linux-kernel - Re: [PATCH 0/8] tracing: introducing eventfs

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Date:   Tue, 28 Mar 2023 18:47:43 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Ajay Kaher <akaher@...are.com>
Cc:     mhiramat@...nel.org, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, chinglinyu@...gle.com,
        namit@...are.com, srivatsab@...are.com, srivatsa@...il.mit.edu,
        amakhalov@...are.com, vsirnapalli@...are.com, tkundu@...are.com,
        er.ajay.kaher@...il.com
Subject: Re: [PATCH 0/8] tracing: introducing eventfs

On Sun, 22 Jan 2023 22:37:08 +0530
Ajay Kaher <akaher@...are.com> wrote:

> Events Tracing infrastructure contains lot of files, directories
> (internally in terms of inodes, dentries). And ends up by consuming
> memory in MBs. We can have multiple events of Events Tracing, which
> further requires more memory.
> 
> Instead of creating inodes/dentries, eventfs could keep meta-data and
> skip the creation of inodes/dentries. As and when require, eventfs will
> create the inodes/dentries only for required files/directories.
> Also eventfs would delete the inodes/dentries once no more requires
> but preserve the meta data.
> 

Hi Ajay,

Is there going to be any more work on this?

-- Steve

> Tracing events took ~9MB, with this approach it took ~4.5MB
> for ~10K files/dir.
> 
> [PATCH 1/8]: Introducing struct tracefs_inode
> [PATCH 2/8]: Adding eventfs-dir-add functions
> [PATCH 3/8]: Adding eventfs-file-add function
> [PATCH 4/8]: Adding eventfs-file-directory-remove function
> [PATCH 5/8]: Adding functions to create-eventfs-files
> [PATCH 6/8]: Adding eventfs lookup, read, open functions
> [PATCH 7/8]: Creating tracefs_inode_cache
> [PATCH 8/8]: Moving tracing events to eventfs