patch-2.1.53 linux/Documentation/powerpc/ppc_htab.txt

• Lines: 51
• Date: Thu Sep 4 12:54:48 1997
• Orig file: v2.1.52/linux/Documentation/powerpc/ppc_htab.txt
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.52/linux/Documentation/powerpc/ppc_htab.txt linux/Documentation/powerpc/ppc_htab.txt
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+                 Information about /proc/ppc_htab
+=====================================================================
+
+This entry in the proc directory is readable by all users but only
+writable by root.
+
+
+1. Reading
+
+  Reading this file will give you information about the memory management
+  hash table that serves as an extended tlb for page translation on the
+  powerpc.
+
+  Explaination of the fields:
+
+    Size - hash table size in Kb.
+    Buckets -  number of buckets in the table.
+    Addess - the virtual kernel address of the hash table base.
+    Entries - the number of ptes that can be stored in the hash table.
+    User/Kernel - how many pte's are in use by the kernel or user at that time.
+    Overflows - How many of the entries are in their secondary hash location.
+    Percent full - ratio of free pte entries to in use entries.
+
+  Note that calculation of the data displayed from /proc/ppc_htab takes
+  a long time and spends a great deal of time in the kernel.  It would
+  be quite hard on performance to read this file constantly.  In time
+  there may be a counter in the kernel that allows successive reads from
+  this file only after a given amount of time has passed to reduce the
+  possibility of a user slowing the system by reading this file.
+
+2. Writing
+
+  Writing to ppc_htab is not yet allowed.
+
+  Write options to ppc_htab:
+  
+   - To set the size of the hash table to 64Kb:
+
+      echo 'size 64' > /dev/ppc_htab
+
+     The size must be a multiple of 64 and must be greater than or equal to
+     64.
+
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