mm: vmscan: make rotations a secondary factor in balancing anon vs file

We noticed a 2% webserver throughput regression after upgrading from 5.6.
This could be tracked down to a shift in the anon/file reclaim balance
(confirmed with swappiness) that resulted in worse reclaim efficiency and
thus more kswapd activity for the same outcome.

The change that exposed the problem is aae466b0052e ("mm/swap: implement
workingset detection for anonymous LRU").  By qualifying swapins based on
their refault distance, it lowered the cost of anon reclaim in this
workload, in turn causing (much) more anon scanning than before.  Scanning
the anon list is more expensive due to the higher ratio of mmapped pages
that may rotate during reclaim, and so the result was an increase in %sys
time.

Right now, rotations aren't considered a cost when balancing scan pressure
between LRUs.  We can end up with very few file refaults putting all the
scan pressure on hot anon pages that are rotated en masse, don't get
reclaimed, and never push back on the file LRU again.  We still only
reclaim file cache in that case, but we burn a lot CPU rotating anon
pages.  It's "fair" from an LRU age POV, but doesn't reflect the real cost
it imposes on the system.

Consider rotations as a secondary factor in balancing the LRUs.  This
doesn't attempt to make a precise comparison between IO cost and CPU cost,
it just says: if reloads are about comparable between the lists, or
rotations are overwhelmingly different, adjust for CPU work.

This fixed the regression on our webservers.  It has since been deployed
to the entire Meta fleet and hasn't caused any problems.

Link: https://lkml.kernel.org/r/20221013193113.726425-1-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@surriel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/swap.h b/include/linux/swap.h
index a18cf4b7c724c05a1a499ea2ac2723ec641cb5b2..369d7799205dd9400e554ae3a756f8b7dad8efb5 100644 (file)
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -384,8 +384,9 @@ extern unsigned long totalreserve_pages;
 
 
 /* linux/mm/swap.c */
-void lru_note_cost(struct lruvec *lruvec, bool file, unsigned int nr_pages);
-void lru_note_cost_folio(struct folio *);
+void lru_note_cost(struct lruvec *lruvec, bool file,
+                  unsigned int nr_io, unsigned int nr_rotated);
+void lru_note_cost_refault(struct folio *);
 void folio_add_lru(struct folio *);
 void folio_add_lru_vma(struct folio *, struct vm_area_struct *);
 void lru_cache_add(struct page *);

diff --git a/mm/swap.c b/mm/swap.c
index 955930f41d20c6d491bb3cf0347086443f16b4c6..2f12a2ee1d3af1f4735a2a658efca841c7031a0e 100644 (file)
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -295,8 +295,20 @@ void folio_rotate_reclaimable(struct folio *folio)
        }
 }
 
-void lru_note_cost(struct lruvec *lruvec, bool file, unsigned int nr_pages)
+void lru_note_cost(struct lruvec *lruvec, bool file,
+                  unsigned int nr_io, unsigned int nr_rotated)
 {
+       unsigned long cost;
+
+       /*
+        * Reflect the relative cost of incurring IO and spending CPU
+        * time on rotations. This doesn't attempt to make a precise
+        * comparison, it just says: if reloads are about comparable
+        * between the LRU lists, or rotations are overwhelmingly
+        * different between them, adjust scan balance for CPU work.
+        */
+       cost = nr_io * SWAP_CLUSTER_MAX + nr_rotated;
+
        do {
                unsigned long lrusize;
 
@@ -310,9 +322,9 @@ void lru_note_cost(struct lruvec *lruvec, bool file, unsigned int nr_pages)
                spin_lock_irq(&lruvec->lru_lock);
                /* Record cost event */
                if (file)
-                       lruvec->file_cost += nr_pages;
+                       lruvec->file_cost += cost;
                else
-                       lruvec->anon_cost += nr_pages;
+                       lruvec->anon_cost += cost;
 
                /*
                 * Decay previous events
@@ -335,10 +347,10 @@ void lru_note_cost(struct lruvec *lruvec, bool file, unsigned int nr_pages)
        } while ((lruvec = parent_lruvec(lruvec)));
 }
 
-void lru_note_cost_folio(struct folio *folio)
+void lru_note_cost_refault(struct folio *folio)
 {
        lru_note_cost(folio_lruvec(folio), folio_is_file_lru(folio),
-                       folio_nr_pages(folio));
+                     folio_nr_pages(folio), 0);
 }
 
 static void folio_activate_fn(struct lruvec *lruvec, struct folio *folio)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 04d8b88e521648752342e3319d3136a02a838a5a..ffe402e095d35676f3811f7e52053af753dc48b3 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2499,7 +2499,7 @@ static unsigned long shrink_inactive_list(unsigned long nr_to_scan,
        __count_vm_events(PGSTEAL_ANON + file, nr_reclaimed);
        spin_unlock_irq(&lruvec->lru_lock);
 
-       lru_note_cost(lruvec, file, stat.nr_pageout);
+       lru_note_cost(lruvec, file, stat.nr_pageout, nr_scanned - nr_reclaimed);
        mem_cgroup_uncharge_list(&folio_list);
        free_unref_page_list(&folio_list);
 
@@ -2639,6 +2639,8 @@ static void shrink_active_list(unsigned long nr_to_scan,
        __mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, -nr_taken);
        spin_unlock_irq(&lruvec->lru_lock);
 
+       if (nr_rotated)
+               lru_note_cost(lruvec, file, 0, nr_rotated);
        mem_cgroup_uncharge_list(&l_active);
        free_unref_page_list(&l_active);
        trace_mm_vmscan_lru_shrink_active(pgdat->node_id, nr_taken, nr_activate,

diff --git a/mm/workingset.c b/mm/workingset.c
index ae7e984b23c6b08e99c25adaf1b8533e623e4c49..d2d02978588cf6231f6dc259e01d04b2987c730d 100644 (file)
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -493,7 +493,7 @@ void workingset_refault(struct folio *folio, void *shadow)
        if (workingset) {
                folio_set_workingset(folio);
                /* XXX: Move to lru_cache_add() when it supports new vs putback */
-               lru_note_cost_folio(folio);
+               lru_note_cost_refault(folio);
                mod_lruvec_state(lruvec, WORKINGSET_RESTORE_BASE + file, nr);
        }
 out: