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ee4cdf7ba8
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>
34 lines
595 B
Makefile
34 lines
595 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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netfs-y := \
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buffered_read.o \
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buffered_write.o \
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direct_read.o \
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direct_write.o \
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iterator.o \
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locking.o \
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main.o \
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misc.o \
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objects.o \
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read_collect.o \
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read_pgpriv2.o \
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read_retry.o \
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write_collect.o \
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write_issue.o
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netfs-$(CONFIG_NETFS_STATS) += stats.o
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netfs-$(CONFIG_FSCACHE) += \
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fscache_cache.o \
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fscache_cookie.o \
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fscache_io.o \
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fscache_main.o \
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fscache_volume.o
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ifeq ($(CONFIG_PROC_FS),y)
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netfs-$(CONFIG_FSCACHE) += fscache_proc.o
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endif
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netfs-$(CONFIG_FSCACHE_STATS) += fscache_stats.o
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obj-$(CONFIG_NETFS_SUPPORT) += netfs.o
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