forked from luck/tmp_suning_uos_patched
038ba8cc1b
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> |
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.. | ||
alloc.c | ||
bcache.h | ||
bset.c | ||
bset.h | ||
btree.c | ||
btree.h | ||
closure.c | ||
closure.h | ||
debug.c | ||
debug.h | ||
extents.c | ||
extents.h | ||
io.c | ||
journal.c | ||
journal.h | ||
Kconfig | ||
Makefile | ||
movinggc.c | ||
request.c | ||
request.h | ||
stats.c | ||
stats.h | ||
super.c | ||
sysfs.c | ||
sysfs.h | ||
trace.c | ||
util.c | ||
util.h | ||
writeback.c | ||
writeback.h |