[Devel] [PATCH RHEL7 COMMIT] block: enable CONFIG_BLK_WBT*

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-1062.1.2.vz7.114.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-1062.1.2.vz7.114.9
------>
commit a2a09d028a2cb4ed04c2ae6bf8d003ccb368b913
Author: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
Date:   Fri Oct 25 13:33:58 2019 +0300

    block: enable CONFIG_BLK_WBT*
    
    https://jira.sw.ru/browse/PSBM-96243
    
    Signed-off-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
    
    =====================
    Patchset description:
    
    block: backport writeback throttling
    
    We have a problem that if we run heavy write load on one cpu
    simultaneousely with short direct reads on other cpu, the latter will
    hang significantly. Writeback throttling looks like a sollution for
    these reads, as it will decrease the priority of long running writeback.
    
    Running simple dd experiment we see that reads latency decreased after
    wbt patches applied:
    https://docs.google.com/spreadsheets/d/1HLtepwFL_N5zm0JcTqMtJoYnf-b6Slwld8DDgL0gNDI
    
    We've ran vconsolidate on custom kernel with these patches, though it
    does not show any performance improvement (likely because this test does
    not produce high rate of writeback), it does not crash or fail the test.
    
    https://jira.sw.ru/browse/PSBM-96243
    
    Jens Axboe (6):
      block: add REQ_BACKGROUND
      writeback: add wbc_to_write_flags()
      writeback: mark background writeback as such
      writeback: track if we're sleeping on progress in
        balance_dirty_pages()
      blk-wbt: add general throttling mechanism
      block: hook up writeback throttling
    
    Omar Sandoval (1):
      block: get rid of struct blk_issue_stat
    
    Pavel Tikhomirov (2):
      x86/asm: remove the unused get_limit() method
      block: enable CONFIG_BLK_WBT*
      blk-wbt: increase maximum queue depth to increase performance of writes
---
 configs/kernel-3.10.0-x86_64-debug.config   | 3 +++
 configs/kernel-3.10.0-x86_64-minimal.config | 3 +++
 configs/kernel-3.10.0-x86_64.config         | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/configs/kernel-3.10.0-x86_64-debug.config b/configs/kernel-3.10.0-x86_64-debug.config
index 9eff1fc3ff17..b11b95b6ce40 100644
--- a/configs/kernel-3.10.0-x86_64-debug.config
+++ b/configs/kernel-3.10.0-x86_64-debug.config
@@ -345,6 +345,9 @@ CONFIG_BLK_DEV_BSGLIB=y
 CONFIG_BLK_DEV_INTEGRITY=y
 CONFIG_BLK_DEV_THROTTLING=y
 CONFIG_BLK_DEBUG_FS=y
+CONFIG_BLK_WBT=y
+CONFIG_BLK_WBT_SQ=y
+CONFIG_BLK_WBT_MQ=y
 
 #
 # Partition Types
diff --git a/configs/kernel-3.10.0-x86_64-minimal.config b/configs/kernel-3.10.0-x86_64-minimal.config
index 464d076e9b7e..0001ceaa59d3 100644
--- a/configs/kernel-3.10.0-x86_64-minimal.config
+++ b/configs/kernel-3.10.0-x86_64-minimal.config
@@ -340,6 +340,9 @@ CONFIG_BLK_DEV_BSGLIB=y
 CONFIG_BLK_DEV_INTEGRITY=y
 CONFIG_BLK_DEV_THROTTLING=y
 CONFIG_BLK_DEBUG_FS=y
+CONFIG_BLK_WBT=y
+CONFIG_BLK_WBT_SQ=y
+CONFIG_BLK_WBT_MQ=y
 
 #
 # Partition Types
diff --git a/configs/kernel-3.10.0-x86_64.config b/configs/kernel-3.10.0-x86_64.config
index edab34be9559..8f79c84cb26a 100644
--- a/configs/kernel-3.10.0-x86_64.config
+++ b/configs/kernel-3.10.0-x86_64.config
@@ -345,6 +345,9 @@ CONFIG_BLK_DEV_BSGLIB=y
 CONFIG_BLK_DEV_INTEGRITY=y
 CONFIG_BLK_DEV_THROTTLING=y
 CONFIG_BLK_DEBUG_FS=y
+CONFIG_BLK_WBT=y
+CONFIG_BLK_WBT_SQ=y
+CONFIG_BLK_WBT_MQ=y
 
 #
 # Partition Types