From patchwork Mon Oct 3 21:20:20 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shaohua Li X-Patchwork-Id: 9360943 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id EE5B16075E for ; Mon, 3 Oct 2016 21:21:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E2BDE28842 for ; Mon, 3 Oct 2016 21:21:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D797828A6E; Mon, 3 Oct 2016 21:21:09 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 249CC28A69 for ; Mon, 3 Oct 2016 21:21:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753232AbcJCVVH (ORCPT ); Mon, 3 Oct 2016 17:21:07 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:33659 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752994AbcJCVVC (ORCPT ); Mon, 3 Oct 2016 17:21:02 -0400 Received: from pps.filterd (m0044010.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id u93LJOJ3031421 for ; Mon, 3 Oct 2016 14:21:02 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=facebook; bh=2L+T5oo7BIIdTnSHvXQwaxhcNLEvQQgWUOfjny1gwcI=; b=pouKQsM9hh+lswKl34KyjHCqSnLRLDMU2taVOHjQxS97WRzoGUA067Ux2e9nBW8T9tcm efGgpH0MOoYGkOW9UzQH/UI/4y+Xsc9rk230O6BRBwxexaf52kCrS17xB+qbe4KO+iv6 v/S6TEhe53wWOhD2fZR7m6Sp59YsUE15Ns8= Received: from mail.thefacebook.com ([199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 25uwpd8s6u-8 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Mon, 03 Oct 2016 14:21:02 -0700 Received: from mx-out.facebook.com (192.168.52.123) by PRN-CHUB07.TheFacebook.com (192.168.16.17) with Microsoft SMTP Server (TLS) id 14.3.294.0; Mon, 3 Oct 2016 14:20:33 -0700 Received: from facebook.com (2401:db00:21:603d:face:0:19:0) by mx-out.facebook.com (10.223.100.97) with ESMTP id 371505c489af11e6a23724be0593f280-71df7a50 for ; Mon, 03 Oct 2016 14:20:32 -0700 Received: by devbig638.prn2.facebook.com (Postfix, from userid 11222) id 17D8742C1155; Mon, 3 Oct 2016 14:20:30 -0700 (PDT) From: Shaohua Li To: , CC: , , , , Subject: [PATCH v3 01/11] block-throttle: prepare support multiple limits Date: Mon, 3 Oct 2016 14:20:20 -0700 Message-ID: <6253ecb76916a42f0044fb13ac415e34d8ca5a9f.1475529372.git.shli@fb.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: References: X-FB-Internal: Safe MIME-Version: 1.0 X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-10-03_12:, , signatures=0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We are going to support high/max limit, each cgroup will have 2 limits after that. This patch prepares for the multiple limits change. Signed-off-by: Shaohua Li --- block/blk-throttle.c | 109 ++++++++++++++++++++++++++++++++------------------- 1 file changed, 68 insertions(+), 41 deletions(-) diff --git a/block/blk-throttle.c b/block/blk-throttle.c index a3ea826..964b713 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -83,6 +83,11 @@ enum tg_state_flags { #define rb_entry_tg(node) rb_entry((node), struct throtl_grp, rb_node) +enum { + LIMIT_MAX = 0, + LIMIT_CNT = 1, +}; + struct throtl_grp { /* must be the first member */ struct blkg_policy_data pd; @@ -120,10 +125,10 @@ struct throtl_grp { bool has_rules[2]; /* bytes per second rate limits */ - uint64_t bps[2]; + uint64_t bps[2][LIMIT_CNT]; /* IOPS limits */ - unsigned int iops[2]; + unsigned int iops[2][LIMIT_CNT]; /* Number of bytes disptached in current slice */ uint64_t bytes_disp[2]; @@ -147,6 +152,8 @@ struct throtl_data /* Work for dispatching throttled bios */ struct work_struct dispatch_work; + unsigned int limit_index; + bool limit_valid[LIMIT_CNT]; }; static void throtl_pending_timer_fn(unsigned long arg); @@ -198,6 +205,16 @@ static struct throtl_data *sq_to_td(struct throtl_service_queue *sq) return container_of(sq, struct throtl_data, service_queue); } +static uint64_t tg_bps_limit(struct throtl_grp *tg, int rw) +{ + return tg->bps[rw][tg->td->limit_index]; +} + +static