From: David Sterba <dsterba@suse.com>
To: linux-btrfs@vger.kernel.org
Cc: David Sterba <dsterba@suse.com>
Subject: [PATCH 0/6] Remove highmem allocations, kmap/kunmap
Date: Thu, 8 Jul 2021 13:45:06 +0200 [thread overview]
Message-ID: <cover.1625043706.git.dsterba@suse.com> (raw)
The highmem was maybe was a good idea long time ago but with 64bit
architectures everywhere I don't think we need to take it into account.
This does not mean this 32bit won't work, just that it won't try to use
temporary pages in highmem for compression and raid56. The key word is
temporary. Combining a very fast device (like hundreds of megabytes
throughput) and 32bit machine with reasonable memory (for 32bit, like
8G), it could become a problem once low memory is scarce.
David Sterba (6):
btrfs: drop from __GFP_HIGHMEM all allocations
btrfs: compression: drop kmap/kunmap from lzo
btrfs: compression: drop kmap/kunmap from zlib
btrfs: compression: drop kmap/kunmap from zstd
btrfs: compression: drop kmap/kunmap from generic helpers
btrfs: check-integrity: drop kmap/kunmap for block pages
fs/btrfs/check-integrity.c | 11 +++-------
fs/btrfs/compression.c | 6 ++----
fs/btrfs/inode.c | 3 +--
fs/btrfs/lzo.c | 42 +++++++++++---------------------------
fs/btrfs/raid56.c | 10 ++++-----
fs/btrfs/zlib.c | 42 +++++++++++++-------------------------
fs/btrfs/zstd.c | 33 +++++++++++-------------------
7 files changed, 49 insertions(+), 98 deletions(-)
--
2.31.1
next reply other threads:[~2021-07-08 11:47 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-08 11:45 David Sterba [this message]
2021-07-08 11:45 ` [PATCH 1/6] btrfs: drop from __GFP_HIGHMEM all allocations David Sterba
2021-07-08 11:45 ` [PATCH 2/6] btrfs: compression: drop kmap/kunmap from lzo David Sterba
2021-07-08 11:45 ` [PATCH 3/6] btrfs: compression: drop kmap/kunmap from zlib David Sterba
2021-07-08 11:45 ` [PATCH 4/6] btrfs: compression: drop kmap/kunmap from zstd David Sterba
2021-07-08 11:45 ` [PATCH 5/6] btrfs: compression: drop kmap/kunmap from generic helpers David Sterba
2021-07-08 11:45 ` [PATCH 6/6] btrfs: check-integrity: drop kmap/kunmap for block pages David Sterba
2021-07-08 12:45 ` [PATCH 0/6] Remove highmem allocations, kmap/kunmap Neal Gompa
2021-07-08 12:49 ` David Sterba
2021-07-08 22:24 ` Neal Gompa
2021-07-08 23:53 ` Qu Wenruo
2021-07-09 6:46 ` Christoph Hellwig
2021-07-09 7:12 ` Qu Wenruo
2021-07-09 12:15 ` Neal Gompa
2021-07-10 9:50 ` Qu Wenruo
2021-07-10 11:15 ` Christoph Hellwig
2021-07-10 11:37 ` Qu Wenruo
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