Re: [PATCH v11] util-linux: split uuid in separate recipe to allow bootstrapping

On Mon, 2021-03-15 at 10:44 +0000, Luca Boccassi wrote:

On Sun, 2021-03-14 at 22:10 +0000, Richard Purdie wrote:

quoted

On Thu, 2021-03-11 at 15:09 +0000, luca.boccassi@gmail.com wrote:

quoted

From: Luca Boccassi <redacted>

Recently util-linux gained an (optional) build dependency on libcryptsetup.
But libcryptsetup build-depends on util-linux for blkid (optional, can be disabled)
and uuid (mandatory).
Split out util-linux-uuid in a different recipe to break the cycle.

https://github.com/karelzak/util-linux/pull/898

Signed-off-by: Luca Boccassi <redacted>

Unfortunately I noticed we had a performance regression in buildtimes in 
recent changes. The closest I have this narrowed down to so far:

https://autobuilder.yocto.io/pub/non-release/20210314-14/testresults/buildperf-ubuntu1604/perf-ubuntu1604_master_20210314181831_d42487bf52.html

suggests it may be this change. I have more tests queued to confirm
that definitively, if so we'll have to figure out why as this shouldn't
really happen, its an 8% regression :(.

Very strange that a single recipe could do that - is there something
wrong in the new .bb that I missed and could cause this?

I'm wondering if it is because we're building util-linux twice now and
there is some key choke point in the dependency chain. I have no evidence
for that yet, it is just speculation though.

Cheers,

Richard