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Date: Wed, 28 Feb 2024 16:51:54 +0800 Message-Id: <20240228085154.193363-1-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+NgFprPJsWRmVeSWpSXmKPExsWy7bCmhq7Dl3upBu0H5SzmrNrGaLH6bj+b xem/j1ks3rWeY7E4+v8tm8Wv7ruMFlu/fGW1uLxrDpvFs72cFl8Of2e3ODvhA6vF1C07mCw6 Wi4zWnRdOMXmwOexc9Zddo/LZ0s9+rasYvT4vEkugCUq2yYjNTEltUghNS85PyUzL91WyTs4 3jne1MzAUNfQ0sJcSSEvMTfVVsnFJ0DXLTMH6EQlhbLEnFKgUEBicbGSvp1NUX5pSapCRn5x ia1SakFKToFJgV5xYm5xaV66Xl5qiZWhgYGRKVBhQnbGydM1Bae0Kyb1bWJuYJyh3MXIySEh YCLRfG0zUxcjF4eQwG5Gib+nLjBDOJ8YJR49OcwKUgXmrDoZCdex7gFUx05GiTvXmtkgnF+M Ep9ezGYCqWIT0Ja4vq4LrFsEyH79eCoLSBGzwBImia3fDoMVCQsESayY3s0MYrMIqEpMO30J rIFXwFai7cFuZoh18hL7D55lhogLSpyc+YQFxGYGijdvnQ12q4RAJ4fE5E8zoBpcJFbvOMAO YQtLvDq+BcqWkvj8bi8bhF0scaTnOytEcwOjxPTbV6GKrCX+XdkDtIEDaIOmxPpd+hBhWYmp p9YxQSzmk+j9/YQJIs4rsWMejK0qsfrSQxYIW1ridcNvqLiHxLGbU9hBRgoJxEosP1owgVF+ FpJ3ZiF5ZxbC4gWMzKsYJVMLinPTU4tNC4zzUsvhEZucn7uJEZxStbx3MD568EHvECMTB+Mh RgkOZiURXhnBu6lCvCmJlVWpRfnxRaU5qcWHGE2BYTyRWUo0OR+Y1PNK4g1NLA1MzMzMTCyN zQyVxHlft85NERJITyxJzU5NLUgtgulj4uCUamBiDnu4+v8t7ZQ2/h+61313316ysLzBzrR0 xeIzfRemGV4w7xc7Hd+074p8injYrBz7rb8nbhbq6bCXt7qsyCnHvSFf7J9fbJpjWa5cdaX4 gncpPDwWHiEWfrVTvndz+XJ/6z62kFdI+7ege42A6YPMJTFei1n5b/Ie3yUiOjPi0mvrYw/t xb9MFrxyIUTjsZzx+Xs/sh9uNPMwWzfz0LI480vP+rgfZs4wWrGJrdfa8vcTs8pZrQfmeS7i Nfq51Yfj+lLf9FMnEhlqnxVK56x6Gvt4Q0tS28R9BlFMp4/tnGmx10v+lf5rB5EJLxfu0Vm5 xLjkQsSBq3Lb9TXDPvQdWJrt8HNVmZr4ZZnAk41KLMUZiYZazEXFiQDdFPU+MgQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrNLMWRmVeSWpSXmKPExsWy7bCSnK7xl3upBtfPaVrMWbWN0WL13X42 i9N/H7NYvGs9x2Jx9P9bNotf3XcZLbZ++cpqcXnXHDaLZ3s5Lb4c/s5ucXbCB1aLqVt2MFl0 tFxmtOi6cIrNgc9j56y77B6Xz5Z69G1ZxejxeZNcAEsUl01Kak5mWWqRvl0CV8bJ0zUFp7Qr JvVtYm5gnKHcxcjJISFgItG87gFTFyMXh5DAdkaJu9tnsHQxcgAlpCX+/CmHqBGWWPnvOTtE zQ9GiUkNvxhBEmwC2hLX13WxgtSLCOhKNN5VAKlhFtjAJLH/6TxWkBphgQCJC3/fs4HYLAKq EtNOXwKL8wrYSrQ92M0MsUBeYv/Bs8wQcUGJkzOfgN3ALKAusX6eEEiYGaikeets5gmM/LOQ VM1CqJqFpGoBI/MqRtHUguLc9NzkAkO94sTc4tK8dL3k/NxNjODw1wrawbhs/V+9Q4xMHIyH GCU4mJVEeGUE76YK8aYkVlalFuXHF5XmpBYfYpTmYFES51XO6UwREkhPLEnNTk0tSC2CyTJx cEo1MOW3yu+rTXVpmr6HUaX6qaxPaXTftQ38Pg3tzxZz+Ike4NnYubclboO4SGbu1vdzWlg7 frDOFNOcFSF1NPb18pKDyUvVf3rcru+bxcXF+X39xz0i7FYeawJPRvtz900XTbjSPPn4iXf7 mXwevNW/ma1zK8vx1XJXbqb+5q8GD2ymzVoe979ZakHe91nvOK3lPi4UPmXp7b75NuM381k3 jj5ZKBH5+5jr0lVeu/gvBFWL3X4h3b2t++Kuk6dvOU+fqvH5w6635yLf1V770/hAf8r+pw2r ly9fa6A2/SDvsfaOOVtjXBW4Fj+5vDUgYR93u4xR8O3ZHSWX58Y8vrF3c8cbNvNFez8HCDYo bPTcvXS+EktxRqKhFnNRcSIA5P7JLu4CAAA= X-CMS-MailID: 20240228085203epcas5p420cb18119eec3559793c2249f3d8727b 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: 20240228085203epcas5p420cb18119eec3559793c2249f3d8727b 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 tool is fio, and its parameters are as follows: [global] ioengine=io_uring direct=1 group_reporting bs=128k norandommap=1 randrepeat=0 refill_buffers ramp_time=30s time_based runtime=1m clocksource=clock_gettime overwrite=1 log_avg_msec=1000 numjobs=1 [disk0] filename=/dev/nvme0n1 rw=read iodepth=16 hipri sqthread_poll=1 The test results are as follows: Every 2.0s: cat /proc/9230/fdinfo/6 | grep -E Sq SqMask: 0x3 SqHead: 3197153 SqTail: 3197153 CachedSqHead: 3197153 SqThread: 9231 SqThreadCpu: 11 SqTotalTime: 18099614 SqWorkTime: 16748316 The test results