From: Isaac Manjarres <isaacmanjarres@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
Herbert Xu <herbert@gondor.apana.org.au>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
Ard Biesheuvel <ardb@kernel.org>, Will Deacon <will@kernel.org>,
Marc Zyngier <maz@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Saravana Kannan <saravanak@google.com>,
kernel-team@android.com
Subject: Re: [PATCH 07/10] crypto: Use ARCH_DMA_MINALIGN instead of ARCH_KMALLOC_MINALIGN
Date: Fri, 15 Jul 2022 15:23:25 -0700 [thread overview]
Message-ID: <YtHo3Xu33jovwpFt@google.com> (raw)
In-Reply-To: <YlxATW56ZoNtmxlk@arm.com>
On Sun, Apr 17, 2022 at 05:29:01PM +0100, Catalin Marinas wrote:
> On Sun, Apr 17, 2022 at 04:43:33PM +0800, Herbert Xu wrote:
> > On Sun, Apr 17, 2022 at 09:38:40AM +0100, Catalin Marinas wrote:
> > > I don't think we need to do anything here. A structure like:
> > >
> > > struct x {
> > > char y;
> > > char z[] CRYPTO_MINALIGN_ATTR;
> > > };
> > >
> > > is already of size 128. Without CRYPTO_MINALIGN_ATTR, its size would be
> > > 1 but otherwise the whole structure inherits the alignment of its
> > > member and this translates into an aligned size.
> >
> > No we should not lie to the compiler,
>
> We won't if we ensure that a structure with sizeof() >= 128 is aligned
> to 128.
>
Right. kmalloc() should return a 128 byte aligned pointer as long as
the size of the allocation is >= 128 bytes, and the kmalloc-192 cache
isn't present. So, the current behavior that crypto is relying on
wouldn't change, so I agree with Catalin that we wouldn't be lying to
the compiler if we move forward with getting rid of kmalloc-192.
FWIW, I did a comparison on my machine with and without kmalloc-192, and
the amount of memory usage that increased from allocations being redirected to
kmalloc-256 was about 0.4-0.5 MB, which doesn't seem too bad.
> > we have code elsewhere
> > that uses the alignment to compute the amount of extra padding
> > needed to create greater padding. If CRYPTO_MINALIGN is misleading
> > then that calculation will fall apart.
I don't think it would be misleading. If all of your allocations
are >= CRYPTO_MINALIGN == ARCH_DMA_MINALIGN in size, and
kmalloc()--with kmalloc-192 removed--returns buffers that are aligned to a
power of 2, and are big enough to accomodate your allocation, then wouldn't
they always be CYRPTO_MINALIGN'ed, so your calculation would still be fine?
--Isaac
WARNING: multiple messages have this Message-ID (diff)
From: Isaac Manjarres <isaacmanjarres@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
Herbert Xu <herbert@gondor.apana.org.au>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
Ard Biesheuvel <ardb@kernel.org>, Will Deacon <will@kernel.org>,
Marc Zyngier <maz@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Saravana Kannan <saravanak@google.com>,
kernel-team@android.com
Subject: Re: [PATCH 07/10] crypto: Use ARCH_DMA_MINALIGN instead of ARCH_KMALLOC_MINALIGN
Date: Fri, 15 Jul 2022 15:23:25 -0700 [thread overview]
Message-ID: <YtHo3Xu33jovwpFt@google.com> (raw)
In-Reply-To: <YlxATW56ZoNtmxlk@arm.com>
On Sun, Apr 17, 2022 at 05:29:01PM +0100, Catalin Marinas wrote:
> On Sun, Apr 17, 2022 at 04:43:33PM +0800, Herbert Xu wrote:
> > On Sun, Apr 17, 2022 at 09:38:40AM +0100, Catalin Marinas wrote:
> > > I don't think we need to do anything here. A structure like:
> > >
> > > struct x {
> > > char y;
> > > char z[] CRYPTO_MINALIGN_ATTR;
> > > };
> > >
> > > is already of size 128. Without CRYPTO_MINALIGN_ATTR, its size would be
> > > 1 but otherwise the whole structure inherits the alignment of its
> > > member and this translates into an aligned size.
