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| author |   David Howells <dhowells@redhat.com> | 2024-07-02 00:40:22 +0100 |
|---|---|---|
| committer |   Christian Brauner <brauner@kernel.org> | 2024-09-12 12:20:41 +0200 |
| commit | ee4cdf7ba857a894ad1650d6ab77669cbbfa329e (patch) | |
| tree | 8258e3b756adf109085d66a8b63cd08db03abad0 /fs/netfs/main.c | |
| parent | afs: Make read subreqs async (diff) | |
| download | linux-rng-ee4cdf7ba857a894ad1650d6ab77669cbbfa329e.tar.xz linux-rng-ee4cdf7ba857a894ad1650d6ab77669cbbfa329e.zip | |
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>
Diffstat (limited to 'fs/netfs/main.c')
| -rw-r--r-- | fs/netfs/main.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/netfs/main.c b/fs/netfs/main.c index 1ee712bb3610..4f7212ca3470 100644 --- a/fs/netfs/main.c +++ b/fs/netfs/main.c @@ -36,12 +36,14 @@ DEFINE_SPINLOCK(netfs_proc_lock); static const char *netfs_origins[nr__netfs_io_origin] = { [NETFS_READAHEAD] = "RA", [NETFS_READPAGE] = "RP", + [NETFS_READ_GAPS] = "RG", [NETFS_READ_FOR_WRITE] = "RW", [NETFS_DIO_READ] = "DR", [NETFS_WRITEBACK] = "WB", [NETFS_WRITETHROUGH] = "WT", [NETFS_UNBUFFERED_WRITE] = "UW", [NETFS_DIO_WRITE] = "DW", + [NETFS_PGPRIV2_COPY_TO_CACHE] = "2C", }; /* @@ -61,7 +63,7 @@ static int netfs_requests_seq_show(struct seq_file *m, void *v) rreq = list_entry(v, struct netfs_io_request, proc_link); seq_printf(m, - "%08x %s %3d %2lx %4d %3d @%04llx %llx/%llx", + "%08x %s %3d %2lx %4ld %3d @%04llx %llx/%llx", rreq->debug_id, netfs_origins[rreq->origin], refcount_read(&rreq->ref), |