linux-kernel - Re: [PATCH v6 05/37] fs: Convert alloc_inode

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Message-Id: <20240321150908.48283ba55a6c786dee273ec3@linux-foundation.org>
Date: Thu, 21 Mar 2024 15:09:08 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: Suren Baghdasaryan <surenb@...gle.com>, mhocko@...e.com, vbabka@...e.cz,
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Subject: Re: [PATCH v6 05/37] fs: Convert alloc_inode_sb() to a macro

On Thu, 21 Mar 2024 17:15:39 -0400 Kent Overstreet <kent.overstreet@...ux.dev> wrote:

> On Thu, Mar 21, 2024 at 01:31:47PM -0700, Andrew Morton wrote:
> > On Thu, 21 Mar 2024 09:36:27 -0700 Suren Baghdasaryan <surenb@...gle.com> wrote:
> > 
> > > From: Kent Overstreet <kent.overstreet@...ux.dev>
> > > 
> > > We're introducing alloc tagging, which tracks memory allocations by
> > > callsite. Converting alloc_inode_sb() to a macro means allocations will
> > > be tracked by its caller, which is a bit more useful.
> > 
> > I'd have thought that there would be many similar
> > inlines-which-allocate-memory.  Such as, I dunno, jbd2_alloc_inode(). 
> > Do we have to go converting things to macros as people report
> > misleading or less useful results, or is there some more general
> > solution to this?
> 
> No, this is just what we have to do.

Well, this is something we strike in other contexts - kallsyms gives us
an inlined function and it's rarely what we wanted.

I think kallsyms has all the data which is needed to fix this - how
hard can it be to figure out that a particular function address lies
within an outer function?  I haven't looked...