From: Chris Mason <clm@fb.com>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Josef Bacik <josef@toxicpanda.com>,
David Sterba <dsterba@suse.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
linux-btrfs <linux-btrfs@vger.kernel.org>,
"linux-hexagon@vger.kernel.org" <linux-hexagon@vger.kernel.org>
Subject: Re: [PATCH] btrfs: Disable BTRFS on platforms having 256K pages
Date: Thu, 10 Jun 2021 13:54:28 +0000 [thread overview]
Message-ID: <185278AF-1D87-432D-87E9-C86B3223113E@fb.com> (raw)
In-Reply-To: <a16c31f3caf448dda5d9315e056585b6fafc22c5.1623302442.git.christophe.leroy@csgroup.eu>
> On Jun 10, 2021, at 1:23 AM, Christophe Leroy <christophe.leroy@csgroup.eu> wrote:
>
> With a config having PAGE_SIZE set to 256K, BTRFS build fails
> with the following message
>
> include/linux/compiler_types.h:326:38: error: call to '__compiletime_assert_791' declared with attribute error: BUILD_BUG_ON failed: (BTRFS_MAX_COMPRESSED % PAGE_SIZE) != 0
>
> BTRFS_MAX_COMPRESSED being 128K, BTRFS cannot support platforms with
> 256K pages at the time being.
>
> There are two platforms that can select 256K pages:
> - hexagon
> - powerpc
>
> Disable BTRFS when 256K page size is selected.
>
We’ll have other subpage blocksize concerns with 256K pages, but this BTRFS_MAX_COMPRESSED #define is arbitrary. It’s just trying to have an upper bound on the amount of memory we’ll need to uncompress a single page’s worth of random reads.
We could change it to max(PAGE_SIZE, 128K) or just bump to 256K.
-chris
WARNING: multiple messages have this Message-ID (diff)
From: Chris Mason <clm@fb.com>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: "linux-hexagon@vger.kernel.org" <linux-hexagon@vger.kernel.org>,
Josef Bacik <josef@toxicpanda.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
David Sterba <dsterba@suse.com>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: [PATCH] btrfs: Disable BTRFS on platforms having 256K pages
Date: Thu, 10 Jun 2021 13:54:28 +0000 [thread overview]
Message-ID: <185278AF-1D87-432D-87E9-C86B3223113E@fb.com> (raw)
In-Reply-To: <a16c31f3caf448dda5d9315e056585b6fafc22c5.1623302442.git.christophe.leroy@csgroup.eu>
> On Jun 10, 2021, at 1:23 AM, Christophe Leroy <christophe.leroy@csgroup.eu> wrote:
>
> With a config having PAGE_SIZE set to 256K, BTRFS build fails
> with the following message
>
> include/linux/compiler_types.h:326:38: error: call to '__compiletime_assert_791' declared with attribute error: BUILD_BUG_ON failed: (BTRFS_MAX_COMPRESSED % PAGE_SIZE) != 0
>
> BTRFS_MAX_COMPRESSED being 128K, BTRFS cannot support platforms with
> 256K pages at the time being.
>
> There are two platforms that can select 256K pages:
> - hexagon
> - powerpc
>
> Disable BTRFS when 256K page size is selected.
>
We’ll have other subpage blocksize concerns with 256K pages, but this BTRFS_MAX_COMPRESSED #define is arbitrary. It’s just trying to have an upper bound on the amount of memory we’ll need to uncompress a single page’s worth of random reads.
We could change it to max(PAGE_SIZE, 128K) or just bump to 256K.
-chris
next prev parent reply other threads:[~2021-06-10 13:54 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-10 5:23 [PATCH] fs: btrfs: Disable BTRFS on platforms having 256K pages Christophe Leroy
2021-06-10 5:23 ` Christophe Leroy
2021-06-10 13:54 ` Chris Mason [this message]
2021-06-10 13:54 ` [PATCH] " Chris Mason
2021-06-10 14:50 ` Christophe Leroy
2021-06-10 14:50 ` Christophe Leroy
2021-06-10 16:20 ` David Sterba
2021-06-10 16:20 ` David Sterba
2021-06-11 12:58 ` Chris Mason
2021-06-11 12:58 ` Chris Mason
2021-06-11 13:21 ` David Sterba
2021-06-11 13:21 ` David Sterba
2021-06-11 16:56 ` Chris Mason
2021-06-11 16:56 ` Chris Mason
2021-06-12 14:44 ` Brian Cain
2021-06-12 14:44 ` Brian Cain
2021-06-11 12:34 ` [PATCH] fs: " David Sterba
2021-06-11 12:34 ` David Sterba
2021-06-11 13:47 ` Qu Wenruo
2021-06-11 13:47 ` Qu Wenruo
2022-01-04 23:32 ` Qu Wenruo
2022-01-04 23:32 ` Qu Wenruo
2022-01-06 16:31 ` Neal Gompa
2022-01-06 16:31 ` Neal Gompa
2022-01-07 0:13 ` Qu Wenruo
2022-01-07 0:13 ` Qu Wenruo
2022-01-07 2:45 ` Hector Martin
2022-01-07 2:45 ` Hector Martin
2022-01-07 4:55 ` Michael Ellerman
2022-01-07 4:55 ` Michael Ellerman
2022-01-07 5:21 ` Qu Wenruo
2022-01-07 5:21 ` Qu Wenruo
2022-01-10 8:29 ` Christophe Leroy
2022-01-10 8:29 ` Christophe Leroy
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