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--- linux:kernel:huge_page_table [2020/07/15 09:30] – external edit 127.0.0.1
+++ linux:kernel:huge_page_table [2022/10/08 11:43] (current) – peter
@@ Line 1: / Line 1: @@
 ====== Kernel - Huge Page Table ======
-Here is a brief summary of **hugetlbpage** support in the Linux kernel.  This support is built on top of multiple page size support that is provided by most modern architectures.  For example, i386 architecture supports 4K and 4M (2M in PAE mode) page sizes, ia64 architecture supports multiple page sizes 4K, 8K, 64K, 256K, 1M, 4M, 16M, 256M and ppc64 supports 4K and 16M.  A TLB is a cache of virtual-to-physical translations.   Typically this is a very scarce resource on processor.
+Here is a brief summary of **hugetlbpage** support in the Linux kernel.
-Operating systems try to make best use of limited number of TLB resources.  This optimization is more critical now as bigger and bigger physical memories (several GBs) are more readily available.
+  * This support is built on top of multiple page size support that is provided by most modern architectures.
+  * For example, i386 architecture supports 4K and 4M (2M in PAE mode) page sizes, ia64 architecture supports multiple page sizes 4K, 8K, 64K, 256K, 1M, 4M, 16M, 256M and ppc64 supports 4K and 16M.
+  * A TLB is a cache of virtual-to-physical translations.
+  * Typically this is a very scarce resource on processor.
+Operating systems try to make best use of limited number of TLB resources.
+  * This optimization is more critical now as bigger and bigger physical memories (several GBs) are more readily available.
 Users can use the huge page support in Linux kernel by either using the **mmap** system call or standard SYSV shared memory system calls (shmget, shmat).
@@ Line 9: / Line 16: @@
 First the Linux kernel needs to be built with the **CONFIG_HUGETLBFS** (present under "File systems") and **CONFIG_HUGETLB_PAGE** (selected automatically when CONFIG_HUGETLBFS is selected) configuration options.
-The **/proc/meminfo** file provides information about the total number of persistent hugetlb pages in the kernel's huge page pool.  It also displays information about the number of free, reserved and surplus huge pages and the default huge page size.  The huge page size is needed for generating the proper alignment and size of the arguments to system calls that map huge page regions.
+The **/proc/meminfo** file provides information about the total number of persistent hugetlb pages in the kernel's huge page pool.
+  * It also displays information about the number of free, reserved and surplus huge pages and the default huge page size.
+  * The huge page size is needed for generating the proper alignment and size of the arguments to system calls that map huge page regions.
 The output of "cat /proc/meminfo" will include lines like: