OpenJDK / jdk / jdk
changeset 57539:3782f2958116
8236595: Add more comments about how to setup simulated NVRAM before run java/nio/MappedByteBuffer/PmemTest.java
Reviewed-by: alanb, adinn
| author | xyin |
|---|---|
| date | Mon, 06 Jan 2020 11:29:38 +0800 |
| parents | 319384c70400 |
| children | b9d1ce20dd4b |
| files | test/jdk/java/nio/MappedByteBuffer/PmemTest.java |
| diffstat | 1 files changed, 13 insertions(+), 3 deletions(-) [+] |
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--- a/test/jdk/java/nio/MappedByteBuffer/PmemTest.java Sat Jan 04 16:25:58 2020 +0900 +++ b/test/jdk/java/nio/MappedByteBuffer/PmemTest.java Mon Jan 06 11:29:38 2020 +0800 @@ -50,10 +50,20 @@ * * https://developers.redhat.com/blog/2016/12/05/configuring-and-using-persistent-memory-rhel-7-3/ * https://nvdimm.wiki.kernel.org/ - * TL;DR: add "memmap=1G!4G" to /etc/default/grub, - * then grub2-mkconfig -o /boot/grub2/grub.cfg and reboot + * TL;DR: add "memmap=1G!4G" to /etc/default/grub, eg. GRUB_CMDLINE_LINUX="memmap=1G!4G" + * then ("sudo" may required) + * for RHEL(BIOS-based): grub2-mkconfig -o /boot/grub2/grub.cfg + * for RHEL(UEFI-based): grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg + * for Ubuntu: update-grub2 + * finally reboot + * after the host been rebooted, a new /dev/pmem{N} device should exist, + * naming conversion starts at /dev/pmem0 * - * ndctl create-namespace * -f -e namespace0.0 -m memory -M mem + * Prepare test directory follow below commands, "sudo" may required + * (if ndctl or mkfs.xfs not exist, install ndctl or xfsprogs package first) + * (for RHEL8, when call mkfs.xfs, specify the -m reflink=0 option to disable reflink feature) + * + * ndctl create-namespace -f -e namespace0.0 -m memory -M mem * mkdir /mnt/pmem * mkfs.xfs -f /dev/pmem0; mount -o dax /dev/pmem0 /mnt/pmem/ * mkdir /mnt/pmem/test; chmod a+rwx /mnt/pmem/test