> >
> > No we should not lie to the compiler,
>
> We won't if we ensure that a structure with sizeof() >= 128 is aligned
> to 128.
>
Right. kmalloc() should return a 128 byte aligned pointer as long as
the size of the allocation is >= 128 bytes, and the kmalloc-192 cache
isn't present. So, the current behavior that crypto is relying on
wouldn't change, so I agree with Catalin that we wouldn't be lying to
the compiler if we move forward with getting rid of kmalloc-192.
FWIW, I did a comparison on my machine with and without kmalloc-192, and
the amount of memory usage that increased from allocations being redirected to
kmalloc-256 was about 0.4-0.5 MB, which doesn't seem too bad.
> > we have code elsewhere
> > that uses the alignment to compute the amount of extra padding
> > needed to create greater padding. If CRYPTO_MINALIGN is misleading
> > then that calculation will fall apart.
I don't think it would be misleading. If all of your allocations
are >= CRYPTO_MINALIGN == ARCH_DMA_MINALIGN in size, and
kmalloc()--with kmalloc-192 removed--returns buffers that are aligned to a
power of 2, and are big enough to accomodate your allocation, then wouldn't
they always be CYRPTO_MINALIGN'ed, so your calculation would still be fine?
--Isaac
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-07-15 22:23 UTC|newest]
Thread overview: 287+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-05 13:57 [PATCH 00/10] mm, arm64: Reduce ARCH_KMALLOC_MINALIGN below the cache line size Catalin Marinas
2022-04-05 13:57 ` Catalin Marinas
2022-04-05 13:57 ` [PATCH 01/10] mm/slab: Decouple ARCH_KMALLOC_MINALIGN from ARCH_DMA_MINALIGN Catalin Marinas
2022-04-05 13:57 ` Catalin Marinas
2022-04-05 23:59 ` Hyeonggon Yoo
2022-04-05 23:59 ` Hyeonggon Yoo
2022-04-06 7:29 ` Arnd Bergmann
2022-04-06 7:29 ` Arnd Bergmann
2022-04-06 12:09 ` Hyeonggon Yoo
2022-04-06 12:09 ` Hyeonggon Yoo
2022-04-06 8:53 ` Catalin Marinas
2022-04-06 8:53 ` Catalin Marinas
2022-04-06 2:01 ` kernel test robot
2022-04-06 8:56 ` Catalin Marinas
2022-04-06 8:56 ` Catalin Marinas
2022-04-06 12:18 ` [kbuild-all] " Chen, Rong A
2022-04-08 6:42 ` Hyeonggon Yoo
2022-04-08 6:42 ` Hyeonggon Yoo
2022-04-08 9:06 ` Hyeonggon Yoo
2022-04-08 9:06 ` Hyeonggon Yoo
2022-04-08 9:11 ` Catalin Marinas
2022-04-08 9:11 ` Catalin Marinas
2022-04-11 10:37 ` Hyeonggon Yoo
2022-04-11 10:37 ` Hyeonggon Yoo
2022-04-11 14:02 ` Catalin Marinas
2022-04-11 14:02 ` Catalin Marinas
