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8236595: Add more comments about how to setup simulated NVRAM before run java/nio/MappedByteBuffer/PmemTest.java

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Reviewed-by: alanb, adinn
This commit is contained in:
Chris Yin 2020-01-06 11:29:38 +08:00
parent 0a9a7e2f6c
commit 6da7ea6ea3
1 changed files with 13 additions and 3 deletions
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16
test/jdk/java/nio/MappedByteBuffer/PmemTest.java
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@ -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