linux-kernel - Re: [PATCH 5/6] eventfs: get rid of dentry pointers without refcounts

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Date: Tue, 30 Jan 2024 18:04:38 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] eventfs: get rid of dentry pointers without
 refcounts

On Tue, 30 Jan 2024 14:58:26 -0800
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Tue, 30 Jan 2024 at 14:55, Steven Rostedt <rostedt@...dmis.org> wrote:
> >
> > Remember, the files don't have an ei allocated. Only directories.  
> 
> Crossed emails.
> 
> > I then counted the length of the string - 7 bytes (which is the same as the
> > length of the string plus the '\0' character - 8 bytes) to accommodate the
> > pointer size, and it's a savings of 22KB per instance. And in actuality, I
> > should have rounded to the nearest kmalloc slab size as kzalloc() isn't going to
> > return 35 bytes back but 64 bytes will be allocated.  
> 
> No. See my other email. The kmalloc sizes actually means that it comes
> out exactly even.
>

But that wouldn't be the case if I switched over to allocating as its own
slab, as it would make it better condensed.

But, I can keep it your way until I do that, as the biggest savings I
needed was getting rid of all the file meta-data as that was what took up
10s of megabytes.

-- Steve