vmscan: add customisable shrinker batch size

For shrinkers that have their own cond_resched* calls, having
shrink_slab break the work down into small batches is not
paticularly efficient. Add a custom batchsize field to the struct
shrinker so that shrinkers can use a larger batch size if they
desire.

A value of zero (uninitialised) means "use the default", so
behaviour is unchanged by this patch.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 6 insertions, 5 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 387422470c95..febbc044e792 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -253,6 +253,8 @@ unsigned long shrink_slab(struct shrink_control *shrink,
                 int shrink_ret = 0;
                 long nr;
                 long new_nr;
+                long batch_size = shrinker->batch ? shrinker->batch
+                                                  : SHRINK_BATCH;
 
                 /*
                  * copy the current shrinker scan count into a local variable
@@ -303,19 +305,18 @@ unsigned long shrink_slab(struct shrink_control *shrink,
                                         nr_pages_scanned, lru_pages,
                                         max_pass, delta, total_scan);
 
-                while (total_scan >= SHRINK_BATCH) {
-                        long this_scan = SHRINK_BATCH;
+                while (total_scan >= batch_size) {
                         int nr_before;
 
                         nr_before = do_shrinker_shrink(shrinker, shrink, 0);
                         shrink_ret = do_shrinker_shrink(shrinker, shrink,
-                                                        this_scan);
+                                                        batch_size);
                         if (shrink_ret == -1)
                                 break;
                         if (shrink_ret < nr_before)
                                 ret += nr_before - shrink_ret;
-                        count_vm_events(SLABS_SCANNED, this_scan);
-                        total_scan -= this_scan;
+                        count_vm_events(SLABS_SCANNED, batch_size);
+                        total_scan -= batch_size;
 
                         cond_resched();
                 }