David Howells ee4cdf7ba8 netfs: Speed up buffered reading ... Improve the efficiency of buffered reads in a number of ways: (1) Overhaul the algorithm in general so that it's a lot more compact and split the read submission code between buffered and unbuffered versions. The unbuffered version can be vastly simplified. (2) Read-result collection is handed off to a work queue rather than being done in the I/O thread. Multiple subrequests can be processes simultaneously. (3) When a subrequest is collected, any folios it fully spans are collected and "spare" data on either side is donated to either the previous or the next subrequest in the sequence. Notes: (*) Readahead expansion is massively slows down fio, presumably because it causes a load of extra allocations, both folio and xarray, up front before RPC requests can be transmitted. (*) RDMA with cifs does appear to work, both with SIW and RXE. (*) PG_private_2-based reading and copy-to-cache is split out into its own file and altered to use folio_queue. Note that the copy to the cache now creates a new write transaction against the cache and adds the folios to be copied into it. This allows it to use part of the writeback I/O code. Signed-off-by: David Howells <dhowells@redhat.com> cc: Jeff Layton <jlayton@kernel.org> cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Link: https://lore.kernel.org/r/20240814203850.2240469-20-dhowells@redhat.com/ # v2 Signed-off-by: Christian Brauner <brauner@kernel.org>		2024-09-12 12:20:41 +02:00
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acl.c
acl.h
cache.c
cache.h
fid.c
fid.h
Kconfig
Makefile
v9fs.c
v9fs.h
v9fs_vfs.h
vfs_addr.c	netfs: Speed up buffered reading	2024-09-12 12:20:41 +02:00
vfs_dentry.c
vfs_dir.c
vfs_file.c
vfs_inode.c
vfs_inode_dotl.c
vfs_super.c
xattr.c
xattr.h