benchtests: Memory walking benchmark for memcpy

This benchmark is an attempt to eliminate cache effects from string
benchmarks.  The benchmark walks both ways through a large memory area
and copies different sizes of memory and alignments one at a time
instead of looping around in the same memory area.  This is a good
metric to have alongside the other memcpy benchmarks, especially for
larger sizes where the likelihood of the call being done only once is
pretty high.

	* benchtests/bench-memcpy-walk.c: New file.
	* benchtests/Makefile (string-benchset): Add it.

1 files changed, 5 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 7ddff74272..a86faeb792 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2017-10-05  Siddhesh Poyarekar  <siddhesh@sourceware.org>
+
+	* benchtests/bench-memcpy-walk.c: New file.
+	* benchtests/Makefile (string-benchset): Add it.
+
 2017-10-05  Florian Weimer  <fweimer@redhat.com>
 
 	nscd: Eliminate compilation time dependency in the build output.