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From: Christoph Lameter <cl@gentwo.org>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Rustam Kovhaev <rkovhaev@gmail.com>,
	penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com,
	akpm@linux-foundation.org, corbet@lwn.net, djwong@kernel.org,
	david@fromorbit.com, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, linux-doc@vger.kernel.org,
	gregkh@linuxfoundation.org, viro@zeniv.linux.org.uk,
	dvyukov@google.com
Subject: Re: [PATCH v4] slob: add size header to all allocations
Date: Mon, 22 Nov 2021 12:40:53 +0100 (CET)	[thread overview]
Message-ID: <alpine.DEB.2.22.394.2111221239050.205511@gentwo.de> (raw)
In-Reply-To: <148d2774-77b9-bb25-c132-80b00e16ea06@suse.cz>

On Mon, 22 Nov 2021, Vlastimil Babka wrote:

> It's no problem to have the real beginning of the object aligned, and the
> prepended header not. The code already does that before this patch for the
> kmalloc power-of-two alignments, where e.g. the object can be aligned to 256
> bytes, but the prepended header to a smaller ARCH_KMALLOC_MINALIGN /
> ARCH_SLAB_MINALIGN.

Ok but then the first object in a page may still have those issues.

> > I dont know but it seems that making slob that sophisticated is counter
> > productive. Remove SLOB?
>
> I wouldn't mind, but somebody might :)

Well run a space efficiency analysis after this patch. If the memory used
is larger than SLUB (with the configuration for minimal data footprint)
then there is no reason for SLOB to continue.


  reply	other threads:[~2021-11-22 11:40 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-29 21:23 [PATCH] xfs: use kmem_cache_free() for kmem_cache objects Rustam Kovhaev
2021-09-30  4:42 ` Dave Chinner
2021-09-30  8:13   ` Vlastimil Babka
2021-09-30 18:48     ` Rustam Kovhaev
2021-09-30 21:10       ` Vlastimil Babka
2021-10-01  0:32         ` Rustam Kovhaev
2021-10-04  1:07           ` David Rientjes
2021-10-04  1:07             ` David Rientjes
2021-10-12 20:43             ` Darrick J. Wong
2021-10-12 20:43               ` Darrick J. Wong
2021-10-12 21:32                 ` Vlastimil Babka
2021-10-12 23:22                   ` Darrick J. Wong
2021-10-13  7:38                     ` Vlastimil Babka
2021-10-13 16:56                       ` Rustam Kovhaev
2021-10-15  0:57                         ` Darrick J. Wong
2021-10-18  3:38                           ` [PATCH] slob: add size header to all allocations Rustam Kovhaev
2021-10-18  9:22                             ` Vlastimil Babka
2021-10-19  1:22                               ` Rustam Kovhaev
2021-10-20 11:46                             ` Hyeonggon Yoo
2021-10-21 17:36                               ` Vlastimil Babka
2021-10-23  6:41                                 ` [PATCH v2] " Rustam Kovhaev
2021-10-25  9:36                                   ` Vlastimil Babka
2021-10-25 21:49                                     ` Rustam Kovhaev
2021-10-29  3:05                                     ` [PATCH v3] " Rustam Kovhaev
2021-11-16 11:26                                       ` Vlastimil Babka
2021-11-16 23:19                                         ` Rustam Kovhaev
2021-11-22  1:30                                         ` [PATCH v4] " Rustam Kovhaev
2021-11-22  9:22                                           ` Christoph Lameter
2021-11-22  9:40                                             ` Vlastimil Babka
2021-11-22 10:36                                               ` Christoph Lameter
2021-11-22 10:45                                                 ` Vlastimil Babka
2021-11-22 11:40                                                   ` Christoph Lameter [this message]
2021-11-22 11:49                                                     ` Vlastimil Babka
2021-11-23 10:18                                                   ` David Laight
2021-11-30  7:00                                                     ` Rustam Kovhaev
2021-11-30  9:23                                                       ` David Laight
2021-11-30  9:41                                                       ` Christoph Lameter
2021-11-30 14:55                                                     ` Vlastimil Babka
2021-11-30 15:21                                                       ` David Laight
2021-11-30 15:39                                                         ` Vlastimil Babka
2021-11-30 15:26                                                       ` Christoph Lameter
2021-10-24 10:43                                 ` [PATCH] " Hyeonggon Yoo
2021-10-25  8:19                                   ` Vlastimil Babka

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