From d843634a95a66237f88fa6affa9203c9ee503244 Mon Sep 17 00:00:00 2001 From: Olivier Langlois Date: Mon, 29 Jul 2024 18:38:33 -0400 Subject: [PATCH] io_uring: add napi busy settings to the fdinfo output This info may be useful when attempting to debug a problem involving a ring using the NAPI feature. Here is an example of the output: ip-172-31-39-89 /proc/772/fdinfo # cat 14 pos: 0 flags: 02000002 mnt_id: 16 ino: 10243 SqMask: 0xff SqHead: 633 SqTail: 633 CachedSqHead: 633 CqMask: 0x3fff CqHead: 430250 CqTail: 430250 CachedCqTail: 430250 SQEs: 0 CQEs: 0 SqThread: 885 SqThreadCpu: 0 SqTotalTime: 52793826 SqWorkTime: 3590465 UserFiles: 0 UserBufs: 0 PollList: op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=6, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=6, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 op=10, task_works=0 CqOverflowList: NAPI: enabled napi_busy_poll_to: 1 napi_prefer_busy_poll: true Signed-off-by: Olivier Langlois Reviewed-by: Pavel Begunkov Link: https://lore.kernel.org/r/bb184f8b62703ddd3e6e19eae7ab6c67b97e1e10.1722293317.git.olivier@trillion01.com Signed-off-by: Jens Axboe --- io_uring/fdinfo.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/io_uring/fdinfo.c b/io_uring/fdinfo.c index b1e0e0d85349..d43e1b5fcb36 100644 --- a/io_uring/fdinfo.c +++ b/io_uring/fdinfo.c @@ -221,7 +221,19 @@ __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *file) cqe->user_data, cqe->res, cqe->flags); } - spin_unlock(&ctx->completion_lock); + +#ifdef CONFIG_NET_RX_BUSY_POLL + if (ctx->napi_enabled) { + seq_puts(m, "NAPI:\tenabled\n"); + seq_printf(m, "napi_busy_poll_dt:\t%llu\n", ctx->napi_busy_poll_dt); + if (ctx->napi_prefer_busy_poll) + seq_puts(m, "napi_prefer_busy_poll:\ttrue\n"); + else + seq_puts(m, "napi_prefer_busy_poll:\tfalse\n"); + } else { + seq_puts(m, "NAPI:\tdisabled\n"); + } +#endif } #endif