Re: [PATCH v2 0/6] block: block-status cache for data regions

[Kevin Wolf]

Am 23.06.2021 um 17:01 hat Max Reitz geschrieben:
> Hi,
> 
> See the cover letter from v1 for the general idea:
> 
> https://lists.nongnu.org/archive/html/qemu-block/2021-06/msg00843.html
> 
> 
> The biggest change here in v2 is that instead of having a common CoMutex
> protect the block-status cache, we’re using RCU now.  So to read from
> the cache, or even to invalidate it, no lock is needed, only to update
> it with new data.
> 
> Disclaimer: I have no experience with RCU in practice so far, neither in
> qemu nor anywhere else.  So I hope I’ve used it correctly...

This I hope as well. :-)

With the missing qatomic_rcu_read() added:

Reviewed-by: Kevin Wolf <kwolf@redhat.com>