Eric Lee / smarc-ti-linux-kernel

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Commit 69cb51d18c1ed593009d9a620cac49d0dcf15dc8

Authored by Peter Zijlstra
Committed by Linus Torvalds
1 parent c9e51e4180
Exists in master and in 20 other branches dlt-processor-sdk-linux-03.00.00.04, newt-ti-linux-3.12.y, processor-sdk-linux-01.00.00, processor-sdk-linux-02.00.01, smarc-ti-linux-3.12.10, smarc-ti-linux-3.12.y, smarc-ti-linux-3.14.y, smarc-ti-linux-3.15.y, smarc-ti-lsk-linux-4.1.y, smarct3x-processor-sdk-04.01.00.06, smarct3x-processor-sdk-linux-02.00.01, smarct3x-processor-sdk-linux-03.00.00.04, smarct4x-800-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-04.01.00.06, smarct4x-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-linux-03.00.00.04, ti-linux-3.12.y, ti-linux-3.14.y, ti-linux-3.15.y, ti-lsk-linux-4.1.y

mm: count writeback pages per BDI 

Count per BDI writeback pages.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Showing 2 changed files with 11 additions and 2 deletions Side-by-side Diff

include/linux/backing-dev.h
Diff comments   View file @ 69cb51d
... ... @@ -28,6 +28,7 @@
28 28  
29 29 enum bdi_stat_item {
30 30 BDI_RECLAIMABLE,
  31 + BDI_WRITEBACK,
31 32 NR_BDI_STAT_ITEMS
32 33 };
33 34  
... ... @@ -979,14 +979,18 @@
979 979 int ret;
980 980  
981 981 if (mapping) {
  982 + struct backing_dev_info *bdi = mapping->backing_dev_info;
982 983 unsigned long flags;
983 984  
984 985 write_lock_irqsave(&mapping->tree_lock, flags);
985 986 ret = TestClearPageWriteback(page);
986   - if (ret)
  987 + if (ret) {
987 988 radix_tree_tag_clear(&mapping->page_tree,
988 989 page_index(page),
989 990 PAGECACHE_TAG_WRITEBACK);
  991 + if (bdi_cap_writeback_dirty(bdi))
  992 + __dec_bdi_stat(bdi, BDI_WRITEBACK);
  993 + }
990 994 write_unlock_irqrestore(&mapping->tree_lock, flags);
991 995 } else {
992 996 ret = TestClearPageWriteback(page);
993 997  
994 998  
... ... @@ -1002,14 +1006,18 @@
1002 1006 int ret;
1003 1007  
1004 1008 if (mapping) {
  1009 + struct backing_dev_info *bdi = mapping->backing_dev_info;
1005 1010 unsigned long flags;
1006 1011  
1007 1012 write_lock_irqsave(&mapping->tree_lock, flags);
1008 1013 ret = TestSetPageWriteback(page);
1009   - if (!ret)
  1014 + if (!ret) {
1010 1015 radix_tree_tag_set(&mapping->page_tree,
1011 1016 page_index(page),
1012 1017 PAGECACHE_TAG_WRITEBACK);
  1018 + if (bdi_cap_writeback_dirty(bdi))
  1019 + __inc_bdi_stat(bdi, BDI_WRITEBACK);
  1020 + }
1013 1021 if (!PageDirty(page))
1014 1022 radix_tree_tag_clear(&mapping->page_tree,
1015 1023 page_index(page),