kernel_optimize_test/drivers/md/bcache
Coly Li 038ba8cc1b bcache: add readahead cache policy options via sysfs interface
In year 2007 high performance SSD was still expensive, in order to
save more space for real workload or meta data, the readahead I/Os
for non-meta data was bypassed and not cached on SSD.

In now days, SSD price drops a lot and people can find larger size
SSD with more comfortable price. It is unncessary to alway bypass
normal readahead I/Os to save SSD space for now.

This patch adds options for readahead data cache policies via sysfs
file /sys/block/bcache<N>/readahead_cache_policy, the options are,
- "all": cache all readahead data I/Os.
- "meta-only": only cache meta data, and bypass other regular I/Os.

If users want to make bcache continue to only cache readahead request
for metadata and bypass regular data readahead, please set "meta-only"
to this sysfs file. By default, bcache will back to cache all read-
ahead requests now.

Cc: stable@vger.kernel.org
Signed-off-by: Coly Li <colyli@suse.de>
Acked-by: Eric Wheeler <bcache@linux.ewheeler.net>
Cc: Michael Lyle <mlyle@lyle.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-02-01 07:55:39 -07:00
..
alloc.c bcache: fix deadlock in bcache_allocator 2019-11-13 15:42:50 -07:00
bcache.h bcache: add readahead cache policy options via sysfs interface 2020-02-01 07:55:39 -07:00
bset.c bcache: add code comments for state->pool in __btree_sort() 2020-01-23 11:40:02 -07:00
bset.h bcache: explicity type cast in bset_bkey_last() 2020-02-01 07:55:39 -07:00
btree.c bcache: reap from tail of c->btree_cache in bch_mca_scan() 2020-01-23 11:40:02 -07:00
btree.h bcache: remove member accessed from struct btree 2020-01-23 11:40:02 -07:00
closure.c bcache: don't export symbols 2019-11-13 15:42:51 -07:00
closure.h bcache: fix typo in code comments of closure_return_with_destructor() 2018-10-08 08:19:43 -06:00
debug.c bcache: Fix an error code in bch_dump_read() 2019-09-03 08:08:29 -06:00
debug.h bcache: add identifier names to arguments of function definitions 2018-08-11 15:46:41 -06:00
extents.c bcache: treat stale && dirty keys as bad keys 2019-02-09 07:18:31 -07:00
extents.h bcache: add identifier names to arguments of function definitions 2018-08-11 15:46:41 -06:00
io.c bcache: ignore read-ahead request failure on backing device 2019-06-28 07:39:14 -06:00
journal.c bcache: avoid unnecessary btree nodes flushing in btree_flush_write() 2020-01-23 11:40:02 -07:00
journal.h Revert "bcache: fix fifo index swapping condition in journal_pin_cmp()" 2019-11-18 08:35:47 -07:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile bcache: remove the extra cflags for request.o 2019-11-13 15:42:50 -07:00
movinggc.c bcache: style fix to add a blank line after declarations 2018-08-11 15:46:41 -06:00
request.c bcache: add readahead cache policy options via sysfs interface 2020-02-01 07:55:39 -07:00
request.h bcache: Clean up bch_get_congested() 2019-04-24 10:56:27 -06:00
stats.c bcache: fix memory corruption in bch_cache_accounting_clear() 2020-02-01 07:55:39 -07:00
stats.h bcache: add identifier names to arguments of function definitions 2018-08-11 15:46:41 -06:00
super.c bcache: use read_cache_page_gfp to read the superblock 2020-01-23 11:40:01 -07:00
sysfs.c bcache: add readahead cache policy options via sysfs interface 2020-02-01 07:55:39 -07:00
sysfs.h bcache: add sysfs_strtoul_bool() for setting bit-field variables 2019-02-09 07:18:32 -07:00
trace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
util.c bcache: avoid to use bio_for_each_segment_all() in bch_bio_alloc_pages() 2019-02-15 08:40:11 -07:00
util.h bcache: Revert "bcache: fix high CPU occupancy during journal" 2019-06-28 07:39:17 -06:00
writeback.c bcache: add idle_max_writeback_rate sysfs interface 2019-11-13 15:42:50 -07:00
writeback.h bcache: never writeback a discard operation 2019-02-09 07:18:31 -07:00