From 24dd7610bc886cfd6b387f0c60cc03c8e961c628 Mon Sep 17 00:00:00 2001
From: xiehan <52160700+Barenboim@users.noreply.github.com>
Date: Wed, 15 Jan 2025 20:51:32 +0800
Subject: [PATCH] Decrease max aio events when io_setup() failed. (#1689)

---
 src/manager/WFGlobal.cc | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/manager/WFGlobal.cc b/src/manager/WFGlobal.cc
index dc006edf67f..6f2934a7b9c 100644
--- a/src/manager/WFGlobal.cc
+++ b/src/manager/WFGlobal.cc
@@ -397,10 +397,19 @@ inline IOService *__CommManager::get_io_service()
 		if (!fio_flag_)
 		{
 			int maxevents = WFGlobal::get_global_settings()->fio_max_events;
+			int n = 65536;
 
 			fio_service_ = new __FileIOService(&scheduler_);
-			if (fio_service_->init(maxevents) < 0)
-				abort();
+			while (fio_service_->init(maxevents) < 0)
+			{
+				if ((errno != EAGAIN && errno != EINVAL) || maxevents <= 16)
+					abort();
+
+				while (n >= maxevents)
+					n /= 2;
+
+				maxevents = n;
+			}
 
 			if (fio_service_->bind() < 0)
 				abort();