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| author |   Ilya Dryomov <idryomov@gmail.com> | 2016-01-31 14:36:07 +0100 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2016-02-04 18:25:55 +0100 |
| commit | dc6ae6d8e7726bad4f1c87244b49cac851746c65 (patch) | |
| tree | 3782e77f13157c488cd9a49db5726e7411f0a2d7 /include | |
| parent | crush: ensure take bucket value is valid (diff) | |
| download | linux-dev-dc6ae6d8e7726bad4f1c87244b49cac851746c65.tar.xz linux-dev-dc6ae6d8e7726bad4f1c87244b49cac851746c65.zip | |
crush: add chooseleaf_stable tunable
Add a tunable to fix the bug that chooseleaf may cause unnecessary pg
migrations when some device fails.
Reflects ceph.git commit fdb3f664448e80d984470f32f04e2e6f03ab52ec.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Sage Weil <sage@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/crush/crush.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/crush/crush.h b/include/linux/crush/crush.h index 48b49305716b..be8f12b8f195 100644 --- a/include/linux/crush/crush.h +++ b/include/linux/crush/crush.h @@ -59,7 +59,8 @@ enum { CRUSH_RULE_SET_CHOOSELEAF_TRIES = 9, /* override chooseleaf_descend_once */ CRUSH_RULE_SET_CHOOSE_LOCAL_TRIES = 10, CRUSH_RULE_SET_CHOOSE_LOCAL_FALLBACK_TRIES = 11, - CRUSH_RULE_SET_CHOOSELEAF_VARY_R = 12 + CRUSH_RULE_SET_CHOOSELEAF_VARY_R = 12, + CRUSH_RULE_SET_CHOOSELEAF_STABLE = 13 }; /* @@ -205,6 +206,11 @@ struct crush_map { * mappings line up a bit better with previous mappings. */ __u8 chooseleaf_vary_r; + /* if true, it makes chooseleaf firstn to return stable results (if + * no local retry) so that data migrations would be optimal when some + * device fails. */ + __u8 chooseleaf_stable; + #ifndef __KERNEL__ /* * version 0 (original) of straw_calc has various flaws. version 1 |