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>
93 lines
3.2 KiB
C
93 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Netfs support statistics
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*
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* Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include <linux/export.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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atomic_t netfs_n_rh_dio_read;
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atomic_t netfs_n_rh_readahead;
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atomic_t netfs_n_rh_read_folio;
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atomic_t netfs_n_rh_rreq;
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atomic_t netfs_n_rh_sreq;
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atomic_t netfs_n_rh_download;
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atomic_t netfs_n_rh_download_done;
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atomic_t netfs_n_rh_download_failed;
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atomic_t netfs_n_rh_download_instead;
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atomic_t netfs_n_rh_read;
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atomic_t netfs_n_rh_read_done;
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atomic_t netfs_n_rh_read_failed;
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atomic_t netfs_n_rh_zero;
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atomic_t netfs_n_rh_short_read;
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atomic_t netfs_n_rh_write;
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atomic_t netfs_n_rh_write_begin;
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atomic_t netfs_n_rh_write_done;
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atomic_t netfs_n_rh_write_failed;
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atomic_t netfs_n_rh_write_zskip;
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atomic_t netfs_n_wh_buffered_write;
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atomic_t netfs_n_wh_writethrough;
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atomic_t netfs_n_wh_dio_write;
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atomic_t netfs_n_wh_writepages;
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atomic_t netfs_n_wh_copy_to_cache;
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atomic_t netfs_n_wh_wstream_conflict;
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atomic_t netfs_n_wh_upload;
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atomic_t netfs_n_wh_upload_done;
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atomic_t netfs_n_wh_upload_failed;
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atomic_t netfs_n_wh_write;
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atomic_t netfs_n_wh_write_done;
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atomic_t netfs_n_wh_write_failed;
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atomic_t netfs_n_wb_lock_skip;
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atomic_t netfs_n_wb_lock_wait;
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atomic_t netfs_n_folioq;
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int netfs_stats_show(struct seq_file *m, void *v)
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{
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seq_printf(m, "Reads : DR=%u RA=%u RF=%u WB=%u WBZ=%u\n",
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atomic_read(&netfs_n_rh_dio_read),
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atomic_read(&netfs_n_rh_readahead),
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atomic_read(&netfs_n_rh_read_folio),
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atomic_read(&netfs_n_rh_write_begin),
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atomic_read(&netfs_n_rh_write_zskip));
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seq_printf(m, "Writes : BW=%u WT=%u DW=%u WP=%u 2C=%u\n",
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atomic_read(&netfs_n_wh_buffered_write),
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atomic_read(&netfs_n_wh_writethrough),
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atomic_read(&netfs_n_wh_dio_write),
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atomic_read(&netfs_n_wh_writepages),
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atomic_read(&netfs_n_wh_copy_to_cache));
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seq_printf(m, "ZeroOps: ZR=%u sh=%u sk=%u\n",
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atomic_read(&netfs_n_rh_zero),
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atomic_read(&netfs_n_rh_short_read),
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atomic_read(&netfs_n_rh_write_zskip));
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seq_printf(m, "DownOps: DL=%u ds=%u df=%u di=%u\n",
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atomic_read(&netfs_n_rh_download),
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atomic_read(&netfs_n_rh_download_done),
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atomic_read(&netfs_n_rh_download_failed),
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atomic_read(&netfs_n_rh_download_instead));
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seq_printf(m, "CaRdOps: RD=%u rs=%u rf=%u\n",
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atomic_read(&netfs_n_rh_read),
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atomic_read(&netfs_n_rh_read_done),
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atomic_read(&netfs_n_rh_read_failed));
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seq_printf(m, "UpldOps: UL=%u us=%u uf=%u\n",
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atomic_read(&netfs_n_wh_upload),
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atomic_read(&netfs_n_wh_upload_done),
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atomic_read(&netfs_n_wh_upload_failed));
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seq_printf(m, "CaWrOps: WR=%u ws=%u wf=%u\n",
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atomic_read(&netfs_n_wh_write),
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atomic_read(&netfs_n_wh_write_done),
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atomic_read(&netfs_n_wh_write_failed));
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seq_printf(m, "Objs : rr=%u sr=%u foq=%u wsc=%u\n",
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atomic_read(&netfs_n_rh_rreq),
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atomic_read(&netfs_n_rh_sreq),
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atomic_read(&netfs_n_folioq),
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atomic_read(&netfs_n_wh_wstream_conflict));
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seq_printf(m, "WbLock : skip=%u wait=%u\n",
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atomic_read(&netfs_n_wb_lock_skip),
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atomic_read(&netfs_n_wb_lock_wait));
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return fscache_stats_show(m);
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}
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EXPORT_SYMBOL(netfs_stats_show);
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