[Bug 1910976] Re: Cherry-pick dm-crypt performance improvement patch from Linux 5.9

This LP bug is tracking a feature request and as such, I can't provide
logs. I'll therefore change the status to Confirmed.

** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1910976

Title:
Cherry-pick dm-crypt performance improvement patch from Linux 5.9

Status in linux package in Ubuntu:
Confirmed

Bug description:
Hi,

I'm asking if it would be possible to cherry-pick patch "dm crypt: add
flags to optionally bypass kcryptd workqueues" into the 5.4 Ubuntu
kernel. This patch has been merged in mainline kernel 5.9
https://github.com/torvalds/linux/commit/39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877
but was not tagged for the stable tree.

This patch provides important performance gains for some workloads
using dm-crypt / LUKS and cherry-picking it would be very beneficial
for dm-crypt users. You can find details on the expected gain in the
following links:

* https://www.redhat.com/archives/dm-devel/2020-July/msg00138.html
* https://blog.cloudflare.com/speeding-up-linux-disk-encryption/

The patch mostly applies cleanly on the Ubuntu 5.4 kernel, the only
merge conflict is due to the module version at the end of the patch. I
can provide a backport patch if needed.

Thanks,

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