From: Darrick J. Wong <djwong@xxxxxxxxxx> We have a handful of users who continually ping the maintainer with questions about why pmem and dax don't work quite the way they want (which is to say 2MB extents and PMD mappings) because they copy-pasted some garbage from Google that's wrong. Encode the correct defaults into a mkfs config file and ship that. Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx> --- mkfs/Makefile | 1 + mkfs/dax_x86_64.conf | 19 +++++++++++++++++++ 2 files changed, 20 insertions(+) create mode 100644 mkfs/dax_x86_64.conf diff --git a/mkfs/Makefile b/mkfs/Makefile index 0aaf9d06..55d9362f 100644 --- a/mkfs/Makefile +++ b/mkfs/Makefile @@ -10,6 +10,7 @@ LTCOMMAND = mkfs.xfs HFILES = CFILES = proto.c xfs_mkfs.c CFGFILES = \ + dax_x86_64.conf \ lts_4.19.conf \ lts_5.4.conf \ lts_5.10.conf \ diff --git a/mkfs/dax_x86_64.conf b/mkfs/dax_x86_64.conf new file mode 100644 index 00000000..bc3f3c9a --- /dev/null +++ b/mkfs/dax_x86_64.conf @@ -0,0 +1,19 @@ +# mkfs.xfs configuration file for persistent memory on x86_64. +# Block size must match page size (4K) and we require V5 for the DAX inode +# flag. Set extent size hints and stripe units to encourage the filesystem to +# allocate PMD sized (2MB) blocks. + +[block] +size=4096 + +[metadata] +crc=1 + +[data] +sunit=4096 +swidth=4096 +extszinherit=512 +daxinherit=1 + +[realtime] +extsize=2097152
