From: Harry Yoo <harry.yoo@oracle.com>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: "Christoph Lameter (Ampere)" <cl@gentwo.org>,
David Rientjes <rientjes@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
Roman Gushchin <roman.gushchin@linux.dev>,
Shakeel Butt <shakeel.butt@linux.dev>,
Muchun Song <muchun.song@linux.dev>,
Suren Baghdasaryan <surenb@google.com>,
Kent Overstreet <kent.overstreet@linux.dev>,
Andrey Ryabinin <ryabinin.a.a@gmail.com>,
Alexander Potapenko <glider@google.com>,
Andrey Konovalov <andreyknvl@gmail.com>,
Dmitry Vyukov <dvyukov@google.com>,
Yeoreum Yun <yeoreum.yun@arm.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
linux-mm@kvack.org
Subject: Re: [RFC PATCH] mm/slab: save memory by allocating slabobj_ext array from leftover
Date: Wed, 27 Aug 2025 20:40:27 +0900 [thread overview]
Message-ID: <aK7uq2LwIf6g_YGK@hyeyoo> (raw)
In-Reply-To: <c05d3ff6-d668-4317-a5ac-c8943f1bb016@suse.cz>
On Fri, Aug 08, 2025 at 04:44:32PM +0200, Vlastimil Babka wrote:
> On 8/5/25 13:57, Harry Yoo wrote:
> > On Thu, Jun 19, 2025 at 09:56:59AM +0200, Vlastimil Babka wrote:
> >> On 6/13/25 19:47, Harry Yoo wrote:
> >> > On Fri, Jun 13, 2025 at 09:04:34AM -0700, Christoph Lameter (Ampere) wrote:
> >> >> On Fri, 13 Jun 2025, Harry Yoo wrote:
> >> we could have pointer to the 0th slabobj_ext (we
> >> already have) and now also stride (to support the "per-object padding case"
> >
> >> - there's still space in struct slab right?)
> >
> > which space are you referring to, maybe lower 16 bits of page_type?
>
> Ugh I thought counters used only 32bit of 64... so the space exists only for
> 64bit kernels? It would be fine to limit the optimization to those only.
Oh, you're right and it seems to be better than using page_type.
RFC v2 uses page_type but I'll adjust this in V3.
--
Cheers,
Harry / Hyeonggon
prev parent reply other threads:[~2025-08-27 11:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-13 6:33 Harry Yoo
2025-06-13 7:11 ` Harry Yoo
2025-06-13 11:42 ` Yeoreum Yun
2025-06-13 17:58 ` Harry Yoo
2025-06-13 16:04 ` Christoph Lameter (Ampere)
2025-06-13 17:47 ` Harry Yoo
2025-06-16 11:00 ` Harry Yoo
2025-06-19 7:56 ` Vlastimil Babka
2025-08-05 11:57 ` Harry Yoo
2025-08-08 14:44 ` Vlastimil Babka
2025-08-27 11:40 ` Harry Yoo [this message]
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