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Commit 15610c86 authored by Davidlohr Bueso's avatar Davidlohr Bueso Committed by Linus Torvalds
Browse files

hugepage: mention libhugetlbfs in doc 



Explicitly mention/recommend using the libhugetlbfs test cases when
changing related kernel code.  Developers that are unaware of the project
can easily miss this and introduce potential regressions that may or may
not be caught by community review.

Also do some cleanups that make the document visually easier to view at a
first glance.

Signed-off-by: default avatarDavidlohr Bueso <davidlohr@hp.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2cad4018

Documentation/vm/hugetlbpage.txt

+12 −13
Original line number Diff line number Diff line
@@ -165,6 +165,7 @@ which function as described above for the default huge page-sized case. 




Interaction of Task Memory Policy with Huge Page Allocation/Freeing

===================================================================



Whether huge pages are allocated and freed via the /proc interface or

the /sysfs interface using the nr_hugepages_mempolicy attribute, the NUMA
@@ -229,6 +230,7 @@ resulting effect on persistent huge page allocation is as follows: 
   of huge pages over all on-lines nodes with memory.



Per Node Hugepages Attributes

=============================



A subset of the contents of the root huge page control directory in sysfs,

described above, will be replicated under each the system device of each
@@ -258,6 +260,7 @@ applied, from which node the huge page allocation will be attempted. 




Using Huge Pages

================



If the user applications are going to request huge pages using mmap system

call, then it is required that system administrator mount a file system of
@@ -296,20 +299,16 @@ calls, though the mount of filesystem will be required for using mmap calls 
without MAP_HUGETLB.  For an example of how to use mmap with MAP_HUGETLB see

map_hugetlb.c.



*******************************************************************

Examples

========



/*

 * map_hugetlb: see tools/testing/selftests/vm/map_hugetlb.c

 */

1) map_hugetlb: see tools/testing/selftests/vm/map_hugetlb.c



*******************************************************************

2) hugepage-shm:  see tools/testing/selftests/vm/hugepage-shm.c



/*

 * hugepage-shm:  see tools/testing/selftests/vm/hugepage-shm.c

 */

3) hugepage-mmap:  see tools/testing/selftests/vm/hugepage-mmap.c



*******************************************************************



/*

 * hugepage-mmap:  see tools/testing/selftests/vm/hugepage-mmap.c

 */
 
4) The libhugetlbfs (http://libhugetlbfs.sourceforge.net) library provides a

   wide range of userspace tools to help with huge page usability, environment

   setup, and control. Furthermore it provides useful test cases that should be

   used when modifying code to ensure no regressions are introduced.