Re: [PATCH v3 0/7] Statsfs: a new ram-based file system for Linux kernel statistics

Paolo Bonzini
2020-05-27T15:00:57Z

On 27/05/20 15:33, Andrew Lunn wrote:
>> I don't really know a lot about the networking subsystem, and as it was
>> pointed out in another email on patch 7 by Andrew, networking needs to
>> atomically gather and display statistics in order to make them consistent,
>> and currently this is not supported by stats_fs but could be added in
>> future.
>
> Do you have any idea how you will support atomic access? It does not
> seem easy to implement in a filesystem based model.

Hi Andrew,

there are plans to support binary access. Emanuele and I don't really
have a plan for how to implement it, but there are developers from
Google that have ideas (because Google has a similar "metricfs" thing
in-house).

I think atomic access would use some kind of "source_ops" struct
containing create_snapshot and release_snapshot function pointers.

Paolo