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author | Ilya Dryomov <idryomov@gmail.com> | 2017-01-31 15:55:06 +0100 |
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committer | Ilya Dryomov <idryomov@gmail.com> | 2017-02-20 12:16:11 +0100 |
commit | 743efcffffc6620ab44ea9ec67c7e4e28dfa7742 (patch) | |
tree | a087b21bd95308161d8b14269452efd1e798949d /include/linux/crush | |
parent | 66a0e2d579dbec5c676cfe446234ffebb267c564 (diff) | |
download | linux-743efcffffc6620ab44ea9ec67c7e4e28dfa7742.tar.gz |
crush: merge working data and scratch
Much like Arlo Guthrie, I decided that one big pile is better than two
little piles.
Reflects ceph.git commit 95c2df6c7e0b22d2ea9d91db500cf8b9441c73ba.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'include/linux/crush')
-rw-r--r-- | include/linux/crush/mapper.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/include/linux/crush/mapper.h b/include/linux/crush/mapper.h index 3303c7fd8a31..c95e19e1ff11 100644 --- a/include/linux/crush/mapper.h +++ b/include/linux/crush/mapper.h @@ -15,7 +15,19 @@ extern int crush_do_rule(const struct crush_map *map, int ruleno, int x, int *result, int result_max, const __u32 *weights, int weight_max, - void *cwin, int *scratch); + void *cwin); + +/* + * Returns the exact amount of workspace that will need to be used + * for a given combination of crush_map and result_max. The caller can + * then allocate this much on its own, either on the stack, in a + * per-thread long-lived buffer, or however it likes. + */ +static inline size_t crush_work_size(const struct crush_map *map, + int result_max) +{ + return map->working_size + result_max * 3 * sizeof(__u32); +} void crush_init_workspace(const struct crush_map *map, void *v); |