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linux/fs/cachefiles
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Xin Yin 1122f40072 cachefiles: make on-demand request distribution fairer 
For now, enqueuing and dequeuing on-demand requests all start from
idx 0, this makes request distribution unfair. In the weighty
concurrent I/O scenario, the request stored in higher idx will starve.

Searching requests cyclically in cachefiles_ondemand_daemon_read,
makes distribution fairer.

Fixes: c838305450 ("cachefiles: notify the user daemon when looking up cookie")
Reported-by: Yongqing Li <liyongqing@bytedance.com>
Signed-off-by: Xin Yin <yinxin.x@bytedance.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220817065200.11543-1-yinxin.x@bytedance.com/ # v1
Link: https://lore.kernel.org/r/20220825020945.2293-1-yinxin.x@bytedance.com/ # v2
History 2022-08-31 16:41:10 +01:00
..
cache.c cachefiles: Check that the backing filesystem supports tmpfiles 2022-01-21 21:36:28 +00:00
daemon.c cachefiles: enable on-demand read mode 2022-05-18 00:11:18 +08:00
error_inject.c cachefiles: Add some error injection support 2022-01-07 13:40:56 +00:00
interface.c cachefiles: notify the user daemon when withdrawing cookie 2022-05-18 00:11:17 +08:00
internal.h cachefiles: make on-demand request distribution fairer 2022-08-31 16:41:10 +01:00
io.c cachefiles: implement on-demand read 2022-05-18 00:11:18 +08:00
Kconfig cachefiles: notify the user daemon when looking up cookie 2022-05-18 00:11:17 +08:00
key.c cachefiles: Implement key to filename encoding 2022-01-07 13:42:16 +00:00
main.c cachefiles: Implement object lifecycle funcs 2022-01-07 13:42:08 +00:00
Makefile cachefiles: notify the user daemon when looking up cookie 2022-05-18 00:11:17 +08:00
namei.c cachefiles: notify the user daemon when looking up cookie 2022-05-18 00:11:17 +08:00
ondemand.c cachefiles: make on-demand request distribution fairer 2022-08-31 16:41:10 +01:00
security.c cachefiles: Add security derivation 2022-01-07 13:41:14 +00:00
volume.c fscache, cachefiles: Store the volume coherency data 2022-01-07 13:43:03 +00:00
xattr.c cachefiles: Fix KASAN slab-out-of-bounds in cachefiles_set_volume_xattr 2022-04-08 23:32:40 +01:00