From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751306AbdAODoy (ORCPT ); Sat, 14 Jan 2017 22:44:54 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:59149 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750886AbdAODmi (ORCPT ); Sat, 14 Jan 2017 22:42:38 -0500 Smtp-Origin-Hostprefix: devbig From: Shaohua Li Smtp-Origin-Hostname: devbig638.prn2.facebook.com To: , CC: , , , Smtp-Origin-Cluster: prn2c22 Subject: [PATCH V6 13/18] blk-throttle: add interface to configure idle time threshold Date: Sat, 14 Jan 2017 19:42:30 -0800 Message-ID: <1e7c0d54c9bc716a32d43ef0688ee0ab868e6be7.1484451062.git.shli@fb.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: References: X-FB-Internal: Safe MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-01-15_03:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add interface to configure the threshold. The io.low interface will like: echo "8:16 rbps=2097152 wbps=max idle=2000" > io.low idle is in microsecond unit. Signed-off-by: Shaohua Li --- block/blk-throttle.c | 41 ++++++++++++++++++++++++++++------------- 1 file changed, 28 insertions(+), 13 deletions(-) diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 974ec9d..88c0d1e 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -181,6 +181,8 @@ struct throtl_data unsigned int limit_index; bool limit_valid[LIMIT_CNT]; + unsigned long dft_idletime_threshold; /* us */ + unsigned long low_upgrade_time; unsigned long low_downgrade_time; @@ -477,10 +479,7 @@ static void throtl_pd_init(struct blkg_policy_data *pd) sq->parent_sq = &blkg_to_tg(blkg->parent)->service_queue; tg->td = td; - if (blk_queue_nonrot(td->queue)) - tg->idletime_threshold = DFL_IDLE_THRESHOLD_SSD; - else - tg->idletime_threshold = DFL_IDLE_THRESHOLD_HD; + tg->idletime_threshold = td->dft_idletime_threshold; } /* @@ -1447,6 +1446,7 @@ static u64 tg_prfill_limit(struct seq_file *sf, struct blkg_policy_data *pd, char bufs[4][21] = { "max", "max", "max", "max" }; u64 bps_dft; unsigned int iops_dft; + char idle_time[26] = ""; if (!dname) return 0; @@ -1462,7 +1462,9 @@ static u64 tg_prfill_limit(struct seq_file *sf, struct blkg_policy_data *pd, if (tg->bps_conf[READ][off] == bps_dft && tg->bps_conf[WRITE][off] == bps_dft && tg->iops_conf[READ][off] == iops_dft && - tg->iops_conf[WRITE][off] == iops_dft) + tg->iops_conf[WRITE][off] == iops_dft && + (off != LIMIT_LOW || tg->idletime_threshold == + tg->td->dft_idletime_threshold)) return 0; if (tg->bps_conf[READ][off] != bps_dft) @@ -1477,9 +1479,16 @@ static u64 tg_prfill_limit(struct seq_file *sf, struct blkg_policy_data *pd, if (tg->iops_conf[WRITE][off] != iops_dft) snprintf(bufs[3], sizeof(bufs[3]), "%u", tg->iops_conf[WRITE][off]); + if (off == LIMIT_LOW) { + if (tg->idletime_threshold == ULONG_MAX) + strcpy(idle_time, " idle=max"); + else + snprintf(idle_time, sizeof(idle_time), " idle=%lu", + tg->idletime_threshold); + } - seq_printf(sf, "%s rbps=%s wbps=%s riops=%s wiops=%s\n", - dname, bufs[0], bufs[1], bufs[2], bufs[3]); + seq_printf(sf, "%s rbps=%s wbps=%s riops=%s wiops=%s%s\n", + dname, bufs[0], bufs[1], bufs[2], bufs[3], idle_time); return 0; } @@ -1497,6 +1506,7 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of, struct blkg_conf_ctx ctx; struct throtl_grp *tg; u64 v[4]; + unsigned long idle_time; int ret; int index = of_cft(of)->private; @@ -1511,6 +1521,7 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of, v[2] = tg->iops_conf[READ][index]; v[3] = tg->iops_conf[WRITE][index]; + idle_time = tg->idletime_threshold; while (true) { char tok[27]; /* wiops=18446744073709551616 */ char *p; @@ -1542,6 +1553,8 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of, v[2] = min_t(u64, val, UINT_MAX); else if (!strcmp(tok, "wiops")) v[3] = min_t(u64, val, UINT_MAX); + else if (off == LIMIT_LOW && !strcmp(tok, "idle")) + idle_time = val; else goto out_finish; } @@ -1570,6 +1583,8 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of, blk_throtl_update_limit_valid(tg->td); if (tg->td->limit_valid[LIMIT_LOW]) tg->td->limit_index = LIMIT_LOW; + tg->idletime_threshold = (idle_time == ULONG_MAX) ? + ULONG_MAX : idle_time; } tg_conf_updated(tg); ret = 0; @@ -2114,10 +2129,13 @@ void blk_throtl_register_queue(struct request_queue *q) td = q->td; BUG_ON(!td); - if (blk_queue_nonrot(q)) + if (blk_queue_nonrot(q)) { td->throtl_slice = DFL_THROTL_SLICE_SSD; - else + td->dft_idletime_threshold = DFL_IDLE_THRESHOLD_SSD; + } else { td->throtl_slice = DFL_THROTL_SLICE_HD; + td->dft_idletime_threshold = DFL_IDLE_THRESHOLD_HD; + } /* * some tg are created before queue is fully initialized, eg, nonrot @@ -2127,10 +2145,7 @@ void blk_throtl_register_queue(struct request_queue *q) blkg_for_each_descendant_post(blkg, pos_css, q->root_blkg) { struct throtl_grp *tg = blkg_to_tg(blkg); - if (blk_queue_nonrot(q)) - tg->idletime_threshold = DFL_IDLE_THRESHOLD_SSD; - else - tg->idletime_threshold = DFL_IDLE_THRESHOLD_HD; + tg->idletime_threshold = td->dft_idletime_threshold; } rcu_read_unlock(); } -- 2.9.3