read_stream: Remove obsolete comment.

This comment was describing the v17 implementation (or io_method=sync).

Backpatch-through: 18

diff --git a/src/backend/storage/aio/read_stream.c b/src/backend/storage/aio/read_stream.c
index 031fde9f4cbef1227e33ae5250915621ac158294..6ab2e5a53f449ae295fa793dbe9a59921293294d 100644 (file)
--- a/src/backend/storage/aio/read_stream.c
+++ b/src/backend/storage/aio/read_stream.c
@@ -556,10 +556,9 @@ read_stream_begin_impl(int flags,
        Oid                     tablespace_id;
 
        /*
-        * Decide how many I/Os we will allow to run at the same time.  That
-        * currently means advice to the kernel to tell it that we will soon read.
-        * This number also affects how far we look ahead for opportunities to
-        * start more I/Os.
+        * Decide how many I/Os we will allow to run at the same time.  This
+        * number also affects how far we look ahead for opportunities to start
+        * more I/Os.
         */
        tablespace_id = smgr->smgr_rlocator.locator.spcOid;
        if (!OidIsValid(MyDatabaseId) ||