2022-04-05 13:57 ` [PATCH 02/10] drivers/base: Use ARCH_DMA_MINALIGN instead of ARCH_KMALLOC_MINALIGN Catalin Marinas
2022-04-05 13:57 ` Catalin Marinas
2022-04-11 14:57 ` Andy Shevchenko
2022-04-11 14:57 ` Andy Shevchenko
2022-04-11 17:39 ` Catalin Marinas
2022-04-11 17:39 ` Catalin Marinas
2022-04-05 13:57 ` [PATCH 03/10] drivers/gpu: " Catalin Marinas
2022-04-05 13:57 ` Catalin Marinas
2022-04-05 13:57 ` [PATCH 04/10] drivers/md: " Catalin Marinas
2022-04-05 13:57 ` Catalin Marinas
2022-04-05 13:57 ` [PATCH 05/10] drivers/spi: " Catalin Marinas
2022-04-05 13:57 ` Catalin Marinas
2022-04-05 14:05 ` Mark Brown
2022-04-05 14:05 ` Mark Brown
2022-04-05 13:57 ` [PATCH 06/10] drivers/usb: " Catalin Marinas
2022-04-05 13:57 ` Catalin Marinas
2022-04-05 13:57 ` [PATCH 07/10] crypto: " Catalin Marinas
2022-04-05 13:57 ` Catalin Marinas
2022-04-05 22:57 ` Herbert Xu
2022-04-05 22:57 ` Herbert Xu
2022-04-06 6:53 ` Ard Biesheuvel
2022-04-06 6:53 ` Ard Biesheuvel
2022-04-06 8:49 ` Catalin Marinas
2022-04-06 8:49 ` Catalin Marinas
2022-04-06 9:41 ` Ard Biesheuvel
2022-04-06 9:41 ` Ard Biesheuvel
2022-04-07 4:30 ` Herbert Xu
2022-04-07 4:30 ` Herbert Xu
2022-04-07 11:01 ` Catalin Marinas
2022-04-07 11:01 ` Catalin Marinas
2022-04-07 11:40 ` Herbert Xu
2022-04-07 11:40 ` Herbert Xu
2022-04-07 16:28 ` Catalin Marinas
2022-04-07 16:28 ` Catalin Marinas
2022-04-08 3:25 ` Herbert Xu
2022-04-08 3:25 ` Herbert Xu
2022-04-08 9:04 ` Catalin Marinas
2022-04-08 9:04 ` Catalin Marinas
2022-04-08 9:11 ` Herbert Xu
2022-04-08 9:11 ` Herbert Xu
2022-04-12 9:32 ` Catalin Marinas
2022-04-12 9:32 ` Catalin Marinas
2022-04-12 9:40 ` Herbert Xu
2022-04-12 9:40 ` Herbert Xu
2022-04-12 10:02 ` Catalin Marinas
2022-04-12 10:02 ` Catalin Marinas
2022-04-12 10:18 ` Herbert Xu
2022-04-12 10:18 ` Herbert Xu
2022-04-12 12:31 ` Catalin Marinas
2022-04-12 12:31 ` Catalin Marinas
2022-04-12 22:01 ` Ard Biesheuvel
2022-04-12 22:01 ` Ard Biesheuvel
2022-04-13 8:47 ` Catalin Marinas
2022-04-13 8:47 ` Catalin Marinas
2022-04-13 19:53 ` Linus Torvalds
2022-04-13 19:53 ` Linus Torvalds
2022-04-14 5:38 ` Greg Kroah-Hartman
2022-04-14 5:38 ` Greg Kroah-Hartman
2022-04-14 13:52 ` Ard Biesheuvel
2022-04-14 13:52 ` Ard Biesheuvel
2022-04-14 14:27 ` Greg Kroah-Hartman
2022-04-14 14:27 ` Greg Kroah-Hartman
2022-04-14 14:36 ` Ard Biesheuvel
2022-04-14 14:36 ` Ard Biesheuvel
2022-04-14 14:52 ` Greg Kroah-Hartman
2022-04-14 14:52 ` Greg Kroah-Hartman
