From: Jianpeng Ma <jianpeng.ma@intel.com>
Date: Wed, 18 Mar 2015 07:12:08 +0000 (+0800)
Subject: osd/ReplicatedPG: For flush object, set the src object with fadvise sequential/nocache.
X-Git-Tag: v9.0.1~123^2~1
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=ad1fd6e151b52cd634c77e7769c621d55ac6a6db;p=ceph.git

osd/ReplicatedPG: For flush object, set the src object with fadvise sequential/nocache.

Copy data from cache tier is copy whole data of object. So
fadvise_sequential can make good readahead.
From the base tier point, it don't hope left data in cache tier after
copying, so use fadvise_nocache is good method.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>
---

diff --git a/src/osd/ReplicatedPG.cc b/src/osd/ReplicatedPG.cc
index c2fae852bf8a..3967b697e02a 100644
--- a/src/osd/ReplicatedPG.cc
+++ b/src/osd/ReplicatedPG.cc
@@ -7169,7 +7169,8 @@ int ReplicatedPG::start_flush(
 		CEPH_OSD_COPY_FROM_FLAG_IGNORE_OVERLAY |
 		CEPH_OSD_COPY_FROM_FLAG_IGNORE_CACHE |
 		CEPH_OSD_COPY_FROM_FLAG_MAP_SNAP_CLONE,
-		0);
+		LIBRADOS_OP_FLAG_FADVISE_SEQUENTIAL|LIBRADOS_OP_FLAG_FADVISE_NOCACHE);
+
     //mean the base tier don't cache data after this
     if (agent_state && agent_state->evict_mode != TierAgentState::EVICT_MODE_FULL)
       o.set_last_op_flags(LIBRADOS_OP_FLAG_FADVISE_DONTNEED);