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logging_file: Request up to 8 iofd write buffers if available

This should help in decreasing latency between submitting a logging line
and getting it written to file. It should, for the same reason, optimize
CPU use.

Change-Id: Ia88b27948922d278e0f72fc2aac4b4ae88465b4d
---
M src/core/logging_file.c
1 file changed, 4 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/90/41990/1

diff --git a/src/core/logging_file.c b/src/core/logging_file.c
index 9c7cf36..067f993 100644
--- a/src/core/logging_file.c
+++ b/src/core/logging_file.c
@@ -253,6 +253,10 @@
 	_log_target_file_setup_talloc_pool(target);
 	osmo_iofd_set_txqueue_max_length(iofd, OSMO_MAX(osmo_iofd_get_txqueue_max_length(iofd), LOG_WQUEUE_LEN));
 
+	/* Request to use 8 write buffers, or less if not as many are available: */
+	rc = osmo_iofd_set_io_buffers(iofd, OSMO_IO_OP_WRITE, 0);
+	rc = osmo_iofd_set_io_buffers(iofd, OSMO_IO_OP_WRITE, OSMO_MIN(rc, 8));
+
 	rc = osmo_iofd_register(iofd, -1);
 	if (rc < 0) {
 		osmo_iofd_free(iofd);

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