From: Hyeonggon Yoo <42.hyeyoo@gmail.com>
To: Rustam Kovhaev <rkovhaev@gmail.com>
Cc: vbabka@suse.cz, cl@linux.com, penberg@kernel.org,
rientjes@google.com, iamjoonsoo.kim@lge.com,
akpm@linux-foundation.org, djwong@kernel.org,
david@fromorbit.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, gregkh@linuxfoundation.org,
viro@zeniv.linux.org.uk, dvyukov@google.com
Subject: Re: [PATCH] slob: add size header to all allocations
Date: Wed, 20 Oct 2021 11:46:38 +0000 [thread overview]
Message-ID: <20211020114638.GA378758@kvm.asia-northeast3-a.c.our-ratio-313919.internal> (raw)
In-Reply-To: <20211018033841.3027515-1-rkovhaev@gmail.com>
On Sun, Oct 17, 2021 at 08:38:41PM -0700, Rustam Kovhaev wrote:
> Let's prepend all allocations of (PAGE_SIZE - align_offset) and less
> with the size header. This way kmem_cache_alloc() memory can be freed
> with kfree() and the other way around, as long as they are less than
> (PAGE_SIZE - align_offset).
Hello Rustam, I measured its impact on memory usage on
tiny kernel configuration as SLOB is used in very small machine.
on x86 32 bit + tinyconfig:
Before:
Slab: 668 kB
After:
Slab: 688~692 kB
it adds 20~24kB.
>
> The main reason for this change is to simplify SLOB a little bit, make
> it a bit easier to debug whenever something goes wrong.
>
It seems acceptable But I wonder it is worth to increase memory usage
to allow freeing kmem_cache_alloc-ed objects by kfree()?
Thanks,
Hyeonggon
> meminfo right after the system boot, without the patch:
> Slab: 35500 kB
>
> the same, with the patch:
> Slab: 36396 kB
>
next prev parent reply other threads:[~2021-10-20 11:46 UTC|newest]
Thread overview: 42+ 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
2021-10-12 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 [this message]
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
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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