From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailout1.samsung.com (mailout1.samsung.com [203.254.224.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 595E81A719 for ; Tue, 26 Dec 2023 04:47:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=samsung.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="i5MLp8QI" Received: from epcas5p2.samsung.com (unknown [182.195.41.40]) by mailout1.samsung.com (KnoxPortal) with ESMTP id 20231226044740epoutp018f29147ea405c822f9122c7c06f8cfa8~kSE54ZFy81135911359epoutp01p for ; Tue, 26 Dec 2023 04:47:40 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout1.samsung.com 20231226044740epoutp018f29147ea405c822f9122c7c06f8cfa8~kSE54ZFy81135911359epoutp01p DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1703566060; bh=Nug3/f8Q4/ibNrOlixZTRYPd3Tv54vqC7fn1zAFy6bQ=; h=From:To:Cc:Subject:Date:References:From; b=i5MLp8QIy3pCNWdGMHVHsUkSYy8Ds6NSv5EbfPsTbNM4pQeX3YdcjHVekRqPK7cPm fROT2x81T9GNGl5j+Rf1ujSyLwqQgQX4dbjrQ9sWASZ62f0d+mDtmrXI1b008hqzwc 16CRbxmqmVZrqhOF/RBQpMilxJGgARimMVCfS23A= Received: from epsnrtp1.localdomain (unknown [182.195.42.162]) by epcas5p2.samsung.com (KnoxPortal) with ESMTP id 20231226044740epcas5p2707bd502c2f1b2753cc5b8a053511ecf~kSE5iDUWR2236222362epcas5p2w; Tue, 26 Dec 2023 04:47:40 +0000 (GMT) Received: from epsmges5p1new.samsung.com (unknown [182.195.38.179]) by epsnrtp1.localdomain (Postfix) with ESMTP id 4Szj1l2K3yz4x9Pv; Tue, 26 Dec 2023 04:47:39 +0000 (GMT) Received: from epcas5p3.samsung.com ( [182.195.41.41]) by epsmges5p1new.samsung.com (Symantec Messaging Gateway) with SMTP id 69.B6.09634.BEA5A856; Tue, 26 Dec 2023 13:47:39 +0900 (KST) Received: from epsmtrp1.samsung.com (unknown [182.195.40.13]) by epcas5p4.samsung.com (KnoxPortal) with ESMTPA id 20231225055252epcas5p43ae8016d329b160f688def7b4f9d4ddb~j-UiUgA7e2655526555epcas5p42; Mon, 25 Dec 2023 05:52:52 +0000 (GMT) Received: from epsmgmc1p1new.samsung.com (unknown [182.195.42.40]) by epsmtrp1.samsung.com (KnoxPortal) with ESMTP id 20231225055252epsmtrp1035a41da09cadae0e41218bbe02795d0~j-UiTlafq3004930049epsmtrp1A; Mon, 25 Dec 2023 05:52:52 +0000 (GMT) X-AuditID: b6c32a49-eebff700000025a2-f8-658a5aebd68e Received: from epsmtip2.samsung.com ( [182.195.34.31]) by epsmgmc1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id A1.A3.07368.4B819856; Mon, 25 Dec 2023 14:52:52 +0900 (KST) Received: from localhost.localdomain (unknown [109.105.118.124]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20231225055250epsmtip2369aa83565ac7aebec79ef864bf5ce60~j-UgepQ100550205502epsmtip2O; Mon, 25 Dec 2023 05:52:50 +0000 (GMT) From: Xiaobing Li To: axboe@kernel.dk Cc: asml.silence@gmail.com, linux-kernel@vger.kernel.org, io-uring@vger.kernel.org, kun.dou@samsung.com, peiwei.li@samsung.com, joshi.k@samsung.com, kundan.kumar@samsung.com, wenwen.chen@samsung.com, ruyi.zhang@samsung.com, cliang01.li@samsung.com, xue01.he@samsung.com, Xiaobing Li Subject: [PATCH v6] io_uring: Statistics of the true utilization of sq threads. Date: Mon, 25 Dec 2023 13:44:38 +0800 Message-ID: <20231225054438.44581-1-xiaobing.li@samsung.