the configured hugepage size - this is needed for generating the proper
alignment and size of the arguments to the above system calls.
-The output of "cat /proc/meminfo" will have output like:
+The output of "cat /proc/meminfo" will have lines like:
.....
HugePages_Total: xxx
HugePages_Free: yyy
-Hugepagesize: zzz KB
+HugePages_Rsvd: www
+Hugepagesize: zzz kB
+
+where:
+HugePages_Total is the size of the pool of hugepages.
+HugePages_Free is the number of hugepages in the pool that are not yet
+allocated.
+HugePages_Rsvd is short for "reserved," and is the number of hugepages
+for which a commitment to allocate from the pool has been made, but no
+allocation has yet been made. It's vaguely analogous to overcommit.
/proc/filesystems should also show a filesystem of type "hugetlbfs" configured
in the kernel.
pre-configured) hugepages.
The allocation (or deallocation) of hugetlb pages is possible only if there are
enough physically contiguous free pages in system (freeing of hugepages is
-possible only if there are enough hugetlb pages free that can be transfered
+possible only if there are enough hugetlb pages free that can be transferred
back to regular memory pool).
-Pages that are used as hugetlb pages are reserved inside the kernel and can
-not be used for other purposes.
+Pages that are used as hugetlb pages are reserved inside the kernel and cannot
+be used for other purposes.
Once the kernel with Hugetlb page support is built and running, a user can
use either the mmap system call or shared memory system calls to start using
This command will try to configure 20 hugepages in the system. The success
or failure of allocation depends on the amount of physically contiguous
memory that is preset in system at this time. System administrators may want
-to put this command in one of the local rc init file. This will enable the
+to put this command in one of the local rc init files. This will enable the
kernel to request huge pages early in the boot process (when the possibility
of getting physical contiguous pages is still very high).
call, then it is required that system administrator mount a file system of
type hugetlbfs:
- mount none /mnt/huge -t hugetlbfs <uid=value> <gid=value> <mode=value>
- <size=value> <nr_inodes=value>
+ mount -t hugetlbfs \
+ -o uid=<value>,gid=<value>,mode=<value>,size=<value>,nr_inodes=<value> \
+ none /mnt/huge
This command mounts a (pseudo) filesystem of type hugetlbfs on the directory
/mnt/huge. Any files created on /mnt/huge uses hugepages. The uid and gid
mode of root of file system to value & 0777. This value is given in octal.
By default the value 0755 is picked. The size option sets the maximum value of
memory (huge pages) allowed for that filesystem (/mnt/huge). The size is
-rounded down to HPAGE_SIZE. The option nr_inode sets the maximum number of
-inodes that /mnt/huge can use. If the size or nr_inode options are not
+rounded down to HPAGE_SIZE. The option nr_inodes sets the maximum number of
+inodes that /mnt/huge can use. If the size or nr_inodes option is not
provided on command line then no limits are set. For size and nr_inodes
options, you can use [G|g]/[M|m]/[K|k] to represent giga/mega/kilo. For
-example, size=2K has the same meaning as size=2048. An example is given at
-the end of this document.
+example, size=2K has the same meaning as size=2048.
read and write system calls are not supported on files that reside on hugetlb
file systems.
-A regular chown, chgrp and chmod commands (with right permissions) could be
+Regular chown, chgrp, and chmod commands (with right permissions) could be
used to change the file attributes on hugetlbfs.
Also, it is important to note that no such mount command is required if the
wish to use hugetlb page via shared memory segment should be a member of
a supplementary group and system admin needs to configure that gid into
/proc/sys/vm/hugetlb_shm_group. It is possible for same or different
-applications to use any combination of mmaps and shm* calls. Though the
-mount of filesystem will be required for using mmaps.
+applications to use any combination of mmaps and shm* calls, though the
+mount of filesystem will be required for using mmap calls.
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git.samba.org / sfrench / cifs-2.6.git / blobdiff