Messages in this thread | | | From | "Fabio M. De Francesco" <> | Subject | [PATCH 0/3] btrfs: Replace kmap() with kmap_local_page() | Date | Tue, 31 May 2022 16:53:32 +0200 |
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This is the first series of patches aimed towards the conversion of Btrfs filesystem from the use of kmap() to kmap_local_page().
The use of kmap() is being deprecated in favor of kmap_local_page() where it is feasible. With kmap_local_page() the mapping is per thread, CPU local and not globally visible.
Therefore, use kmap_local_page() / kunmap_local() in Btrfs wherever the mappings are per thread and not globally visible.
Tested on QEMU + KVM 32 bits VM with 4GB of RAM and HIGHMEM64G enabled.
tweed32:~ # uname -a Linux tweed32 5.18.0-torvalds-debug-x86_32+ #2 SMP PREEMPT_DYNAMIC Tue \ May 31 15:20:07 CEST 2022 i686 athlon i386 GNU/Linux
tweed32:~ # btrfs check -p ~zoek/dev/btrfs.file Opening filesystem to check... Checking filesystem on /home/zoek/dev/btrfs.file UUID: 897d65c5-1167-45b4-b811-2bfe74a320ca [1/7] checking root items (0:00:00 elapsed, 1774 items checked) [2/7] checking extents (0:00:00 elapsed, 135 items checked) [3/7] checking free space tree (0:00:00 elapsed, 4 items checked) [4/7] checking fs roots (0:00:00 elapsed, 104 items checked) [5/7] checking csums (without verifying data) (0:00:00 elapsed, 205 items checked) [6/7] checking root refs (0:00:00 elapsed, 3 items checked) [7/7] checking quota groups skipped (not enabled on this FS) found 47394816 bytes used, no error found total csum bytes: 44268 total tree bytes: 2064384 total fs tree bytes: 1720320 total extent tree bytes: 180224 btree space waste bytes: 465350 file data blocks allocated: 45330432 referenced 45330432
Fabio M. De Francesco (3): btrfs: Replace kmap() with kmap_local_page() in inode.c btrfs: Replace kmap() with kmap_local_page() in lzo.c btrfs: Replace kmap() with kmap_local_page() in zlib.c
fs/btrfs/inode.c | 6 +++--- fs/btrfs/lzo.c | 28 ++++++++++++---------------- fs/btrfs/zlib.c | 40 ++++++++++++++++++++-------------------- 3 files changed, 35 insertions(+), 39 deletions(-)
-- 2.36.1
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