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrAJsWRmVeSWpSXmKPExsWy7bCmpu7rqK5Ug4W3+CzmrNrGaLH6bj+b xem/j1ks3rWeY7E4+v8tm8Wv7ruMFlu/fGW1uLxrDpvFs72cFl8Of2e3ODvhA6vF1C07mCw6 Wi4zWnRdOMXmwOexc9Zddo/LZ0s9+rasYvT4vEkugCUq2yYjNTEltUghNS85PyUzL91WyTs4 3jne1MzAUNfQ0sJcSSEvMTfVVsnFJ0DXLTMH6EQlhbLEnFKgUEBicbGSvp1NUX5pSapCRn5x ia1SakFKToFJgV5xYm5xaV66Xl5qiZWhgYGRKVBhQnbGjtUz2QpaFCp6FixgaWC8JtnFyMkh IWAiMfvwS5YuRi4OIYHdjBIbum8yQzifGCVuvZ/ICuF8Y5S42dPLDNNyZW4rVMteRomfZzug qr4ySiz808IKUsUmoC1xfV0XmC0iICyxvwOig1lgD5PE9nsH2UASwgKBEotvdIMVsQioSuya soGpi5GDg1fARuLxFXuIbfISi3csB9vMKyAocXLmExYQmxko3rx1NtRFnRwSvdesIWwXiakb +hghbGGJV8e3sEPYUhIv+9ug7GKJIz3fwY6WEGhglJh++ypUwlri35U9LCA3MAtoSqzfpQ8R lpWYemodE8RePone30+YIOK8EjvmwdiqEqsvPWSBsKUlXjf8hop7SBzY/RgsLiQQK7Hr21L2 CYzys5C8MwvJO7MQNi9gZF7FKJlaUJybnlpsWmCYl1oOj9nk/NxNjOCkquW5g/Hugw96hxiZ OBgPMUpwMCuJ8MoqdqQK8aYkVlalFuXHF5XmpBYfYjQFBvFEZinR5HxgWs8riTc0sTQwMTMz M7E0NjNUEud93To3RUggPbEkNTs1tSC1CKaPiYNTqoHJ/9Hvx6e5MxZKvud+oLiovv589P49 PVc+SXdUBTXq1GW0t0y2PlgZGhZnciT93bFZ3g41r1hr/8xjlMnwOOGvW1XHJpjLKiNxRmym +3HGhFbxD+YeIdX+5/xebrphZs63JIfzq2ai/Gq5RbUb10V1OJWuVb1hs5HPyHHFkz96m/Lv T3FnnXz+vEtF3MlFX15JTXy5uXdvJkt6pfHk6m1inRP9Yo4vmr78arGh3M9bCsbGu5xFk5xz 6s2tj95a1RG0zSTtyr5mW4eKadLPOr/uETFolFHYVDajhiv14BUT+VCLxpVzdmo72RXWX2kR 3rdIUT7jlA1Hsp62YSH3qakGHU9nf3lsvvpq5u5DWkosxRmJhlrMRcWJABzF3WUzBAAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrHLMWRmVeSWpSXmKPExsWy7bCSvO4Wic5Ug8tnWSzmrNrGaLH6bj+b xem/j1ks3rWeY7E4+v8tm8Wv7ruMFlu/fGW1uLxrDpvFs72cFl8Of2e3ODvhA6vF1C07mCw6 Wi4zWnRdOMXmwOexc9Zddo/LZ0s9+rasYvT4vEkugCWKyyYlNSezLLVI3y6BK2PH6plsBS0K FT0LFrA0MF6T7GLk5JAQMJG4MreVBcQWEtjNKDFlqVgXIwdQXFriz59yiBJhiZX/nrN3MXIB lXxmlHi+fzMTSIJNQFvi+rouVhBbBKhofwfEHGaBU0wS7b9cQWxhAX+J3bfugtWzCKhK7Jqy gQlkPq+AjcTjK/YQ8+UlFu9Yzgxi8woISpyc+YQFpIRZQF1i/TwhiInyEs1bZzNPYOSfhaRq FkLVLCRVCxiZVzFKphYU56bnJhsWGOallusVJ+YWl+al6yXn525iBEeBlsYOxnvz/+kdYmTi YDzEKMHBrCTCK6vYkSrEm5JYWZValB9fVJqTWnyIUZqDRUmc13DG7BQhgfTEktTs1NSC1CKY LBMHp1QDE4/wzeN/vt54L7x+dgnvui+BBadjE/iSn0b+FfGqUrpcnH0/csHi5HTR5fuPTPix J6fl9OVdvzivMXjIf1p+/kF/aDxj14aCxE617cue3uwM19ay53kiJbn0x/cJRoETLRx6xAV5 Nu/a9KciyVTfv+qc1bQJLy2jeV1OvA0u+Mzq8silaOJCzTPmm5ecDpdJjVF9qJK2/q9Pw50P NUt/cnyu3+zO9nnT1ZrIVibpmCCrbvvuKxli3GUzDv79MMFJvvGKYpHx5NxXeZ+f6nTZPjhg KWezReOf0ayDL1YZzfVkSpRKOsH472Os18J6jYT53FvP2t7Z8dXX9KXPwbJjXmEc3pbM1ptq Gr9PO/g9UYmlOCPRUIu5qDgRAFG4wlPxAgAA X-CMS-MailID: 20231225055252epcas5p43ae8016d329b160f688def7b4f9d4ddb X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20231225055252epcas5p43ae8016d329b160f688def7b4f9d4ddb References: Count the running time and actual IO processing time of the sqpoll thread, and output the statistical data to fdinfo. Variable description: "work_time" in the code represents the sum of the jiffies of the sq thread actually processing IO, that is, how many milliseconds it actually takes to process IO. "total_time" represents the total time that the sq thread has elapsed from the beginning of the loop to the current time point, that is, how many milliseconds it has spent in total. The test results are as follows: Every 0.5s: cat /proc/23112/fdinfo/6 | grep Sq SqMask: 0x3 SqHead: 1168417 SqTail: 1168418 