces Date: Mon, 4 Apr 2016 17:29:40 +0200 Message-Id: <1459783781-25537-3-git-send-email-jack@suse.cz> X-Mailer: git-send-email 2.6.2 In-Reply-To: <1459783781-25537-1-git-send-email-jack@suse.cz> References: <1459783781-25537-1-git-send-email-jack@suse.cz> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Spam-Status: No, score=-7.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jeff Moyer Expose interfaces to tune time slices of CFQ IO scheduler in microseconds. Signed-off-by: Jeff Moyer Signed-off-by: Jan Kara --- block/cfq-iosched.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 6b78493b369e..c7f1a70dd8f7 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -4681,6 +4681,21 @@ SHOW_FUNCTION(cfq_low_latency_show, cfqd->cfq_latency, 0); SHOW_FUNCTION(cfq_target_latency_show, cfqd->cfq_target_latency, 1); #undef SHOW_FUNCTION +#define USEC_SHOW_FUNCTION(__FUNC, __VAR) \ +static ssize_t __FUNC(struct elevator_queue *e, char *page) \ +{ \ + struct cfq_data *cfqd = e->elevator_data; \ + u64 __data = __VAR; \ + __data = div_u64(__data, NSEC_PER_USEC); \ + return cfq_var_show(__data, (page)); \ +} +USEC_SHOW_FUNCTION(cfq_slice_idle_us_show, cfqd->cfq_slice_idle); +USEC_SHOW_FUNCTION(cfq_group_idle_us_show, cfqd->cfq_group_idle); +USEC_SHOW_FUNCTION(cfq_slice_sync_us_show, cfqd->cfq_slice[1]); +USEC_SHOW_FUNCTION(cfq_slice_async_us_show, cfqd->cfq_slice[0]); +USEC_SHOW_FUNCTION(cfq_target_latency_us_show, cfqd->cfq_target_latency); +#undef USEC_SHOW_FUNCTION + #define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \ static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count) \ { \ @@ -4715,6 +4730,26 @@ STORE_FUNCTION(cfq_low_latency_store, &cfqd->cfq_latency, 0, 1, 0); STORE_FUNCTION(cfq_target_latency_store, &cfqd->cfq_target_latency, 1, UINT_MAX, 1); #undef STORE_FUNCTION +#define USEC_STORE_FUNCTION(__FUNC, __PTR, MIN, MAX) \ +static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count) \ +{ \ + struct cfq_data *cfqd = e->elevator_data; \ + unsigned int __data; \ + int ret = cfq_var_store(&__data, (page), count); \ + if (__data < (MIN)) \ + __data = (MIN); \ + else if (__data > (MAX)) \ + __data = (MAX); \ + *(__PTR) = (u64)__data * NSEC_PER_USEC; \ + return ret; \ +} +USEC_STORE_FUNCTION(cfq_slice_idle_us_store, &cfqd->cfq_slice_idle, 0, UINT_MAX); +USEC_STORE_FUNCTION(cfq_group_idle_us_store, &cfqd->cfq_group_idle, 0, UINT_MAX); +USEC_STORE_FUNCTION(cfq_slice_sync_us_store, &cfqd->cfq_slice[1], 1, UINT_MAX); +USEC_STORE_FUNCTION(cfq_slice_async_us_store, &cfqd->cfq_slice[0], 1, UINT_MAX); +USEC_STORE_FUNCTION(cfq_target_latency_us_store, &cfqd->cfq_target_latency, 1, UINT_MAX); +#undef USEC_STORE_FUNCTION + #define CFQ_ATTR(name) \ __ATTR(name, S_IRUGO|S_IWUSR, cfq_##name##_show, cfq_##name##_store) @@ -4725,12 +4760,17 @@ static struct elv_fs_entry cfq_attrs[] = { CFQ_ATTR(back_seek_max), CFQ_ATTR(back_seek_penalty), CFQ_ATTR(slice_sync), + CFQ_ATTR(slice_sync_us), CFQ_ATTR(slice_async), + CFQ_ATTR(slice_async_us), CFQ_ATTR(slice_async_rq), CFQ_ATTR(slice_idle), + CFQ_ATTR(slice_idle_us), CFQ_ATTR(group_idle), + CFQ_ATTR(group_idle_us), CFQ_ATTR(low_latency), CFQ_ATTR(target_latency), + CFQ_ATTR(target_latency_us), __ATTR_NULL };