video: sh7760fb: SH7760/SH7763 LCDC framebuffer driver

[linux-2.6] / Documentation / vm / hugetlbpage.txt

diff --git a/Documentation/vm/hugetlbpage.txt b/Documentation/vm/hugetlbpage.txt
index f962d01bea2a34efe494f83127ac957e8498dd99..8a5b5763f0fe9aa7df6c5f556ef8112e30bd70aa 100644 (file)
--- a/Documentation/vm/hugetlbpage.txt
+++ b/Documentation/vm/hugetlbpage.txt
@@ -88,14 +88,36 @@ hugepages from the buddy allocator, if the normal pool is exhausted. As
 these surplus hugepages go out of use, they are freed back to the buddy
 allocator.
 
-Caveat: Shrinking the pool via nr_hugepages while a surplus is in effect
-will allow the number of surplus huge pages to exceed the overcommit
-value, as the pool hugepages (which must have been in use for a surplus
-hugepages to be allocated) will become surplus hugepages.  As long as
+Caveat: Shrinking the pool via nr_hugepages such that it becomes less
+than the number of hugepages in use will convert the balance to surplus
+huge pages even if it would exceed the overcommit value.  As long as
 this condition holds, however, no more surplus huge pages will be
 allowed on the system until one of the two sysctls are increased
 sufficiently, or the surplus huge pages go out of use and are freed.
 
+With support for multiple hugepage pools at run-time available, much of
+the hugepage userspace interface has been duplicated in sysfs. The above
+information applies to the default hugepage size (which will be
+controlled by the proc interfaces for backwards compatibility). The root
+hugepage control directory is
+
+       /sys/kernel/mm/hugepages
+
+For each hugepage size supported by the running kernel, a subdirectory
+will exist, of the form
+
+       hugepages-${size}kB
+
+Inside each of these directories, the same set of files will exist:
+
+       nr_hugepages
+       nr_overcommit_hugepages
+       free_hugepages
+       resv_hugepages
+       surplus_hugepages
+
+which function as described above for the default hugepage-sized case.
+
 If the user applications are going to request hugepages using mmap system
 call, then it is required that system administrator mount a file system of
 type hugetlbfs: