From: Hao Li <hao.li@linux.dev>
To: Harry Yoo <harry@kernel.org>
Cc: "Vlastimil Babka (SUSE)" <vbabka@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Shakeel Butt <shakeel.butt@linux.dev>,
Alexander Potapenko <glider@google.com>,
Marco Elver <elver@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Lameter <cl@gentwo.org>,
David Rientjes <rientjes@google.com>,
Roman Gushchin <roman.gushchin@linux.dev>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
cgroups@vger.kernel.org
Subject: Re: [PATCH v2 09/13] mm/slab: change struct slabobj_ext to a union
Date: Mon, 27 Jul 2026 14:22:39 +0800 [thread overview]
Message-ID: <amb49FJ_az_3QOPx@fedora> (raw)
In-Reply-To: <89662cae-b3d9-4aa4-a7fa-cf5931781dbc@kernel.org>
On Mon, Jul 27, 2026 at 02:41:20PM +0900, Harry Yoo wrote:
>
>
> On 7/25/26 12:42 AM, Vlastimil Babka (SUSE) wrote:
> > On 7/23/26 11:56, Hao Li wrote:
> >> On Thu, Jul 23, 2026 at 03:27:51PM +0900, Harry Yoo wrote:
> >>>
> >>> and drop OBJEXT_FLAG_UNUSED.
> >>
> >> Yes, this idea is insightful and I think it may need a standalone patch without
> >> blocking current patchset.
> >>
> >>>
> >>> ...not sure how much we care about this on 32bit though.
> >>
> >> Yeah, 32bit is a rare arch today :)
> >
> > Agreed with you both. Let's deal with it later.
>
> Sounds reasonable.
Yes, agree.
>
> > Also AFAICS the memory was already wasted on 32bit prior this series when
> > e.g. CONFIG_MEM_ALLOC_PROFILING was disabled, so there was just 4-byte objcg
> > pointer in 8-byte aligned slabobj_ext, right?
>
> Right.
Exactly.
--
Thanks,
Hao
next prev parent reply other threads:[~2026-07-27 6:22 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-20 14:16 [PATCH v2 00/13] mm/slab, alloc_tag: reduce obj_ext memory waste Vlastimil Babka (SUSE)
2026-07-20 14:16 ` [PATCH v2 01/13] mm/slab: skip kfence objects in allocation profiling Vlastimil Babka (SUSE)
2026-07-21 5:43 ` Harry Yoo
2026-07-21 9:20 ` Vlastimil Babka (SUSE)
2026-07-21 15:41 ` Harry Yoo
2026-07-22 12:47 ` Hao Li
2026-07-24 15:58 ` Vlastimil Babka (SUSE)
2026-07-27 6:21 ` Hao Li
2026-07-20 14:16 ` [PATCH v2 02/13] mm/slub: skip handle_failed_objexts_alloc() with profiling disabled Vlastimil Babka (SUSE)
2026-07-21 5:51 ` Harry Yoo
2026-07-21 9:23 ` Vlastimil Babka (SUSE)
2026-07-20 14:16 ` [PATCH v2 03/13] mm/slab: remove objs_per_slab() Vlastimil Babka (SUSE)
2026-07-21 5:53 ` Harry Yoo
2026-07-23 11:29 ` Hao Li
2026-07-20 14:16 ` [PATCH v2 04/13] mm: move struct slabobj_ext to mm/slab.h Vlastimil Babka (SUSE)
2026-07-21 5:55 ` Harry Yoo
2026-07-23 11:29 ` Hao Li
2026-07-20 14:16 ` [PATCH v2 05/13] mm/slab: make slab_obj_ext() determine object index Vlastimil Babka (SUSE)
2026-07-21 6:02 ` Harry Yoo
2026-07-23 11:30 ` Hao Li
2026-07-20 14:16 ` [PATCH v2 06/13] mm/slab: abstract slabobj_ext.objcg access Vlastimil Babka (SUSE)
2026-07-23 11:32 ` Hao Li
2026-07-23 17:23 ` Suren Baghdasaryan
2026-07-20 14:16 ` [PATCH v2 07/13] mm/slab: abstract slabobj_ext.ref access Vlastimil Babka (SUSE)
2026-07-23 11:32 ` Hao Li
2026-07-20 14:16 ` [PATCH v2 08/13] mm/slab: replace slab.stride with obj_exts_in_object Vlastimil Babka (SUSE)
2026-07-23 11:32 ` Hao Li
2026-07-20 14:16 ` [PATCH v2 09/13] mm/slab: change struct slabobj_ext to a union Vlastimil Babka (SUSE)
2026-07-23 3:05 ` Hao Li
2026-07-23 6:27 ` Harry Yoo
2026-07-23 9:56 ` Hao Li
2026-07-24 15:42 ` Vlastimil Babka (SUSE)
2026-07-27 5:41 ` Harry Yoo
2026-07-27 6:22 ` Hao Li [this message]
2026-07-20 14:16 ` [PATCH v2 10/13] mm/slab: introduce slab_obj_ext_has_codetag() Vlastimil Babka (SUSE)
2026-07-20 14:16 ` [PATCH v2 11/13] mm/slab: reduce slabobj_ext memory with allocation profiling disabled Vlastimil Babka (SUSE)
2026-07-20 14:16 ` [PATCH v2 12/13] mm/slab: add cache_ and slab_needs_objcg() helpers Vlastimil Babka (SUSE)
2026-07-23 9:25 ` Hao Li
2026-07-23 9:30 ` Vlastimil Babka (SUSE)
2026-07-23 10:01 ` Hao Li
2026-07-24 9:41 ` Hao Li
2026-07-24 16:31 ` Vlastimil Babka (SUSE)
2026-07-27 6:17 ` Hao Li
2026-07-24 16:38 ` Vlastimil Babka (SUSE)
2026-07-20 14:16 ` [PATCH v2 13/13] mm/slab: stop allocating objcg pointers when unnecessary Vlastimil Babka (SUSE)
2026-07-24 9:57 ` Hao Li
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