2022-04-14 15:01 ` Ard Biesheuvel
2022-04-14 15:01 ` Ard Biesheuvel
2022-04-14 15:10 ` Ard Biesheuvel
2022-04-14 15:10 ` Ard Biesheuvel
2022-04-14 19:49 ` Catalin Marinas
2022-04-14 19:49 ` Catalin Marinas
2022-04-14 22:25 ` Linus Torvalds
2022-04-14 22:25 ` Linus Torvalds
2022-04-15 6:03 ` Ard Biesheuvel
2022-04-15 6:03 ` Ard Biesheuvel
2022-04-15 11:09 ` Arnd Bergmann
2022-04-15 11:09 ` Arnd Bergmann
2022-04-16 9:42 ` Catalin Marinas
2022-04-16 9:42 ` Catalin Marinas
2022-04-20 19:07 ` Catalin Marinas
2022-04-20 19:07 ` Catalin Marinas
2022-04-20 19:33 ` Linus Torvalds
2022-04-20 19:33 ` Linus Torvalds
2022-04-14 14:30 ` Ard Biesheuvel
2022-04-14 14:30 ` Ard Biesheuvel
2022-04-15 6:51 ` Herbert Xu
2022-04-15 6:51 ` Herbert Xu
2022-04-15 7:49 ` Ard Biesheuvel
2022-04-15 7:49 ` Ard Biesheuvel
2022-04-15 7:51 ` Herbert Xu
2022-04-15 7:51 ` Herbert Xu
2022-04-15 8:05 ` Ard Biesheuvel
2022-04-15 8:05 ` Ard Biesheuvel
2022-04-15 8:12 ` Herbert Xu
2022-04-15 8:12 ` Herbert Xu
2022-04-15 9:51 ` Ard Biesheuvel
2022-04-15 9:51 ` Ard Biesheuvel
2022-04-15 10:04 ` Ard Biesheuvel
2022-04-15 10:04 ` Ard Biesheuvel
2022-04-15 10:12 ` Herbert Xu
2022-04-15 10:12 ` Herbert Xu
2022-04-15 10:22 ` Ard Biesheuvel
2022-04-15 10:22 ` Ard Biesheuvel
2022-04-15 10:45 ` Herbert Xu
2022-04-15 10:45 ` Herbert Xu
2022-04-15 11:38 ` Ard Biesheuvel
2022-04-15 11:38 ` Ard Biesheuvel
2022-04-17 8:08 ` Herbert Xu
2022-04-17 8:08 ` Herbert Xu
2022-04-17 8:31 ` Catalin Marinas
2022-04-17 8:31 ` Catalin Marinas
2022-04-17 8:35 ` Herbert Xu
2022-04-17 8:35 ` Herbert Xu
2022-04-17 8:50 ` Catalin Marinas
2022-04-17 8:50 ` Catalin Marinas
2022-04-17 8:58 ` Herbert Xu
2022-04-17 8:58 ` Herbert Xu
2022-04-17 16:30 ` Catalin Marinas
2022-04-17 16:30 ` Catalin Marinas
2022-04-18 8:37 ` Herbert Xu
2022-04-18 8:37 ` Herbert Xu
2022-04-18 9:19 ` Catalin Marinas
2022-04-18 9:19 ` Catalin Marinas
2022-04-18 16:44 ` Catalin Marinas
2022-04-18 16:44 ` Catalin Marinas
2022-04-19 21:50 ` Ard Biesheuvel
2022-04-19 21:50 ` Ard Biesheuvel
2022-04-20 10:36 ` Catalin Marinas
2022-04-20 10:36 ` Catalin Marinas
2022-04-20 11:29 ` Arnd Bergmann
2022-04-20 11:29 ` Arnd Bergmann
2022-04-21 7:20 ` Christoph Hellwig
2022-04-21 7:20 ` Christoph Hellwig
2022-04-21 7:36 ` Arnd Bergmann
2022-04-21 7:36 ` Arnd Bergmann
2022-04-21 7:44 ` Christoph Hellwig
2022-04-21 7:44 ` Christoph Hellwig
2022-04-21 8:05 ` Ard Biesheuvel
2022-04-21 8:05 ` Ard Biesheuvel
2022-04-21 11:06 ` Catalin Marinas
