| Message ID | 20240228085154.193363-1-xiaobing.li@samsung.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [v10] io_uring: Statistics of the true utilization of sq threads. | expand |
On 2/28/24 16:51, Xiaobing Li wrote: >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; > }; Sorry, please ignore this patch, I will resend a v10. -- Xiaobing Li
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; };
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 <xiaobing.li@samsung.com> --- 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(-)