Eric Lee / smarc-ti-linux-kernel

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Commit 99b12e3d882bc7ebdfe0de381dff3b16d21c38f7

Authored by Wu Fengguang
Committed by Linus Torvalds
1 parent 48f170fb7d
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

writeback: account NR_WRITTEN at IO completion time 

NR_WRITTEN is now accounted at block IO enqueue time, which is not very
accurate as to common understanding.  This moves NR_WRITTEN accounting to
the IO completion time and makes it more consistent with BDI_WRITTEN,
which is used for bandwidth estimation.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Showing 1 changed file with 3 additions and 2 deletions Side-by-side Diff

... ... @@ -1141,7 +1141,6 @@
1141 1141 void account_page_writeback(struct page *page)
1142 1142 {
1143 1143 inc_zone_page_state(page, NR_WRITEBACK);
1144   - inc_zone_page_state(page, NR_WRITTEN);
1145 1144 }
1146 1145 EXPORT_SYMBOL(account_page_writeback);
1147 1146  
1148 1147  
... ... @@ -1358,8 +1357,10 @@
1358 1357 } else {
1359 1358 ret = TestClearPageWriteback(page);
1360 1359 }
1361   - if (ret)
  1360 + if (ret) {
1362 1361 dec_zone_page_state(page, NR_WRITEBACK);
  1362 + inc_zone_page_state(page, NR_WRITTEN);
  1363 + }
1363 1364 return ret;
1364 1365 }
1365 1366