From: Christoph Lameter <cl@linux.com>
To: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>,
linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Alexander Duyck <alexander.duyck@gmail.com>,
Hannes Frederic Sowa <hannes@stressinduktion.org>
Subject: Re: [PATCH 3/3] slub: build detached freelist with look-ahead
Date: Thu, 23 Jul 2015 09:14:33 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.11.1507230912480.12258@east.gentwo.org> (raw)
In-Reply-To: <20150723130917.6e46e7d0@redhat.com>
On Thu, 23 Jul 2015, Jesper Dangaard Brouer wrote:
> > > I was hoping I could define this per slub runtime. Any chance this
> > > would be made possible?
> >
> > It's not possible to set/reset slab merge in runtime. Once merging
> > happens, one slab could have objects from different kmem_caches so we
> > can't separate it cleanly. Current best approach is to prevent merging
> > when creating new kmem_cache by introducing new slab flag
> > like as SLAB_NO_MERGE.
>
> Yes, the best option would be a new flag (e.g. SLAB_NO_MERGE) when
> creating the kmem_cache.
If this is only in order to stability artificial test loads then the
current kernel parameter is fine afaict. Such a flag has been proposed
numerous times but we never did anything about these requests.
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prev parent reply other threads:[~2015-07-23 14:14 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-15 16:01 [PATCH 0/3] slub: introducing detached freelist Jesper Dangaard Brouer
2015-07-15 16:01 ` [PATCH 1/3] slub: extend slowpath __slab_free() to handle bulk free Jesper Dangaard Brouer
2015-07-15 16:54 ` Christoph Lameter
2015-07-15 16:02 ` [PATCH 2/3] slub: optimize bulk slowpath free by detached freelist Jesper Dangaard Brouer
2015-07-15 16:56 ` Christoph Lameter
2015-07-15 16:02 ` [PATCH 3/3] slub: build detached freelist with look-ahead Jesper Dangaard Brouer
2015-07-16 9:57 ` Jesper Dangaard Brouer
2015-07-20 2:54 ` Joonsoo Kim
2015-07-20 21:28 ` Jesper Dangaard Brouer
2015-07-21 13:50 ` Christoph Lameter
2015-07-21 23:28 ` Jesper Dangaard Brouer
2015-07-23 6:34 ` Joonsoo Kim
2015-07-23 11:09 ` Jesper Dangaard Brouer
2015-07-23 14:14 ` Christoph Lameter [this message]
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