mbox series

[SRU,B,F,G,0/1] dm crypt: add flags to optionally

Message ID 20210518025946.744283-1-gerald.yang@canonical.com
Headers show
Series dm crypt: add flags to optionally | expand

Message

Gerald Yang May 18, 2021, 2:59 a.m. UTC 
BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1910976

=== SRU Justification ===
[Impact]
To get better performance for dm-crypt in some cases, bypass kcryptd
workqueue can reduce the overhead in context switch between kworkers,
cherry-pick commit 39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 from mainline
kernel, and bypass kcryptd workqueue is not enabled by default

[Fix]
Add flags to bypass kcryptd workqueue

[Test]
create dm-crypt and setup DM_CRYPT_NO_READ_WORKQUEUE and
DM_CRYPT_NO_WRITE_WORKQUEUE, read/write data and run perf record to see
if read/write to the encrypted device will bypass kcryptd workqueue

[Regression Potential]
Low, this feature is disabled by default, need to enable manually

Ignat Korchagin (1):
  dm crypt: add flags to optionally bypass kcryptd workqueues

 drivers/md/dm-crypt.c | 50 ++++++++++++++++++++++++++++++++++++-------
 1 file changed, 42 insertions(+), 8 deletions(-)