linux-kernel - Re: [RFC v2 83/83] Sysfs support.

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Date:   Thu, 22 Mar 2018 16:00:37 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Andiry Xu <jix024@....ucsd.edu>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvdimm@...ts.01.org, dan.j.williams@...el.com,
        andy.rudoff@...el.com, coughlan@...hat.com, swanson@...ucsd.edu,
        david@...morbit.com, jack@...e.com, swhiteho@...hat.com,
        miklos@...redi.hu, andiry.xu@...il.com,
        Andiry Xu <jix024@...ucsd.edu>
Subject: Re: [RFC v2 83/83] Sysfs support.

On Sat, Mar 10, 2018 at 10:19:04AM -0800, Andiry Xu wrote:
> From: Andiry Xu <jix024@...ucsd.edu>
> 
> Sysfs support allows user to get/post information of running NOVA instance.
> After mount, NOVA creates four entries under proc directory
> /proc/fs/nova/pmem#/:
> 
> timing_stats	IO_stats	allocator	gc
> 
> Show NOVA file operation timing statistics:
> cat /proc/fs/NOVA/pmem#/timing_stats
> 
> Clear timing statistics:
> echo 1 > /proc/fs/NOVA/pmem#/timing_stats
> 
> Show NOVA I/O statistics:
> cat /proc/fs/NOVA/pmem#/IO_stats
> 
> Clear I/O statistics:
> echo 1 > /proc/fs/NOVA/pmem#/IO_stats
> 
> Show NOVA allocator information:
> cat /proc/fs/NOVA/pmem#/allocator
> 
> Manual garbage collection:
> echo #inode_number > /proc/fs/NOVA/pmem#/gc

IIRC no new entries should be added to /proc, /sys is supposed to be
used. I can't find it documented though, so you'd better check with
sysfs people.