linux-kernel - Re: "statsfs" API design

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Message-ID: <75dc4403-cc07-0f99-00ec-86f61092fff9@redhat.com>
Date:   Tue, 26 Nov 2019 11:50:29 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     KVM list <kvm@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Peter Feiner <pfeiner@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: "statsfs" API design

On 26/11/19 11:09, Greg Kroah-Hartman wrote:
> So I think there are two different things here:
> 	- a simple data structure for in-kernel users of statistics
> 	- a way to export statistics to userspace
> 
> Now if they both can be solved with the same "solution", wonderful!  But
> don't think that you have to do both of these at the same time.
> 
> Which one are you trying to solve here, I can't figure it out.  Is it
> the second one?

I already have the second in KVM using debugfs, but that's not good.  So
I want to do:

- a simple data structure for in-kernel *publishers* of statistics

- a sysfs-based interface to export it to userspace, which looks a lot
like KVM's debugfs-based statistics.

What we don't have to do at the same time, is a new interface to
userspace, one that is more efficient while keeping the self-describing
property that we agree is needed.  That is also planned, but would come
later.

Paolo