unsigned int tg_iops_limit(struct throtl_grp *tg, int rw) +{ + return tg->iops[rw][tg->td->limit_index]; +} + /** * throtl_log - log debug message via blktrace * @sq: the service_queue being reported @@ -320,7 +337,7 @@ static void throtl_service_queue_init(struct throtl_service_queue *sq) static struct blkg_policy_data *throtl_pd_alloc(gfp_t gfp, int node) { struct throtl_grp *tg; - int rw; + int rw, index; tg = kzalloc_node(sizeof(*tg), gfp, node); if (!tg) @@ -334,10 +351,12 @@ static struct blkg_policy_data *throtl_pd_alloc(gfp_t gfp, int node) } RB_CLEAR_NODE(&tg->rb_node); - tg->bps[READ] = -1; - tg->bps[WRITE] = -1; - tg->iops[READ] = -1; - tg->iops[WRITE] = -1; + for (rw = READ; rw <= WRITE; rw++) { + for (index = LIMIT_MAX; index < LIMIT_CNT; index++) { + tg->bps[rw][index] = -1; + tg->iops[rw][index] = -1; + } + } return &tg->pd; } @@ -376,11 +395,14 @@ static void throtl_pd_init(struct blkg_policy_data *pd) static void tg_update_has_rules(struct throtl_grp *tg) { struct throtl_grp *parent_tg = sq_to_tg(tg->service_queue.parent_sq); + struct throtl_data *td = tg->td; int rw; for (rw = READ; rw <= WRITE; rw++) tg->has_rules[rw] = (parent_tg && parent_tg->has_rules[rw]) || - (tg->bps[rw] != -1 || tg->iops[rw] != -1); + (td->limit_valid[td->limit_index] && + (tg_bps_limit(tg, rw) != -1 || + tg_iops_limit(tg, rw) != -1)); } static void throtl_pd_online(struct blkg_policy_data *pd) @@ -632,11 +654,11 @@ static inline void throtl_trim_slice(struct throtl_grp *tg, bool rw) if (!nr_slices) return; - tmp = tg->bps[rw] * throtl_slice * nr_slices; + tmp = tg_bps_limit(tg, rw) * throtl_slice * nr_slices; do_div(tmp, HZ); bytes_trim = tmp; - io_trim = (tg->iops[rw] * throtl_slice * nr_slices)/HZ; + io_trim = (tg_iops_limit(tg, rw) * throtl_slice * nr_slices)/HZ; if (!bytes_trim && !io_trim) return; @@ -682,7 +704,7 @@ static bool tg_with_in_iops_limit(struct throtl_grp *tg, struct bio *bio, * have been trimmed. */ - tmp = (u64)tg->iops[rw] * jiffy_elapsed_rnd; + tmp = (u64)tg_iops_limit(tg, rw) * jiffy_elapsed_rnd; do_div(tmp, HZ); if (tmp > UINT_MAX) @@ -697,7 +719,7 @@ static bool tg_with_in_iops_limit(struct throtl_grp *tg, struct bio *bio, } /* Calc approx time to dispatch */ - jiffy_wait = ((tg->io_disp[rw] + 1) * HZ)/tg->iops[rw] + 1; + jiffy_wait = ((tg->io_disp[rw] + 1) * HZ)/tg_iops_limit(tg, rw) + 1; if (jiffy_wait > jiffy_elapsed) jiffy_wait = jiffy_wait - jiffy_elapsed; @@ -724,7 +746,7 @@ static bool tg_with_in_bps_limit(struct throtl_grp *tg, struct bio *bio, jiffy_elapsed_rnd = roundup(jiffy_elapsed_rnd, throtl_slice); - tmp = tg->bps[rw] * jiffy_elapsed_rnd; + tmp = tg_bps_limit(tg, rw) * jiffy_elapsed_rnd; do_div(tmp, HZ); bytes_allowed = tmp; @@ -736,7 +758,7 @@ static bool tg_with_in_bps_limit(struct throtl_grp *tg, struct bio *bio, /* Calc approx time to dispatch */ extra_bytes = tg->bytes_disp[rw] + bio->bi_iter.bi_size - bytes_allowed; - jiffy_wait = div64_u64(extra_bytes * HZ, tg->bps[rw]); + jiffy_wait = div64_u64(extra_bytes * HZ, tg_bps_limit(tg, rw)); if (!jiffy_wait) jiffy_wait = 1; @@ -771,7 +793,7 @@ static bool tg_may_dispatch(struct throtl_grp *tg, struct bio *bio, bio != throtl_peek_queued(&tg->service_queue.queued[rw])); /* If tg->bps = -1, then BW is unlimited */ - if (tg->bps[rw] == -1 && tg->iops[rw] == -1) { + if (tg_bps_limit(tg, rw) == -1 && tg_iops_limit(tg, rw) == -1) { if (wait) *wait = 0; return true; @@ -1148,8 +1170,8 @@ static void tg_conf_updated(struct throtl_grp *tg) throtl_log(&tg->service_queue, "limit change rbps=%llu wbps=%llu riops=%u wiops=%u", - tg->bps[READ], tg->bps[WRITE], - tg->iops[READ], tg->iops[WRITE]); + tg_bps_limit(tg, READ), tg_bps_limit(tg, WRITE), + tg_iops_limit(tg, READ), tg_iops_limit(tg, WRITE)); /* * Update has_rules[] flags for the updated tg's