[Cluster-devel] [PATCH] cman init: allow dlm hash table sizes to be tunable at startup

[Fabio M. Di Nitto <fdinitto@redhat.com>]

From: "Fabio M. Di Nitto" <fdinitto@redhat.com>

Resolves: rhbz#842370

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
---
 cman/init.d/cman.in               |   28 ++++++++++++++++++++++++++++
 cman/init.d/cman.init.defaults.in |    7 +++++++
 2 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/cman/init.d/cman.in b/cman/init.d/cman.in
index 9a0d726..9de349d 100644
--- a/cman/init.d/cman.in
+++ b/cman/init.d/cman.in
@@ -110,6 +110,13 @@ fi
 # DLM_CONTROLD_OPTS -- allow extra options to be passed to dlm_controld daemon.
 [ -z "$DLM_CONTROLD_OPTS" ] && DLM_CONTROLD_OPTS=""
 
+# DLM_LKBTBL_SIZE - DLM_RSBTBL_SIZE - DLM_DIRTBL_SIZE
+# Allow tuning of DLM kernel hash table sizes.
+# do NOT change unless instructed to do so.
+[ -z "$DLM_LKBTBL_SIZE" ] && DLM_LKBTBL_SIZE=""
+[ -z "$DLM_RSBTBL_SIZE" ] && DLM_RSBTBL_SIZE=""
+[ -z "$DLM_DIRTBL_SIZE" ] && DLM_DIRTBL_SIZE=""
+
 # FENCE_JOIN_TIMEOUT -- seconds to wait for fence domain join to
 #     complete.  If the join hasn't completed in this time, fence_tool join
 #     exits with an error, and this script exits with an error.  To wait
@@ -706,6 +713,23 @@ leave_fence_domain()
 	fi
 }
 
+tune_dlm_hash_sizes()
+{
+	dlmdir="/sys/kernel/config/dlm/cluster"
+
+	[ -n "$DLM_LKBTBL_SIZE" ] && [ -f $dlmdir/lkbtbl_size ] && \
+	  echo $DLM_LKBTBL_SIZE > $dlmdir/lkbtbl_size
+
+	[ -n "$DLM_RSBTBL_SIZE" ] && [ -f $dlmdir/rsbtbl_size ] && \
+	  echo $DLM_RSBTBL_SIZE > $dlmdir/rsbtbl_size
+
+	[ -n "$DLM_DIRTBL_SIZE" ] && [ -f $dlmdir/dirtbl_size ] && \
+	  echo $DLM_DIRTBL_SIZE > $dlmdir/dirtbl_size
+
+	return 0
+}
+	
+
 start()
 {
 	currentaction="start"
@@ -773,6 +797,10 @@ start()
 		none \
 		"Starting dlm_controld"
 
+	runwrap tune_dlm_hash_sizes \
+		none \
+		"Tuning DLM kernel hash tables"
+
 	runwrap start_gfs_controld \
 		none \
 		"Starting gfs_controld"
diff --git a/cman/init.d/cman.init.defaults.in b/cman/init.d/cman.init.defaults.in
index 1b7913e..bbaa049 100644
--- a/cman/init.d/cman.init.defaults.in
+++ b/cman/init.d/cman.init.defaults.in
@@ -34,6 +34,13 @@
 # DLM_CONTROLD_OPTS -- allow extra options to be passed to dlm_controld daemon.
 #DLM_CONTROLD_OPTS=""
 
+# DLM_LKBTBL_SIZE - DLM_RSBTBL_SIZE - DLM_DIRTBL_SIZE
+# Allow tuning of DLM kernel hash table sizes.
+# do NOT change unless instructed to do so.
+#DLM_LKBTBL_SIZE=""
+#DLM_RSBTBL_SIZE=""
+#DLM_DIRTBL_SIZE=""
+
 # FENCE_JOIN_TIMEOUT -- seconds to wait for fence domain join to
 #     complete.  If the join hasn't completed in this time, fence_tool join
 #     exits with an error, and this script exits with an error.  To wait
-- 
1.7.7.6