1 files changed, 34 insertions, 41 deletions

diff --git a/storage/innobase/include/buf0buf.ic b/storage/innobase/include/buf0buf.ic
index 17064342116..8b1f904a090 100644
--- a/storage/innobase/include/buf0buf.ic
+++ b/storage/innobase/include/buf0buf.ic
@@ -72,9 +72,30 @@ buf_page_peek_if_too_old(
 /*=====================*/
 	const buf_page_t*	bpage)	/*!< in: block to make younger */
 {
-	return(buf_pool->freed_page_clock
-	       >= buf_page_get_freed_page_clock(bpage)
-	       + 1 + (buf_pool->curr_size / 4));
+	if (UNIV_UNLIKELY(buf_pool->freed_page_clock == 0)) {
+		/* If eviction has not started yet, do not update the
+		statistics or move blocks in the LRU list.  This is
+		either the warm-up phase or an in-memory workload. */
+		return(FALSE);
+	} else if (buf_LRU_old_threshold_ms && bpage->old) {
+		unsigned	access_time = buf_page_is_accessed(bpage);
+
+		if (access_time > 0
+		    && (ut_time_ms() - access_time)
+		    >= buf_LRU_old_threshold_ms) {
+			return(TRUE);
+		}
+
+		buf_pool->stat.n_pages_not_made_young++;
+		return(FALSE);
+	} else {
+		/* FIXME: bpage->freed_page_clock is 31 bits */
+		return((buf_pool->freed_page_clock & ((1UL << 31) - 1))
+		       > ((ulint) bpage->freed_page_clock
+			  + (buf_pool->curr_size
+			     * (BUF_LRU_OLD_RATIO_DIV - buf_LRU_old_ratio)
+			     / (BUF_LRU_OLD_RATIO_DIV * 4))));
+	}
 }
 
 /*********************************************************************//**
@@ -118,22 +139,6 @@ buf_pool_get_oldest_modification(void)
 
 	return(lsn);
 }
-
-/*******************************************************************//**
-Increments the buf_pool clock by one and returns its new value. Remember
-that in the 32 bit version the clock wraps around at 4 billion!
-@return	new clock value */
-UNIV_INLINE
-ulint
-buf_pool_clock_tic(void)
-/*====================*/
-{
-	ut_ad(buf_pool_mutex_own());
-
-	buf_pool->ulint_clock++;
-
-	return(buf_pool->ulint_clock);
-}
 #endif /* !UNIV_HOTBACKUP */
 
 /*********************************************************************//**
@@ -280,21 +285,6 @@ buf_page_belongs_to_unzip_LRU(
 }
 
 /*********************************************************************//**
-Determine the approximate LRU list position of a block.
-@return	LRU list position */
-UNIV_INLINE
-ulint
-buf_page_get_LRU_position(
-/*======================*/
-	const buf_page_t*	bpage)	/*!< in: control block */
-{
-	ut_ad(buf_page_in_file(bpage));
-	ut_ad(buf_pool_mutex_own());
-
-	return(bpage->LRU_position);
-}
-
-/*********************************************************************//**
 Gets the mutex of a block.
 @return	pointer to mutex protecting bpage */
 UNIV_INLINE
@@ -487,17 +477,17 @@ buf_page_set_old(
 }
 
 /*********************************************************************//**
-Determine if a block has been accessed in the buffer pool.
-@return	TRUE if accessed */
+Determine the time of first access of a block in the buffer pool.
+@return	ut_time_ms() at the time of first access, 0 if not accessed */
 UNIV_INLINE
-ibool
+unsigned
 buf_page_is_accessed(
 /*=================*/
 	const buf_page_t*	bpage)	/*!< in: control block */
 {
 	ut_ad(buf_page_in_file(bpage));
 
-	return(bpage->accessed);
+	return(bpage->access_time);
 }
 
 /*********************************************************************//**
@@ -507,12 +497,15 @@ void
 buf_page_set_accessed(
 /*==================*/
 	buf_page_t*	bpage,		/*!< in/out: control block */
-	ibool		accessed)	/*!< in: accessed */
+	ulint		time_ms)	/*!< in: ut_time_ms() */
 {
 	ut_a(buf_page_in_file(bpage));
-	ut_ad(mutex_own(buf_page_get_mutex(bpage)));
+	ut_ad(buf_pool_mutex_own());
 
-	bpage->accessed = accessed;
+	if (!bpage->access_time) {
+		/* Make this the time of the first access. */
+		bpage->access_time = time_ms;
+	}
 }
 
 /*********************************************************************//**