linux-kernel - Re: [PATCH v2 0/5] slab cleanups

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Message-ID: <YiH/6MeYNaEehXmj@ip-172-31-19-208.ap-northeast-1.compute.internal>
Date:   Fri, 4 Mar 2022 12:02:48 +0000
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     Marco Elver <elver@...gle.com>
Cc:     linux-mm@...ck.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>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew WilCox <willy@...radead.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/5] slab cleanups

On Fri, Mar 04, 2022 at 12:50:21PM +0100, Marco Elver wrote:
> On Fri, 4 Mar 2022 at 07:34, Hyeonggon Yoo <42.hyeyoo@...il.com> wrote:
> >
> > Changes from v1:
> >         Now SLAB passes requests larger than order-1 page
> >         to page allocator.
> >
> >         Adjusted comments from Matthew, Vlastimil, Rientjes.
> >         Thank you for feedback!
> >
> >         BTW, I have no idea what __ksize() should return when an object that
> >         is not allocated from slab is passed. both 0 and folio_size()
> >         seems wrong to me.
> 
> Didn't we say 0 would be the safer of the two options?
> https://lkml.kernel.org/r/0e02416f-ef43-dc8a-9e8e-50ff63dd3c61@suse.cz
>

Oh sorry, I didn't understand why 0 was safer when I was reading it.

Reading again, 0 is safer because kasan does not unpoison for
wrongly passed object, right?

> > Hello, these are cleanup patches for slab.
> > Please consider them for slab-next :)
> >
> > Any comments will be appreciated.
> > Thanks.
> >
> > Hyeonggon Yoo (5):
> >   mm/slab: kmalloc: pass requests larger than order-1 page to page
> >     allocator
> >   mm/sl[au]b: unify __ksize()
> >   mm/sl[auo]b: move definition of __ksize() to mm/slab.h
> >   mm/slub: limit number of node partial slabs only in cache creation
> >   mm/slub: refactor deactivate_slab()
> >
> >  include/linux/slab.h |  36 ++++++------
> >  mm/slab.c            |  51 ++++++++---------
> >  mm/slab.h            |  21 +++++++
> >  mm/slab_common.c     |  20 +++++++
> >  mm/slob.c            |   1 -
> >  mm/slub.c            | 130 ++++++++++++-------------------------------
> >  6 files changed, 114 insertions(+), 145 deletions(-)
> >
> > --
> > 2.33.1
> >

-- 
Thank you, You are awesome!
Hyeonggon :-)