jolly has uploaded this change for review.

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Add environment variable to set io_uring size

The term "LIBOSMO_IO_URING_INITIAL_SIZE" is related to the following
patch, which will increment the size of the io_uring automatically if
the initial size is too small.

Related: OS#6705
Change-Id: I55289d9282e13aa1bf82f3931c85c196752f1484
---
M src/core/osmo_io_uring.c
1 file changed, 9 insertions(+), 2 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/82/40782/1

diff --git a/src/core/osmo_io_uring.c b/src/core/osmo_io_uring.c
index a9fd441..1817779 100644
--- a/src/core/osmo_io_uring.c
+++ b/src/core/osmo_io_uring.c
@@ -52,15 +52,19 @@
 
 #include "osmo_io_internal.h"
 
-#define IOFD_URING_ENTRIES 4096
+#define IOFD_URING_INITIAL_SIZE 4096
 
 #define OSMO_IO_URING_BATCH "LIBOSMO_IO_URING_BATCH"
 
+#define OSMO_IO_URING_INITIAL_SIZE "LIBOSMO_IO_URING_INITIAL_SIZE"
+
 #define OSMO_IO_URING_READ_SQE "LIBOSMO_IO_URING_READ_SQE"
 
 bool g_io_uring_batch = false;
 bool g_io_uring_submit_needed = false;
 
+static int g_io_uring_size = IOFD_URING_INITIAL_SIZE;
+
 static int g_io_uring_read_sqes = 1;
 
 struct osmo_io_uring {
@@ -103,7 +107,10 @@
 	if ((env = getenv(OSMO_IO_URING_BATCH)))
 		g_io_uring_batch = true;
 
-	rc = io_uring_queue_init(IOFD_URING_ENTRIES, &g_ring.ring, 0);
+	if ((env = getenv(OSMO_IO_URING_INITIAL_SIZE)))
+		g_io_uring_size = atoi(env);
+
+	rc = io_uring_queue_init(g_io_uring_size, &g_ring.ring, 0);
 	if (rc < 0)
 		osmo_panic("failure during io_uring_queue_init(): %s\n", strerror(-rc));
 

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