linux-kernel - Re: [PATCH RFC 2/4] mm, slab: move slab

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Date: Tue, 12 Mar 2024 19:32:57 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Roman Gushchin <roman.gushchin@...ux.dev>
Cc: Vlastimil Babka <vbabka@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Jeff Layton <jlayton@...nel.org>,
	Chuck Lever <chuck.lever@...cle.com>, Kees Cook <kees@...nel.org>,
	Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hyeonggon Yoo <42.hyeyoo@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Shakeel Butt <shakeelb@...gle.com>,
	Muchun Song <muchun.song@...ux.dev>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH RFC 2/4] mm, slab: move slab_memcg hooks to
 mm/memcontrol.c

On Tue, Mar 12, 2024 at 11:56:31AM -0700, Roman Gushchin wrote:
> On Fri, Mar 01, 2024 at 06:07:09PM +0100, Vlastimil Babka wrote:
> > The hooks make multiple calls to functions in mm/memcontrol.c, including
> > to th current_obj_cgroup() marked __always_inline. It might be faster to
> > make a single call to the hook in mm/memcontrol.c instead. The hooks
> > also don't use almost anything from mm/slub.c. obj_full_size() can move
> > with the hooks and cache_vmstat_idx() to the internal mm/slab.h
> > 
> > Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> > ---
> >  mm/memcontrol.c |  90 ++++++++++++++++++++++++++++++++++++++++++++++++++
> >  mm/slab.h       |  10 ++++++
> >  mm/slub.c       | 100 --------------------------------------------------------
> >  3 files changed, 100 insertions(+), 100 deletions(-)
> 
> Reviewed-by: Roman Gushchin <roman.gushchin@...ux.dev>
> 
> Btw, even before your change:
> $ cat mm/memcontrol.c | wc -l
> 8318
> so I wonder if soon we might want to split it into some smaller parts.

If we are going to split it, perhaps a mm/memcg-v1.c would make sense,
because I certainly don't have a good idea about what's v1 and what's
v2.  And maybe we could even conditionally compile the v1 file ;-)