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

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Date: Thu, 21 Mar 2024 17:15:39 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Suren Baghdasaryan <surenb@...gle.com>, mhocko@...e.com, 
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	Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v6 05/37] fs: Convert alloc_inode_sb() to a macro

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.

But a fair number of these helpers shouldn't exist - jbd2_alloc_inode()
is one of those, it looks like it predates kmalloc() being able to use
the page allocator for large allocations.

> 
> > --- a/include/linux/fs.h
> > +++ b/include/linux/fs.h
> > @@ -3083,11 +3083,7 @@ int setattr_should_drop_sgid(struct mnt_idmap *idmap,
> >   * This must be used for allocating filesystems specific inodes to set
> >   * up the inode reclaim context correctly.
> >   */
> > -static inline void *
> > -alloc_inode_sb(struct super_block *sb, struct kmem_cache *cache, gfp_t gfp)
> > -{
> > -	return kmem_cache_alloc_lru(cache, &sb->s_inode_lru, gfp);
> > -}
> > +#define alloc_inode_sb(_sb, _cache, _gfp) kmem_cache_alloc_lru(_cache, &_sb->s_inode_lru, _gfp)
> 
> Parenthesizing __sb seems sensible here?  

yeah, we can do that