From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38854) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YzSHY-0003j1-Ch for qemu-devel@nongnu.org; Mon, 01 Jun 2015 12:09:49 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YzSHS-0005h6-Vu for qemu-devel@nongnu.org; Mon, 01 Jun 2015 12:09:44 -0400 From: Max Reitz Date: Mon, 1 Jun 2015 18:09:18 +0200 Message-Id: <1433174959-7176-3-git-send-email-mreitz@redhat.com> In-Reply-To: <1433174959-7176-1-git-send-email-mreitz@redhat.com> References: <1433174959-7176-1-git-send-email-mreitz@redhat.com> Subject: [Qemu-devel] [PATCH 2/3] iotests: qcow2 COW with minimal L2 cache size List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-block@nongnu.org Cc: Kevin Wolf , Max Reitz , Alberto Garcia , qemu-devel@nongnu.org, Alexander Graf This adds a test case to test 103 for performing a COW operation in a qcow2 image using an L2 cache with minimal size (which should be at least two clusters so the COW can access both source and destination simultaneously). Signed-off-by: Max Reitz --- tests/qemu-iotests/103 | 10 ++++++++++ tests/qemu-iotests/103.out | 5 +++++ 2 files changed, 15 insertions(+) diff --git a/tests/qemu-iotests/103 b/tests/qemu-iotests/103 index ccab551..fa9a3c1 100755 --- a/tests/qemu-iotests/103 +++ b/tests/qemu-iotests/103 @@ -93,6 +93,16 @@ $QEMU_IO -c "open -o l2-cache-size=1M,refcount-cache-size=0.25M $TEST_IMG" \ -c 'read -P 42 0 64k' \ | _filter_qemu_io +echo +echo '=== Testing minimal L2 cache and COW ===' +echo + +$QEMU_IMG snapshot -c foo "$TEST_IMG" +# This requires a COW operation, which accesses two L2 tables simultaneously +# (COW source and destination), so there must be enough space in the cache to +# place both tables there (and qemu should not crash) +$QEMU_IO -c "open -o cache-size=0 $TEST_IMG" -c 'write 0 64k' | _filter_qemu_io + # success, all done echo '*** done' rm -f $seq.full diff --git a/tests/qemu-iotests/103.out b/tests/qemu-iotests/103.out index ee705b0..d05f49f 100644 --- a/tests/qemu-iotests/103.out +++ b/tests/qemu-iotests/103.out @@ -26,4 +26,9 @@ read 65536/65536 bytes at offset 0 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) read 65536/65536 bytes at offset 0 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) + +=== Testing minimal L2 cache and COW === + +wrote 65536/65536 bytes at offset 0 +64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) *** done -- 2.4.1