2 files changed, 43 insertions, 1 deletions

diff --git a/meta-oe/recipes-benchmark/sysbench/sysbench/0001-Adding-volatile-modifier-to-tmp-variable-in-memory-t.patch b/meta-oe/recipes-benchmark/sysbench/sysbench/0001-Adding-volatile-modifier-to-tmp-variable-in-memory-t.patch
new file mode 100644
index 0000000000..d628e81b56
--- /dev/null
+++ b/meta-oe/recipes-benchmark/sysbench/sysbench/0001-Adding-volatile-modifier-to-tmp-variable-in-memory-t.patch
@@ -0,0 +1,40 @@
+From c1ebf893e32a0a77e820484d48a903523fef7c1b Mon Sep 17 00:00:00 2001
+From: Vasily Tarasov <tarasov@vasily.name>
+Date: Fri, 10 Jun 2016 14:33:48 -0400
+Subject: [PATCH] Adding volatile modifier to tmp variable in memory test
+
+Issue explanation:
+
+./sysbench/sysbench --test=memory --num-threads=16 \
+                    --memory-block-size=268435456 \
+                    --memory-total-size=137438953472 \
+                    --memory-oper=read \
+                    --memory-access-mode=seq \
+                    --memory-scope=local run
+
+Without this commit the time to run the above command is 0.0004 seconds.
+With this commit the time is greater than 3 seconds.  Essentially,
+without the volatile modifier, the compiler optimizes read access so
+that no real access happens.
+
+Upstream-Status: Backport [part of v1.0.0 https://github.com/akopytov/sysbench/commit/8753cb93be4c0b81a20b704ced91e7a422da52b1]
+
+(cherry picked from commit 8753cb93be4c0b81a20b704ced91e7a422da52b1)
+Signed-off-by: massimo toscanelli <massimo.toscanelli@leica-geosystems.com>
+---
+ sysbench/tests/memory/sb_memory.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/sysbench/tests/memory/sb_memory.c b/sysbench/tests/memory/sb_memory.c
+index 2e8998f..7d22bb9 100644
+--- a/sysbench/tests/memory/sb_memory.c
++++ b/sysbench/tests/memory/sb_memory.c
+@@ -244,7 +244,7 @@ sb_request_t memory_get_request(int tid)
+ int memory_execute_request(sb_request_t *sb_req, int thread_id)
+ {
+   sb_mem_request_t    *mem_req = &sb_req->u.mem_request;
+-  int                 tmp = 0;
++  volatile int        tmp = 0;
+   int                 idx; 
+   int                 *buf, *end;
+   log_msg_t           msg;
diff --git a/meta-oe/recipes-benchmark/sysbench/sysbench_0.4.12.bb b/meta-oe/recipes-benchmark/sysbench/sysbench_0.4.12.bb
index 708c71f4ff..d1725dddd6 100644
--- a/meta-oe/recipes-benchmark/sysbench/sysbench_0.4.12.bb
+++ b/meta-oe/recipes-benchmark/sysbench/sysbench_0.4.12.bb
@@ -8,7 +8,9 @@ inherit autotools
 
 # The project has moved from Sourceforge to Launchpad, to Github. Use the source tarball from
 # Launchpad until the next release is available from Github.
-SRC_URI = "https://launchpad.net/ubuntu/+archive/primary/+files/${BPN}_${PV}.orig.tar.gz"
+SRC_URI = "https://launchpad.net/ubuntu/+archive/primary/+files/${BPN}_${PV}.orig.tar.gz \
+           file://0001-Adding-volatile-modifier-to-tmp-variable-in-memory-t.patch \
+           "
 
 SRC_URI[md5sum] = "3a6d54fdd3fe002328e4458206392b9d"
 SRC_URI[sha256sum] = "83fa7464193e012c91254e595a89894d8e35b4a38324b52a5974777e3823ea9e"