corresponding to different iodepths are as follows: |-----------|-------|-------|-------|------|-------| | iodepth | 1 | 4 | 8 | 16 | 64 | |-----------|-------|-------|-------|------|-------| |utilization| 2.9% | 8.8% | 10.9% | 92.9%| 84.4% | |-----------|-------|-------|-------|------|-------| | idle | 97.1% | 91.2% | 89.1% | 7.1% | 15.6% | |-----------|-------|-------|-------|------|-------| Signed-off-by: Xiaobing Li --- changes： v10: - Resubmission based on for - 6.9 / io_uring v9: - Modified the encoding format v8: - Get the work time of the sqpoll thread through getrusage v7: - Get the total time of the sqpoll thread through getrusage - The working time of the sqpoll thread is obtained through ktime_get() 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 io_uring/fdinfo.c | 6 ++++++ io_uring/sqpoll.c | 17 ++++++++++++++++- io_uring/sqpoll.h | 1 + 3 files changed, 23 insertions(+), 1 deletion(-) diff --git a/io_uring/fdinfo.c b/io_uring/fdinfo.c index 976e9500f651..42b449e53535 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; + u64 sq_total_time = 0, sq_work_time = 0; bool has_lock; unsigned int i; @@ -147,10 +148,15 @@ __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f) sq_pid = sq->task_pid; sq_cpu = sq->sq_cpu; + getrusage(sq->thread, RUSAGE_SELF, &sq_usage); + sq_total_time = sq_usage.ru_stime.tv_sec * 1000000 + sq_usage.ru_stime.tv_usec; + sq_work_time = sq->work_time; } seq_printf(m, "SqThread:\t%d\n", sq_pid); seq_printf(m, "SqThreadCpu:\t%d\n", sq_cpu); + seq_printf(m, "SqTotalTime:\t%llu\n", sq_total_time); + seq_printf(m, "SqWorkTime:\t%llu\n", sq_work_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 82672eaaee81..363052b4ea76 100644 --- a/io_uring/sqpoll.c +++ b/io_uring/sqpoll.c @@ -253,11 +253,23 @@ static bool io_sq_tw_pending(struct llist_node *retry_list) return retry_list || !llist_empty(&tctx->task_list); } +static void io_sq_update_worktime(struct io_sq_data *sqd, struct rusage *start) +{ + struct rusage end; + + getrusage(current, RUSAGE_SELF, &end); + end.ru_stime.tv_sec -= start->ru_stime.tv_sec; + end.ru_stime.tv_usec -= start->ru_stime.tv_usec; + + sqd->work_time += end.ru_stime.tv_usec + end.ru_stime.tv_sec * 1000000; +} + static int io_sq_thread(void *data) { struct llist_node *retry_list = NULL; struct io_sq_data *sqd = data; struct io_ring_ctx *ctx; + struct rusage start; unsigned long timeout = 0; char buf[TASK_COMM_LEN]; DEFINE_WAIT(wait); @@ -286,6 +298,7 @@ static int io_sq_thread(void *data) } cap_entries = !list_is_singular(&sqd->ctx_list); + getrusage(current, RUSAGE_SELF, &start); list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { int ret = __io_sq_thread(ctx, cap_entries); @@ -296,8 +309,10 @@ static int io_sq_thread(void *data) sqt_spin = true; if (sqt_spin || !time_after(jiffies, timeout)) { - if (sqt_spin) + if (sqt_spin) { + io_sq_update_worktime(sqd, &start); timeout = jiffies + sqd->sq_thread_idle; + } if (unlikely(need_resched())) { mutex_unlock(&sqd->lock); cond_resched(); diff --git a/io_uring/sqpoll.h b/io_uring/sqpoll.h index 8df37e8c9149..4171666b1cf4 100644 --- a/io_uring/sqpoll.h +++ b/io_uring/sqpoll.h @@ -16,6 +16,7 @@ struct io_sq_data { pid_t task_pid; pid_t task_tgid; + u64 work_time; unsigned long state; struct completion exited; }; -- 2.34.1