From: David Laight <David.Laight@ACULAB.COM>
To: 'Hyeonggon Yoo' <42.hyeyoo@gmail.com>, Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@gentwo.org>,
Matthew Wilcox <willy@infradead.org>,
Christoph Lameter <cl@gentwo.de>,
Linux Memory Management List <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: RE: Do we really need SLOB nowdays?
Date: Fri, 18 Feb 2022 16:10:28 +0000 [thread overview]
Message-ID: <7829ee15074448d5a7cec1a0e3c352d4@AcuMS.aculab.com> (raw)
In-Reply-To: <Yg9xSWEaTZLA+hYt@ip-172-31-19-208.ap-northeast-1.compute.internal>
From: Hyeonggon Yoo
> Sent: 18 February 2022 10:13
...
> I think SLUB can be memory-efficient as SLOB.
> Is SLOB (Address-Ordered next^Wfirst fit) stronger to fragmentation than SLUB?
Dunno, but I had to patch the vxworks malloc to use 'best fit'
because 'first fit' based on a fifo free list was really horrid.
I can't imagine an address ordered 'first fit' really being that much better.
There are probably a lot more allocs and frees than the kernel used to have.
Also isn't the performance of a 'first fit' going to get horrid
when there are a lot of small items on the free list.
Does SLUB split pages into 3s and 5s (on cache lime boundaries)
as well as powers of 2?
David
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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2022-02-18 16:10 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-17 4:28 [RFC] More deterministic SLOB for real time embedded systems Hyeonggon Yoo
2021-10-17 13:36 ` segregated list + slab merging is much better than original SLOB Hyeonggon Yoo
2021-10-17 13:57 ` Do we really need SLOB nowdays? Hyeonggon Yoo
2021-10-17 14:39 ` Matthew Wilcox
2021-10-18 9:45 ` Hyeonggon Yoo
2021-10-25 8:17 ` Christoph Lameter
2021-10-28 10:04 ` Hyeonggon Yoo
2021-10-28 12:08 ` Matthew Wilcox
2021-10-30 6:12 ` Hyeonggon Yoo
[not found] ` <20211210110835.GA632811@odroid>
2021-12-10 12:06 ` Christoph Lameter
2021-12-14 17:24 ` Vlastimil Babka
[not found] ` <20211215062904.GA1150813@odroid>
2021-12-15 10:10 ` Vlastimil Babka
2021-12-15 15:23 ` Christoph Lameter
2022-02-18 10:13 ` Hyeonggon Yoo
2022-02-18 10:37 ` Hyeonggon Yoo
2022-02-18 16:10 ` David Laight [this message]
2022-02-19 11:59 ` Hyeonggon Yoo
2021-10-25 8:15 ` Christoph Lameter
2021-10-25 8:14 ` [RFC] More deterministic SLOB for real time embedded systems Christoph Lameter
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