2022-04-21 11:06 ` Catalin Marinas
2022-04-21 12:28 ` Arnd Bergmann
2022-04-21 12:28 ` Arnd Bergmann
2022-04-21 13:25 ` Catalin Marinas
2022-04-21 13:25 ` Catalin Marinas
2022-04-21 13:47 ` Arnd Bergmann
2022-04-21 13:47 ` Arnd Bergmann
2022-04-21 14:44 ` Catalin Marinas
2022-04-21 14:44 ` Catalin Marinas
2022-04-21 14:47 ` Arnd Bergmann
2022-04-21 14:47 ` Arnd Bergmann
2022-05-10 11:03 ` [RFC PATCH 0/7] crypto: Add helpers for allocating with DMA alignment Herbert Xu
2022-05-10 11:03 ` Herbert Xu
2022-05-10 11:07 ` [RFC PATCH 1/7] crypto: Prepare to move crypto_tfm_ctx Herbert Xu
2022-05-10 11:07 ` Herbert Xu
2022-05-10 11:07 ` [RFC PATCH 2/7] crypto: api - Add crypto_tfm_ctx_dma Herbert Xu
2022-05-10 11:07 ` Herbert Xu
2022-05-10 17:10 ` Catalin Marinas
2022-05-10 17:10 ` Catalin Marinas
2022-05-12 3:57 ` Herbert Xu
2022-05-12 3:57 ` Herbert Xu
2022-05-10 11:07 ` [RFC PATCH 3/7] crypto: aead - Add ctx helpers with DMA alignment Herbert Xu
2022-05-10 11:07 ` Herbert Xu
2022-05-10 11:07 ` [RFC PATCH 4/7] crypto: hash " Herbert Xu
2022-05-10 11:07 ` Herbert Xu
2022-05-10 11:07 ` [RFC PATCH 5/7] crypto: skcipher " Herbert Xu
2022-05-10 11:07 ` Herbert Xu
2022-05-10 11:07 ` [RFC PATCH 6/7] crypto: api - Increase MAX_ALGAPI_ALIGNMASK to 127 Herbert Xu
2022-05-10 11:07 ` Herbert Xu
2022-05-10 11:07 ` [RFC PATCH 7/7] crypto: caam - Explicitly request DMA alignment Herbert Xu
2022-05-10 11:07 ` Herbert Xu
2022-04-15 12:18 ` [PATCH 07/10] crypto: Use ARCH_DMA_MINALIGN instead of ARCH_KMALLOC_MINALIGN Catalin Marinas
2022-04-15 12:18 ` Catalin Marinas
2022-04-15 12:25 ` Ard Biesheuvel
2022-04-15 12:25 ` Ard Biesheuvel
2022-04-15 9:51 ` Catalin Marinas
2022-04-15 9:51 ` Catalin Marinas
2022-04-15 12:31 ` Catalin Marinas
2022-04-15 12:31 ` Catalin Marinas
2022-04-17 8:11 ` Herbert Xu
2022-04-17 8:11 ` Herbert Xu
2022-04-17 8:38 ` Catalin Marinas
2022-04-17 8:38 ` Catalin Marinas
2022-04-17 8:43 ` Herbert Xu
2022-04-17 8:43 ` Herbert Xu
2022-04-17 16:29 ` Catalin Marinas
2022-04-17 16:29 ` Catalin Marinas
2022-07-15 22:23 ` Isaac Manjarres [this message]
2022-07-15 22:23 ` Isaac Manjarres
2022-07-16 3:25 ` Herbert Xu
2022-07-16 3:25 ` Herbert Xu
2022-07-18 17:53 ` Catalin Marinas
2022-07-18 17:53 ` Catalin Marinas
2022-09-21 0:47 ` Isaac Manjarres
2022-09-21 0:47 ` Isaac Manjarres
2022-09-30 18:32 ` Catalin Marinas
2022-09-30 18:32 ` Catalin Marinas
2022-09-30 19:35 ` Linus Torvalds
