libceph: add support for osd primary affinity
Respond to non-default primary_affinity values accordingly. (Primary
affinity allows the admin to shift 'primary responsibility' away from
specific osds, effectively shifting around the read side of the
workload and whatever overhead is incurred by peering and writes by
virtue of being the primary).
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index 20a38a3..ae8f367 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -1596,6 +1596,72 @@
return len;
}
+static void apply_primary_affinity(struct ceph_osdmap *osdmap, u32 pps,
+ struct ceph_pg_pool_info *pool,
+ int *osds, int len, int *primary)
+{
+ int i;
+ int pos = -1;
+
+ /*
+ * Do we have any non-default primary_affinity values for these
+ * osds?
+ */
+ if (!osdmap->osd_primary_affinity)
+ return;
+
+ for (i = 0; i < len; i++) {
+ if (osds[i] != CRUSH_ITEM_NONE &&
+ osdmap->osd_primary_affinity[i] !=
+ CEPH_OSD_DEFAULT_PRIMARY_AFFINITY) {
+ break;
+ }
+ }
+ if (i == len)
+ return;
+
+ /*
+ * Pick the primary. Feed both the seed (for the pg) and the
+ * osd into the hash/rng so that a proportional fraction of an
+ * osd's pgs get rejected as primary.
+ */
+ for (i = 0; i < len; i++) {
+ int osd;
+ u32 aff;
+
+ osd = osds[i];
+ if (osd == CRUSH_ITEM_NONE)
+ continue;
+
+ aff = osdmap->osd_primary_affinity[osd];
+ if (aff < CEPH_OSD_MAX_PRIMARY_AFFINITY &&
+ (crush_hash32_2(CRUSH_HASH_RJENKINS1,
+ pps, osd) >> 16) >= aff) {
+ /*
+ * We chose not to use this primary. Note it
+ * anyway as a fallback in case we don't pick
+ * anyone else, but keep looking.
+ */
+ if (pos < 0)
+ pos = i;
+ } else {
+ pos = i;
+ break;
+ }
+ }
+ if (pos < 0)
+ return;
+
+ *primary = osds[pos];
+
+ if (ceph_can_shift_osds(pool) && pos > 0) {
+ /* move the new primary to the front */
+ for (i = pos; i > 0; i--)
+ osds[i] = osds[i - 1];
+ osds[0] = *primary;
+ }
+}
+
/*
* Given up set, apply pg_temp and primary_temp mappings.
*
@@ -1698,6 +1764,8 @@
len = raw_to_up_osds(osdmap, pool, osds, len, primary);
+ apply_primary_affinity(osdmap, pps, pool, osds, len, primary);
+
len = apply_temps(osdmap, pool, pgid, osds, len, primary);
return len;