Update outdated references to the SLRU ControlLock

SLRU bank locks are referred as "bank locks" or "SLRU bank locks" in the
code comments.  The comments updated in this commit use the latter term.

Oversight in 53c2a97a9266, that has replaced the single ControlLock by
the bank control locks.

Author: Julien Rouhaud <julien.rouhaud@free.fr>
Discussion: https://postgr.es/m/aLUT2UO8RjJOzZNq@jrouhaud
Backpatch-through: 17

diff --git a/src/backend/access/transam/slru.c b/src/backend/access/transam/slru.c
index afedb5c039f167f448564958283ec5dad1040ceb..978d68db0f042ab20b85e3aac757808bc3126bbb 100644 (file)
--- a/src/backend/access/transam/slru.c
+++ b/src/backend/access/transam/slru.c
@@ -401,10 +401,10 @@ SimpleLruZeroPage(SlruCtl ctl, int64 pageno)
    /*
     * Assume this page is now the latest active page.
     *
-    * Note that because both this routine and SlruSelectLRUPage run with
-    * ControlLock held, it is not possible for this to be zeroing a page that
-    * SlruSelectLRUPage is going to evict simultaneously.  Therefore, there's
-    * no memory barrier here.
+    * Note that because both this routine and SlruSelectLRUPage run with a
+    * SLRU bank lock held, it is not possible for this to be zeroing a page
+    * that SlruSelectLRUPage is going to evict simultaneously.  Therefore,
+    * there's no memory barrier here.
     */
    pg_atomic_write_u64(&shared->latest_page_number, pageno);
 

diff --git a/src/include/access/slru.h b/src/include/access/slru.h
index 02fcb3bca5473df7746c00d2b57cf7e3b71cd130..9409f68035a052942c6b19cb53eb677cbe7f3432 100644 (file)
--- a/src/include/access/slru.h
+++ b/src/include/access/slru.h
@@ -55,7 +55,7 @@ typedef enum
 /*
  * Shared-memory state
  *
- * ControlLock is used to protect access to the other fields, except
+ * SLRU bank locks are used to protect access to the other fields, except
  * latest_page_number, which uses atomics; see comment in slru.c.
  */
 typedef struct SlruSharedData