2022-09-30 19:35 ` Linus Torvalds
2022-10-01 22:29 ` Catalin Marinas
2022-10-01 22:29 ` Catalin Marinas
2022-10-02 17:00 ` Linus Torvalds
2022-10-02 17:00 ` Linus Torvalds
2022-10-02 22:08 ` Ard Biesheuvel
2022-10-02 22:08 ` Ard Biesheuvel
2022-10-02 22:24 ` Linus Torvalds
2022-10-02 22:24 ` Linus Torvalds
2022-10-03 17:39 ` Catalin Marinas
2022-10-03 17:39 ` Catalin Marinas
2022-10-12 17:45 ` Isaac Manjarres
2022-10-12 17:45 ` Isaac Manjarres
2022-10-13 16:57 ` Catalin Marinas
2022-10-13 16:57 ` Catalin Marinas
2022-10-13 18:58 ` Saravana Kannan
2022-10-13 18:58 ` Saravana Kannan
2022-10-14 16:25 ` Catalin Marinas
2022-10-14 16:25 ` Catalin Marinas
2022-10-14 20:23 ` Saravana Kannan
2022-10-14 20:23 ` Saravana Kannan
2022-10-14 20:44 ` Linus Torvalds
2022-10-14 20:44 ` Linus Torvalds
2022-10-16 21:37 ` Catalin Marinas
2022-10-16 21:37 ` Catalin Marinas
2022-04-12 10:20 ` Catalin Marinas
2022-04-12 10:20 ` Catalin Marinas
2022-04-07 6:14 ` Muchun Song
2022-04-07 6:14 ` Muchun Song
2022-04-07 9:25 ` Catalin Marinas
2022-04-07 9:25 ` Catalin Marinas
2022-04-07 10:00 ` Muchun Song
2022-04-07 10:00 ` Muchun Song
2022-04-07 11:06 ` Catalin Marinas
2022-04-07 11:06 ` Catalin Marinas
2022-04-05 13:57 ` [PATCH 08/10] mm/slab: Allow dynamic kmalloc() minimum alignment Catalin Marinas
2022-04-05 13:57 ` Catalin Marinas
2022-04-07 3:46 ` Hyeonggon Yoo
2022-04-07 3:46 ` Hyeonggon Yoo
2022-04-07 8:50 ` Catalin Marinas
2022-04-07 8:50 ` Catalin Marinas
2022-04-07 9:18 ` Hyeonggon Yoo
2022-04-07 9:18 ` Hyeonggon Yoo
2022-04-07 9:35 ` Catalin Marinas
2022-04-07 9:35 ` Catalin Marinas
2022-04-07 12:26 ` Hyeonggon Yoo
2022-04-07 12:26 ` Hyeonggon Yoo
2022-04-11 11:55 ` Hyeonggon Yoo
2022-04-11 11:55 ` Hyeonggon Yoo
2022-04-05 13:57 ` [PATCH 09/10] mm/slab: Simplify create_kmalloc_cache() args and make it static Catalin Marinas
2022-04-05 13:57 ` Catalin Marinas
2022-04-06 5:35 ` kernel test robot
2022-04-06 8:57 ` Catalin Marinas
2022-04-06 8:57 ` Catalin Marinas
2022-04-05 13:57 ` [PATCH 10/10] arm64: Enable dynamic kmalloc() minimum alignment Catalin Marinas
2022-04-05 13:57 ` Catalin Marinas
2022-04-07 14:40 ` [PATCH 00/10] mm, arm64: Reduce ARCH_KMALLOC_MINALIGN below the cache line size Vlastimil Babka
2022-04-07 14:40 ` Vlastimil Babka
2022-04-07 17:48 ` Catalin Marinas
2022-04-07 17:48 ` Catalin Marinas
2022-04-08 14:37 ` Vlastimil Babka
2022-04-08 14:37 ` Vlastimil Babka
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