From: Adam Kupczyk <akupczyk@redhat.com>
Date: Mon, 25 Jan 2021 10:45:06 +0000 (+0100)
Subject: common/mempool: Modify shard selection function
X-Git-Tag: v14.2.17~19^2~3
X-Git-Url: http://git.apps.os.sepia.ceph.com/?a=commitdiff_plain;h=d7efce1b3b6cd8160c4f26f4f1dfa9d0d65a47d4;p=ceph.git

common/mempool: Modify shard selection function

Modify shard selection function, so no longer all threads use the same shard 0.

Signed-off-by: Adam Kupczyk <akupczyk@redhat.com>
(cherry picked from commit fccbdc0905e3868666fbb10803bac6b73f687cb1)
---

diff --git a/src/include/mempool.h b/src/include/mempool.h
index c4b0086c106c0..9cee38256ea66 100644
--- a/src/include/mempool.h
+++ b/src/include/mempool.h
@@ -258,7 +258,7 @@ public:
     // Dirt cheap, see:
     //   https://fossies.org/dox/glibc-2.32/pthread__self_8c_source.html
     size_t me = (size_t)pthread_self();
-    size_t i = (me >> 3) & ((1 << num_shard_bits) - 1);
+    size_t i = (me >> 12) & ((1 << num_shard_bits) - 1);
     return i;
   }