subtree. A tg is @@ -1226,25 +1248,25 @@ static ssize_t tg_set_conf_uint(struct kernfs_open_file *of, static struct cftype throtl_legacy_files[] = { { .name = "throttle.read_bps_device", - .private = offsetof(struct throtl_grp, bps[READ]), + .private = offsetof(struct throtl_grp, bps[READ][LIMIT_MAX]), .seq_show = tg_print_conf_u64, .write = tg_set_conf_u64, }, { .name = "throttle.write_bps_device", - .private = offsetof(struct throtl_grp, bps[WRITE]), + .private = offsetof(struct throtl_grp, bps[WRITE][LIMIT_MAX]), .seq_show = tg_print_conf_u64, .write = tg_set_conf_u64, }, { .name = "throttle.read_iops_device", - .private = offsetof(struct throtl_grp, iops[READ]), + .private = offsetof(struct throtl_grp, iops[READ][LIMIT_MAX]), .seq_show = tg_print_conf_uint, .write = tg_set_conf_uint, }, { .name = "throttle.write_iops_device", - .private = offsetof(struct throtl_grp, iops[WRITE]), + .private = offsetof(struct throtl_grp, iops[WRITE][LIMIT_MAX]), .seq_show = tg_print_conf_uint, .write = tg_set_conf_uint, }, @@ -1270,18 +1292,22 @@ static u64 tg_prfill_max(struct seq_file *sf, struct blkg_policy_data *pd, if (!dname) return 0; - if (tg->bps[READ] == -1 && tg->bps[WRITE] == -1 && - tg->iops[READ] == -1 && tg->iops[WRITE] == -1) + if (tg->bps[READ][LIMIT_MAX] == -1 && tg->bps[WRITE][LIMIT_MAX] == -1 && + tg->iops[READ][LIMIT_MAX] == -1 && tg->iops[WRITE][LIMIT_MAX] == -1) return 0; - if (tg->bps[READ] != -1) - snprintf(bufs[0], sizeof(bufs[0]), "%llu", tg->bps[READ]); - if (tg->bps[WRITE] != -1) - snprintf(bufs[1], sizeof(bufs[1]), "%llu", tg->bps[WRITE]); - if (tg->iops[READ] != -1) - snprintf(bufs[2], sizeof(bufs[2]), "%u", tg->iops[READ]); - if (tg->iops[WRITE] != -1) - snprintf(bufs[3], sizeof(bufs[3]), "%u", tg->iops[WRITE]); + if (tg->bps[READ][LIMIT_MAX] != -1) + snprintf(bufs[0], sizeof(bufs[0]), "%llu", + tg->bps[READ][LIMIT_MAX]); + if (tg->bps[WRITE][LIMIT_MAX] != -1) + snprintf(bufs[1], sizeof(bufs[1]), "%llu", + tg->bps[WRITE][LIMIT_MAX]); + if (tg->iops[READ][LIMIT_MAX] != -1) + snprintf(bufs[2], sizeof(bufs[2]), "%u", + tg->iops[READ][LIMIT_MAX]); + if (tg->iops[WRITE][LIMIT_MAX] != -1) + snprintf(bufs[3], sizeof(bufs[3]), "%u", + tg->iops[WRITE][LIMIT_MAX]); seq_printf(sf, "%s rbps=%s wbps=%s riops=%s wiops=%s\n", dname, bufs[0], bufs[1], bufs[2], bufs[3]); @@ -1310,10 +1336,10 @@ static ssize_t tg_set_max(struct kernfs_open_file *of, tg = blkg_to_tg(ctx.blkg); - v[0] = tg->bps[READ]; - v[1] = tg->bps[WRITE]; - v[2] = tg->iops[READ]; - v[3] = tg->iops[WRITE]; + v[0] = tg->bps[READ][LIMIT_MAX]; + v[1] = tg->bps[WRITE][LIMIT_MAX]; + v[2] = tg->iops[READ][LIMIT_MAX]; + v[3] = tg->iops[WRITE][LIMIT_MAX]; while (true) { char tok[27]; /* wiops=18446744073709551616 */ @@ -1350,10 +1376,10 @@ static ssize_t tg_set_max(struct kernfs_open_file *of, goto out_finish; } - tg->bps[READ] = v[0]; - tg->bps[WRITE] = v[1]; - tg->iops[READ] = v[2]; - tg->iops[WRITE] = v[3]; + tg->bps[READ][LIMIT_MAX] = v[0]; + tg->bps[WRITE][LIMIT_MAX] = v[1]; + tg->iops[READ][LIMIT_MAX] = v[2]; + tg->iops[WRITE][LIMIT_MAX] = v[3]; tg_conf_updated(tg); ret = 0; @@ -1451,8 +1477,8 @@ bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg, /* out-of-limit, queue to @tg */ throtl_log(sq, "[%c] bio. bdisp=%llu sz=%u bps=%llu iodisp=%u iops=%u queued=%d/%d", rw == READ ? 'R' : 'W', - tg->bytes_disp[rw], bio->bi_iter.bi_size, tg->bps[rw], - tg->io_disp[rw], tg->iops[rw], + tg->bytes_disp[rw], bio->bi_iter.bi_size, tg_bps_limit(tg, rw), + tg->io_disp[rw], tg_iops_limit(tg, rw), sq->nr_queued[READ], sq->nr_queued[WRITE]); bio_associate_current(bio); @@ -1563,6 +1589,7 @@ int blk_throtl_init(struct request_queue *q) q->td = td; td->queue = q; + td->limit_valid[LIMIT_MAX] = true; /* activate policy */ ret = blkcg_activate_policy(q, &blkcg_policy_throtl); if (ret)