CachedSqHead: 1168418 SqThread: 23112 SqThreadCpu: 55 SqWorkTime: 12423 SqTotalTime: 12843 changes： v6: - Replace the percentages in the fdinfo output with the actual running time and the time actually processing IO v5： - list the changes in each iteration. v4： - Resubmit the patch based on removing sq->lock v3： - output actual working time as a percentage of total time - detailed description of the meaning of each variable - added test results v2： - output the total statistical time and work time to fdinfo v1： - initial version - Statistics of total time and work time Signed-off-by: Xiaobing Li --- io_uring/fdinfo.c | 6 ++++++ io_uring/sqpoll.c | 8 ++++++++ io_uring/sqpoll.h | 2 ++ 3 files changed, 16 insertions(+) diff --git a/io_uring/fdinfo.c b/io_uring/fdinfo.c index 976e9500f651..82d3d9471bac 100644 --- a/io_uring/fdinfo.c +++ b/io_uring/fdinfo.c @@ -64,6 +64,8 @@ __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f) unsigned int sq_shift = 0; unsigned int sq_entries, cq_entries; int sq_pid = -1, sq_cpu = -1; + unsigned long work_time = 0; + unsigned long total_time = 0; bool has_lock; unsigned int i; @@ -147,10 +149,14 @@ __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f) sq_pid = sq->task_pid; sq_cpu = sq->sq_cpu; + work_time = sq->work_time; + total_time = sq->total_time; } seq_printf(m, "SqThread:\t%d\n", sq_pid); seq_printf(m, "SqThreadCpu:\t%d\n", sq_cpu); + seq_printf(m, "SqWorkTime:\t%lu\n", work_time); + seq_printf(m, "SqTotalTime:\t%lu\n", total_time); seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); for (i = 0; has_lock && i < ctx->nr_user_files; i++) { struct file *f = io_file_from_index(&ctx->file_table, i); diff --git a/io_uring/sqpoll.c b/io_uring/sqpoll.c index 65b5dbe3c850..9b74e344c52a 100644 --- a/io_uring/sqpoll.c +++ b/io_uring/sqpoll.c @@ -225,6 +225,7 @@ static int io_sq_thread(void *data) struct io_ring_ctx *ctx; unsigned long timeout = 0; char buf[TASK_COMM_LEN]; + unsigned long sq_start, sq_work_begin, sq_work_end; DEFINE_WAIT(wait); snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); @@ -241,6 +242,7 @@ static int io_sq_thread(void *data) } mutex_lock(&sqd->lock); + sq_start = jiffies; while (1) { bool cap_entries, sqt_spin = false; @@ -251,6 +253,7 @@ static int io_sq_thread(void *data) } cap_entries = !list_is_singular(&sqd->ctx_list); + sq_work_begin = jiffies; list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { int ret = __io_sq_thread(ctx, cap_entries); @@ -260,6 +263,11 @@ static int io_sq_thread(void *data) if (io_run_task_work()) sqt_spin = true; + sq_work_end = jiffies; + sqd->total_time = sq_work_end - sq_start; + if (sqt_spin == true) + sqd->work_time += sq_work_end - sq_work_begin; + if (sqt_spin || !time_after(jiffies, timeout)) { if (sqt_spin) timeout = jiffies + sqd->sq_thread_idle; diff --git a/io_uring/sqpoll.h b/io_uring/sqpoll.h index 8df37e8c9149..92b4b07220fa 100644 --- a/io_uring/sqpoll.h +++ b/io_uring/sqpoll.h @@ -16,6 +16,8 @@ struct io_sq_data { pid_t task_pid; pid_t task_tgid; + unsigned long work_time; + unsigned long total_time; unsigned long state; struct completion exited; }; -- 2.43.0