Hi all,
By commit 428b1d6b, function WritebackContextInit is added but the
comment of this function seems to be incorrect.
*max_coalesce variable doesn't exist at anywhere.
Also, I think it should be fixed that the argument name of this
function does not match function declare in buf_internal.h.
Patch for that attached.
bufmgr.c:L4160
/*
* Initialize a writeback context, discarding potential previous state.
*
* *max_coalesce is a pointer to a variable containing the current maximum
* number of writeback requests that will be coalesced into a bigger one. A
* value <= 0 means that no writeback control will be performed. max_pending
* is a pointer instead of an immediate value, so the coalesce limits can
* easily changed by the GUC mechanism, and so calling code does not have to
* check the current configuration.
*/
void
WritebackContextInit(WritebackContext *context, int *max_pending)
{
Assert(*max_pending <= WRITEBACK_MAX_PENDING_FLUSHES);
context->max_pending = max_pending;
context->nr_pending = 0;
}
buf_internal.h:L303
/*
* Internal routines: only called by bufmgr
* Internal buffer management routines
*/
/* bufmgr.c */
extern void WritebackContextInit(WritebackContext *context, int *max_coalesce);
Regards,
--
Masahiko Sawada
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index a67e518..76ade37 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -4160,12 +4160,10 @@ ts_ckpt_progress_comparator(Datum a, Datum b, void *arg)
/*
* Initialize a writeback context, discarding potential previous state.
*
- * *max_coalesce is a pointer to a variable containing the current maximum
- * number of writeback requests that will be coalesced into a bigger one. A
- * value <= 0 means that no writeback control will be performed. max_pending
- * is a pointer instead of an immediate value, so the coalesce limits can
- * easily changed by the GUC mechanism, and so calling code does not have to
- * check the current configuration.
+ * *max_pending is a pointer instead of an immediate value, so the coalesce
+ * limits can easily changed by the GUC mechanism, and so calling code does
+ * not have to check the current configuration. A value is 0 means that no
+ * writeback control will be performed.
*/
void
WritebackContextInit(WritebackContext *context, int *max_pending)
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h
index 511d740..e0dfb2f 100644
--- a/src/include/storage/buf_internals.h
+++ b/src/include/storage/buf_internals.h
@@ -300,7 +300,7 @@ extern CkptSortItem *CkptBufferIds;
* Internal buffer management routines
*/
/* bufmgr.c */
-extern void WritebackContextInit(WritebackContext *context, int *max_coalesce);
+extern void WritebackContextInit(WritebackContext *context, int *max_pending);
extern void IssuePendingWritebacks(WritebackContext *context);
extern void ScheduleBufferTagForWriteback(WritebackContext *context, BufferTag *tag);
--
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