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(unknown [109.105.118.124]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20231218085948epsmtip15b010f284672e6634ab5e8d943f102bd~h4WwXb-jR0522205222epsmtip1S; Mon, 18 Dec 2023 08:59:48 +0000 (GMT) From: Xiaobing Li To: axboe@kernel.dk, asml.silence@gmail.com Cc: 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 v5] io_uring: Statistics of the true utilization of sq threads. Date: Mon, 18 Dec 2023 16:51:52 +0800 Message-Id: <20231218085152.14720-1-xiaobing.li@samsung.com> X-Mailer: git-send-email 2.34.1 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+NgFprNJsWRmVeSWpSXmKPExsWy7bCmuq4wV0OqQfszNos5q7YxWqy+289m cfrvYxaLd63nWCyO/n/LZvGr+y6jxdYvX1ktLu+aw2bxbC+nxZfD39ktpm7ZwWTR0XKZ0aLr wik2B16PnbPusntcPlvq0bdlFaPH501yASxR2TYZqYkpqUUKqXnJ+SmZeem2St7B8c7xpmYG hrqGlhbmSgp5ibmptkouPgG6bpk5QNcpKZQl5pQChQISi4uV9O1sivJLS1IVMvKLS2yVUgtS cgpMCvSKE3OLS/PS9fJSS6wMDQyMTIEKE7Iz+i9+ZylYrlQx+cMmpgbGT9JdjJwcEgImEtve T2TsYuTiEBLYzSix8vBZFpCEkMAnRonGS7IQiW+MEu/urWeF6fg5ZSsbRGIvo8SKJ1fYITpe MkpMvW0NYrMJaEtcX9cF1iACZL9+PJUFpIFZYAmTxNZvh5lAEsICgRLXJh9hA7FZBFQlbsz5 xwxi8wrYSPw4eIgdYpu8xP6DZ6HighInZz4BO48ZKN68dTYzyFAJgVYOicfb57JANLhIfHn/ ixHCFpZ4dXwL1CApiZf9bVB2scSRnu+sEM0NjBLTb1+FSlhL/LuyB2gQB9AGTYn1u/QhwrIS U0+tY4JYzCfR+/sJE0ScV2LHPBhbVWL1pYdQN0hLvG74DRX3kHj17hM0hGIltr39wDSBUX4W kn9mIflnFsLmBYzMqxglUwuKc9NTi00LjPJSy+Exm5yfu4kRnEq1vHYwPnzwQe8QIxMH4yFG CQ5mJRFel0X1qUK8KYmVValF+fFFpTmpxYcYTYGBPJFZSjQ5H5jM80riDU0sDUzMzMxMLI3N DJXEeV+3zk0REkhPLEnNTk0tSC2C6WPi4JRqYFIvUNOdyNDwsKGwL6nHplnqRNbCefn5cwW2 Biqo7+RMWDP9ZOmSXRPPNPGGfO813iX1Rjjm5+QEVSt7L5mmCVzfL3fydD+z4Ux7IRYgdqp2 5SY7+4wtM4MZI/TOq2RrnDa6dWXDuqyq03P46zWyb4YEXPwrWpagZ/J/ewfT05OetaJz87tW /GpUv9dXprzvxdl14Sn/9GZs2d3PevqBWpQa2/bQazz1NSHSUw9b+HEtW3hisblA9+v4uKbP jI97Trm+P2Yk9mKlOPMZqYSyX6ItsvvL5i3foXGvcJue4WeV/Y4CTmrVtianvQ6VTI7jVDDb eHlz56N4li2nXCUveu7b+/BVgnNLgETAt4W7lViKMxINtZiLihMBhs8any4EAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrJLMWRmVeSWpSXmKPExsWy7bCSnC4bV0OqweTtrBZzVm1jtFh9t5/N 4vTfxywW71rPsVgc/f+WzeJX911Gi61fvrJaXN41h83i2V5Oiy+Hv7NbTN2yg8mio+Uyo0XX hVNsDrweO2fdZfe4fLbUo2/LKkaPz5vkAliiuGxSUnMyy1KL9O0SuDL6L35nKViuVDH5wyam BsZP0l2MnBwSAiYSP6dsZQOxhQR2M0q8OurfxcgBFJeW+POnHKJEWGLlv+fsXYxcQCXPGSU2 3//LBJJgE9CWuL6uixWkXkRAV6LxrgJIDbPABiaJ/U/ngcWFBfwlHm5QASlnEVCVuDHnHzOI zStgI/Hj4CF2iPnyEvsPnoWKC0qcnPmEBaSVWUBdYv08IZAwM1BJ89bZzBMY+WchqZqFUDUL SdUCRuZVjJKpBcW56bnJhgWGeanlesWJucWleel6yfm5mxjBoa+lsYPx3vx/eocYmTgYDzFK cDArifC6LKpPFeJNSaysSi3Kjy8qzUktPsQozcGiJM5rOGN2ipBAemJJanZqakFqEUyWiYNT