linux-kernel - Re: [PATCH v3 00/10] tracing: introducing eventfs

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Message-ID: <2FE3777F-4BE0-4F77-B563-3A16BE05B988@vmware.com>
Date:   Thu, 1 Jun 2023 09:07:22 +0000
From:   Ajay Kaher <akaher@...are.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        "mhiramat@...nel.org" <mhiramat@...nel.org>,
        "shuah@...nel.org" <shuah@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-trace-kernel@...r.kernel.org" 
        <linux-trace-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "chinglinyu@...gle.com" <chinglinyu@...gle.com>,
        Nadav Amit <namit@...are.com>,
        "srivatsa@...il.mit.edu" <srivatsa@...il.mit.edu>,
        Alexey Makhalov <amakhalov@...are.com>,
        Vasavi Sirnapalli <vsirnapalli@...are.com>,
        Tapas Kundu <tkundu@...are.com>,
        "er.ajay.kaher@...il.com" <er.ajay.kaher@...il.com>
Subject: Re: [PATCH v3 00/10] tracing: introducing eventfs



> On 01-Jun-2023, at 2:30 PM, 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.
> 
> Tracing events took ~9MB, with this approach it took ~4.5MB
> for ~10K files/dir.
> 

Steve, I have used nested rw-semaphore for eventfs locking (same as in cifs).
As per Amit Nadav, this has to be revisited/reviewed. Please have a look and
share your thoughts.

-Ajay