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SubjectFwd: Re: [PATCH v4] btrfs: Use larger zlib buffer for s390 hardware compression
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Hello Andrew,

Could you please pick this V4 btrfs patch and the other five patches from V3 patch
set (https://lkml.org/lkml/2020/1/3/568).

Older patches can be dropped from linux-next:
* ac2aeaa0f4d3 btrfs: use larger zlib buffer for s390 hardware compression
* ac19f15aea33 lib/zlib: add zlib_deflate_dfltcc_enabled() function
* 3447c9a51196 s390/boot: add dfltcc= kernel command line parameter
* 890060df4401 lib/zlib: add s390 hardware support for kernel zlib_inflate
* 148f7d060405 s390/boot: rename HEAP_SIZE due to name collision
* bfbef17740fd lib/zlib: add s390 hardware support for kernel zlib_deflate

Thanks,
Mikhail.


-------- Forwarded Message --------
Subject: Re: [PATCH v4] btrfs: Use larger zlib buffer for s390 hardware compression
Date: Tue, 14 Jan 2020 17:18:57 +0100
From: David Sterba <dsterba@suse.cz>
Reply-To: dsterba@suse.cz
To: Mikhail Zaslonko <zaslonko@linux.ibm.com>
CC: Andrew Morton <akpm@linux-foundation.org>, Chris Mason <clm@fb.com>, Josef Bacik <josef@toxicpanda.com>, David Sterba <dsterba@suse.com>, Richard Purdie <rpurdie@rpsys.net>, Heiko Carstens <heiko.carstens@de.ibm.com>, Vasily Gorbik <gor@linux.ibm.com>, Christian Borntraeger <borntraeger@de.ibm.com>, Eduard Shishkin <edward6@linux.ibm.com>, Ilya Leoshkevich <iii@linux.ibm.com>, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org

On Wed, Jan 08, 2020 at 11:51:03AM +0100, Mikhail Zaslonko wrote:
> In order to benefit from s390 zlib hardware compression support,
> increase the btrfs zlib workspace buffer size from 1 to 4 pages (if
> s390 zlib hardware support is enabled on the machine). This brings up
> to 60% better performance in hardware on s390 compared to the PAGE_SIZE
> buffer and much more compared to the software zlib processing in btrfs.
> In case of memory pressure, fall back to a single page buffer during
> workspace allocation.
> The data compressed with larger input buffers will still conform to zlib
> standard and thus can be decompressed also on a systems that uses only
> PAGE_SIZE buffer for btrfs zlib.
>
> Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>

Reviewed-by: David Sterba <dsterba@suse.com>

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