qoFJo7to74WSr9ObXQICLdMsDYx9d559eMCxRpPtgPBdjyfC6qIzF+jOWj372IRNS9acXZbB s/W3yOm9C1QSZ/f/4dJy63lYquzVzbfKSs3eqiNB8FxesFjp77daLsFf2lgXhLyapbNCZLr3 0p7HjovDqswqdv6yneP/l4Gn+0HsmbPRjVeOz+k8fuXjrgRB1zX7HFsCay4Vf73YWXb16g7T eQfTnb37Df4y9ui8ZNgh9bM9cVL/nYheg7C6ZqH7DE82GS949pJp0aSHDqG+/jv8L03PyX7F eDJp0Y/LJ5oTZuq2Kt6f+PNbb/6iwjs/Hd497Gd87nPjyby5votu/xQoLQqSer3o9ulf0yvn 2EW7KrEUZyQaajEXFScCAOjmTizsAgAA X-CMS-MailID: 20231218085950epcas5p4171efba84d8c14bf1307aa16c48414ca 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: 20231218085950epcas5p4171efba84d8c14bf1307aa16c48414ca References: The running time of the sq thread and the actual IO processing time are counted, and the proportion of time actually used to process IO is output as a percentage. 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 output "SqBusy" represents the percentage of time utilization that the sq thread actually uses to process IO. 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 SqBusy: 97% changes： v5： - list the changes in each iteration. v4： - Resubmit the patch based on removing sq->lock - https://lore.kernel.org/io-uring/20231213032513.12591-1-xiaobing.li@samsung.com/T/#u v3： - output actual working time as a percentage of total time - detailed description of the meaning of each variable - added test results - https://lore.kernel.org/io-uring/50ec567f-6b79-42ea-bf2c-2c9b2ecb427d@suswa.mountain/T/#t v2： - output the total statistical time and work time to fdinfo - https://lore.kernel.org/io-uring/9e2b679c-fc1e-3d83-2303-e053f330a21a@gmail.com/T/#t v1： - initial version - Statistics of total time and work time - https://lore.kernel.org/io-uring/2a1bdb5a-1216-45b0-a78d-5542b36ccd17@kernel.dk/T/#t Signed-off-by: Xiaobing Li --- io_uring/fdinfo.c | 4 ++++ io_uring/sqpoll.c | 8 ++++++++ io_uring/sqpoll.h | 2 ++ 3 files changed, 14 insertions(+) diff --git a/io_uring/fdinfo.c b/io_uring/fdinfo.c index 976e9500f651..b0f9d296c5aa 100644 --- a/io_uring/fdinfo.c +++ b/io_uring/fdinfo.c @@ -64,6 +64,7 @@ __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; + int sq_busy = 0; bool has_lock; unsigned int i; @@ -147,10 +148,13 @@ __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f) sq_pid = sq->task_pid; sq_cpu = sq->sq_cpu; + if (sq->total_time != 0) + sq_busy = (int)(sq->work_time * 100 / sq->total_time); } seq_printf(m, "SqThread:\t%d\n", sq_pid); seq_printf(m, "SqThreadCpu:\t%d\n", sq_cpu); + seq_printf(m, "SqBusy:\t%d%%\n", sq_busy); 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; }; -- 2.34.1